Abstract
The surfactant film bending elasticity can be described by a spontaneous curvature C0 and two elastic constants K and \(\bar K\), associated with the mean curvature and the Gaussian curvature, respectively. These parameters are very important in the determination of the structure of the dispersions stabilized by the surfactant (droplets or sponge-like structures). This is discussed in relation to former experiments. Recent neutron scattering determinations of the microemulsion droplet polydispersity are presented. It is shown that, in combination with results from ellipsometric experiments, these data can allow the estimation of \(\bar K\).Key wordsMicroemulsionbending energyGaussian curvature elasticityneutron scatteringdroplet polydispersity
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