LASER INDUCED PHOTOACOUSTIC TECHNIQUE FOR THE DETECTION OF PHASE TRANSITIONS IN LIQUID CRYSTALS
Source abstract
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.
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Research context
OpenAlex topics: Thermography and Photoacoustic Techniques · Photoacoustic and Ultrasonic Imaging · Calibration and Measurement Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
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