研究者業績
Profile Information
- Affiliation
- University of Hyogo
- Degree
- Ph.D(Mar, 2009, Tokyo Institute of Technology)
- J-GLOBAL ID
- 201801018251558684
- researchmap Member ID
- B000299913
Research Areas
1Papers
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Liquid Crystals XXVIII, 8-8, Sep 30, 2024
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Langmuir, 40(29) 15271-15280, Jul 11, 2024 Peer-reviewed
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Polymers, 15(6) 1408-1408, Mar 12, 2023Copolymer films of photoalignable liquid crystalline (LC) copolymethacrylates comprised of a phenyl benzoate mesogen connected with N-benzylideneaniline end moiety (NBA2) and benzoic acid (BA) side groups exhibit a photoinduced reorientation behavior. Significant thermally stimulated molecular reorientation attains a dichroism (D) greater than 0.7 for all copolymer films and a birefringence of 0.113–0.181. In situ thermal hydrolysis of the oriented NBA2 groups decreases the birefringence to 0.111–0.128. However, the oriented structures of the film are maintained, demonstrating a photo-durability, even though the NBA2 side groups photo-react. The hydrolyzed oriented films show higher photo-durability without changing their optical properties.
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2022 29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD), 132-135, Jul 5, 2022 Peer-reviewed
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Molecular Crystals and Liquid Crystals, 676(1) 2-8, Nov 22, 2018Photoinduced reorientation of composite films of liquid crystalline polymethacrylate comprised of benzoic acid (BA) side groups with different length alkylene spacer (PnBAM n = 2, 6, 10) and N-benzylideneaniline carboxylic acid (NBA) is investigated using linearly polarized (LP) 365 nm light. Significant thermally stimulated in-plane molecular orientation is attained when P6BAM (n = 6) is used, but higher amount of NBA is required for the in-plane reorientation of P2BAM (n = 2) films and out-of-plane motion of the BA side groups is observed for P10BAM (n = 10) films.
Misc.
13-
Journal of Photopolymer Science and Technology, 32 549-552, Jan 1, 2019© 2019 SPST. Homogeneously aligned liquid crystal (LC) cell was fabricated using nematic LCs (NLCs) doped with a polymerizable monomer comprising of photocrosslinkable mesogenic side groups, combined with the linearly polarized UV light exposure at elevated temperature. We have clarified that the photosensitive layer forms on the substrates via the thermal polymerization, followed by generating the NLC photoalignment based on the axis-selective photocrosslinking. The LC characteristics of the photosensitive side groups of the polymerizable material play an important role in the defect-free alignment for the NLCs.
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Meeting abstracts of the Physical Society of Japan, 69(2) 535-535, Aug 22, 2014
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Meeting abstracts of the Physical Society of Japan, 69(1) 887-887, Mar 5, 2014
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Meeting abstracts of the Physical Society of Japan, 68(2) 811-811, Aug 26, 2013
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17(3) 152-156, Jul 25, 2013
Presentations
6-
Proceedings of Japanese Liquid Crystal Society Annual meeting, 2013, Japanese Liquid Crystal SocietyWe prepared various chromophores containing hydrogen bonding unit and investigated their change in photoluminescent properties induced by mechanical stimuli. We reported photoluminescent color and lifetime tuning of complex compound of dyes and acids.
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Proceedings of Japanese Liquid Crystal Society Annual meeting, 2013, Japanese Liquid Crystal SocietyIn this study, we synthesized new hydrogen-bonding asymmetric luminophores with different site of substitution, and evaluated their optical properties, orientation properties on hydrogen-bonding photo-alignment polymer film by UV-vis absorption spectra, fluorescent spectra, and fluorescence lifetime measurements.
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Proceedings of Japanese Liquid Crystal Society Annual meeting, 2013, Japanese Liquid Crystal SocietySchiff base compound is well known as liquid crystalline material, and photoisomerization can occur. However, photoreaction of liquid crystalline polymers (LCPs) with schiff base side group have not been investigated. In this presentation, we synthesized LCPs with schiff base side group and investigated the axis-selective photo reaction.
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Proceedings of Japanese Liquid Crystal Society Annual meeting, 2013, Japanese Liquid Crystal SocietyWe prepared novel polymethacrylates containing phenyl cyano vinyl terthiohene side chain and evaluated their mesomorphic propeties. Additionally, we synthesized oligothiophene with the same structure and explored their alignment behavior on photoaligned polymer films.
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Proceedings of Japanese Liquid Crystal Society Annual meeting, 2013, Japanese Liquid Crystal SocietyA photo-cross-linkable liquid crystalline polymer (PMCB6M) film is applicable to LC alignment layer and it is important to investigate reorientation behavior at the near surface of reoriented PMCB6M film. In this study, reorientation behavior of PMCB6M film in bulk and at near surface was performed by UV-vis spectroscopy and NEXAFS.