Universal relaxation behavior of classical liquid crystals at hypersonic frequencies.

Grammes, C.; Krüger, Jan-Kristian; Bohn, K.-P.; Baller, Jörg; Fischer, C.; Schorr, C.; Rogez, D.; Alnot, Patrick

doi:10.1103/PhysRevE.51.430

Reference : Universal relaxation behavior of classical liquid crystals at hypersonic frequencies.


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/10993/13372

Title :	Universal relaxation behavior of classical liquid crystals at hypersonic frequencies.
Language :	English
Author, co-author :	Grammes, C. [> >]
	Krüger, Jan-Kristian [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Bohn, K.-P. [> >]
	Baller, Jörg [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Fischer, C. [> >]
	Schorr, C. [> >]
	Rogez, D. [> >]
	Alnot, Patrick [> >]
Publication date :	1995
Journal title :	Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Publisher :	American Physical Society
Volume :	51
Pages :	430-440
Peer reviewed :	Yes
ISSN :	1063-651X
City :	College Park
Country :	MD
Abstract :	[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.
Permalink :	http://hdl.handle.net/10993/13372
DOI :	10.1103/PhysRevE.51.430

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