Re-entrant and induced mesophases: Mixed systems showing re-entrant TGBA and re-entrant cholesteric phases |
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Authors: | Volkmar Vill Hanns-Walter Tunger Daniel Peters |
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Institution: |
a Institute of Organic Chemistry, University of Hamburg, Hamburg, Germany |
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Abstract: | We have investigated the behaviour of chiral carbohydrate-based trioxadecalines with a cyano group in mixed systems. The mixture of a trioxadecaline having a Ch phase and a trioxadecaline having a Ch, SA and a S*Cphase sequence induces a re-entrant TGBA and Ch phase. Below the stabilized S*C phase, a re-entrant Ch phase is observed. In the mixture of the cholesteric trioxadecaline with CCH7, itself only showing a nematic phase, a TGBA phase and a broad range SA phase are induced from two non-smectic compounds. Both mixtures show a blue phase with a pitch ranging from the UV to red depending on the molar fraction. |
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