Résumé:

What happens at the interface of particle dispersions ? Do particles lie at the wetting angle and fully pack at the water surface ? In the first part of this talk, I will introduce some issues on the attachment of (nano)particles at the water interface. Interfacial energy landscapes will be discussed after presenting in-situ contact angle measurements of 100 nm particles at the air-water. Interfaces populated by silica (nano)particles and particle-stabilised foams will be described in second part of the talk. Here, indirect and in-situ experiments on planar interfaces , free standing films , bubbles and foams will help understanding the stabilization mechanisms in particle-stabilised aqueous foams.