Dynamic light scattering measurements on oriented samples of lyotropic smectics have been performed. The layer compressibility modulus B is extracted from the anisotropic dispersion relation of the so-called slip mode, which arises from the coupling between concentration and layer displacement fluctuations. The samples are diluted with three different solvents (repeat distances 50 to 800 {}): The behavior of B suggests either undulation or electrostatic repulsions between membranes, depending on the swelling solvent.
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Nallet et al. (1989) studied this question.
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