ABSTRACT
Quasi-binary (QB) picture of thermotropics, which regards a neat thermotropic liquid crystal as a binary system consisting of (semi)rigid core and molten alkyl chain, was assessed experimentally for the most famous (and representative) thermotropic mesogenic series nCB. By adding n-heptane as solvent, the smectic A phase was induced in 7CB–n-heptane system. Small angle x-ray diffraction showed that the QB picture holds not only in the phase behavior but also in the structure. It is suggested that the melting of 8CB and 9CB to isotropic liquid via smectic and nematic liquid crystals can be understood as a thermotropic–lyotropic crossover.
ACKNOWLEDGMENTS
The authors are indebted to Mr. K. Horiuchi for his valuable discussion. This work was supported in part by Grant-in-Aid for Scientific Research (B) 22350056 from Japan Society for the Promotion of Science (JSPS).
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