Dr. Isa Nishiyama Profile

Dr. Isa Nishiyama

Research Chemist at Dainippon Ink and Chemicals Inc

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Publications (9)

Proceedings Article | 18 September 2018 Presentation

Slippery interfaces: control and evaluation of the anchoring effect for the reduction of driving voltage (Conference Presentation)

Jun Yamamoto, Isa Nishiyama

Proceedings Volume 10735, 107350V (2018) https://doi.org/10.1117/12.2320278

KEYWORDS: Interfaces, Liquid crystals, LCDs, Magnetism, Polymer thin films, Polymers, Electrodes, Switching, Ultrafast phenomena, Glasses

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Proceedings Article | 19 September 2017 Open Access

Nano slippery interfaces in nematic gels -localization and lubrication of director motions (Conference Presentation)

Jun Yamamoto, Isa Nishiyama

Proceedings Volume 10361, 103610B (2017) https://doi.org/10.1117/12.2273254

KEYWORDS: Interfaces, Ultraviolet radiation, Electro optics, Fast packet switching, Dynamic light scattering, Nanostructures, LCDs

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We designed the fast switching & low driving voltage principle with nano slippery interfaces in nematic gels. Confinement effect by the gel network can accelerate the response time of nematic due the localization of director motion as similar way to the cholesteric blue phase. However, the anchoring of the director on the gel network induces the driving voltage. Slippery effect on the nano interface of the gel network can reduce the driving voltage due to the lubrication of the director motion. Since azo dye acrylates are co-polymerized with nematic gels (Azo-NGel), we can demonstrate the UV-switchable nano-slippery interface on the nematic gels. Dynamic Light Scattering (DLS) provides us the information of the dynamics of director rotation. Dispersion relation of the pure 7CB-T15 mixture completely satisfies the prediction of hydrodynamic modes in the nematic. On the contrary, the relaxation frequency of the Azo-NGel keeps fast response in the low wave-number region due to the confinement effect. Electro-Optic response (EO) of the Azo-Ngel without UV illumination shows the serious increase of the driving voltage compared to the pure 7CB-T15 mixture. When the Azo-Ngel is illuminated by UV-light Slippery interfaces can be created by the trans-cis isomerization of the Azo dye of the side-chain on the nano network of nematic gels. EO under UV illumination shows the drastic reduction of the driving voltage keeping the fast response time. We have also confirmed that the dispersion relation of the UV illuminated Azo-Ngel is almost the same as that of Azo-Ngel without UV illumination by the DLS measurement. Thus, the confinement effect for the nematic gels is still effective after the slippery interface is created by the UV illumination. We success to demonstrates that the acceleration of the response time is compatible with reduction of the driving voltage by the localization and lubrication of director motions due to the design of the nano-slippery interfaces in the nematic gels.

Proceedings Article | 21 April 2017 Presentation

Slippery interfaces: lubrication of director and helix rotation motions (Conference Presentation)

Jun Yamamoto, Waki Sakatsuji, Isa Nishiyama

Proceedings Volume 10125, 101250D (2017) https://doi.org/10.1117/12.2251313

KEYWORDS: Interfaces, Liquid crystals, Polymers, Polymer thin films, LCDs, Molecules, Fast packet switching, Liquids, Glasses, Ultraviolet radiation

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Proceedings Article | 5 October 2015 Presentation

Electrical induction and optical erasure of birefringence in the isotropic liquid phase of a dichiral azobenzene liquid-crystalline compound (Presentation Recording)

Takahiro Yamamoto, Isa Nishiyama

Proceedings Volume 9565, 956508 (2015) https://doi.org/10.1117/12.2186890

KEYWORDS: Liquid crystals, Birefringence, Liquids, LCDs, Crystals, Temperature metrology, Molecules, Crystal optics, Ultraviolet radiation, Digital image correlation

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Proceedings Article | 8 February 2012 Paper

Pre-organized liquid crystals: biaxial nature of laterally-connected dimer

Isa Nishiyama, Yuka Tabe, Jun Yamamoto, Yoichi Takanishi, Yoko Ishii, Hiroshi Yokoyama

Proceedings Volume 8279, 827903 (2012) https://doi.org/10.1117/12.913573

KEYWORDS: Liquid crystals, Molecules, Birefringence, Molecular interactions, Physics, Active optics, Glasses, Thin films, Digital image correlation, Applied physics

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Proceedings Article | 12 September 2007 Paper

Super-structured smectics and their application

I. Nishiyama, T. Yamamoto, J. Yamamoto, H. Yokoyama

Proceedings Volume 6654, 66540E (2007) https://doi.org/10.1117/12.734893

KEYWORDS: Shape memory alloys, Liquid crystals, Ultraviolet radiation, X-ray diffraction, Liquids, Crystals, Solids, X-rays, Scattering, Phase shift keying

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Proceedings Article | 15 October 2004 Paper

Chirality-induced liquid-crystalline nano-structures and their properties

Isa Nishiyama, Jun Yamamoto, John Goodby, Hiroshi Yokoyama

Proceedings Volume 5518, (2004) https://doi.org/10.1117/12.563060

KEYWORDS: Scattering, Liquids, X-ray diffraction, Liquid crystals, Molecules, X-rays, Chromium, Diffraction, Solids, Temperature metrology

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Proceedings Article | 20 May 2004 Paper

Fabrication of aspherical mirrors for HiNA (high numerical aperture EUV exposure tool) set-3 projection optics

Tetsuya Oshino, Takahiro Yamamoto, Tatsuro Miyoshi, Masayuki Shiraishi, Takaharu Komiya, Noriaki Kandaka, Hiroyuki Kondo, Kiyoto Mashima, Kazushi Nomura, Katsuhiko Murakami, Hiroaki Oizumi, Isa Nishiyama, Shinji Okazaki

Proceedings Volume 5374, (2004) https://doi.org/10.1117/12.562365

KEYWORDS: Mirrors, Wavefronts, Projection systems, Spatial frequencies, Semiconducting wafers, Polishing, Extreme ultraviolet lithography, Photomasks, Mirror mounts, Reflectivity

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Proceedings Article | 5 January 2004 Paper

Molecular organization by head-to-tail recognition for polar liquid crystals

Atsushi Yoshizawa, Tsuyoshi Narumi, Harutada Dewa, Shinobu Hatai, Norihisa Araake, Isa Nishiyama, Jun Yamamoto, Hiroshi Yokoyama

Proceedings Volume 5213, (2004) https://doi.org/10.1117/12.509185

KEYWORDS: Shape memory alloys, Crystals, Liquid crystals, Binary data, Molecules, Dielectrics, Crystallography, Anisotropy, Electro optics, X-ray diffraction

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Showing 5 of 9 publications

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