Articles you may be interested inSolvent effect on phase transition of lyotropic rigid-chain liquid crystal polymer studied by dissipative particle dynamics J. Chem. Phys. 138, 024910 (2013); 10.1063/1.4774372Phase behavior of lyotropic rigid-chain polymer liquid crystal studied by dissipative particle dynamics Nuclear spin relaxation in a hexagonal lyotropic liquid crystal J. Chem. Phys. 95, 6945 (1991); 10.1063/1.461506Theory of dipolar relaxation in lamellar system: Application to lyotropic liquid crystalsIn the phases of lyotropic liquid crystals. such as soap-water systems. a large scale periodic organization of aqueous and paraffinic media coexists with a short range disorder of both media. We present here a nuclear magnetic resonance study of the paraffinic protons in the mesophases of the potassium laurate-D,O system. Special aspects of the NMR properties of the proton spin system in such phases are discussed. Taking benefit of the geometrical fcatures of the lamellar. cubic. and hexagonal phases we can distinguish several motions: rapid diffusion of the molecules with their polar heads remaining on the soap-water interface: configurational changes which can be due to flexion. torsion. or isomeric rotations. Owing to the existence of the interface and to the presence of neighboring molecules the local deformation motions arc highly anisotropic. The diffusion coefficient. measured in the cubic phase. with the field gradient method. has a value of 2X 10-6 cm'sec l at 90T its activation energy is 0.25 eV. The characteristic times of the chain deformations studied by relaxation measurements (T, ,T t p,TD), are distributed from 3 X 10'6 sec to about IO-"sec at 90'C. Possible correlations between diffusion and deformations are discussed.
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