SANS structural determination of a nonionic surfactant layer adsorbed on clay particles

We study adsorption ofʹ two nonionic surfactants (C12E5 and C12E8) on a dispersed suspension of anegatively charged laponite particles. First, we quantify adsorption, i.e. the a.Miuunt. of adsorbed molecules per gram of dried solid. Then. we show tha.t contrast variation experiments under controlled conditions along the adsorption isotherm of the surfactant on dispersed laponite particles allow to determine the average thickness of a nonionic surfactant layer adsorbed on a solid anisotropic particle.