Updated on 2026/05/06

写真a

 
MORIKAWA JUNKO
 
Organization
School of Materials and Chemical Technology Professor
Title
Professor
External link

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Research Interests

  • Thermophysical Properties, Thermal Analysis, Polymer, Instrumentation, Soft materials

Research Areas

  • Nanotechnology/Materials / Polymer materials

Papers

  • Anisotropy Analysis of Bamboo and Tooth Using 4‐Angle Polarization Micro‐Spectroscopy

    Meguya Ryu, Hsin‐Hui Huang, Jitraporn Vongsvivut, Soon Hock Ng, Irma Dumbrytė, Donatas Narbutis, Mangirdas Malinauskas, Saulius Juodkazis, Junko Morikawa

    Nano Select   2025.12

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    ABSTRACT

    To investigate the anisotropic properties of biomaterials, two distinct classes are considered as follows: polymer‐based (cellulose in plants) and crystalline‐based (enamel in teeth), each demonstrating distinct structural and functional characteristics. Four‐angle polarization spectral mapping of sub‐1‐ bamboo slices was carried out in the mid‐IR spectral range (2.5–20 ) to reveal the 3D organization of the chemical bonding of cellulose using the key characteristic absorption bands associated with C–O–C and C–N vibrational modes. The longitudinal and transverse microtome slices revealed a switch between the presence and absence of dichroism in parenchyma cell walls and vascular bundles. The cell wall showed continuous alignment of the C–O–C stretching vibrational mode (8.6 /1163 ) down to the pixel resolution of in the transverse slice; the cell wall thickness is . Thin microtomed slices of a tooth were measured in transmission and reflection modes. The single‐point reflection measurements, performed using two perpendicular orientations, revealed orientational anisotropy in the enamel, which was absent in the dentin region. High subdiffraction lateral resolution was numerically validated using a simplified toy model of a Gaussian beam. The model showed that the orientation of small absorbers can be revealed using a focal spot of .

    DOI： 10.1002/nano.70099

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  • Bridging spectroscopy and advanced molecular orientation analysis with new 4＋ angle polarization toolbox in Quasar Reviewed International coauthorship International journal

    Callum Gassner, Jitraporn Vongsvivut, Meguya Ryu, Soon Hock Ng, Marko Toplak, Vijayakumar Anand, Pooja Takkalkar, Mary Louise Fac, Natalie A. Sims, Bayden R. Wood, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa

    Computers in Biology and Medicine   196   110573 - 110573   2025.9

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.compbiomed.2025.110573

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  • Alignment-assisted high thermal conductivity and thermal anisotropy in poly(methyl methacrylate)/graphene nanolaminates Reviewed International coauthorship International journal

    Bohai Liu, Christos Pavlou, Meguya Ryu, Ayumi Ishihara, Jizhu Hu, Costas Galiotis, Junko Morikawa, Xiangfan Xu, George Fytas

    Physical Review Applied   2025.7

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/5zfl-986l

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  • Discovery of liquid crystalline polymers with high thermal conductivity using machine learning Reviewed International coauthorship International journal

    Hayato Maeda, Stephen Wu, Rika Marui, Erina Yoshida, Kan Hatakeyama-Sato, Yuta Nabae, Shiori Nakagawa, Meguya Ryu, Ryohei Ishige, Yoh Noguchi, Yoshihiro Hayashi, Masashi Ishii, Isao Kuwajima, Felix Jiang, Xuan Thang Vu, Sven Ingebrandt, Masatoshi Tokita, Junko Morikawa, Ryo Yoshida, Teruaki Hayakawa

    npj Computational Materials   11 ( 1 )   2025.7

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Next-generation power electronics require efficient heat dissipation management, and molecular design guidelines are needed to develop polymers with high thermal conductivity. Polymer materials have considerably lower thermal conductivity than metals and ceramics due to phonon scattering in the amorphous region. The spontaneous orientation of the molecular chains of liquid crystalline polymers could potentially give rise to high thermal conductivity, but the molecular design of such polymers remains largely empirical. In this study, we developed a machine learning model that predicts with more than 96% accuracy whether liquid crystalline states will form based on the chemical structure of the polymer. By exploring the inverse mapping of this model, we identified a comprehensive set of chemical structures for liquid crystalline polyimides. The polymers were then experimentally synthesized, and the results confirmed that they form liquid crystalline phases, with all polymers exhibiting calculated thermal conductivities within the range of 0.722–1.26 W m−1 K−1.

    DOI： 10.1038/s41524-025-01671-w

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    Other Link： https://www.nature.com/articles/s41524-025-01671-w

  • Smectic liquid crystalline poly(ester imide)s with low dielectric dissipation factors for high-frequency applications Reviewed International coauthorship International journal

    Hayato Maeda, Yucheng Liang, Ryohei Hosoya, Rika Marui, Erina Yoshida, Yuqian Chen, Kan Hatakeyama-Sato, Yuta Nabae, Shiori Nakagawa, Junko Morikawa, Masatoshi Tokita, Ririka Sawada, Shinji Ando, Yoshihiro Hayashi, Ryo Yoshida, Hidemine Furuya, Teruaki Hayakawa

    Polymer Journal   2025.6

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41428-025-01020-0

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  • Control of Heat Flow in a Soft Matter: Anisotropic Heat Transport in a Discotic Columnar Liquid Crystal Capable of Reversible Alignment Switching Reviewed International journal

    Meguya Ryu, Ryosuke Takehara, Shuji Kamegaki, Hiromichi Yokoyama, Takashi Kajitani, Junko Morikawa, Takanori Fukushima

    The Journal of Physical Chemistry Letters   2025.4

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpclett.5c00354

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  • Detection of dynamic temperature modulation using a thermal scanning probe lithography (t-SPL) system Reviewed International coauthorship International journal

    M. Ryu, F. Könemann, S. Kamegaki, C. van Nisselroy, K. Buddha, E. Cagin, J. Morikawa

    Review of Scientific Instruments   2025.4

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/5.0245701

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  • A numerical study on Carnot Battery using chemical heat storage/pump and brayton cycle Reviewed

    7   267   2025.3

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  • Investigation of anisotropy in the collective dynamics and thermal diffusivity in the phenyl pyrimidine liquid crystal Reviewed International journal

    Meguya Ryu, Shu-hei Kurose, Koji Yoshida, Hiroshi Uchiyama, Junko Morikawa

    Physical Review E   2025.1

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevE.111.015432

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  • Covalent Bonds versus van der Waals Forces: A Picture in Thermal Conduction of Organic Materials Reviewed International journal

    Ryosuke Takehara, Tomoya Fukui, Taketo Tano, Meguya Ryu, Suguru Kitani, Hitoshi Kawaji, Junko Morikawa, Takanori Fukushima

    Journal of the American Chemical Society   2024.10

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.4c11849

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  • Interferometric microscale measurement of refractive index at VIS and IR wavelengths Reviewed International coauthorship International journal

    Meguya Ryu, Simonas Varapnickas, Darius Gailevicius, Domas Paipulas, Eulalia Puig Vilardell, Zahra Khajehsaeidimahabadi, Saulius Juodkazis, Junko Morikawa, Mangirdas Malinauskas

    SciPost Physics Core   7 ( 3 )   2024.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Stichting SciPost  

    Determination of refractive index of micro-disks of a calcinated (1100^\circC in air) photo-resist SZ2080^\mathrm{TM} was carried out using transmission and reflection spectroscopy. Interference fringes at specific wavenumbers/wavelengths were selected for determination of the optical thickness, hence, the refractive index when the thickness of micro-disks was measured by scanning electron microscopy (SEM). Refractive index of disks of \sim 6± 1~\mum thickness were determined at visible and IR (2.5-13~\mum) spectral ranges and where 2.2± 0.2 at visible and IR wavelengths. Peculiarities of optical characterisation of micro-optical structures are discussed in view of possible uncertainties in the definition of geometric parameters, shape and mass density redistribution.

    DOI： 10.21468/scipostphyscore.7.3.059

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  • Roadmap on computational methods in optical imaging and holography [invited] Invited Reviewed International coauthorship International journal

    Joseph Rosen, Simon Alford, Blake Allan, Vijayakumar Anand, Shlomi Arnon, Francis Gracy Arockiaraj, Jonathan Art, Bijie Bai, Ganesh M. Balasubramaniam, Tobias Birnbaum, Nandan S. Bisht, David Blinder, Liangcai Cao, Qian Chen, Ziyang Chen, Vishesh Dubey, Karen Egiazarian, Mert Ercan, Andrew Forbes, G. Gopakumar, Yunhui Gao, Sylvain Gigan, Paweł Gocłowski, Shivasubramanian Gopinath, Alon Greenbaum, Ryoichi Horisaki, Daniel Ierodiaconou, Saulius Juodkazis, Tanushree Karmakar, Vladimir Katkovnik, Svetlana N. Khonina, Peter Kner, Vladislav Kravets, Ravi Kumar, Yingming Lai, Chen Li, Jiaji Li, Shaoheng Li, Yuzhu Li, Jinyang Liang, Gokul Manavalan, Aditya Chandra Mandal, Manisha Manisha, Christopher Mann, Marcin J. Marzejon, Chané Moodley, Junko Morikawa, Inbarasan Muniraj, Donatas Narbutis, Soon Hock Ng, Fazilah Nothlawala, Jeonghun Oh, Aydogan Ozcan, YongKeun Park, Alexey P. Porfirev, Mariana Potcoava, Shashi Prabhakar, Jixiong Pu, Mani Ratnam Rai, Mikołaj Rogalski, Meguya Ryu, Sakshi Choudhary, Gangi Reddy Salla, Peter Schelkens, Sarp Feykun Şener, Igor Shevkunov, Tomoyoshi Shimobaba, Rakesh K. Singh, Ravindra P. Singh, Adrian Stern, Jiasong Sun, Shun Zhou, Chao Zuo, Zack Zurawski, Tatsuki Tahara, Vipin Tiwari, Maciej Trusiak, R. V. Vinu, Sergey G. Volotovskiy, Hasan Yılmaz, Hilton Barbosa De Aguiar, Balpreet S. Ahluwalia, Azeem Ahmad

    Applied Physics B   130 ( 9 )   2024.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Computational methods have been established as cornerstones in optical imaging and holography in recent years. Every year, the dependence of optical imaging and holography on computational methods is increasing significantly to the extent that optical methods and components are being completely and efficiently replaced with computational methods at low cost. This roadmap reviews the current scenario in four major areas namely incoherent digital holography, quantitative phase imaging, imaging through scattering layers, and super-resolution imaging. In addition to registering the perspectives of the modern-day architects of the above research areas, the roadmap also reports some of the latest studies on the topic. Computational codes and pseudocodes are presented for computational methods in a plug-and-play fashion for readers to not only read and understand but also practice the latest algorithms with their data. We believe that this roadmap will be a valuable tool for analyzing the current trends in computational methods to predict and prepare the future of computational methods in optical imaging and holography.

    DOI： 10.1007/s00340-024-08280-3

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    Other Link： https://link.springer.com/article/10.1007/s00340-024-08280-3/fulltext.html

  • Polarimeters for the Detection of Anisotropy from Reflectance Reviewed International coauthorship International journal

    Shuji Kamegaki, Zahra Khajehsaeidimahabadi, Meguya Ryu, Nguyen Hoai An Le, Soon Hock Ng, Ričardas Buividas, Gediminas Seniutinas, Vijayakumar Anand, Saulius Juodkazis, Junko Morikawa

    Micromachines   15 ( 6 )   794 - 794   2024.6

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    Polarimetry is used to determine the Stokes parameters of a laser beam. Once all four S0,1,2,3 parameters are determined, the state of polarisation is established. Upon reflection of a laser beam with the defined S polarisation state, the directly measured S parameters can be used to determine the optical properties of the surface, which modify the S-state upon reflection. Here, we use polarimetry for the determination of surface anisotropies related to the birefringence and dichroism of different materials, which have a common feature of linear patterns with different alignments and scales. It is shown that polarimetry in the back-reflected light is complementary to ellipsometry and four-polarisation camera imaging; experiments were carried out using a microscope.

    DOI： 10.3390/mi15060794

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  • Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity Reviewed International coauthorship International journal

    Paolo Bison, Giovanni Ferrarini, Christ Glorieux, Junko Morikawa, Nicolò Morselli, Shuji Kamegaki, Stefano Rossi, Meguya Ryu

    Thermosense: Thermal Infrared Applications XLVI   24 - 24   2024.6

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.3014081

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  • Broad-Wavelength Light-Fuelled Organic Crystal Oscillators Driven by Multimodal Photothermally Resonated Natural Vibration Reviewed International journal

    Hideko Koshima, Shodai Hasebe, Yuki Hagiwara, Taiki Goto, Tomohiro Ryu, Takumi Ehara, Tomohiro Ogawa, Kiyoshi Miyata, Ken Onda, Ryota Morioka, Junko Morikawa, Toru Asahi

    2024.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Research Square Platform LLC  

    Abstract<p>Photomechanical crystals have applications in light-fuelled actuators and soft robots. Herein, we describe light-responsive, versatile, anthraquinone dye crystal oscillators actuated via natural vibrations that are resonated by a photothermal effect. A black needle-shaped crystal cantilever oscillates at 70 Hz in the first mode of natural vibration upon irradiation by broad-wavelength light ranging from the ultraviolet through the visible to the near infrared, and also under continuous-wavelength light (400–2000 nm). The second and third natural vibration modes are induced at higher frequencies (530 and 1350 Hz) and evidence complex flagellum-like motions. The frequency can be readily tuned by moving the support of a crystal piece; this is analogous to playing a guitar. The crystal exhibits high durability (more than 10,000 cycles): the high elasticity prevents deterioration. Oscillatory motions can be designed via simulations using finite element analysis. This work will facilitate the use of photomechanical crystals in light-fuelled soft robots.</p>

    DOI： 10.21203/rs.3.rs-4302535/v1

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    Other Link： https://www.researchsquare.com/article/rs-4302535/v1.html

  • Determination of Stokes Vector from a Single Image Acquisition Reviewed International coauthorship International journal

    Shuji Kamegaki, Meguya Ryu, Soon Hock Ng, Vygantas Mizeikis, Sean J. Blamires, Saulius Juodkazis, Junko Morikawa

    Annalen der Physik   536 ( 6 )   2024.1

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    Abstract

    Four Stokes parameters (1852) define the polarization state of light. Measured changes of the Stokes vector of light traversing an inhomogeneous sample are linked to the local anisotropies of absorption and refraction and are harnessed over an increasing range of applications in photonics, material, and space/earth observation. Several independent polarization sensitive measurements are usually required for determination of the all four Stokes parameters, which makes such characterization procedure time‐consuming or requires complex setups. Here, a single‐snapshot approach to Stokes polarimetry in transmission is introduced by use of a four‐polarization camera with the on‐chip integrated polarizers. A quarter‐waveplate is added in front of the sample and is illuminated by a linearly polarized light. This approach is demonstrated by measuring birefringence of spider silk of only m‐diameter using microscopy, however, due to its generic nature, it is transferable to other spectral ranges and imaging applications, e.g., imaging from a fast moving satellite or drone or monitoring fast changing events such as phase transitions.

    DOI： 10.1002/andp.202300471

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  • Train Pulses with a Random Spatial Distribution to Measure In-Plane Thermal Diffusivity

    Paolo Bison, giovanni ferrarini, Christ Glorieux, Shuji Kamegaki, Junko Morikawa, STEFANO ROSSI, Meguya Ryu

    Engineering Proceedings   2023.11

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/engproc2023051039

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  • Structural and Thermal Diffusivity Analysis of an Organoferroelastic Crystal Showing Scissor-Like Two-Directional Deformation Induced by Uniaxial Compression

    Subham Ranjan, Meguya Ryu, Ryota Morioka, Shuji Kamegaki, Soon Hock Ng, Daniel Smith, Jitraporn Vongsvivut, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa, Satoshi Takamizawa

    Journal of the American Chemical Society   2023.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.3c05545

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  • Insights into Thermal Transport through Molecular π-Stacking

    Ryosuke Takehara, Natsuki Kubo, Meguya Ryu, Suguru Kitani, Shusaku Imajo, Yoshiaki Shoji, Hitoshi Kawaji, Junko Morikawa, Takanori Fukushima

    Journal of the American Chemical Society   145 ( 40 )   22115 - 22121   2023.9

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.3c07921

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  • Lock-in photothermal method for in-plane thermal diffusivity measurements using arrayed temperature sensors on suspended SiNx membranes

    Felix Jiang, Meguya Ryu, Vivek Pachauri, Sven Ingebrandt, Xuan Thang Vu, Junko Morikawa

    Review of Scientific Instruments   2023.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/5.0160602

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  • Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine

    Shuji Kamegaki, DANIEL SMITH, Meguya Ryu, Soon Hock Ng, Hsin-hui Huang, Pegah Maasoumi, Jitraporn Vongsvivut, Daniel Moraru, Tomas Katkus, Saulius Juodkazis, Junko Morikawa

    Coatings   2023.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/coatings13091640

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  • Linearly Polarized Infrared Spectroscopy for the Analysis of Biological Materials

    Callum Gassner, Jitraporn Vongsvivut, Soon Hock Ng, Meguya Ryu, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa, Bayden R. Wood

    Applied Spectroscopy   77 ( 9 )   977 - 1008   2023.7

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    Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

    The analysis of biological samples with polarized infrared spectroscopy (p-IR) has long been a widely practiced method for the determination of sample orientation and structural properties. In contrast to earlier works, which employed this method to investigate the fundamental chemistry of biological systems, recent interests are moving toward “real-world” applications for the evaluation and diagnosis of pathological states. This focal point review provides an up-to-date synopsis of the knowledge of biological materials garnered through linearly p-IR on biomolecules, cells, and tissues. An overview of the theory with special consideration to biological samples is provided. Different modalities which can be employed along with their capabilities and limitations are outlined. Furthermore, an in-depth discussion of factors regarding sample preparation, sample properties, and instrumentation, which can affect p-IR analysis is provided. Additionally, attention is drawn to the potential impacts of analysis of biological samples with inherently polarized light sources, such as synchrotron light and quantum cascade lasers. The vast applications of p-IR for the determination of the structure and orientation of biological samples are given. In conclusion, with considerations to emerging instrumentation, findings by other techniques, and the shift of focus toward clinical applications, we speculate on the future directions of this methodology.

    DOI： 10.1177/00037028231180233

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    Other Link： http://journals.sagepub.com/doi/full-xml/10.1177/00037028231180233

  • An Inhibition Effect on an Intracrystalline Reaction by a Crystal Lattice: Analyses of the Chemiluminescence Reaction of 9,10-Diphenylanthracene Endoperoxide Initiated by Heating of a Crystal Sample

    Norihisa Yamasaki, Chihiro Matsuhashi, Hironaga Oyama, Hidehiro Uekusa, Junko Morikawa, Meguya Ryu, Tetsuya Tsujii, Naofumi Nakayama, Shigeaki Obata, Hitoshi Goto, Shojiro Maki, Takashi Hirano

    Bulletin of the Chemical Society of Japan   2023.7

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    Publishing type：Research paper (scientific journal)   Publisher：The Chemical Society of Japan  

    DOI： 10.1246/bcsj.20230121

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  • Structure and Optical Anisotropy of Spider Scales and Silk: Use of Chromaticity and Azimuth Colors

    Denver P Linklater, Arturas Vailionis, Meguya Ryu, Shuji Kamegaki, Junko Morikawa, Haoran Mu, Daniel Smith, Pegah Maasoumi, Rohan Ford, Tomas Katkus, Sean Blamires, Toshiaki Kondo, Yoshiaki Nishijima, Daniel Moraru, Michael Shribak, Andrea O’Connor, Elena Ivanova, Soon Ng, Masuda Hideki, Saulius Juodkazis

    2023.5

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  • Photothermally induced natural vibration for versatile and high-speed actuation of crystals Reviewed

    Yuki Hagiwara, Shodai Hasebe, Hiroki Fujisawa, Junko Morikawa, Toru Asahi, Hideko Koshima

    Nature Communications   14 ( 1 )   2023.3

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The flourishing field of soft robotics requires versatile actuation methodology. Natural vibration is a physical phenomenon that can occur in any material. Here, we report high-speed bending of anisole crystals by natural vibration induced by the photothermal effect. Rod-shaped crystal cantilevers undergo small, fast repetitive bending (~0.2°) due to natural vibration accompanied by large photothermal bending (~1°) under ultraviolet light irradiation. The natural vibration is greatly amplified by resonance upon pulsed light irradiation at the natural frequency to realise high frequency (~700 Hz), large bending (~4°), and high energy conversion efficiency from light to mechanical energy. The natural vibration is induced by the thermal load generated by the temperature gradient in the crystal due to the photothermal effect. The bending behaviour is successfully simulated using finite element analysis. Any light-absorbing crystal can be actuated by photothermally induced natural vibration. This finding of versatile crystal actuation can lead to the development of soft robots with high-speed and high-efficient actuation capabilities.

    DOI： 10.1038/s41467-023-37086-8

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    Other Link： https://www.nature.com/articles/s41467-023-37086-8

  • Integrated Polarisation Control in Microlens Arrays: Performance at Visible-Ir Spectral Ranges

    Haoran Mu, Daniel Smith, Tomas Katkus, Darius Gailevicius, Mangirdas Malinauskas, Yoshiaki Nishijima, Paul R Stoddart, Dong Ruan, Meguya Ryu, Junko Morikawa, Taras A Vasiliev, Valeri Lozovski, Daniel Moraru, Soon Hock Ng, Saulius Juodkazis

    2023.3

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  • RGB‐Color Image Analysis for Determination of Birefringence of Micro‐Films and Columnar Coatings

    Meguya Ryu, Molong Han, Lina Grineviciute, Jingwen Hu, Tania Moein, Reo Honda, Tomas Katkus, Mark J. Tobin, Jitraporn Vongsvivut, Tomas Tolenis, Yoshiaki Nishijima, Soon Hock Ng, Saulius Juodkazis, Junko Morikawa

    Laser & Photonics Reviews   2023.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/lpor.202200535

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  • Polarisation Control in Arrays of Microlenses and Gratings: Performance in Visible–IR Spectral Ranges

    Haoran Mu, DANIEL SMITH, Tomas Katkus, Darius Gailevičius, Mangirdas Malinauskas, Yoshiaki Nishijima, Paul Stoddart, Dong Ruan, Meguya Ryu, Junko Morikawa, Taras Vasiliev, Valeri Lozovski, Daniel Moraru, Soon Hock Ng, Saulius Juodkazis

    Micromachines   2023.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/mi14040798

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  • Multi-objective optimization for assisting the design of fixed-type packed bed reactors for chemical heat storage

    Massimiliano Zamengo, Stephen Wu, Ryo Yoshida, Junko Morikawa

    Applied Thermal Engineering   218   119327 - 119327   2023.1

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.applthermaleng.2022.119327

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  • A role of intermolecular interaction modulating thermal diffusivity in organosuperelastic and organoferroelastic cocrystals

    Subham Ranjan, Ryota Morioka, Meguya Ryu, Junko Morikawa, Satoshi Takamizawa

    Chemical Science   2023

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/D3SC03155A

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  • Composite formation of covalent organic framework crystals and sugar alcohols for exploring a new class of heat-storage materials

    Yoichi Murakami, Shoma Mitsui, Shiori Nakagawa, Xiaohan Wang, Hiroki Fujisawa, Meguya Ryu, Junko Morikawa

    Materials Horizons   2023

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/D3MH00905J

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  • RadonPy: automated physical property calculation using all-atom classical molecular dynamics simulations for polymer informatics

    Yoshihiro Hayashi, Junichiro Shiomi, Junko Morikawa, Ryo Yoshida

    npj Computational Materials   8 ( 1 )   2022.11

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The spread of data-driven materials research has increased the need for systematically designed materials property databases. However, the development of polymer databases has lagged far behind other material systems. We present RadonPy, an open-source library that can automate the complete process of all-atom classical molecular dynamics (MD) simulations applicable to a wide variety of polymeric materials. Herein, 15 different properties were calculated for more than 1000 amorphous polymers. The MD-calculated properties were systematically compared with experimental data to validate the calculation conditions; the bias and variance in the MD-calculated properties were successfully calibrated by a machine learning technique. During the high-throughput data production, we identified eight amorphous polymers with extremely high thermal conductivity (&gt;0.4 W ∙ m–1 ∙ K–1) and their underlying mechanisms. Similar to the advancement of materials informatics since the advent of computational property databases for inorganic crystals, database construction using RadonPy will promote the development of polymer informatics.

    DOI： 10.1038/s41524-022-00906-4

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    Other Link： https://www.nature.com/articles/s41524-022-00906-4

  • On the origin of elasticity and heat conduction anisotropy of liquid crystal elastomers at gigahertz frequencies

    Yu Cang, Jiaqi Liu, Meguya Ryu, Bartlomiej Graczykowski, Junko Morikawa, Shu Yang, George Fytas

    Nature Communications   13 ( 1 )   2022.9

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Liquid crystal elastomers that offer exceptional load-deformation response at low frequencies often require consideration of the mechanical anisotropy only along the two symmetry directions. However, emerging applications operating at high frequencies require all five true elastic constants. Here, we utilize Brillouin light spectroscopy to obtain the engineering moduli and probe the strain dependence of the elasticity anisotropy at gigahertz frequencies. The Young’s modulus anisotropy,E||/E⊥~2.6, is unexpectedly lower than that measured by tensile testing, suggesting disparity between the local mesogenic orientation and the larger scale orientation of the network strands. Unprecedented is the robustness ofE||/E⊥to uniaxial load that it does not comply with continuously transformable director orientation observed in the tensile testing. Likewise, the heat conductivity is directional,κ||/κ⊥~3.0 withκ⊥= 0.16 Wm−1K−1. Conceptually, this work reveals the different length scales involved in the thermoelastic anisotropy and provides insights for programming liquid crystal elastomers on-demand for high-frequency applications.

    DOI： 10.1038/s41467-022-32865-1

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    Other Link： https://www.nature.com/articles/s41467-022-32865-1

  • Interfacial thermal conductance of 7075 aluminum alloy microdroplets in contact with a solid at fast melting and crystallization

    A Minakov, J Morikawa, M Ryu, E Zhuravlev, C Schick

    Materials Research Express   2022.8

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  • THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film

    Molong Han, Daniel Smith, Soon Ng, Zoltan Vilagosh, Vijayakumar Anand, Tomas Katkus, Ignas Reklaitis, Haoran Mu, Meguya Ryu, Junko Morikawa, Jitraporn Vongsvivut, Dominique Appadoo, Saulius Juodkazis

    Micromachines   13 ( 8 )   1170 - 1170   2022.7

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  • Analyses of chemiluminescence reactions of fluorophore-linked 1,2-dioxetane isomers in crystals heating at elevated temperature including a development of a simultaneous measurement method of thermal diffusivity and light emission for a single crystal Reviewed

    Chihiro Matsuhashi, Hiroki Fujisawa, Meguya Ryu, Tetsuya Tsujii, Shojiro Maki, Junko Morikawa, Takashi Hirano

    Analytical Science   38 ( 8 )   1019 - 1024   2022.6

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    DOI： 10.1007/s44211-022-00118-2

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  • Probe-based microscale measurement setup for the thermal diffusivity of soft materials

    Meguya Ryu, Megumi Akoshima, Junko Morikawa

    REVIEW OF SCIENTIFIC INSTRUMENTS   93 ( 4 )   2022.4

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    DOI： 10.1063/5.0084891

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  • Polariscopy with optical near-fields

    Ryu Meguya, Soon Hock Ng, Molong Han, Vijayakumar Anand, Tomas Katkus, Jitraporn Vongsvivut, Dominique Appadoo, Yoshiaki Nishijima, Saulius Juodkazis, Junko Morikawa

    Nanoscale Horizons   2022

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  • Intracrystalline Kinetics Analyzed by Real-Time Monitoring of a 1,2-Dioxetane Chemiluminescence Reaction in a Single Crystal

    Matsuhashi, C., Fujisawa, H., Ryu, M., Tsujii, T., Morikawa, J., Oyama, H., Uekusa, H., Maki, S., Hirano, T.

    Bulletin of the Chemical Society of Japan   95 ( 3 )   2022

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  • Coupling of molecular vibration and metasurface modes for efficient mid-infrared emission

    Nishijima, Y., Morimoto, S., Bal?ytis, A., Hashizume, T., Matsubara, R., Kubono, A., To, N., Ryu, M., Morikawa, J., Juodkazis, S.

    Journal of Materials Chemistry C   10 ( 2 )   2022

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  • Anisotropic 3D columnar micro-film coating for applications in infrared and visible spectral ranges

    Hu, J., Han, M., Grineviciute, L., Ng, S.H., An, , V., Katkus, T., Ryu, M., Morikawa, J., Tobin, M.J., Vongsvivut, J., Tolenis, T., Nishijima, Y., Juodkazis, S.

    Applied Surface Science   590   2022

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  • Optical anisotropy of glancing angle deposited thin films on nano-patterned substrates

    Grineviciute, L., Moein, T., Han, M., Ng, S.H., An, , V., Katkus, T., Ryu, M., Morikawa, J., Tobin, M.J., Vongsvivut, J., Tolenis, T., Juodkazis, S.

    Optical Materials Express   12 ( 3 )   2022

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  • Numerical Analysis on the Effect of Thermal Conductivity and Thermal Contact Conductance on Heat Transfer during Dehydration Reaction in a Fixed Packed Bed Reactor for Thermochemical Heat Storage

    Massimiliano Zamengo, Shigehiko Funayama, Hiroki Takasu, Yukitaka Kato, Junko Morikawa

    ISIJ INTERNATIONAL   62 ( 12 )   2559 - 2566   2022

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    DOI： 10.2355/isijinternational.ISIJINT-2022-165

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  • Thermal diffusivity of organosuperelastic soft crystals during stress-induced phase transition

    M. Ryu, S. Takamizawa, J. Morikawa

    Applied Physics Letters   2021.12

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  • Numerical evaluation of a Carnot battery system comprising a chemical heat storage/pump and a Brayton cycle

    Massimiliano Zamengo, Kazuo Yoshida, Junko Morikawa

    JOURNAL OF ENERGY STORAGE   41   2021.9

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    DOI： 10.1016/j.est.2021.102955

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  • Photothermally Driven High-Speed Crystal Actuation and Its Simulation. International journal

    Shodai Hasebe, Yuki Hagiwara, Jun Komiya, Meguya Ryu, Hiroki Fujisawa, Junko Morikawa, Tetsuro Katayama, Daiki Yamanaka, Akihiro Furube, Hiroyasu Sato, Toru Asahi, Hideko Koshima

    Journal of the American Chemical Society   143 ( 23 )   8866 - 8877   2021.6

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    Mechanically responsive crystals have been increasingly explored, mainly based on photoisomerization. However, photoisomerization has some disadvantages for crystal actuation, such as a slow actuation speed, no actuation of thick crystals, and a narrow wavelength range. Here we report photothermally driven fast-bending actuation and simulation of a salicylideneaniline derivative crystal with an o-amino substituent in enol form. Under ultraviolet (UV) light irradiation, these thin (<20 μm) crystals bent but the thick (>40 μm) crystals did not due to photoisomerization; in contrast, thick crystals bent very quickly (in several milliseconds) due to the photothermal effect, even by visible light. Finally, 500 Hz high-frequency bending was achieved by pulsed UV laser irradiation. The generated photothermal energy was estimated based on the photodynamics using femtosecond transient absorption. Photothermal bending is caused by a nonsteady temperature gradient in the thickness direction due to the heat conduction of photothermal energy generated near the crystal surface. The temperature gradient was calculated based on the one-dimensional nonsteady heat conduction equation to simulate photothermally driven crystal bending successfully. Most crystals that absorb light have their own photothermal effects. It is expected that the creation and design of actuation of almost all crystals will be possible via the photothermal effect, which cannot be realized by photoisomerization, and the potential and versatility of crystals as actuation materials will expand in the near future.

    DOI： 10.1021/jacs.1c03588

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  • Thermal Conductivity of Pentiptycene-Based Poly(o-hydroxyimide) Copolymers: A Study via Integrated Experiments and Simulations

    Xingfei Wei, Zihan Huang, Stephen Koch, Massimiliano Zamengo, Yichen Deng, Marilyn L. Minus, Junko Morikawa, Ruilan Guo, Tengfei Luo

    ACS APPLIED POLYMER MATERIALS   3 ( 6 )   2979 - 2987   2021.6

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    DOI： 10.1021/acsapm.1c00128

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  • (Invited) Novel Technique to Measure Thermal Diffusivity of Soft Crystal in Micro Scale

    Meguya Ryu, Junko Morikawa

    ECS Meeting Abstracts   {MA}2021-01 ( 15 )   700 - 700   2021.5

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    DOI： 10.1149/MA2021-0115700mtgabs

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  • Correlation of thermally stimulated current and blow molding condition in poly(ethylene terephthalate) bottles

    Rahmat Satoto, Takashi Hama, Junko Morikawa, Toshimasa Hashimoto

    Polymer Engineering and Science   40 ( 2 )   391 - 397   2021.2

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    DOI： 10.1002/pen.11172

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  • Fourier Transform Infrared Polarization Contrast Imaging Recognizes Proteins Degradation in Lungs upon Metastasis from Breast Cancer. International journal

    Karolina Chrabaszcz, Katarzyna Kaminska, Cai Li Song, Junko Morikawa, Monika Kujdowicz, Ewelina Michalczyk, Marta Smeda, Marta Stojak, Agnieszka Jasztal, Sergei G Kazarian, Kamilla Malek

    Cancers   13 ( 2 )   2021.1

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    The current understanding of mechanisms underlying the formation of metastatic tumors has required multi-parametric methods. The tissue micro-environment in secondary organs is not easily evaluated due to complex interpretation with existing tools. Here, we demonstrate the detection of structural modifications in proteins using emerging Fourier Transform Infrared (FTIR) imaging combined with light polarization. We investigated lungs affected by breast cancer metastasis in the orthotopic murine model from the pre-metastatic phase, through early micro-metastasis, up to an advanced phase, in which solid tumors are developed in lung parenchyma. The two IR-light polarization techniques revealed, for the first time, the orientational ordering of proteins upon the progression of pulmonary metastasis of breast cancer. Their distribution was complemented by detailed histological examination. Polarized contrast imaging recognised tissue structures of lungs and showed deformations in protein scaffolds induced by inflammatory infiltration, fibrosis, and tumor growth. This effect was recognised by not only changes in absorbance of the spectral bands but also by the band shifts and the appearance of new signals. Therefore, we proposed this approach as a useful tool for evaluation of progressive and irreversible molecular changes that occur sequentially in the metastatic process.

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  • Variations of interfacial thermal conductance at melting and crystallization of an indium micro-particle in contact with a solid

    Minakov, A., Morikawa, J., Ryu, M., Zhuravlev, E., Schick, C.

    Materials and Design   201   2021

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  • Attenuated total reflection at thz wavelengths: Prospective use of total internal reflection and polariscopy

    Ryu, M., Ng, S.H., An, , V., Lundgaard, S., Hu, J., Katkus, T., Appadoo, D., Vilagosh, Z., Wood, A.W., Juodkazis, S., Morikawa, J.

    Applied Sciences (Switzerland)   11 ( 16 )   2021

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    DOI： 10.3390/app11167632

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  • Remote-sensing concept using polariscopy for orientation determination below the spatial resolution limit

    Soon Hock Ng, Vijayakumar Anand, Alan Duffy, Alexander Babanin, Meguya Ryu, Junko Morikawa, Saulius Juodkazis

    Proceedings of SPIE - The International Society for Optical Engineering   11693   2021

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    DOI： 10.1117/12.2577096

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  • Anisotropy of 3d columnar coatings in mid-infrared spectral range

    Grineviciute, L., Ng, S.H., Han, M., Moein, T., An, , V., Katkus, T., Ryu, M., Morikawa, J., Tobin, M.J., Vongsvivut, J., Tolenis, T., Juodkazis, S.

    Nanomaterials   11 ( 12 )   2021

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    DOI： 10.3390/nano11123247

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  • Hyperspectral molecular orientation mapping in metamaterials

    Ryu, M., Nishijima, Y., Morimoto, S., To, N., Hashizume, T., Matsubara, R., Kubono, A., Hu, J., Ng, S.H., Juodkazis, S., Morikawa, J.

    Applied Sciences (Switzerland)   11 ( 4 )   2021

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    DOI： 10.3390/app11041544

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  • Thermal diffusivity of organosuperelastic soft crystals during stress-induced phase transition

    Ryu, M., Takamizawa, S., Morikawa, J.

    Applied Physics Letters   119 ( 25 )   2021

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    DOI： 10.1063/5.0055707

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  • Quadrupole modelling of dual lock-in method for the simultaneous measurements of thermal diffusivity and thermal effusivity

    Meguya Ryu, Jean-Christophe Batsale, Junko Morikawa

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   162   2020.12

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    DOI： 10.1016/j.ijheatmasstransfer.2020.120337

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  • Direct Measurement of Temperature Diffusivity of Nanocellulose-Doped Biodegradable Composite Films. International journal

    Hiroki Fujisawa, Meguya Ryu, Stefan Lundgaard, Denver P Linklater, Elena P Ivanova, Yoshiaki Nishijima, Saulius Juodkazis, Junko Morikawa

    Micromachines   11 ( 8 )   2020.7

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    DOI： 10.3390/mi11080738

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  • Thermally conductive molecular assembly composed of an oligo(ethylene glycol)-modified filamentous virus with improved solubility and resistance to organic solvents

    Toshiki Sawada, Taiki Tsuruoka, Naoki Ueda, Hironori Marubayashi, Shuichi Nojima, Junko Morikawa, Takeshi Serizawa

    POLYMER JOURNAL   52 ( 7 )   803 - 811   2020.7

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    DOI： 10.1038/s41428-020-0328-7

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  • Thermal contact conductance at melting and crystallization of metal micro-droplets

    A Minakov, J Morikawa, E Zhuravlev, M Ryu, C Schick

    Materials Research Express   7 ( 6 )   2020.6

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    DOI： 10.1088/2053-1591/ab9a7e

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  • Interfacial region effect on thermal conductivity of silicon nanocrystal and polystyrene nanocomposites

    Firman Bagja Juangsa, Meguya Ryu, Junko Morikawa, Tomohiro Nozaki

    Plasma Processes and Polymers   17 ( 5 )   1900212 - 1900212   2020.5

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    DOI： 10.1002/ppap.201900212

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  • Tilted black-Si: ~0.45 form-birefringence from sub-wavelength needles International journal

    Darius Gailevicius, Meguya Ryu, Reo Honda, Stefan Lundgaard, Tai Suzuki, Jovan Maksimovic, Jingwen Hu, Denver P. Linklater, Elena P. Ivanova, Tomas Katkus, Vijayakumar Anand, Mangirdas Malinauskas, Yoshiaki Nishijima, Mangirdas Malinauskas, Vijayakumar Anand, Soon Hock Ng, Kestutis Staliunas, Junko Morikawa, Saulius Juodkazis

    Optics express   28 ( 11 )   16012 - 16026   2020.3

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    DOI： 10.1364/OE.392646

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  • Evaluation of cooling ability for a novel heat sink made of polyvinyl alcohol hydrogel

    Massimiliano Zamengo, Junko Morikawa

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   143   2019.11

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    DOI： 10.1016/j.ijheatmasstransfer.2019.118523

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  • Predicting Materials Properties with Little Data Using Shotgun Transfer Learning International journal

    Hironao Yamada, Chang Liu, Stephen Wu, Yukinori Koyama, Shenghong Ju, Junichiro Shiomi, Junko Morikawa, Ryo Yoshida

    ACS Central Science   5 ( 10 )   1717 - 1730   2019.10

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    DOI： 10.1021/acscentsci.9b00804

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  • Laser-Inscribed Stress-Induced Birefringence of Sapphire. International journal

    Hua Fan, Meguya Ryu, Reo Honda, Junko Morikawa, Zhen-Ze Li, Lei Wang, Jovan Maksimovic, Saulius Juodkazis, Qi-Dai Chen, Hong-Bo Sun

    Nanomaterials (Basel, Switzerland)   9 ( 10 )   2019.10

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    DOI： 10.3390/nano9101414

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  • Near-Field IR Orientational Spectroscopy of Silk

    Meguya Ryu, Reo Honda, Aina Reich, Adrian Cernescu, Jing-Liang Li, Jingwen Hu, Saulius Juodkazis, Junko Morikawa

    APPLIED SCIENCES-BASEL   9 ( 19 )   2019.10

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    DOI： 10.3390/app9193991

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  • Analysis of molecular orientation in polymeric spherulite using polarized micro attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopic imaging. International journal

    Yuta Hikima, Junko Morikawa, Sergei G Kazarian

    Analytica chimica acta   1065   79 - 89   2019.8

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    DOI： 10.1016/j.aca.2019.02.017

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  • Temperature-Dependent Thermoelastic Anisotropy of the Phenyl Pyrimidine Liquid Crystal International journal

    Meguya Ryu, Yu Cang, Zuyuan Wang, George Fytas, Junko Morikawa

    The Journal of Physical Chemistry C   123 ( 28 )   17148 - 17154   2019.7

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    DOI： 10.1021/acs.jpcc.9b04270

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  • Machine-learning-assisted discovery of polymers with high thermal conductivity using a molecular design algorithm

    Stephen Wu, Yukiko Kondo, Masa-aki Kakimoto, Bin Yang, Hironao Yamada, Isao Kuwajima, Guillaume Lambard, Kenta Hongo, Yibin Xu, Junichiro Shiomi, Christoph Schick, Junko Morikawa, Ryo Yoshida

    NPJ COMPUTATIONAL MATERIALS   5 ( 1 )   2019.6

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    DOI： 10.1038/s41524-019-0203-2

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  • Infrared Polariscopy Imaging of Linear Polymeric Patterns with a Focal Plane Array International journal

    Reo Honda, Meguya Ryu, Masayuki Moritake, Armandas Balcytis, Vygantas Mizeikis, Jitraporn Vongsvivut, Mark J. Tobin, Dominique Appadoo, Jing-Liang Li, Soon Hock Ng, Saulius Juodkazis, Junko Morikawa

    NANOMATERIALS   9 ( 5 )   2019.5

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    DOI： 10.3390/nano9050732

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  • Nanoscale optical and structural characterisation of silk International journal

    Meguya Ryu, Reo Honda, Adrian Cernescu, Arturas Vailionis, Armandas Balcytis, Jitraporn Vongsvivut, Jing-Liang Li, Denver P. Linklater, Elena P. Ivanova, Vygantas Mizeikis, Mark J. Tobin, Junko Morikawa, Saulius Juodkazis

    BEILSTEIN JOURNAL OF NANOTECHNOLOGY   10   922 - 929   2019.2

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    DOI： 10.3762/bjnano.10.93

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  • High-speed dynamics of temperature distribution in ultrafast (up to 108 K/s) chip-nanocalorimeters, measured by infrared thermography of high resolution

    A. Minakov, J. Morikawa, E. Zhuravlev, M. Ryu, A. W. van Herwaarden, C. Schick

    Journal of Applied Physics   125 ( 5 )   054501 - 054501   2019.2

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    DOI： 10.1063/1.5066384

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  • UV illumination for electron and ion beam microscopy and nanofabrication

    Soon Hock Ng, Gediminas Seniutinas, Meguya Ryu, Tomas Katkus, Nguyen Hoai An Le, Paul Stoddart, Junko Morikawa, Saulius Juodkazis

    UV AND HIGHER ENERGY PHOTONICS: FROM MATERIALS TO APPLICATIONS 2019   11086   2019

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    DOI： 10.1117/12.2528681

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  • Hyperspectral mapping of anisotropy

    Meguya Ryu, Reo Honda, Armandas Balčytis, Jitraporn Vongsvivut, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa

    Nanoscale Horizons   4 ( 6 )   1443 - 1449   2019

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    DOI： 10.1039/C9NH00340A

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  • Orientation information added to IR hyperspectral imaging: silk and paracetamol

    Ryu Meguya, Soon Hock Ng, Jitraporn Vongsvivut, Mark J. Tobin, Junko Morikawa, Saulius Juodkazis

    BIOPHOTONICS AUSTRALASIA 2019   11202   2019

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    DOI： 10.1117/12.2551712

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  • Paracetamol Micro-Structure Analysis by Optical Mapping

    Reo Honda, Meguya Ryu, Armandas Balcytis, Jitraporn Vongsvivut, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa

    Applied Surface Science   473   127 - 132   2018.12

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    DOI： 10.1016/j.apsusc.2018.12.121

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  • Nonthermal plasma synthesis of silicon nanoparticles and their thermal transport properties

    Firman Bagja Juangsa, Meguya Ryu, Junko Morikawa, Tomohiro Nozaki

    Journal of Physics D: Applied Physics   51 ( 50 )   505301 - 505301   2018.12

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    DOI： 10.1088/1361-6463/aae3a6

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  • Thermal effect on dispersive infrared spectroscopic imaging of prostate cancer tissue International journal

    Cai L. Song, Meguya Ryu, Junko Morikawa, Archana Kothari, Sergei G. Kazarian

    Journal of Biophotonics   11 ( 12 )   e201800187   2018.12

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    DOI： 10.1002/jbio.201800187

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  • High Thermal Diffusivity in Thermally Treated Filamentous Virus-Based Assemblies with a Smectic Liquid Crystalline Orientation International journal

    Sawada Toshiki, Murata Yuuta, Marubayashi Hironori, Nojima Shuichi, Morikawa Junko, Serizawa Takeshi

    Viruses   10 ( 11 )   2018.11

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  • Simple multi-wavelength imaging of birefringence: case study of silk International journal

    Reo Honda, Meguya Ryu, Jing-Liang Li, Vygantas Mizeikis, Saulius Juodkazis, Junko Morikawa

    Scientific reports   8 ( 1 )   17652 - 17652   2018.9

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    DOI： 10.1038/s41598-018-36114-8

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  • Microscopic infrared thermography for fast estimation of the thermal properties of thin films

    A. Godin, E. Palomo Del Barrio, J. Morikawa, M. Duquesne

    Journal of Applied Physics   124 ( 8 )   2018.8

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  • Analysis of the adhesive properties of carbon nanotube- and graphene oxide nanoribbon-dispersed aliphatic epoxy resins based on the Maxwell model

    M. Shioya, Y. Kuroyanagi, M. Ryu, J. Morikawa

    International Journal of Adhesion and Adhesives   84   27 - 36   2018.8

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    DOI： 10.1016/j.ijadhadh.2018.01.019

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  • Micro-thermocouple on nano-membrane: thermometer for nanoscale measurements International journal

    Armandas Balcytis, Meguya Ryu, Saulius Juodkazis, Junko Morikawa

    Scientific reports   8 ( 1 )   6324 - 6324   2018.4

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  • Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity International journal

    Toshiki Sawada, Yuta Murata, Hironori Marubayashi, Shuichi Nojima, Junko Morikawa, Takeshi Serizawa

    SCIENTIFIC REPORTS   8 ( 1 )   5412 - 5412   2018.4

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    DOI： 10.1038/s41598-018-23102-1

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  • 3D printed polarizing grids for IR-THz synchrotron radiation

    Meguya Ryu, Denver Linklater, William Hart, Armandas Balčytis, Edvinas Skliutas, Mangirdas Malinauskas, Dominique Appadoo, Yaw Ren Eugene Tan, Elena P. Ivanova, Junko Morikawa, Saulius Juodkazis

    Journal of Optics (United Kingdom)   20 ( 3 )   2018.3

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    DOI： 10.1088/2040-8986/aaa6fb

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  • Integrating prior knowledge and machine learning for efficient design of high thermal conductivity polymers

    Stephen Wu, Yukiko Kondo, Isao Kuwajima, Guillaume Lambard, Kenta Hongo, Junko Morikawa, Yibin Xu, Ryo Yoshida

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   255   2018.3

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  • Calibration Procedure for Attenuation Coefficient Measurements in Highly Opaque Media Using Infrared Focal Plane Array (IRFPA) Spectroscopy International journal

    Sara Kirchner, Sebastien Narinsamy, Alain Sommier, Marta Romano, Meguya Ryu, Junko Morikawa, Jacques Leng, Jean-Christophe Batsale, Christophe Pradere

    APPLIED SPECTROSCOPY   72 ( 2 )   177 - 187   2018.2

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    DOI： 10.1177/0003702817736320

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  • Orientational Mapping Augmented Sub-Wavelength Hyper-Spectral Imaging of Silk (vol 7, pg 7419, 2017) International journal

    Meguya Ryu, Armandas Balcytis, Xuewen Wang, Jitraporn Vongsvivut, Yuta Hikima, Jingliang Li, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa

    SCIENTIFIC REPORTS   8 ( 1 )   1752 - 1752   2018.1

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    DOI： 10.1038/s41598-018-19721-3

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  • Phonon Transport Properties in Silicon Nanoparticles and Polymer Nanocomposite Thin Films

    Firman Bagja Juangsa, Yoshiki Muroya, Meguya Ryu, Junko Morikawa, Tomohiro Nozaki

    INTERNATIONAL CONFERENCE ON THERMAL SCIENCE AND TECHNOLOGY (ICTST) 2017   1984   2018

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    DOI： 10.1063/1.5046594

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  • Recent advances in macro ATR-FTIR microspectroscopic technique for high resolution surface characterisation at Australian Synchrotron IR Beamline

    Jitraporn Vongsvivut, Vi Khanh Truong, Nishar Hameed, David A. Beattie, Marta Krasowska, Sally Gras, Gregory S. Watson, Jolanta A. Watson, David Perez-Guaita, Philip Heraud, Bayden R. Wood, Junko Morikawa, Saulius Juodkazis, Elena P. Ivanova, Mark J. Tobin

    Optics InfoBase Conference Papers   Part F87-MICS 2018   2018

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    DOI： 10.1364/MICS.2018.MT3C.5

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  • 3D printed gratings: IR-THz applications

    Denver Linklater, Meguya Ryu, William Hart, Armandas Balcytis, Edvinas Skliutas, Mangirdas Malinauskas, Dominique Appadoo, Yaw Ren Eugene Tan, Elena P. Ivanova, Junko Morikawa, Saulius Juodkazis

    Optics InfoBase Conference Papers   Part F98-BGPPM 2018   2018

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    DOI： 10.1364/BGPPM.2018.JTh4A.2

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  • Nanoscale chemical mapping of laser-solubilized silk

    Meguya Ryu, Hanae Kobayashi, Armandas Balcytis, Xuewen Wang, Jitraporn Vongsvivut, Jingliang Li, Norio Urayama, Vygantas Mizeikis, Mark Tobin, Saulius Juodkazis, Junko Morikawa

    MATERIALS RESEARCH EXPRESS   4 ( 11 )   2017.8

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    DOI： 10.1088/2053-1591/aa98a9

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    Other Link： http://arxiv.org/pdf/1709.01799v1

  • 3D laser printing by ultra-short laser pulses for micro-optical applications: towards telecom wavelengths

    Meguya Ryu, Vygantas Mizeikis, Junko Morikawa, Hernando Magallanes, Etienne Brasselet, Simonas Varapnickas, Mangirdas Malinauskas, Saulius Juodkazis

    PACIFIC RIM LASER DAMAGE 2017-OPTICAL MATERIALS FOR HIGH-POWER LASERS   10339   2017.7

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    DOI： 10.1117/12.2270706

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    Other Link： http://arxiv.org/pdf/1707.09365v1

  • Microscale spectroscopic thermal imaging of n-alkanes

    M. Ryu, M. Romano, J. C. Batsale, C. Pradere, J. Morikawa

    Quantitative InfraRed Thermography Journal   14 ( 2 )   154 - 163   2017.7

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    DOI： 10.1080/17686733.2016.1234672

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  • Polarisation of THz synchrotron radiation: from its measurement to control

    Meguya Ryu, Denver Linklater, William Hart, Armandas Balcytis, Edvinas Skliutas, Mangirdas Malinauskas, Dominique Appadoo, Yaw-Ren Eugene Tan, Junko Morikawa, Saulius Juodkazis

    2017.7

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    Polarisation analysis of synchrotron THz radiation was carried out with a
    standard stretched polyethylene polariser and revealed that the linearly
    polarised (horizontal) component contributes up to 22 +/- 5% to the circular
    polarised synchrotron emission extracted by a gold-coated mirror with a
    horizontal slit inserted near a bending magnet edge. Comparison with
    theoretical predictions shows a qualitative match with dominance of the edge
    radiation. Grid polarisers 3D-printed out of commercial acrilic resin were
    tested for the polariser function and showed spectral regions where the
    dichroic ratio DR > 1 and < 1 implying importance of molecular and/or stress
    induced anisotropy. Metal-coated 3D-printed THz optical elements can find a
    range of applications in intensity and polarisation control of THz beams.

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    Other Link： http://arxiv.org/pdf/1707.01578v1

  • Orientational Mapping Augmented Sub-Wavelength Hyper-Spectral Imaging of Silk International journal

    Meguya Ryu, Armandas Balcytis, Xuewen Wang, Jitraporn Vongsvivut, Yuta Hikima, Jingliang Li, Mark J. Tobin, Saulius Juodkazis, Junko Morikawa

    SCIENTIFIC REPORTS   7 ( 1 )   7419 - 7419   2017.6

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    DOI： 10.1038/s41598-017-07502-3

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    Other Link： http://arxiv.org/pdf/1706.01302v1

  • Comparative study of thermal conductivity in crystalline and amorphous nanocomposite

    Firman Bagja Juangsa, Yoshiki Muroya, Meguya Ryu, Junko Morikawa, Tomohiro Nozaki

    APPLIED PHYSICS LETTERS   110 ( 25 )   2017.6

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    DOI： 10.1063/1.4986920

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  • Thermal diffusivity measurement of erythritol and numerical analysis of heat storage performance on a fin-type heat exchanger

    Massimiliano Zamengo, Tomohiro Funada, Junko Morikawa

    APPLIED THERMAL ENGINEERING   117   376 - 384   2017.5

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    DOI： 10.1016/j.applthermaleng.2017.02.040

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  • Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range. International journal

    Armandas Balčytis, Meguya Ryu, Xuewen Wang, Fabio Novelli, Gediminas Seniutinas, Shan Du, Xungai Wang, Jingliang Li, Jeffrey Davis, Dominique Appadoo, Junko Morikawa, Saulius Juodkazis

    Materials (Basel, Switzerland)   10 ( 4 )   2017.3

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    DOI： 10.3390/ma10040356

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  • Non-contact temperature field measurement of solids by infrared multispectral thermotransmittance

    C. Pradere, M. Ryu, A. Sommier, M. Romano, A. Kusiak, J. L. Battaglia, J. C. Batsale, J. Morikawa

    Journal of Applied Physics   121 ( 8 )   2017.2

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    DOI： 10.1063/1.4976209

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  • Nano-rescaling of gold films on polystyrene: thermal management for SERS. International journal

    Armandas Balčytis, Meguya Ryu, Gediminas Seniutinas, Paul R Stoddart, Md Abdullah Al Mamun, Junko Morikawa, Saulius Juodkazis

    Nanoscale   9 ( 2 )   690 - 695   2017.1

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    DOI： 10.1039/c6nr06904e

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  • Micro-scale thermal imaging of CO2 absorption in the thermochemical energy storage of Li metal oxides at high temperature

    Junko Morikawa, Hiroki Takasu, Massimiliano Zamengo, Yukitaka Kato

    THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXIX   10214   2017

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    DOI： 10.1117/12.2263079

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  • Infrared thermo-spectroscopic imaging of styrene radical polymerization in microfluidics

    M. Ryu, J. A. Kimber, T. Sato, R. Nakatani, T. Hayakawa, M. Romano, C. Pradere, A. A. Hovhannisyan, S. G. Kazarian, J. Morikawa

    Chemical Engineering Journal   324   259 - 265   2017

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    DOI： 10.1016/j.cej.2017.05.001

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  • Simultaneous measurements of anisotropic thermal diffusivity and thermal effusivity of liquid crystals using temperature wave analysis method

    Meguya Ryu, Junko Morikawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 11 )   2016.11

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    DOI： 10.7567/JJAP.55.111701

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  • Thermal conductivity of silicon nanocrystals and polystyrene nanocomposite thin films

    Firman Bagja Juangsa, Yoshiki Muroya, Meguya Ryu, Junko Morikawa, Tomohiro Nozaki

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   49 ( 36 )   2016.9

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    DOI： 10.1088/0022-3727/49/36/365303

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  • Insights into Material's Thermal Properties and Heat Transfer

    Massimiliano Zamengo, Junko Morikawa

    SEN-I GAKKAISHI   72 ( 7 )   345 - 346   2016.7

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  • Simultaneous microscopic measurements of thermal and spectroscopic fields of a phase change material

    M. Romano, M. Ryu, J. Morikawa, J. C. Batsale, C. Pradere

    Infrared Physics and Technology   76   65 - 71   2016.5

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    DOI： 10.1016/j.infrared.2016.01.010

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  • Nanostructured Antireflective and Thermoisolative Cicada Wings International journal

    Junko Morikawa, Meguya Ryu, Gediminas Seniutinas, Armandas Balcytis, Ksenia Maximova, Xuewen Wang, Massimiliano Zamengo, Elena P. Ivanova, Saulius Juodkazis

    LANGMUIR   32 ( 18 )   4698 - 4703   2016.5

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    DOI： 10.1021/acs.langmuir.6b00621

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  • Superimpose signal processing method for micro-scale thermal imaging of solar salts at high temperature

    Junko Morikawa, Massimiliano Zamengo, Yukitaka Kato

    THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXVIII   9861   2016

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    DOI： 10.1117/12.2225130

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  • Silk fibroin as a water-soluble bio-resist and its thermal properties

    Junko Morikawa, Meguya Ryu, Ksenia Maximova, Armandas Balcytis, Gediminas Seniutinas, Linpeng Fan, Vygantas Mizeikis, Jingliang Li, Xuewen Wang, Massimiliano Zamengo, Xungai Wang, Saulius Juodkazis

    RSC ADVANCES   6 ( 14 )   11863 - 11869   2016

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    DOI： 10.1039/c5ra20201a

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  • Multispectral IR thermotransmittance technique for temperature measurement

    C. Pradere, M. Ryu, A. Sommier, M. Romano, J. Morikawa, J.C. Batsale

    Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography   2016

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    DOI： 10.21611/qirt.2016.102

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  • Si-based infrared optical filters

    Armandas Balčytis, Meguya Ryu, Gediminas Seniutinas, Yoshiaki Nishijima, Yuta Hikima, Massimiliano Zamengo, Raimondas Petruškevičius, Junko Morikawa, Saulius Juodkazis

    Optical Engineering   54 ( 12 )   2015.12

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    DOI： 10.1117/1.OE.54.12.127103

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  • Black-CuO: surface-enhanced Raman scattering and infrared properties. International journal

    Armandas Balčytis, Meguya Ryu, Gediminas Seniutinas, Jurga Juodkazytė, Bruce C C Cowie, Paul R Stoddart, Massimiliano Zamengo, Junko Morikawa, Saulius Juodkazis

    Nanoscale   7 ( 43 )   18299 - 304   2015.11

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    DOI： 10.1039/c5nr04783h

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  • Photo-controllable thermal diffusivity and thermal conductivity driven by the orientation change of nematic liquid crystal with azo-dendrimers

    Meguya Ryu, Hideo Takezoe, Osamu Haba, Koichiro Yonetake, Junko Morikawa

    APPLIED PHYSICS LETTERS   107 ( 22 )   2015.11

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    DOI： 10.1063/1.4936374

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  • Thermal diffusivity anisotropy measured by a temperature wave method in the homologous series of (p-alkoxybenzylidene)-p '-octylaniline (nO.8) International journal

    Michiru Uehara, Hideo Takezoe, Natasa Vaupotic, Damian Pociecha, Ewa Gorecka, Yoshio Aoki, Junko Morikawa

    JOURNAL OF CHEMICAL PHYSICS   143 ( 7 )   074903 - 074903   2015.8

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    DOI： 10.1063/1.4928587

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  • Analysis of crystal growth kinetics in undercooled melts by infrared thermography

    Alexandre Godin, Marie Duquesne, Elena Palomo Del Barrio, Junko Morikawa

    Quantitative InfraRed Thermography Journal   12 ( 2 )   237 - 251   2015.7

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    DOI： 10.1080/17686733.2015.1066133

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  • Fast infrared imaging spectroscopy technique (FIIST)

    M. Romano, C. Ndiaye, A. Duphil, A. Sommier, J. Morikawa, J. Mascetti, J. C. Batsale, L. Servant, C. Pradere

    Infrared Physics and Technology   68   152 - 158   2015.1

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    DOI： 10.1016/j.infrared.2014.12.005

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  • Superimpose methods for uncooled infrared camera applied to the micro-scale thermal characterization of composite materials

    Junko Morikawa

    THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXVII   9485   2015

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    DOI： 10.1117/12.2180475

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  • Discontinuous Thermal Diffusivity Change due to the Anchoring Transition of a Liquid Crystal on a Perfluoropolymer Surface International journal

    Michiru Uehara, Satoshi Aya, Fumito Araoka, Ken Ishikawa, Hideo Takezoe, Junko Morikawa

    CHEMPHYSCHEM   15 ( 7 )   1452 - 1456   2014.5

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    DOI： 10.1002/cphc.201300975

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  • Honda's thermobalance

    Yasutoshi Saito, Junko Morikawa

    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY   113 ( 3 )   1157 - 1168   2013.9

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    DOI： 10.1007/s10973-013-2972-z

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  • Thermal Diffusivity of Hexagonal Boron Nitride Composites Based on Cross-Linked Liquid Crystalline Polyimides International journal

    Yu Shoji, Tomoya Higashihara, Masatoshi Tokita, Junko Morikawa, Junji Watanabe, Mitsuru Ueda

    ACS APPLIED MATERIALS & INTERFACES   5 ( 8 )   3417 - 3423   2013.4

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    DOI： 10.1021/am400460p

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  • Wavenumber dependence of FT-IR image of molecular orientation in banded spherulites of poly(3-hydroxybutyrate) and poly(l-lactic acid)

    Yuta Hikima, Junko Morikawa, Toshimasa Hashimoto

    Macromolecules   46 ( 4 )   1582 - 1590   2013.2

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    DOI： 10.1021/ma302560q

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  • Critical anomalies in thermal diffusivity of liquid-crystalline terephthal-bis-(4-n-butylaniline) International journal

    Junko Morikawa, Toshimasa Hashimoto, Akira Kishi, Yoshio Shinoda, Kenji Ema, Hideo Takezoe

    PHYSICAL REVIEW E   87 ( 2 )   022501 - 022501   2013.2

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    DOI： 10.1103/PhysRevE.87.022501

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  • Cross-Linked Liquid Crystalline Polyimides with Siloxane Units: Their Morphology and Thermal Diffusivity

    Yu Shoji, Ryohei Ishige, Tomoya Higashihara, Junko Morikawa, Toshimasa Hashimoto, Atsushi Takahara, Junji Watanabe, Mitsuru Ueda

    MACROMOLECULES   46 ( 3 )   747 - 755   2013.2

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    DOI： 10.1021/ma302486s

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  • Optical and thermal characterization on micro-optical elements made by femtosecond laser writing

    R. Buividas, V. Mizeikis, G. Kiršanske, A. Žukauskas, M. Malinauskas, T. Murayama, Y. Hikima, J. Morikawa, S. Juodkazis

    Proceedings of SPIE - The International Society for Optical Engineering   8923   2013

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    DOI： 10.1117/12.2033787

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  • Imaging of two-dimensional distribution of molecular orientation in poly(ethylene oxide) spherulite using IR spectrum and birefringence

    Yuta Hikima, Junko Morikawa, Toshimasa Hashimoto

    Macromolecules   45 ( 20 )   8356 - 8362   2012.10

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    DOI： 10.1021/ma3010372

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  • Evaluation of thermal diffusivity of cross-linked liquid crystalline polyimides with siloxane units

    Yu Shoji, Motoi Harada, Ryohei Ishige, Tomoya Higashihara, Junko Morikawa, Toshimasa Hashimoto, Junji Watanabe, Mitsuru Ueda

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   244   2012.8

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  • Micro-scale thermal diffusivity measurements of banded spherulites of poly-(L-lactic acid) using a thermo-electric micro sensor

    Akihiro Orie, Junko Morikawa, Toshimasa Hashimoto

    THERMOCHIMICA ACTA   532   148 - 151   2012.3

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    DOI： 10.1016/j.tca.2011.08.017

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  • Micro-scale thermal analysis with cooled and uncooled infrared cameras

    Junko Morikawa, Eita Hayakawa, Toshimasa Hashimoto

    THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXIV   8354   2012

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    DOI： 10.1117/12.918252

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  • Thermal and optical properties of sol-gel and SU-8 resists

    Toshiyuki Suzuki, Junko Morikawa, Toshimasa Hashimoto, Ricardas Buividas, Gediminas Gervinskas, Domas Paipulas, Mangirdas Malinauskas, Vygantas Mizeikis, Saulius Juodkazis

    ADVANCED FABRICATION TECHNOLOGIES FOR MICRO/NANO OPTICS AND PHOTONICS V   8249   2012

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    DOI： 10.1117/12.907028

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  • Micro-scale thermal imaging of advanced organic and polymeric materials

    Junko Morikawa

    INFRARED REMOTE SENSING AND INSTRUMENTATION XX   8511   2012

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    DOI： 10.1117/12.930757

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  • Micro-scale thermal imaging of organic and polymeric materials with cooled and uncooled infrared cameras

    J. Morikawa, E. Hayakawa, T. Hashimoto

    Advances in Optical Technologies   2012

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    DOI： 10.1155/2012/484650

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  • Thermal imaging of a heat transport in regions structured by femtosecond laser International journal

    Junko Morikawa, Eita Hayakawa, Toshimasa Hashimoto, Ricardas Buividas, Saulius Juodkazis

    OPTICS EXPRESS   19 ( 21 )   20542 - 20550   2011.10

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    DOI： 10.1364/OE.19.020542

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  • Estimation of frequency from a temperature scanning rate in differential scanning calorimetry at the glass transition of polystyrene

    Junko Morikawa, Toshimasa Hashimoto

    POLYMER   52 ( 18 )   4129 - 4135   2011.8

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    DOI： 10.1016/j.polymer.2011.06.052

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  • FT-IR image processing algorithms for in-plane orientation function and azimuth angle of uniaxially drawn polyethylene composite film

    Yuta Hikima, Junko Morikawa, Toshimasa Hashimoto

    Macromolecules   44 ( 10 )   3950 - 3957   2011.5

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    DOI： 10.1021/ma2003129

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  • Influence of ordering change on the optical and thermal properties of inflation polyethylene films

    Junko Morikawa, Akihiro Orie, Yuta Hikima, Toshimasa Hashimoto, Saulius Juodkazis

    APPLIED SURFACE SCIENCE   257 ( 12 )   5439 - 5442   2011.4

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    DOI： 10.1016/j.apsusc.2010.11.109

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  • Thermal imaging of micro-structured polymers with high-speed infrared camera

    J. Morikawa, T. Hashimoto

    Proceedings of SPIE - The International Society for Optical Engineering   8204   2011

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    DOI： 10.1117/12.903241

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  • Application of micro-scale thermography to the thermal analysis of polymeric and organic materials

    Junko Morikawa, Eita Hayakawa, Toshimasa Hashimoto

    THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXIII   8013   2011

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    DOI： 10.1117/12.884943

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  • Thermal and optical properties of femtosecond-laser-structured PMMA

    Junko Morikawa, Akihiro Orie, Toshimasa Hashimoto, Saulius Juodkazis

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   101 ( 1 )   27 - 31   2010.10

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    DOI： 10.1007/s00339-010-5759-0

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  • Thermal and optical properties of the femtosecond-laser-structured and stress-induced birefringent regions in sapphire International journal

    Junko Morikawa, Akihiro Orie, Toshimasa Hashimoto, Saulius Juodkazis

    OPTICS EXPRESS   18 ( 8 )   8300 - 8310   2010.4

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    DOI： 10.1364/OE.18.008300

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  • Thermal diffusivity in femtosecond-laser-structured micro-volumes of polymers

    Junko Morikawa, Akihiro Orie, Toshimasa Hashimoto, Saulius Juodkazis

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   98 ( 3 )   551 - 556   2010.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s00339-009-5493-7

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  • Two-dimensional thermal analysis of organic molecular crystals and polymeric spherulites by microscale thermography

    Junko Morikawa, Eita Hayakawa, Kazuyuki Ikuo, Toshimasa Hashimoto

    THERMOSENSE XXXII   7661   2010

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    DOI： 10.1117/12.849873

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  • Intercomparison of thermal conductivity and thermal diffusivity methods for plastics

    Martin Rides, Junko Morikawa, Lars Halldahl, Bruno Hay, Hubert Lobo, Angela Dawson, Crispin Allen

    POLYMER TESTING   28 ( 5 )   480 - 489   2009.8

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    DOI： 10.1016/j.polymertesting.2009.03.002

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  • Thermal diffusivity of aromatic polyimide thin films by temperature wave analysis

    Junko Morikawa, Toshimasa Hashimoto

    JOURNAL OF APPLIED PHYSICS   105 ( 11 )   2009.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.3116509

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  • Optical and Thermal Characteristics of Nd:LuVO4 Grown by Floating Zone Method

    Takayo Ogawa, Yoshiharu Urata, Mikio Higuchi, Jun-ichi Takahashi, Ceelia Leong, Junko Morikawa, Toshimasa Hashimoto, Satoshi Wada

    APPLIED PHYSICS EXPRESS   2 ( 1 )   0125011 - 0125013   2009.1

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    DOI： 10.1143/APEX.2.012501

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  • Microscale thermography of freezing biological cells in view of cryopreservation

    Christophe Pradere, Junko Morikawa, Jean Toutain, Jean-Christophe Batsale, Eita Hayakawa, Toshimasa Hashimoto

    QIRT JOURNAL   6 ( 1 )   37 - 61   2009

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    DOI： 10.3166/qirt.6.37-61

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  • Thermal conductivity/diffusivity of Nd3+ doped GdVO4, YVO4, LuVO4, and Y3Al5O12 by temperature wave analysis

    Junko Morikawa, Ceelia Leong, Toshimasa Hashimoto, Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Mikio Higuchi, Jun-ichi Takahashi

    JOURNAL OF APPLIED PHYSICS   103 ( 6 )   2008.3

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    DOI： 10.1063/1.2899181

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  • Thermal conductivity/diffusivity of Nd3+ doped GdVO4, YVO4, LuVO4 and Y3Al5O12 measured by temperature wave method

    Junko Morikawa, Toshimasa Hashimoto, Takayo Ogawa, Satoshi Wada, Mikio Higuchi

    2007 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1-4   21 - 22   2007

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/CLEOPR.2007.4391095

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  • Thermal diffusivity of polyolefins by temperature wave analysis

    H. J. Chang, J. Morikawa, T. Hashimoto

    Journal of Applied Polymer Science   99 ( 3 )   1104 - 1110   2006.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/app.22102

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  • Temperature distribution in a thin-film chip utilized for advanced nanocalorimetry

    A. Minakov, J. Morikawa, T. Hashimoto, H. Huth, C. Schick

    Measurement Science and Technology   17 ( 1 )   199 - 207   2006.1

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1088/0957-0233/17/1/031

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  • Thermal diffusivity measurement of low-k dielectric thin film by temperature wave analysis

    Junko Morikawa, Toshimasa Hashimoto

    Thermochimica Acta   432 ( 2 )   216 - 221   2005.7

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1016/j.tca.2005.04.005

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  • Effect of cryoprotectants on eutectics of NaCl·2H<inf>2</inf>O/ice and KCl/ice studied by temperature wave analysis and differential scanning calorimetry

    Ningjuan Chen, Junko Morikawa, Toshimasa Hashimoto

    Thermochimica Acta   431 ( 1-2 )   106 - 112   2005.6

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1016/j.tca.2005.01.050

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  • Thermal diffusivity of binary mixture of n-tricosane and n-tetracosane by Fourier transform temperature wave analysis

    Naoko Miyamoto, Junko Morikawa, Toshimasa Hashimoto

    Thermochimica Acta   431 ( 1-2 )   62 - 67   2005.6

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1016/j.tca.2005.01.040

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  • Effect of amino acids on the eutectic behavior of NaCl solutions studied by DSC

    N. J. Chen, J. Morikawa, T. Hashimoto

    Cryobiology   50 ( 3 )   264 - 272   2005.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.cryobiol.2005.02.004

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  • Thermal diffusivity of eutectic of alkali chloride and ice in the freezing-thawing process by temperature wave analysis

    N. J. Chen, J. Morikawa, A. Kishi, T. Hashimoto

    Thermochimica Acta   429 ( 1 )   73 - 79   2005.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tca.2004.11.010

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  • Optical properties and thermal characteristics of the floating zone grown Nd:LuVO<inf>4</inf> crystals

    Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Toshiyuki Shimizu, Mikio Higuchi, Junichi Takahashi, Junko Morikawa, Toshimasa Hashimoto

    OSA Trends in Optics and Photonics Series   98   36 - 40   2005

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1364/assp.2005.36

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  • Precise measurement of thermal conductivities of Nd-doped laser materials by the thermal wave analysis

    Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Junko Morikawa, Toshimasa Hashimoto, Mikio Higuchi, Jun Ichi Takahashi

    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS   2005   51 - 52   2005

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/LEOS.2005.1547873

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  • Optical and thermal characteristics of the Nd:LuVO<inf>4</inf> crystals grown by the floating zone method

    Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Toshiyuki Shimizu, Mikio Higuchi, Junichi Takahashi, Junko Morikawa, Toshimasa Hashimoto

    Conference on Lasers and Electro-Optics Europe - Technical Digest   48   2005

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/CLEOE.2005.1567837

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  • Two-dimensional thermal analysis for freezing of endothelial cells by high-speed microscopic IR focal plane arrays

    Junko Morikawa, Toshimasa Hashimoto, Kimiko Yamamoto, Joji Ando

    Progress in Biomedical Optics and Imaging - Proceedings of SPIE   5697   282 - 290   2005

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1117/12.591527

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  • Characterization of heat conduction in a polymer film

    Fumiaki Takahashi, Katsuyoshi Ito, Junko Morikawa, Toshimasa Hashimoto, Ichiro Hatta

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   43 ( 10 )   7200 - 7204   2004.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JJAP.43.7200

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  • Effects of Copolyester/Polycarbonate Blend Composition on the Thermal Diffusivity of Dye Transfer Printing

    Tadakazu Miyata, Kanako Inaki, Junko Morikawa, Rahmat Satoto, Toshimasa Hashimoto

    Journal of Applied Polymer Science   92 ( 1 )   72 - 76   2004.4

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/app.13638

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  • Two-dimensional microscale thermal analysis of freezing of onionskin cells by high-speed infrared focal plane arrays

    Toshimasa Hashimoto, Junko Morikawa

    Japanese Journal of Applied Physics, Part 2: Letters   42 ( 6 B )   2003.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/jjap.42.l706

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  • Two-dimensional thermal analysis for freezing of plant and animal cells by high-speed microscopic IR camera

    Junko Morikawa, Toshimasa Hashimoto, Eita Hayakawa, Hideyuki Uemura

    Proceedings of SPIE - The International Society for Optical Engineering   5073   148 - 153   2003

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1117/12.487047

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  • Effect of catalysts on thermally stimulated current in poly(ethylene terephthalate)

    R. Satoto, J. Morikawa, T. Hashimoto

    Journal of Thermal Analysis and Calorimetry   70 ( 3 )   713 - 722   2002

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1023/A:1022287716073

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  • Relaxation behavior of ultradrawn poly(ethylene) film by temperature wave analysis

    T. Hashimoto, J. Morikawa, C. Sawatari

    Journal of Thermal Analysis and Calorimetry   70 ( 3 )   693 - 701   2002

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1023/A:1022283515164

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  • A new apparatus for thermal diffusivity and specific heat measurements of films and liquids by means of Fourier transform thermal analysis

    Akikazu Maesono, Youichi Takasaki, Yukio Maeda, Ronald P. Tye, Junko Morikawa, Toshimasa Hashimoto

    High Temperatures - High Pressures   34 ( 2 )   127 - 134   2002

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1068/htwu457

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  • Thermophysical properties of poly(propylene)-based composite polymer

    W. D. Jung, J. Morikawa, T. Hashimoto

    Journal of Thermal Analysis and Calorimetry   64 ( 2 )   509 - 519   2001

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1023/A:1011582614956

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  • Simultaneous measurement of thermal diffusivity, heat capacity, and thermal conductivity by Fourier transform thermal analysis

    Junko Morikawa, Toshimasa Hashimoto, Akikazu Maesono

    High Temperatures - High Pressures   33 ( 4 )   387 - 395   2001

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1068/htwu377

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  • A new thermally conductive die attach film with low stress and excellent reliability

    Takashi Masuko, Hiroki Hayashi, Shinji Takeda, Junko Morikawa, Toshimasa Hashimoto

    Proceedings of SPIE - The International Society for Optical Engineering   4587   741 - 744   2001

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  • New technique for Fourier transform thermal analysis

    J. Morikawa, T. Hashimoto

    Journal of Thermal Analysis and Calorimetry   64 ( 1 )   403 - 412   2001

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1023/A:1011542625451

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  • Simultaneous measurement of heat capacity and thermal diffusivity in solid-solid and solid-liquid phase transitions of n-alkane

    J. Morikawa, T. Hashimoto

    Thermochimica Acta   352-353   291 - 296   2000.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/S0040-6031(99)00479-7

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  • Thermal diffusivity measurement of polyamide mesh by temperature wave analysis

    W. D. Jung, J. Morikawa, T. Hashimoto

    International Journal of Thermophysics   21 ( 2 )   503 - 512   2000

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1023/A:1006604201211

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  • Thermally stimulated current studies on molecular relaxation and blow moulding of poly(ethylene terephthalate)

    Rahmat Satoto, Junko Morikawa, Toshimasa Hashimoto

    Polymer International   48 ( 6 )   509 - 514   1999.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/(sici)1097-0126(199906)48:6<509::aid-pi183>3.0.co;2-w

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  • Flame Retardation of Cellulosic Fibers Characterized by Apparent Activation Energy of Thermal Degradation

    Shigeko Nakanishi, Junko Morikawa, Toshimasa Hashimoto

    Textile Research Journal   69 ( 3 )   208 - 213   1999.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1177/004051759906900308

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  • Analysis of high-order harmonics of temperature wave for fourier transform thermal analysis

    Junko Morikawa, Toshimasa Hashimoto

    Japanese Journal of Applied Physics, Part 2: Letters   37 ( 12 PART A )   1998.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/jjap.37.l1484

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  • Frequency dependent thermal diffusivity of polymers by temperature wave analysis

    Toshimasa Hashimoto, Junko Morikawa, Tsuyoshi Kurihara, Takayuki Tsuji

    Thermochimica Acta   304-305 ( SPEC. ISS. )   151 - 156   1997.11

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/S0040-6031(97)00026-9

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  • Study on thermal diffusivity of poly(ethylene terephthalate) and poly(ethylene naphthalate)

    Junko Morikawa, Toshimasa Hashimoto

    Polymer   38 ( 21 )   5397 - 5400   1997.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/S0032-3861(97)00092-X

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  • Thermal diffusivity of thermosetting materials by temperature-wave analysis

    Junko Morikawa, Tsuyoshi Kurihara, Toshimasa Hashimoto, Gal Sherbelis

    Thermochimica Acta   299 ( 1-2 )   95 - 100   1997.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/s0040-6031(97)00141-x

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  • Measurement of the thermal diffusivity of thin films by an AC joule-heating method

    T. Kurihara, J. Morikawa, T. Hashimoto

    International Journal of Thermophysics   18 ( 2 )   505 - 513   1997.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/BF02575179

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  • Thermal diffusivity measurement of papers by an AC joule heating method

    J. Morikawa, T. Hashimoto

    Polymer International   45 ( 2 )   207 - 210   1997.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/(SICI)1097-0126(199802)45:2<207::AID-PI894>3.0.CO;2-Y

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  • Thermal diffusivity in a binary mixture of poly(phenylene oxide) and polystyrene

    Junko Morikawa, Aoi Kobayahi, Toshimasa Hashimoto

    Thermochimica Acta   267 ( C )   289 - 296   1995.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0040-6031(95)02486-7

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  • Study of change in thermal diffusivity of amorphous polymers during glass transition

    Junko Morikawa, Junji Tan, Toshimasa Hashimoto

    Polymer   36 ( 23 )   4439 - 4443   1995

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0032-3861(95)96850-8

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  • Demixing Kinetics in a Binary Polymer Mixture of Poly(methyl methacrylate) and Poly(acrylonitrile-co-styrene)

    Junko Maruta, Takashi Ohnaga, Takashi Inoue

    Macromolecules   26 ( 24 )   6386 - 6390   1993

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ma00076a013

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  • Phase separation in a mixture of poly(ether sulphone) and poly(ethyl oxazoline): observation in real and reciprocal spaces

    Hironobu Nakamura, Junko Maruta, Takashi Ohnaga, Takashi Inoue

    Polymer   31 ( 2 )   303 - 307   1990.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0032-3861(90)90123-G

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  • Apparent phase dissolution at the two-phase region in polymer-polymer mixtures

    Takashi Ohnaga, Junko Maruta, Takashi Inoue

    Polymer   30 ( 10 )   1845 - 1850   1989.10

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0032-3861(89)90356-X

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  • LCST-type phase behaviour and extremely slow demixing phenomenon in polymer blends of poly(acrylonitrile-co-styrene) and poly(maleic anhydride-co-styrene)

    Junko Maruta, Toshiaki Ougizawa, Takashi Inoue

    Polymer   29 ( 11 )   2056 - 2060   1988.11

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0032-3861(88)90180-2

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MISC

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Research Projects

  • 走査型ナノ・マイクロ熱拡散率顕微鏡の開発と高分子系複合材料の熱界面イメージング

    Grant number：26K01228  2026.4 - 2030.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    森川 淳子

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    Grant amount：\18070000 （ Direct Cost: \13900000 、 Indirect Cost：\4170000 ）

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  • 超局所領域熱拡散率測定法の開拓と高分子階層構造における熱伝導の学理解明

    Grant number：23K23405  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    森川 淳子, 五十幡 康弘, 後藤 仁志, 高見澤 聡, 劉 芽久哉

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    Grant amount：\17030000 （ Direct Cost: \13100000 、 Indirect Cost：\3930000 ）

    ソフトマテリアルは、限られた種類の原子から構成されながら、多彩な化合物を形成し、分子間の多様な相互作用によって複雑で階層的な高次構造を発現する。特に熱伝導特性においては、分子形状と分子間相互作用によって支配された異方的な熱伝達場の発現と、高次構造との相関が重要である。この異方的な熱伝導性と構造制御性という二つの特徴から、ソフトマテリアルは動的に熱伝導の指向性を制御可能なフレキシブルな熱機能材料としての応用が期待されている。本研究では、開発した局所領域測定用温度センサーを利用したミクロスケール温度波熱分析法（μ-TWA）を用いて、3軸の有機単結晶熱拡散率測定により、異方的な構造配置と熱拡散率の違い、および弾性変形における力学的挙動との間に相関関係を見出した。超弾性共結晶では強い分子間相互作用と弱い分子間相互作用の組み合わせによって、強弾性共結晶では弱い相互作用のみによって、変形の程度に違いが見られた。この比較において、超弾性共晶は強弾性共晶よりも高い熱拡散率を示し、これは超弾性共晶に対称的で比較的強固な分子間相互作用が存在することを示している。
    一方、厚さ50nmまたは150nmの窒化シリコン(SiNx)薄膜上に形成した、ライン状またはスパイラル状の温度センサーアレイからなるデバイスを開発し、空気中および真空中のSiNx膜の面内熱拡散率を測定するロックインフォトサーマル法に適用した。ナノ薄膜上の2次元熱拡散は周辺環境との熱交換だけでなく、膜表面に沿った空気中の熱伝導による平行熱拡散の影響を受けることがわかった。

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  • 超局所領域熱拡散率測定法の開拓と高分子階層構造における熱伝導の学理解明

    Grant number：22H02137  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    森川 淳子, 劉 芽久哉, 高見澤 聡, 後藤 仁志

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    Grant amount：\17030000 （ Direct Cost: \13100000 、 Indirect Cost：\3930000 ）

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  • Precise measurement of thermo-hysical properties of softcrystals and basic study on phase transition by thermo-spectroscopy

    Grant number：20H04663  2020.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Grant amount：\5330000 （ Direct Cost: \4100000 、 Indirect Cost：\1230000 ）

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  • 高分子の熱物性マテリアルズインフォマティクス

    2019 - 2024

    科学技術振興機構  戦略的な研究開発の推進 戦略的創造研究推進事業 CREST 

    森川 淳子

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    「高分子の熱伝導」をテーマとし、計測・合成・量子化学計算・デバイス開発から創出されるミクロ・ナノスケールの新規熱物性データと、機械学習・計算科学に基づくマテリアルズインフォマティクスを融合することで、従来のデータベースでは乗り越えられなかった高分子物性の予測の壁を越えることを目指します。構築した学術基盤に基くデータベース、ソフトウェアをコモンソースとして社会に還元し、新規材料を提案します。

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    J-GLOBAL

  • ソフトクリスタルの熱的特性精密測定と熱・分光イメージングによる熱応答制御

    Grant number：18H04506  2018.4 - 2020.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    森川 淳子

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    Grant amount：\5070000 （ Direct Cost: \3900000 、 Indirect Cost：\1170000 ）

    本研究では，従来測定が難しかったソフトクリスタルのミクロスケール熱物性について，測定法開発に基づき，外場（光・温度・力学場等）応答による動的過程を温度波を用いて測定することで，ソフトクリスタルのもつ新たな熱物性機能を開拓し，さらなる新規ソフトクリスタルの創製を目指した．①せん断応力場，②励起光照射，③温度クエンチ各条件にて，①有機超弾性結晶，②量子ドット，③ハイドロゲル，④配位高分子，⑤結晶異性体による化学発光，⑥アンフィダイナミック結晶について，ミクロ・ナノスケール熱拡散率測定装置を試作し，各々熱物性の特徴を得た．
    配位高分子ミクロ単結晶の測定では，ハロゲン原子，有機配位子の種類と熱拡散率に相関があることを見い出し，配位高分子の化学構造設計による熱伝導特性の制御の可能性を示した．金属イオンにハロゲン化銅，配位分子にジチオカルバミン酸誘導体を用いた1次元ネットワーク構造を有する配位高分子結晶では，結晶の各面に垂直な3方向の熱拡散率を測定し，一次元配位結合ネットワークの主鎖方向である結晶a軸方向の熱拡散率が他の方向の熱拡散率に比べ2~3割程度大きい可能性を得た．2次元配位結合ネットワークを有する配位高分子単結晶では，誘電率異常を示す相転移付近の熱拡散率変化も示唆され，導電性があり力学的強度の低いミクロスケール単結晶測定における温度波法の有用性を確認した．一方，超弾性を示す有機単結晶を用いて，応力を外場とした熱拡散率制御が可能であることを，相転移過程での熱拡散率変化を実測することで示した．有機単結晶を用いた熱拡散率制御は，ネマチック液晶を用いた系と同等の応答速度を持っており，より熱伝導率が高い領域での動的な熱伝導性制御が可能である．また，レーザー光交流型照射によるフォトサーマル法も導入し，ミクロサイズ単結晶の迅速な熱物性計測の端緒を開いた．

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  • Thermal properties of polymer composite analyzed with multi-spectrum thermal imaging method

    Grant number：16K06768  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Morikawa Junko, Ryu Meguya

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    Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）

    The measurement system of thermo-spectroscopy has been developed to obtain infrared thermographical image and Infrared spectroscopic image in microscale simultaneously. In order to estimate the absolute temperature, the thermal emission signal intensity at each temperature and each concentration need to be measured prior to the experiments as a calibration procedure, since the emissivity is directly depending on the concentration and temperature of each component. The developed system was applied to analyze the temperature distribution in the kinetic thermal phenomena such as the phase transition of the heat storage materials and the chemical reaction system such as the styrene radical polymerization. The anisotropic thermal diffusivity in the in-plane direction of polymer composite was also estimated using the photo-thermal method.

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  • 情報統合型物質・材料開発イニシアティブ 伝熱制御・高熱伝導高分子に関する研究

    2015.8 - 2020.3

    JST  情報統合型物質・材料開発イニシアティブ 

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  • 「高温太陽熱供給システム」「高温熱貯蔵のための化学蓄熱材料と蓄熱装置の開発」

    2014.7 - 2018.3

    JST  SIP「エネルギーキャリア」 

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    Authorship：Coinvestigator(s) 

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  • Thermal design of polymer materials specified on heat transport properties

    Grant number：25420752  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Junko Morikawa

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    Grant amount：\4940000 （ Direct Cost: \3800000 、 Indirect Cost：\1140000 ）

    Temperature wave method applicable to thin and small specimens was utilized for the measurement of various kinds of model materials, such as polymeric composites, liquid crystals, phase change materials, etc., in order to understand the general principles of thermal design to control the high performance thermal properties. It was shown that the molecular anisotropy was controllable to enhance the higher thermal conductive properties.At the same time, the method of simultaneous measurement of thermal and spectral IR images is proposed, applying to the imaging of phase transition of n-alkane.

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  • 赤外線カメラを用いた二次元可視化熱分析用ソフトウェアの開発

    2009 - 2011

    科学技術振興機構  産学が連携した研究開発成果の展開 研究成果展開事業 先端計測分析技術・機器開発プログラム 一般領域 ソフトウエア開発タイプ 

    森川 淳子

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    これまでに赤外線カメラを温度センサーに用いた熱伝導率測定装置並びに二次元示差熱分析装置を開発してきました。温度画像を高速で得られるメリットを生かし、顕微レンズを用いることで微小試料について、従来にはない高感度熱量変化測定と熱の移動の様子が同時に観測できます。本装置を実用化するためには、データの取り込みと画像処理が迅速であること、各種の物性値に換算できること、安価なカメラにも適用できることなどが必要です。本課題では、可視化熱分析装置として、材料開発の現場で使用されるような安価で操作性の良い装置の完成を目標としたプログラムの開発を行います。

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  • Development of measuring system of thermal interface of composite materials by IR thermal camera

    Grant number：17360331  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HASHIMOTO Toshimasa, MORIKWA Junko

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    Grant amount：\15600000 （ Direct Cost: \15600000 ）

    A new measuring system by using a high-speed infrared focal plane array (InSb) and an IR linear sensor array (MCT) was developed for the analysis of thermal interface and the microscopic visual two dimensional thermal analysis including the method for the measurement of thermal diffusivity in a plane. The advantage of this technique is ; (i) high-speed measurement, (ii) non-contact, (iii) two dimensional (2D) image, (iv) micro-scale spatial resolution, and (v) a direct observation of thermal interface.
    The two dimensional high speed image of temperature distribution at a microscopic level is taken in a heating I cooling temperature scan and the temperature-time profiles of 65,000 picture elements are obtained at the same time. The potentials for the observation of instantaneous latent heat and the phase shift measurement with a.c. technique were examined..
    The measurement of thermal wave propagating in the cross section of multi-layered composite materials including the thermal interfaces was performed by edge view observation of IR thermographs analyzed by the Fourier- transformed phase image. The phase jumps observed experimentally, indicated the presence of a thermal boundary resistance between each layer. This effect has been modelled by introducing thin surface skins of poor conductors (air, grease) among the layers. The numerical analysis allowed estimating the thickness of these skin layers of less than 3μm.

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  • Thermally anisotropic materials with controlled micro-interface

    Grant number：15560595  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    MORIKAWA Junko

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    Grant amount：\4000000 （ Direct Cost: \4000000 ）

    A methodology for the measurement of thermal diffusivity and thermal conductivity at the micro-scale interface of multi-layered materials were proposed by use of a temperature wave analysis and a high-speed micro-scale focal plane arrays. The advantage of this technique stands on the two-dimensional visual information with the more than ten thousands pixels of focal plane arrays of IR sensitive photo sensor. This method is applicable not only to determine the value of thermal conductivity or diffusivity but also to observe the two-dimensional anisotropy of thermal property of the materials.
    In this study the technique was applied to the observation of thermal resistance at the interface of the multi-layer polymer films by using a temperature wave. This is a quite new application of infrared photographs to the quantification of thermal interface with a combination of a high speed IR-FPA with a microscopic lens. It visualized a phase image by inputting a temperature wave. The two-dimensional phase lock-in technique was applied to the evaluation of phase delay at the thermal interface with a spatial resolution of 7.5μm. At the positions of the first and the second interfaces between the polyimide films, for example, a large dropping down of the phase was observed, that was originated from the thermal resistance to the propagation of temperature wave in the thickness direction and a grease compound made it decreased. The relationship between the thermal conductivity of the grease compound and the phase shift at the interface was examined by the phase shift at the interface.
    As an example, thermal diffusivity of electric polarized bi-axially stretched poly(ethylene terephthalate)(PET) films was measured by temperature wave analysis and its relationship with the structure and conformation was assessed by Fourier transform infrared(FTIR). Electric field in the thickness direction of the specimen up to 950 kV/cm was applied during heating and cooling treatment from 28 to 100℃. An orientation function was calculated from dichroic ratio of 1719 cm^<-1> band which is assigned to a permanent dipole of>C=O, shows an increasing orientation with the increase of polarization field. Thermal diffusivity of stretched PET film increases up to the duplicate value with the 950KV/cm impression. The possibility of controlling the thermal diffusivity by the electric polarization of side chains in the ordered state was clearly shown.

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  • ISO高分子材料の熱特性評価試験法の標準化

    2003

    日本規格協会 

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    Authorship：Coinvestigator(s) 

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  • 戦略的ISO高分子材料の熱特性評価試験法の標準化（日本化学工業会）

    1999 - 2001

    日本化学工業会  戦略的ISO 

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    Authorship：Coinvestigator(s) 

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  • 多相交流温度波による高分子の熱拡散率・熱伝導率・比熱・潜熱同時測定装置の開発

    Grant number：09750987  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    森川 淳子

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    多相交流温度波およびパルス温度波印加による交流温度波熱分析法をフーリエ変換を用いて複数の周波数で同時に熱物性測定可能な装置として発展させ、交流温度波による周波数依存型熱分析の提案および高分子の成形加工過程の解析における周波数測定の優位性を考察するとともに、紙等の多孔性材料への応用についても検討した。
    1. 本検討の遂行にあたり下記の測定技術を導入した.
    (1) 初年度の研究遂行の結果可能となった比熱同時測定の精度をより向上させるため、交流温度波の入力振幅を計測するためのデジタル・マルチメータ(HP34401A)を設備備品として導入した。
    (2) 温度制御に関わるノイズの低減化のため、非接触式の集光型温度制御装置やブリッジ回路の試作検証を行い、これらの方法がノイズの低減化には有効であることを確認した。
    2. 得られた成果を下記に示す.
    (1) ポリスチレン、ポリエチレンなど代表的な高分子材料のガラス転移あるいは融解・結晶化に本測定法を応用し、熱物性値の変化を温度・周波数の関数として同時測定することに成功し、特にガラス転移においては周波数分散が明瞭に認められた。(論文1にて発表)
    (2) 本測定法の特徴は薄膜の測定に適するものであるが、この方法を機能性紙を含む紙材料に適用したところ多孔体であるにもかかわらず、熱拡散率、熱伝導率の精度よい測定が可能であった。本測定法は広範な材料について詳細な熱物性を与える手段として有効であることが示された。(論文2にて発表)
    3. 上記成果により,交流温度波またはパルス温度波の伝搬解析から同時に複数の周波数における高精度な熱物性測定の可能性が示された。これは断熱材のような熱物性に関する材料の設計への応用のみならず、高分子基礎物理学においても新たな知見を与えるものであると考えられる。

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  • パルス温度波を用いた交流通電加熱法による高分子の熱拡散率測定装置の開発

    Grant number：08751038  1996

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    森川 淳子

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    Grant amount：\1100000 （ Direct Cost: \1100000 ）

    交流温度波ならびにパルス温度波を用いた新規温度波熱分析(Temperature Wave Analysis)システムによる熱拡散率測定法を構築し,交流温度波による周波数依存型熱分析の提案および実際の高分子の成形加工に応用する場合の速度-周波数の相関について検討した.本検討の遂行にあたり下記の測定技術を導入した.
    1)パルス温度波の高調波成分の微弱な信号を増幅するためロックインアンプに加えて入力トランスおよびプリアンプを導入した.
    2)赤外線加熱炉を導入し非接触高速昇降温,瞬間加熱冷却下の測定を可能とした.
    3)高精度多点温度計を導入し,より精密な温度計測下の測定を可能とした.
    得られた成果を下記に示す.
    1)IC封止材の硬化過程の熱拡散率変化を反応の初期段階から実測することに成功し反応時間と成形加工時間との関連を明らかにするとともに,熱拡散率の変化の過程が2段階にわたることを初めて見出した.
    2)高分子のガラス転移における熱拡散率の周波数分散を交流温度波により求めることに成功し複素熱拡散率の概念を提案するとともに走査速度と周波数の関係を数学的に明らかにした.
    3)パルス温度波の高調波成分の同時測定が可能であることをサファイアを用いて実証しかつまた高分子のガラス転移の解析に応用した.
    上記成果により,交流温度波またはパルス温度波により複数の周波数における温度波伝搬の同時測定が可能となり高分子およびその複合系の相転移あるいは硬化反応における熱拡散率の周波数分散について新たな知見を得ることが可能となった.

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  • 交流通電加熱法による高分子の熱拡散率測定法の開発

    Grant number：07750989  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    森川 淳子

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    Grant amount：\1100000 （ Direct Cost: \1100000 ）

    高分子の成形加工過程において熱の制御は重要な問題である。しかしながら高分子の溶融温度域ならびに1次転移に対応する実用温度範囲における熱拡散率の測定は原理的に困難な場合が多く測定例は少ないのが実状であった。本研究では 原理的に全く新しい測定法として 交流温度波を用いた高分子の熱拡散率測定法を提案し かつまた1次転移における潜熱を同時に測定するシステムを開発した。
    (1)測定システムは 正弦波発信器、2位相型ロックイン増幅器、直流増幅器、温度制御器、温度計測器、ヒ-タブロックおよびパソコンから構成した。交流温度波ならびに潜熱を検知するセンサーとして金薄膜抵抗を用い その抵抗変化を電圧変化に換算して 交流成分と直流成分それぞれを増幅して検出する方法をとった。直流成分の検出にはDTAの原理を利用してリファレンスを用いた直流ブリッジ回路を作成した。試料の温度計測には 金薄膜抵抗の抵抗変化を利用するとともに熱電対素線による多点測定を行った。またヒーターブロックの温度制御には交流ノイズを避けるため直流制御を行った。測定に供する試料は1mmx4mmx50μmと微少であることもまた特徴のひとつである。
    (2)上記測定システムにより等速昇降温過程における熱拡散率およびDTAの同時測定が可能となった。金薄膜センサーの抵抗変化を同時に交流、直流成分に分割して測定するため、特に結晶性高分子の融解、結晶化における潜熱発生下での熱の拡散現象を詳細に観測することが可能となった。具体的にはPP,PE,PET等について室温から300℃までの温度範囲で等速昇降温過程における交流温度波の振幅、位相遅れ およびDTAによる潜熱の発生を同時に観測した。交流温度波と潜熱はそれぞれ独立に観測されるが 周波数が低く(kd〜1)、昇降温速度が速い(〜10℃/min)場合は 発生した潜熱が熱拡散に影響を及ぼすことがわかった。

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