Creation of a nematic phase in mixtures of smectic A1 phases |
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Authors: | R Dbrowski B Wayska B Sosnowska |
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Institution: | 1. Military Technical Academy, 01-489 , Warsaw, Poland;2. Warsaw Technical University, 02-524 , Warsaw, Poland |
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Abstract: | Abstract Phase diagrams were determined for binary mixtures consisting of two 5-n-alkyl-2-(4'-isothiocyanatophenyl)-1,3-dioxane compounds (n-DBT) or 4'-isothio-cyanatophenyl 4-(trans-4'-n-decylcyclohexyl)benzoate and n-DBT. All compounds investigated have monolayer smectic A phases. A nematic phase in the upper temperature range and a nematic gap between two smectic regions also were observed, with the smectic layer spacing ratio, d/d', of 1.23 and 1.87 respectively. The variation of the enthalpy of transition with mixture composition in relation to changes of layer spacing ratio are also discussed for these systems. |
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