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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v30.i3.40
8 pages

Sound Propagation in Liquid Crystal 5CB and 5CB Based Aerosil Suspensions

A. V. Glushchenko
Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
V. S. Sperkach
Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
O. V. Yaroshchuk
Taras Shevchenko National University, Kyiv, Ukraine

Краткое описание

The sound speed and absorption in nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB) and its mixtures with aerosil within the temperatures of nematic and isotropic phases of 5CB are investigated. In both pure 5CB and its mixtures with aerosil the two relaxation regions with frequencies fr1 ≈ 10 MHz and fr2 ≈ 400 MHz are revealed. The relaxation frequency fr1 critically increases in the nematic - isotropic phase transition and decreases with the increase of the aerosil concentration. Simultaneously, the frequency fr2 does not demonstrate critical behavior in the transition region and practically does not change with the insertion of an aerosil dopant. It is believed, that the first relaxation region is connected with the peculiarities of mesomorphic state, whereas the second one is typical for all liquids. A linear increase of the absorption coefficient and monotonous decrease of the sound velocity at the increasing of aerosil concentration reflect the constitution of aerosil in form of separated aggregates and lack of three-dimensional aerosil network.


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