Abstract
Dynamic light scattering measurements on oriented samples of lyotropic smectics have been performed. The layer compressibility modulus 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 Å): The behavior of suggests either undulation or electrostatic repulsions between membranes, depending on the swelling solvent.
- Received 22 August 1988
DOI:https://doi.org/10.1103/PhysRevLett.62.276
©1989 American Physical Society