Phase transition between nematic and isotropic liquid PCB crystal registered by an acoustic field

Dariusz Wilk; Marian Cieslak; Adam Drzymala

doi:10.1117/12.385689

12 May 2000 Phase transition between nematic and isotropic liquid PCB crystal registered by an acoustic field

Dariusz Wilk, Marian Cieslak, Adam Drzymala

Proceedings Volume 4147, Liquid Crystals: Chemistry, Physics, and Applications; (2000) https://doi.org/10.1117/12.385689
Event: XIII International Conference on Liquid Crystals: Chemistry, Physics, and Applications, 1999, Krynica Zdroj, Poland

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.

Citation Download Citation

Dariusz Wilk, Marian Cieslak, and Adam Drzymala "Phase transition between nematic and isotropic liquid PCB crystal registered by an acoustic field", Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); https://doi.org/10.1117/12.385689

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