Prof. Jun Yamamoto Profile

Prof. Jun Yamamoto

Professor at Kyoto Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (8)

PROCEEDINGS ARTICLE | September 19, 2017

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

Proc. SPIE. 10361, Liquid Crystals XXI

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

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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 | April 21, 2017

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

Proc. SPIE. 10125, Emerging Liquid Crystal Technologies XII

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

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PROCEEDINGS ARTICLE | March 23, 2016

Solvent effect on columnar formation in solar-cell geometry

Proc. SPIE. 9769, Emerging Liquid Crystal Technologies XI

KEYWORDS: Nanostructuring, Organic light emitting diodes, Glasses, Solar cells, Molecules, Crystals, Optical microscopy, Atomic force microscopy, Optoelectronics, Optoelectronic devices, Liquid crystals, Optical alignment, Nanolithography, Molecular self-assembly, Molecular assembly, Nanowires

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PROCEEDINGS ARTICLE | October 5, 2015

Study of liquid crystal formation of graphene oxide flakes (Withdrawal Notice)

Proc. SPIE. 9565, Liquid Crystals XIX

KEYWORDS: Oxides, Graphene, Liquid crystals, Current controlled current source

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PROCEEDINGS ARTICLE | August 20, 2015

Self-assembling of molecular nanowires for enhancing the conducting properties of discotic liquid crystals

Proc. SPIE. 9558, Nanostructured Thin Films VIII

KEYWORDS: Thin films, Electrodes, Molecules, Doping, Atomic force microscopy, Organic materials, Iodine, Liquid crystals, Molecular self-assembly, Nanowires

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PROCEEDINGS ARTICLE | March 11, 2015

Dynamic and complex optical patterns from colloids of cholesteric liquid crystal droplets

Proc. SPIE. 9384, Emerging Liquid Crystal Technologies X

KEYWORDS: Visible radiation, Optical properties, Capillaries, Crystals, Physics, Photonic crystals, Liquid crystals, Data centers, Spectrophotometry, Spherical lenses

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PROCEEDINGS ARTICLE | February 19, 2014

Effects of carbon nanotubes on a very low surfactant concentration lyotropic liquid crystal host

Proc. SPIE. 9004, Emerging Liquid Crystal Technologies IX

KEYWORDS: Birefringence, Nanoparticles, Capillaries, Molecules, Crystals, Composites, Optical microscopy, Polarizers, Liquid crystals, Carbon nanotubes

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PROCEEDINGS ARTICLE | February 8, 2012

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

Proc. SPIE. 8279, Emerging Liquid Crystal Technologies VII

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

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Showing 5 of 8 publications

Conference Committee Involvement (2)

Emerging Liquid Crystal Technologies XIV

2 February 2019 | San Francisco, California, United States

Emerging Liquid Crystal Technologies XIII

29 January 2018 | San Francisco, California, United States

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