Studying viscoelastic properties of liquid crystals during nematic-isotropic phase transition by low-frequency ultrasound probing of small-volume samples

Autor:	N. V. Usol’tseva, A. S. Kravchuk, G. A. Timofeev, G. I. Maksimochkin, S. V. Pasechnik, V. V. Bykova
Rok vydání:	2007
Předmět:	Phase transition Materials science Nuclear magnetic resonance Physics and Astronomy (miscellaneous) Condensed matter physics Liquid crystal Phase (matter) Isotropy Velocity factor Absorption (chemistry) Viscoelasticity Acoustic resonance
Zdroj:	Technical Physics Letters. 33:505-507
ISSN:	1090-6533 1063-7850
DOI:	10.1134/s1063785007060181
Popis:	The velocity of propagation and the coefficient of absorption of ultrasound in liquid crystals (LCs) in the vicinity of the phase transition from a nematic phase (N) to the isotropic liquid (I) has been studied in samples with a volume of 0.15 cm3 using an acoustic resonance technique at frequencies in the range from 0.68 to 1.63 MHz. An analysis of the results of acoustic measurements provides information on the characteristics of phase transition and critical anomalies in the viscous properties of LCs in the N-I phase transition region. The proposed acoustic method offers good prospects for the rapid investigation of small volumes of mesogenic compounds.
Databáze:	OpenAIRE
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