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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/1836

Title: Use of an open photoacoustic cell for the thermal characterisation of liquid crystals
Authors: V P N Nampoori
Radhakrishnan, P
Girijavallabhan, C P
Nibu, A George
George, A K
Keywords: open photoacoustic
thermal characterisation
liquid crystals
Issue Date: 18-Jun-2001
Publisher: Applied Physics B Lasers and Optics
Citation: International School of Photonics, Cochin University of Science and Technology
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
URI: http://dyuthi.cusat.ac.in/purl/1836
Appears in Collections:Dr. V P N Nampoori

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