| 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 |