Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures

Nibu A. George, C. P G Vallabhan, V. P N Nampoori, A. K. George, P. Radhakrishnan

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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.

Original languageEnglish
Pages (from-to)3228-3232
Number of pages5
JournalJournal of Physics D: Applied Physics
Volume33
Issue number24
DOIs
Publication statusPublished - Dec 21 2000

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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