J. Phys. IV France 125 (2005) 213-216
Determination of phase transition temperatures in thermotropic liquid crystals by modulated optical transmission and thermal lens spectroscopyR. 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