担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

DOI： 10.1021/acs.jpclett.5c00354

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

Liquid crystals (LCs) are unique heat transfer media that exhibit large anisotropy in thermal properties depending on the direction of the director (n) of the LC state. This phenomenon is the basis of thermal conduction in ordered soft materials, and has been extensively studied to understand thermal conduction in soft materials. In this study, we used inelastic x-ray scattering (IXS) to investigate the anisotropic thermal diffusivity and collective dynamics in the terahertz region of a pyrimidine-type LC (PYP8O8). The dispersion relations at several frequencies corresponding to the LC state were analyzed in the directions parallel and perpendicular to n. The results showed that there was a significant difference between the anisotropy of the sound velocity and that of the attenuation coefficient (Γ) estimated from the shape parameter of the IXS spectrum. The results for the linewidth of inelastic excitation show Q2 dependence that is far beyond the viscoelastic relaxation of the system, and the anisotropy in the collective dynamics predicted by Forster . [] in the hydrodynamic region can be extensively applied to the more localized collective motion of LC systems.

DOI： 10.1103/physreve.111.015432

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevE.111.015432/fulltext

掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

DOI： 10.1021/jacs.4c11849

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掲載種別：研究論文（学術雑誌）   出版者・発行元：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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その他リンク： https://link.springer.com/article/10.1007/s00340-024-08280-3/fulltext.html

掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：SPIE  

DOI： 10.1117/12.3014081

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出版者・発行元：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 modified the S-state upon reflection. Here, we demonstrate polarimetry for the determination of surface anisotropies related to birefringence and dichroism from different materials, which have a common feature of linear patterns of different alignments and scales. It is shown that polarimetry in the back-reflected light is complementary to ellipsometry and four-polarisation camera imaging.

DOI： 10.20944/preprints202404.1816.v1

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掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：MDPI  

DOI： 10.3390/engproc2023051039

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Royal Society of Chemistry (RSC)  

Although the finding of superelasticity and ferroelasticity in organic crystals has been serendipitous, an increasing number of organic crystals with such deformation properties have been witnessed. Understanding the structure-property relationship can aid in the rational selection of intermolecular interactions to design organic crystals with desired superelastic or ferroelastic properties. In this study, we investigated the mechanical deformation in two cocrystals, prepared with the parent compound, 1,4-diiodotetrafluorobenzene with two coformers, 1,2-bis(4-pyridyl)ethane and pyrene. The parent compound and coformers were chosen to introduce distinct weak interactions such as halogen bonds and C-H⋯F, and π⋯π interactions in the crystal structure. The two cocrystals exhibited different mechanical deformations, superelasticity, and ferroelasticity, respectively. The single-crystal X-ray diffraction and energy framework analysis of the crystal structure of the cocrystals revealed that both deformations were caused by mechanical twinning. Interestingly, a difference in the extent of deformation was observed, modulated by a combination of strong and weak intermolecular interactions in the superelastic cocrystal, and only weak interaction in the ferroelastic one. In this comparison, the superelastic cocrystal exhibited higher thermal diffusivity than the ferroelastic cocrystal, indicating the presence of symmetrical and relatively robust intermolecular interactions in the superelastic cocrystal.

DOI： 10.1039/d3sc03155a

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

A two-directional ferroelastic deformation in organic crystals is unprecedented owing to its anisotropic crystal packing, in contrast to isotropic symmetrical packing in inorganic compounds and polymers. Thereby, finding and constructing multidirectional ferroelastic deformations in organic compounds is undoubtedly complex and at once calls for deep comprehension. Herein, we demonstrate the first example of a two-directional ferroelastic deformation with a unique scissor-like movement in single crystals of trans-3-hexenedioic acid by the application of uniaxial compression stress. A detailed structural investigation of the mechanical deformation at the macroscopic and microscopic levels by three distinct force measurement techniques (including shear and three-point bending test), single crystal X-ray diffraction techniques, and polarized synchrotron-FTIR microspectroscopy highlighted that mechanical twinning promoted the deformation. The presence of two crystallographically equivalent faces and the herringbone arrangement promoted the two-directional ferroelastic deformation. In addition, anisotropic heat transfer properties in the parent and the deformed domains were investigated by thermal diffusivity measurement on all three axes using microscale temperature-wave analysis (μ-TWA). A correlation between the anisotropic structural arrangement and the difference in thermal diffusivity and mechanical behavior in the two-directional organoferroelastic deformation could be established. The structural and molecular level information from this two-directional ferroelastic deformation would lead to a more profound understanding of the structure-property relationship in multidirectional deformation in organic crystals.

DOI： 10.1021/jacs.3c05545

PubMed

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掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

DOI： 10.1021/jacs.3c07921

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掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

A four-polarisation camera was used to map the absorbance of olivine micro-grains before and after high-temperature annealing (HTA). It is shown that HTA of olivine xenoliths at above 1200 °C in O2 flow makes them magnetised. Different modes of operation of the polariscope with polarisation control before and after the sample in transmission and reflection modes were used. The reflection type was assembled for non-transparent samples of olivine after HTA. The sample for optical observation in transmission was placed on an achromatic, plastic, quarter-wavelength waveplate as a sample holder. Inspection of the sample’s birefringence (retardance), as well as absorbance, was undertaken. The best fit for the transmitted intensity or transmittance T (hence, absorbance A=−log10T) is obtainable using a simple best fit with only three orientations (from the four orientations measured by the camera). When the intensity of transmitted light at one of the orientations is very low due to a cross-polarised condition (polariser–analyser arrangement), the three-point fit can be used. The three-point fit in transmission and reflection modes was validated for T(θ)=Amp×cos(2θ−2θshift)+offset, where the amplitude Amp, offset offset, and orientation azimuth θshift were extracted for each pixel via the best fit.

DOI： 10.3390/coatings13091640

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：AIP Publishing  

A device consisting of a line- or spiral-shaped temperature sensor array on a two-dimensional (2D) silicon nitride (SiNx) membrane of thickness 50 or 150 nm is developed for use in the lock-in photothermal method to determine the in-plane thermal diffusivity of SiNx membranes in air and in vacuum. The results of 2D heat diffusion are analyzed by the quadrupole method, and the system is approximated to the one-dimensional (1D) fin standing in a surrounding media (the fin approximation). The results show that 2D thermal diffusion on the membrane is affected not only by heat exchange with the surrounding environment but also by parallel thermal diffusion caused by heat conduction in the air along the membrane surface. The measurement using photothermal heating and contact detection of the temperature response enables the phenomenon to be detected consistently at a wide frequency range of temperature waves (50–1000 Hz). The measured thermal diffusivity values of the SiNx membrane are much smaller than those of bulk material, which can be reasonably considered an effect of the confined state of the phonon in the nanoscale geometry of the membrane.

DOI： 10.1063/5.0160602

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掲載種別：研究論文（学術雑誌）   出版者・発行元：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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その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/00037028231180233

掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)  

Abstract

Heating crystal samples of 9,10-diphenylanthracene endoperoxide (1) and its deuterated derivative (1-d10) to 200 °C led to singlet-oxygen chemiluminescence (CL) from the mixtures of the crystalline and molten states. To understand the events in the heated samples, the reactions of 1 and 1-d10 in crystals were investigated by powder X-ray diffraction measurements and thermal analyses. The used crystals of 1 and 1-d10 obtained from a mixture of ethyl acetate (EA) and n-hexane contained EA. Other crystals of 1 obtained by slow recrystallization with the same solvents had a solvent-free structure (form II) different from the reported one (form I). The results confirmed that the EA-containing crystals of 1 and 1-d10 were transformed to form II in two steps at 40–50 and 60–75 °C under heating at elevated temperature. Thus, the crystal samples had the form-II structure soon after heating to 200 °C. The behavior of the heated samples indicates that the crystal lattice inhibits the thermal reactivity of 1. Thus, the temperature for initiating the thermolytic reaction of 1 becomes higher than the melting point. An exploration of the potential energy surface (PES) obtained by density functional theory (DFT) calculations also supports that the deoxygenation of 1 is prevented by retaining the anthracene framework in the crystalline state. This study indicates that the method to use a CL-active compound is a powerful tool to analyze the reaction behavior in the crystalline state.

DOI： 10.1246/bcsj.20230121

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出版者・発行元：MDPI AG  

In this perspective, we give an overview of several less explored structural and optical characterisation techniques useful for biomaterials. New insights into the structure of natural fibres such as spider silk can be gained with minimal sample preparation. Electromagnetic radiation (EMR) over a broad range of wavelengths (from X-ray to THz) provides information of the structure of the material at cor- respondingly different length scales (nm-to-mm). When the sample features, such as the alignment of certain fibres, cannot be characterised optically, polarisation analysis of the optical images can provide further information on feature alignment. The 3D complexity of biological samples necessitates that there be feature measure- ments and characterisation over a large range of length scales. We discuss the issue of characterising complex shapes by analysis of the link between the color and struc- ture of spider scales and silk. For example, it is shown that the green-blue color of a spider scale is dominated by the chitin slab’s Fabry-P ́erot type reflectivity rather than the surface nanostructure. The use of a chromaticity plot simplifies complex spectra and enables quantification of the apparent colors. All the experimental data presented herein are used to support the discussion on the structure-color link in the characterisation of materials.

DOI： 10.20944/preprints202305.0246.v1

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出版者・発行元：MDPI AG  

Microlens arrays (MLAs) which are increasingly popular micro-optical elements in compact integrated optical systems were fabricated by femtosecond direct laser write (fs-DLW) technique in the low-shrinkage SZ2080TM photoresist. High fidelity definition of 3D surfaces on IR transparent CaF2 substrates allowed to achieve ∼ 50% transmittance at chemical fingerprinting spectral region 2-5 μm wavelengths since MLAs were only ∼ 10 μm high corresponding to the numerical aperture of 0.3 (the lens height is comparable with the IR wavelength). To combine diffractive and refractive capabilities in miniaturised optical setup, a graphene oxide (GO) grating acting as a linear polariser was also fabricated by fs-DLW by ablation of a 1 μm-thick GO thin film. Such an ultra-thin GO polariser can be integrated with the fabricated MLA to add dispersion control at the focal plane. Pairs of MLAs and GO polarisers were characterised throughout visible-IR spectral window and numerical modeling was used to simulate their performance. Good match between experimental results of MLA focusing and simulations was achieved.

DOI： 10.20944/preprints202303.0106.v1

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/mi14040798

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

Abstract

The birefringence analysis of thin m SiO₂ films deposited via evaporation at a glancing angle of to the normal on resist pillar arrays on Si and nanopatterned SiO₂ substrates is carried out by spectral and color (red–green–blue [RGB]) imaging modes. Retardance and birefringence of the films deposited over flat and structured regions can be distinguished with only ≈1% difference between neighboring regions for the visible spectral range using RGB numerical analysis of images. The Michel‐Lévy color map is used for color rendering of birefringence to make quantitative measurements by numerical RGB color filtering. It is shown that by using at 530 nm waveplate inserted at angle to the cross polarizer‐analyzer setup, the range of changes in chromaticity xy‐coordinates expands approximately twice upon angular rotation of a birefringent sample. This facilitates a better signal‐to‐noise determination of birefringence. The proposed method with ‐plate color shifting can be directly used to determine birefringence from step‐like spectral features in reflection and transmission polariscopy. Direct measurement of birefringence () and retardance of SiO₂ chevron film is carried out using Berek compensator as a benchmark.

DOI： 10.1002/lpor.202200535

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lpor.202200535

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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その他リンク： https://www.nature.com/articles/s41467-022-32865-1

掲載種別：研究論文（学術雑誌）   出版者・発行元：{MDPI} {AG}  

DOI： 10.3390/mi13081170

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

It has been found that a fluorophore-linked adamantylideneadamantane 1,2-dioxetane derivative showed an isomeric difference in the reactivities of crystalline-state chemiluminescence (CL) under isothermal heating conditions, while there are still unsolved problems on the conditions for intracrystalline reactions. To confirm the suitable heating conditions for initiating crystalline-state CL reactions of the isomers, the CL reactions in their crystal samples heated at elevated temperature were investigated with monitoring of CL light emission and thermogravimetry-differential thermal analysis (TG-DTA) measurements together with a simultaneous measurement method of thermal diffusivity and light emission, to provide the information on suitable temperature range for the crystalline-state CL reactions and on the reactivities depending on open and closed conditions of the crystal samples. The newly developed simultaneous measurement method provides a methodology for a single crystal to analyze the relationship between a change of the thermophysical property of inside of the crystal and the progress of a crystalline-state CL reaction.

DOI： 10.1007/s44211-022-00118-2

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：{AIP} Publishing  

DOI： 10.1063/5.0084891

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Chemical Society of Japan  

DOI： 10.1246/bcsj.20210445

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：AIP Publishing  

Thermal diffusivity during stress-induced phase transition was examined and precisely determined in terephthalamide, an organosuperelastic soft crystal. A 14% maximum change in thermal diffusivity was realized in a superelastic phase transformation at a shear stress below 0.5 MPa. Thermal diffusivity measurements under the crystal deformation were achieved using microscale photothermal temperature-wave analysis. A maximum fivefold anisotropy was found in the thermal diffusivity between the c axis and other crystal axes. The results indicate the potential for developing practical thermal applications of organosuperelastic single crystals.

DOI： 10.1063/5.0055707

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/nano11123247

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

DOI： 10.3390/app11167632

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jacs.1c03588

Scopus

PubMed

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掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

DOI： 10.1149/MA2021-0115697mtgabs

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掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

DOI： 10.1149/MA2021-0115699mtgabs

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

To control thermal properties in nano- and micro scale is one of the important topics with regards to the phonon engineering. Recently, the mechanical molecular crystals have been developed, which have the potential applications of actuators and soft robots. Most of the crystal motions are induced by photoisomerization or mechanical stress.

Thermal phase transition and the photothermal effect are considered as the underlying mechanism for the motions, such as bending, twisting, jumping, and rotating, etc., of the mechanical molecular crystals, called soft crystals. However, due to the lack of the measured data of heat transport properties such as thermal diffusivity or thermal conductivity of single crystals in micro volume size, the quantitative analysis of thermal phenomena in the molecular crystals has not yet been quantitatively analyzed. For example, the photo-thermally induced temperature rise produces the localized temperature distribution near the surface, and thermal diffusivity should be utilized to calculate the temperature distribution in the specimen.

To overcome such situation, we propose a micro scale temperature wave analysis (micro-TWA) method to measure the thermal diffusivity of soft crystals in micro scale. (Figure 1) This method enables to measure the axial orientation in single crystals. Furthermore, coupled with the photo-thermal stimulation, the kinetic measurement of thermal diffusivity under the stress induced and photo induced field has been realized. Demonstration of the super elastic phase transition of soft crystal, 3,5- difluorobenzoic acid (3,5−F2bza) and terephthalamide(TPA) will be presented.

This is a proposal of the new measurement method, because the experimental determination of the thermal diffusivity in micro scale of organic single crystals, under operating the deformation control, is still a challenge. The experimental validity is discussed with the theoretical analysis using the reference sample.



Figure 1

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DOI： 10.1149/ma2021-0115700mtgabs

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その他リンク： https://iopscience.iop.org/article/10.1149/MA2021-0115700mtgabs/pdf

掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：SPIE  

DOI： 10.1117/12.2577096

Scopus

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.matdes.2021.109475

Scopus

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

DOI： 10.3390/app11041544

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ijheatmasstransfer.2020.120337

Web of Science

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/mi11080738

Web of Science

Scopus

PubMed

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掲載種別：研究論文（学術雑誌）   出版者・発行元：{IOP} Publishing  

DOI： 10.1088/2053-1591/ab9a7e

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ppap.201900212

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1364/OE.392646

Scopus

PubMed

arXiv

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その他リンク： http://arxiv.org/pdf/2004.00120v1

掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/nano9101414

Web of Science

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掲載種別：研究論文（国際会議プロシーディングス）  

DOI： 10.1117/12.2528681

Web of Science

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担当区分：筆頭著者  

DOI： 10.20944/preprints201909.0013.v1

Web of Science

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.jpcc.9b04270

Web of Science

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/nano9050732

Web of Science

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3762/bjnano.10.93

Web of Science

arXiv

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その他リンク： https://www.beilstein-journals.org/bjnano/content/pdf/2190-4286-10-93.pdf

掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.apsusc.2018.12.121

Web of Science

arXiv

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.5066384

Web of Science

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/C9NH00340A

Web of Science

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： 10.1117/12.2551712

Web of Science

Scopus

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/1361-6463/aae3a6

Web of Science

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-018-36114-8

Web of Science

arXiv

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その他リンク： https://www.nature.com/articles/s41598-018-36114-8

掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/jbio.201800187

Web of Science

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ijadhadh.2018.01.019

Web of Science

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-018-24583-w

Web of Science

arXiv

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その他リンク： https://www.nature.com/articles/s41598-018-24583-w

担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/2040-8986/aaa6fb

Web of Science

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その他リンク： http://iopscience.iop.org/article/10.1088/2040-8986/aaa6fb/pdf

掲載種別：研究論文（学術雑誌）  

DOI： 10.1177/0003702817736320

Web of Science

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その他リンク： https://journals.sagepub.com/doi/full-xml/10.1177/0003702817736320

掲載種別：研究論文（国際会議プロシーディングス）  

DOI： 10.1364/BGPPM.2018.JTh4A.2

Scopus

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