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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Complex Fluids, Colloids, Micelles and Vesicles (joint session CPP/DY)

CPP 44.3: Talk

Thursday, March 21, 2024, 15:45–16:00, H 0110

Mesoporous silica colloids: surfactant cleaning, wetting and surface diffusion — •Antonio Stocco — Institut Charles Sadron, University of Strasbourg, CNRS, France

We have investigated the use of mesoporous silica colloids to remove cationic surfactants from water. Porous silica colloids diffuse at the surface of water and in the volume, interacting with cationic surfactants that can adsorb inside the pores of these particles. We observed that surfactant adsorption on mesoporous silica depends dramatically not only on the particle pore size but also on specific counterion effects. We measured striking differences both on a macroscopic property of the interface, i.e. surface tension, and also at a single particle level by evaluating the translational diffusion of partially wetted particles at the fluid interface.

Keywords: porous colloids; wetting; surfactants; Brownian motion; decontamination