Reference : Second-order elasticity of liquid crystals within their nematic state at high frequencies
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/10993/13371
Second-order elasticity of liquid crystals within their nematic state at high frequencies
English
Krüger, Jan-Kristian mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Grammes, C. [> >]
Jiménez, R. [> >]
Schreiber, J. [> >]
Bohn, K.-P. [> >]
Baller, Jörg mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Fischer, C. [> >]
Rogez, D. [> >]
Schorr, C. [> >]
Alnot, Patrick [> >]
1995
Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
American Physical Society
51
3
2115-2128
Yes
1063-651X
College Park
MD
[en] Within this work we present Brillouin and ultrasonic investigations performed on the liquid crystals p-methoxybenzylidene p-(n-butylaniline) (MBBA), p-azoxyanisol (PAA), 4-cyano-4-n-alkylbiphenyles (nCB), and 4-n-pentoxybenzylidene-4'-n-octoaniline (5O.8). Special attention has been paid to the evolution of a significant splitting of the two longitudinal polarized acoustic modes within the nematic phase. Angle-resolving Brillouin spectroscopy allowed the determination of the complete stiffness tensors and hence a discussion of the propagation of quasitransverse polarized acoustic modes in the nematic state of liquid crystals. We analyze the behavior of the eigenvectors of the relevant acoustic modes and discuss their significance for the propagation of quasishear modes. For 5O.8 we report an acoustic instability within its nematic state. We confirm the existence of a universal thermal relaxation mechanism of weak activation energy for the nematic state of classical liquid crystals. The observed hypersonic anisotropy is discussed in terms of that relaxation mechanism and is compared with that of glass-forming liquid crystals.
http://hdl.handle.net/10993/13371
10.1103/PhysRevE.51.2115
http://www.scopus.com/scopus/record/display.url?fedsrfIntegrator=METALIB-SCOCIT& origin=fedsrf& view=basic& eid=2-s2.0-4243895010

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