Laser Induced Photoacoustic Technique for the Detection of Phase Transitions in Liquid Crystals

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Laser Induced Photoacoustic Technique for the Detection of Phase Transitions in Liquid Crystals

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dc.contributor.author Nibu A, George
dc.contributor.author Vallabhan, C P G
dc.contributor.author Nampoori, V P N
dc.contributor.author George, A K
dc.contributor.author Radhakrishnan, P
dc.date.accessioned 2011-11-08T09:13:36Z
dc.date.available 2011-11-08T09:13:36Z
dc.date.issued 2001
dc.identifier.other Nondestructive Testing and Evaluation Volume 17, Issue 6, 2001
dc.identifier.uri http://dyuthi.cusat.ac.in/purl/2496
dc.description.abstract In this paper we report the use of a laser induced phoroacoustic technique for the detection of multiple phase transitions in heptyl-oxy-cyanobiphenyl (70CB) and octyl-oxy-cyanobiphenyl (80CB) liquid crystals. The observed photoacoustic signal amplitude profile carries clear signatures of two tirst order transitions in 70CB and two tirst order and a second order transitions in 80CB. Analysis of the experimental data using Rosencwaig-Gersho theory shows that the sudden decrease in the photoacoustic (PA) signal amplitude during phase transitions is due to a sharp increase in the heat capacity of the samples near the transition temperatures. en_US
dc.description.sponsorship Cochin Universiry of Science and Technology & Sultan Qaboos Universiry. en_US
dc.language.iso en en_US
dc.publisher Taylor & Francis en_US
dc.subject Photoacoustic technique en_US
dc.subject Heptyl-oxy-cyanobiphenyl en_US
dc.subject Rosencwaig-Gersho en_US
dc.subject Nematic transition en_US
dc.title Laser Induced Photoacoustic Technique for the Detection of Phase Transitions in Liquid Crystals en_US
dc.type Working Paper en_US
dc.contributor.faculty Technology en_US
dc.identifier.url DOI: 10.1080/10589750108953117 en_US


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