54 research outputs found
Photoinduced Alignment of Photo-Cross-Linkable Side-Chain Liquid Crystalline Copolymers Comprising Cinnamoylethoxybiphenyl and Cyanobiphenyl Groups
Alignment of Photo-Cross-Linkable Copolymer Liquid Crystals Induced by Linearly Polarized Ultraviolet Irradiation and Thermal Treatment: Effect of Copolymerization Ratio. 2 1
Geometric ferroelectricity in rare-earth compounds RGaO3 and RInO3
We have studied the stability and ferroelectric properties of hexagonal RGaO3 and RInO3 (R: rare-earth elements) by first-principles calculations. Computed spontaneous polarization in the series shows a systematic increase with the rare-earth elements, with values being larger in RInO3 than in the corresponding RGaO3. The largest polarization found is about 10 μC/cm2 for ErInO3, which is about twice as large as those observed in hexagonal RMnO3. The polarization can be further increased by applying in-plane compressive stress. The Born effective charges of constituent ions in the compounds are found to be similar to their formal values, implying that the ferroelectric displacements are merely driven by the ionic size effect. A transition to the high-symmetry phase at around 1500 K was confirmed in GdInO3 and DyInO3 by in situ high-temperature powder x-ray diffractometry. The present systems should belong to the family of geometric ferroelectrics
Reversion of Alignment Direction in the Thermally Enhanced Photoorientation of Photo-Cross-Linkable Polymer Liquid Crystal Films
Fluorescence Studies of pH-Responsive Unimolecular Micelles Formed from Amphiphilic Polysulfonates Possessing Long-Chain Alkyl Carboxyl Pendants
Liquid Crystal Alignment on Photoreactive Side-Chain Liquid-Crystalline Polymer Generated by Linearly Polarized UV Light
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