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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/1837

Title: Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures
Authors: Girijavallabhan, C P
Radhakrishnan, P
V P N Nampoori
Nibu, A George
George, A K
Keywords: photoacoustic
phase transitions
liquid crystal mixtures
Issue Date: 13-Oct-2000
Publisher: Journal of Physics D : Applied Physics
Citation: International School of Photonics, Cochin University of Science and Technology
Abstract: We report on a laser induced photoacoustic study of the nematic-to-isotropic transition in certain commercial nematic liquid crystal mixtures, namely BL001, BL002, BL032 and BL035. A simple analysis of the experimental data using the Rosencwaig–Gersho theory shows that the heat capacities of all these compounds exhibit a sharp peak as the temperature of the sample is varied across the transition region. Also, substantial differences in the photoacoustic signal amplitudes in nematic and isotropic phases have been noticed for all the mixtures. The increased light scattering property of the nematic phase may be the reason for the enhanced photoacoustic signal amplitude in this phase.
URI: http://dyuthi.cusat.ac.in/purl/1837
Appears in Collections:Dr.C P Girijavallabhan

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