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

Nibu A. George | Zendy; C. P. G. Vallabhan | Zendy; V. P. N. Nampoori | Zendy; A. K. George | Zendy; P. Radhakrishnan | Zendy

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

Author(s) -

Nibu A. George,

C. P. G. Vallabhan,

V. P. N. Nampoori,

A. K. George,

P. Radhakrishnan

Publication year - 2001

Publication title -

applied physics b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.591

H-Index - 131

eISSN - 1432-0649

pISSN - 0946-2171

DOI - 10.1007/s003400100622

Subject(s) - thermal effusivity , liquid crystal , materials science , thermal , photoacoustic imaging in biomedicine , isotropy , photoacoustic effect , optics , thermodynamics , thermal resistance , physics , optoelectronics , thermal contact conductance

. 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.

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