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Proceedings Paper

Phase transition between nematic and isotropic liquid PCB crystal registered by an acoustic field
Author(s): Dariusz Wilk; Marian Cieslak; Adam Drzymala
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Paper Abstract

Results of the investigations on PCB liquid crystal as a representative of the nematic simple phase are described in here. Sound speed and sound attenuation the phase transitions (nematic mesophase-isotropic liquid) are measured. Methods of molecular acoustics are used in this research project. Measurement of the sound speed and sound attenuation were performed at 2.5 MHz frequency with an application of the external magnetic field directed perpendicular to the ultrasonic wave propagation or without an acoustic field. These measurements were realized for the phase transitions like mesophase-nematic isotropic liquid and also liquid-isotropic mesophase nematic. Experimental data were analyzed by an application of Fisher method, which allows to find the critical parameters. For same numeric reason we combined two Fisher curves (interpolating curve of the experimental points in nematic mesophase with an interpolating curve for isotropic liquid in mesophase) to obtain a resulting curve. This connection allowed to determine the parameters of a resulting curve and especially the critical exponents and a temperature of phase transition.

Paper Details

Date Published: 12 May 2000
PDF: 6 pages
Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); doi: 10.1117/12.385689
Show Author Affiliations
Dariusz Wilk, Rzeszow Univ. of Technology (Poland)
Marian Cieslak, Rzeszow Univ. of Technology (Poland)
Adam Drzymala, Rzeszow Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 4147:
Liquid Crystals: Chemistry, Physics, and Applications
Stanislaw J. Klosowicz; Jolanta Rutkowska; Jerzy Zielinski; Jozef Zmija, Editor(s)

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