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Molecular Origin of Model Membrane Bending Rigidity

by: Erol Kurtisovski, Nicolas Taulier, Raymond Ober, Marcel Waks, Wladimir Urbach
Physical Review Letters, Vol. 98, No. 25. (Jun 2007), 258103, doi:10.1103/physrevlett.98.258103  Key: citeulike:2096718

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Abstract

The behavior of the bending modulus κ of bilayers in lamellar phases was studied by Small Angle X-ray Scattering technique for various nonionic CiEj surfactants. The bilayers are either unswollen and dispersed in water or swollen by water and dispersed in dodecane. For unswollen bilayers, the values of κ decrease with both an increase in the area per surfactant molecule and in the polar head length. They increase when the aliphatic chain length increases at constant area per surfactant molecule. Whereas for water-swollen membranes, the values of κ decrease as the content of water increases converging to the value of the single monolayer bending modulus. Such a behavior results from the decoupling of the fluctuations of the two surfactant membrane monolayers. Our results emphasize the determinant contribution of the surfactant conformation to κ


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