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- W2073214272 abstract "Abstract We made measurements of the temperature dependence of the static dielectric constants, the optical anisotropy and the three elastic constants of binary mixtures belonging to twelve structurally and physically markedly different liquid crystal classes. The class-specific material properties were quantitatively correlated with molecular structural elements. The changes of material properties occurring when different LC-classes are combined were investigated. Analytical approximations are presented which are shown to reproduce the static transmission characteristics of twisted nematic cells and their dependence on material constants and temperature with an accuracy comparable to exact numerical calculations. Strong smectic pretransitional effects are shown to influence not only k 22 and k 33 but also k 11 , thus suggesting that not only twist and bend but also splay deformations may be prohibitive in smectics. We show that the elastic ratio &33/&11 of different liquid crystal classes increases with increasing dielectric anisotropy thus leading to a decrease of the slope of transmission characteristics of twist cells. Furthermore, it is shown that k 33 /k 11 decreases for molecules comprising heterocyclic rings whereas hydrogenation of an aromatic ring causes k 33 /k 11 to increase." @default.
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- W2073214272 date "1982-02-01" @default.
- W2073214272 modified "2023-10-16" @default.
- W2073214272 title "Class Specific Physical Properties of Liquid Crystals and Correlations with Molecular Structure and Static Electrooptical Performance in Twist Cells" @default.
- W2073214272 doi "https://doi.org/10.1515/zna-1982-0211" @default.
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