Eur. Phys. J. B 10, 29-34 (1999)
https://doi.org/10.1007/s100510050826

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

¹ CEA Saclay, Service de Chimie Moléculaire, bâtiment 125, 91191 Gif-sur-Yvette, France
² CRMD, CNRS, 1bis rue de la Ferollerie, 45071 Orléans, France

Corresponding author: ^a grillo@ill.fr

Received: 4 August 1998
Published online: 15 July 1999

Abstract

We study adsorption of two nonionic surfactants (C₁₂E₅ and C₁₂E₈) on a dispersed suspension of negatively charged laponite particles. First, we quantify adsorption, i.e. the amount of adsorbed molecules per gram of dried solid. Then, we show that 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.