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

Research output: Contribution to journalArticle

9 Citations (Scopus)

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

Fingerprint

Liquid Crystals
Photoacoustic effect
Liquid crystals
Phase transitions
liquid crystals
Electron transitions
light scattering
Nematic liquid crystals
specific heat
Light scattering
Specific heat
lasers
Lasers
temperature
Temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures. / George, Nibu A.; Vallabhan, C. P G; Nampoori, V. P N; George, A. K.; Radhakrishnan, P.

In: Journal of Physics D: Applied Physics, Vol. 33, No. 24, 21.12.2000, p. 3228-3232.

Research output: Contribution to journalArticle

George, Nibu A. ; Vallabhan, C. P G ; Nampoori, V. P N ; George, A. K. ; Radhakrishnan, P. / Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures. In: Journal of Physics D: Applied Physics. 2000 ; Vol. 33, No. 24. pp. 3228-3232.
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