Use of an open photoacoustic cell for the thermal characterisation of liquid crystals
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 th...
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| Veröffentlicht in: | Applied physics. B, Lasers and optics Lasers and optics, 2001-08, Vol.73 (2), p.145-149 |
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| container_title | Applied physics. B, Lasers and optics |
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| creator | GEORGE, N. A VALLABHAN, C. P. G NAMPOORI, V. P. N GEORGE, A. K RADHAKRISHNAN, P |
| description | 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. |
| doi_str_mv | 10.1007/s003400100622 |
| format | Article |
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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.</abstract><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/s003400100622</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Applied physics. B, Lasers and optics, 2001-08, Vol.73 (2), p.145-149 |
| issn | 0946-2171 1432-0649 |
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| subjects | Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology Feasibility Glycerols Heat capacities of liquids Lasers Liquid crystals Materials science Materials testing Mesophase Nondestructive testing: ultrasonic testing, photoacoustic testing Phases Photoacoustic cells Physics Thermal effusivity Thermal properties of condensed matter Thermal properties of liquids: heat capacity, thermal expansion |
| title | Use of an open photoacoustic cell for the thermal characterisation of liquid crystals |
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