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Liquid Crystals and their Application
Russian Journal Zhidkie kristally i ikh prakticheskoe ispol'zovanie Жидкие кристаллы и их практическое использование |
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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2008, 1, 84—95. |
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Low-Frequency Ultrasonic Properties and Viscoelasticyti of Liquid Crystals at the Phase Transitions in Small-Volume Samples
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G. I. Maksimochkin1, S. V. Pasechnik1, N. V. Usol'tseva2, V. V. Bykova2, G. A. Timofeev2
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Author affiliations
1Moscow State University of Instrument-Making and Computer science
107996 Moscow, Stromynka Str., 20.
E-mail: maksgi2@mail.ru
2Ivanovo State University, Nanomaterials Research Institute
153025 Ivanovo, Ermak Str., 39.
E-mail: usol@ivanovo.ac.ru
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Abstract
The velocity of propagation and the coefficient of absorption of ultrasound in some liquid crystals (LCs): the esters of alkyloxyphenylcyclohexanecarboxylic acid, in the vicinity of the phase transitions has been studied in samples with the volume of 0.06 – 0.15 cm3 by using an acoustic resonance technique at frequencies in the range from 0.68 to 1.63 MHz. The analysis of the results of absolute and relative acoustic measurements provides information on the critical anomalies of the viscoelastic properties of LCs in the phase transition re-gions. The discussed acoustic method offers good prospects for the rapid investigation of the viscoelastic properties of small volumes of mesogenic compounds.
Keywords: -
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