J. Phys. IV France
Volume 125, June 2005
Page(s) 213 - 216

J. Phys. IV France 125 (2005) 213-216

DOI: 10.1051/jp4:2005125050

Determination of phase transition temperatures in thermotropic liquid crystals by modulated optical transmission and thermal lens spectroscopy

R. Mayén-Mondragón and J.M. Yánez-Limón

Centro de Investigación y de Estudios Avanzados del I.P.N., Unidad Querétaro, Libramiento Norponiente No. 2000, Fracc. Real de Juriquilla, CP 76230 Querétaro, Qro. Mexico

The main phase-transition-temperatures of cholesteryl nonanoate, cholesteryl oleyl carbonate and their mixtures were determined by Differential Scanning Calorimetry; phase identification was performed by Polarizing Light Microscopy. The results were compared to the ones obtained by Modulated Optical Transmission and Thermal Lens Spectroscopy; this last technique also allowed the determination of the sample thermal diffusivity as a function of temperature.

© EDP Sciences 2005