Abstract
Abstract The volumetric behaviors of cholesteryl oleyl carbonate (COC) and cholesteryl oleate(CO) were investigated around the smectic(Sm)-cholesteric(Ch) and cholesteric-isotropic(I) transitions by using chromatographically purified materials. Both transitions showed marked pretransition phenomena in COC and CO. The transition volumes(ΔV) are; for COC ΔVSm-Ch=0.34 cm3 mol−1 at 22.8 °C and ΔVCh-I=0.66 cm3 mol−1 at 37.5 °C and for CO ΔVSm-Ch=0.88 cm3 mol−1 at 45.4 °C and ΔVCh-I=0.88 cm3 mol−1 at 50.7 °C. The Sm-Ch and Ch-I transitions are first order as predicted by mean-field theories. The pretransition volume around the Ch-I transition can be treated by the Landau-de Gennes theory for the first-order phase transition.
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