Use of an open photoacoustic cell for the thermal characterisation of liquid crystals

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In this paper, we describe the use of an open cell photoacoustic configuration for the evaluation of the thermal effusivity of liquid crystals. The feasibility, precision and reliability of the method are initially established by measuring the thermal effusivities of water and glycerol, for which the effusivity values are known accurately. In order to demonstrate the use of the present method in the thermal characterization of liquid crystals, we have measured the thermal effusivity values in various mesophases of 4-cyano-4'- octyloxybiphenyl (8OCB) and 4-cyano-4'-heptyloxybiphenyl (7OCB) liquid crystals using a variable temperature open photoacoustic cell. A comparison of the measured values for the two liquid crystals shows that the thermal effusivities of 7OCB in the nematic and isotropic phases are slightly less than those of 8OCB in the corresponding phases.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalApplied Physics B: Lasers and Optics
Volume73
Issue number2
Publication statusPublished - 2001

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liquid crystals
cells
glycerols
evaluation
configurations
water
temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

George, N. A., Vallabhan, C. P. G., Nampoori, V. P. N., George, A. K., & Radhakrishnan, P. (2001). Use of an open photoacoustic cell for the thermal characterisation of liquid crystals. Applied Physics B: Lasers and Optics, 73(2), 145-149.

Use of an open photoacoustic cell for the thermal characterisation of liquid crystals. / George, N. A.; Vallabhan, C. P G; Nampoori, V. P N; George, A. K.; Radhakrishnan, P.

In: Applied Physics B: Lasers and Optics, Vol. 73, No. 2, 2001, p. 145-149.

Research output: Contribution to journalArticle

George, NA, Vallabhan, CPG, Nampoori, VPN, George, AK & Radhakrishnan, P 2001, 'Use of an open photoacoustic cell for the thermal characterisation of liquid crystals', Applied Physics B: Lasers and Optics, vol. 73, no. 2, pp. 145-149.
George, N. A. ; Vallabhan, C. P G ; Nampoori, V. P N ; George, A. K. ; Radhakrishnan, P. / Use of an open photoacoustic cell for the thermal characterisation of liquid crystals. In: Applied Physics B: Lasers and Optics. 2001 ; Vol. 73, No. 2. pp. 145-149.
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