Reference : Universal relaxation behavior of classical liquid crystals at hypersonic frequencies.
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/10993/13372
Universal relaxation behavior of classical liquid crystals at hypersonic frequencies.
English
Grammes, C. [> >]
Krüger, Jan-Kristian mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Bohn, K.-P. [> >]
Baller, Jörg mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Fischer, C. [> >]
Schorr, C. [> >]
Rogez, D. [> >]
Alnot, Patrick [> >]
1995
Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
American Physical Society
51
430-440
Yes
1063-651X
College Park
MD
[en] Within this work we present comparative Brillouin and ultrasonic investigations of p-methoxybenzylidene p-(n-butylaniline), p-azoxyanisol, and 4-cyano-4’-pentyl-biphenyl performed in the vicinity of the nematic-isotropic transition. We confirm the existence of a universal hypersonic relaxation mechanism of weak activation energy and a related significant splitting of the two principal longitudinal acoustic modes within the nematic phase. Brillouin refractometry is proposed as a method to determine the magnitude of the nematic order parameter simultaneously with the second-order elastic stiffness constants. The origin of the hypersonic anisotropy is discussed in terms of thermal relaxations and the evolution of the nematic order parameter.
http://hdl.handle.net/10993/13372
10.1103/PhysRevE.51.430

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