INVESTIGADORES
ACOSTA Rodolfo Hector
artículos
Título:
Pseudonematic order fluctuations of the director in the smectic phase of thermotropic liquid crystals
Autor/es:
R. H. ACOSTA; D. J. PUSIOL
Revista:
PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS
Referencias:
Año: 1999 vol. 60 p. 1808 - 1811
ISSN:
1063-651X
Resumen:
The NMR spin-lattice proton relaxation dispersion in the smectic mesophase of two liquid crystals, 4cyano-4-8-alkylbiphenyl and 4,4-bis-heptyloxyazoxybenzene, are studied over several decades of Larmor frequencies.The results show that the order fluctuation of the local smectic director contribution to T1( nL) undergoesa transition between two power regimes: from T1( nL)} n to nL1/2 on going from low to high Larmor frequencies.We explain this behavior by assuming, in the smectic mesophases, short coherence length nematiclikecooperative molecular reorientations. @S1063-651X~99!01508-1#
