Spin-lattice dispersion in nematic and smectic-A mesophases in the presence of ultrasonic waves: A theroretical approach.

F. BONETTO; E. ANOARDO

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

American Physical Society (APS)

Lugar: Ridge, New York, USA; Año: 2003 vol. 68 p. 217031 - 2170310

1063-651X

We present a theoretical study about the Larmor frequency dependence of the nuclear spin-lattice relaxation caused by order director fluctuations for both nematic and semctic A mesophases. The analysis is focused on the case where the molecular system is subjected to sonication during the relaxation process. The departure from the non-sonicated case is discussed for various values of the involved parameters. Two different approaches are discussed for the smectic case.