Abstract
Microemulsions are dispersions of oil and water made with surfactant molecules. Their microstructure is closely dependent on the spontaneous curvature of the surfactant film. In some cases, the curvature can be very small, and the microstructure is locally lamellar. De Gennes pointed out that the macrostructure is disordered because of thermal fluctuations of the surfactant film. He introduced the persistence length ξk of tne film, length over which the film remains locally flat, and related this length to the bending elastic modulus K of the film. He postulated that there should be a characteristic size of the oil and water microdomains, and that this size will be close to ξk. We will present measurements of the film elastic modulus K (obtained with ellipsometry) and of the characteristic size ξk (obtained with low-angle X-ray diffraction) done on several microemulsion systems confirming these ideas.
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© 1989 Plenum Press, New York
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Abillon, O., Binks, B.P., Langevin, D., Meunier, J., Ober, R. (1989). Persistence Length in Microemulsion Systems. In: Lee, LH. (eds) New Trends in Physics and Physucal Chemistry of Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0543-9_6
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DOI: https://doi.org/10.1007/978-1-4613-0543-9_6
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