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• W2012162483 abstract "We study optical, structural, and surface anchoring properties of thermotropic nematic bent-core material A131. The focus is on the features associated with orientational order as the material has been reported to exhibit not only the usual uniaxial nematic but also the biaxial nematic phase. We demonstrate that A131 experiences a surface anchoring transition from a perpendicular to tilted alignment when the temperature decreases. The features of the tilted state are consistent with surface-induced birefringence associated with smectic layering near the surface and a molecular tilt that changes along the normal to the substrates. The surface-induced birefringence is reduced to zero by a modest electric field that establishes a uniform uniaxial nematic state. Both refractive and absorptive optical properties of A131 are consistent with the uniaxial order. We found no evidence of the ``polycrystalline'' biaxial behavior in the cells placed in crossed electric and magnetic fields. We observe stable topological point defects (boojums and hedgehogs) and nonsingular ``escaped'' disclinations pertinent only to the uniaxial order. Finally, freely suspended films of A131 show uniaxial nematic and smectic textures; a decrease in the film thickness expands the temperature range of stability of smectic textures, supporting the idea of surface-induced smectic layering. Our conclusion is that A131 features only a uniaxial nematic phase and that the apparent biaxiality is caused by subtle surface effects rather than by the bulk biaxial phase." @default.
• W2012162483 created "2016-06-24" @default.
• W2012162483 creator A5004644751 @default.
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• W2012162483 date "2010-10-26" @default.
• W2012162483 modified "2023-10-16" @default.
• W2012162483 title "Surface alignment, anchoring transitions, optical properties, and topological defects in the nematic phase of thermotropic bent-core liquid crystal A131" @default.
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• W2012162483 doi "https://doi.org/10.1103/physreve.82.041711" @default.
• W2012162483 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21230299" @default.
• W2012162483 hasPublicationYear "2010" @default.
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