Abstract
Abstract The translational diffusion of amphiphile molecules in lyotropic nematic phases has been studied for different orientations of the pulsed magnetic field gradient using the magic angle NMR spin-echo technique. Unrestricted diffusion was observed along the long axis of the cylindrical micelles and in the plane of the discotic micelles whereas in directions perpendicular to the above orientations diffusion was too small to be detectable. The observed magnitude of the diffusion coefficients as well as their anisotropy are characteristic for lamellar and hexagonal phases but the finite alignment times favour the view that the two mesophases are composed of finite micelles.
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