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

Dyuthi/Manakin Repository

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

Show full item record

Title: Use of an open photoacoustic cell for the thermal characterisation of liquid crystals
Author: Radhakrishnan, P; Nampoori, V P N; Girijavallabhan, C P; Nibu, A George; George, A K
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/1835
Date: 2001-07-18


Files in this item

Files Size Format View
Use of an open ... al characterisation of.pdf 139.1Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record

Search Dyuthi


Advanced Search

Browse

My Account