Abstract
Abstract Molecular dynamics studies were carried out in the S A and S * C mesophases of the Ferroelectric Liquid Crystal Val.DOC by means of longitudinal proton spin relaxation dispersion. Fast field-cycling and conventional Nuclear Magnetic Resonance (NMR) techniques were used to obtain the frequency dependence of T 1 covering frequencies from 102 to 3 × 108 Hz at two different temperatures in each mesophase. The T 1 dispersion in both mesophases could be well modeled by the proposed dominant relaxation mechanisms, namely collective motions, molecular self diffusion and local molecular rotations. A Soft mode contribution to the spin-lattice relaxation could not be singled out from the contribution of other collective motions. The diffusion constant D ⊥perpendicular to the director was obtained at all temperatures studied and involves an activation energy of about 35 kJ/mol. Effective correlation times characterizing the average molecular rotations around the long axis and fluctuations of this axis, respe...
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