Abstract
The interaction between alkanes with various chain length (solute) and liquid crystal substance, cholesteryl myristate (ChM : crystal→smectic→cholesteric→isotropic liquid), was studied by gas-liquid chromatography (GLPC), its stationary phase being composed of ChM and solid support, Chromosorb W. With variations in the gas flow-rate, ChM content in the stationary phase, and column temperature, the specific retention volume of each solute, Vg, was measured and its standard free energy, enthalpy, and entropy of solution in ChM, Δsoln G2⦵, Δsoln H2⦵, Δsoln S2⦵, were calculated. The gas flow-rate had a slight effect on Vg of the stationary phase with a large ChM content, although this effect could be nullified by the extrapolation of Vg to zero flow-rate. Logarithm of Vg or Δsoln G2⦵ depends almost linearly on the ChM content. From the analysis of Δsoln G2⦵ vs. temperature relationship, the effect of ChM content on Δsoln G2⦵ was found to be due to the contribution of Δsoln S2⦵, i.e., destruction of the liquid crystal structure by solute molecules.
