NMR Study of the Local Molecular Dynamics in the Isotropic Phase of a Thermotropic Liquid Crystal

F. VACA CHAVEZ; F. BONETTO; D. J. PUSIOL

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY, SECTION A

Taylor and Francis

Lugar: Abingdom, United Kingdom.; Año: 2001 vol. 366 p. 37 - 42

1058-725X

Nuclear Magnetic Resonance proton spin-lattice measurements in phentylcyano-phenylcyclohexane liquid crystal at the Larmor frequencies 1.235 MHz and 48 kHz in a temperature range above the nematic-isotropic phase transition are reported. The Landau-De Gennes theory for nematic-isotropic phase transition is used to analyze the temperature dependence of the spin-lattice correlation functions. We conclude that the low frequency approximation can be applied only when the experiment is carried out at Larmor frequencies in the kHz. range.