66 research outputs found
Influence of chemical structure on the mesomorphic behaviour of 3,5-disubstituted 1,2,4-oxadiazoles
No full textThe correlation between chemical structure and mesomorphic properties is one of the most important problems in liquid crystals science. 3,5-Disubstituted 1,2,4-oxadiazoles are very convenient model-compounds for studying the dependence of the LC properties on the molecular design. The transition temperatures and dielectric properties of 1,2,4-oxadiazoles depend significantly both on the position of the substituents with respect to the heterocycle and on their donor or acceptor features
Spontaneous chiral domains in the nematic phase of the achiral trans-4-alkylcyclohexanecarboxylic acids
No full textIn-plane Bidimensional Stripes in Thin Films of CCH-PCH Mixtures: Possible Nucleation of a Tilted Smectic Phase
No full textA novel order transition inside the nematic phase of trans -4-hexylcyclohexane-1-carboxylic acid discovered by image processing
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Alignment transition driven by adsorption in a nematic liquid crystal forming H-bonds
No full textRestricted Access.We have found that some nematic liquid crystals whose molecules from H-bonds, namely trans-4-alkylcyclohexanecarboxylic acids, undergo a new type of alignment transition on silicon-monoxide-coated glass plates exposed to dry air. We argue that it is caused by the adsorption of the acid monomers and discuss the result on the basis of Fowler's theory
Textures of homologous 4-n-alkyloxybenzoic acids: spontaneous chirality and surface memory
No full textDimerization in trans-4-butylcyclohexanecarboxylic acid and in its mixture with 12% cis-isomer observed via H- and D- NMR
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