EVIDENCE FOR NEWTON BLACK FILMS BETWEEN ADHESIVE EMULSION DROPLETS

A soap film (made of two air/water interfaces covered by surfactant) m ay turn into a so-called Newton black film (NBF) which essentially con sists in a surfactant bilayer. Oil-in-water emulsion droplets covered with surfactant: (oil/water interfaces) may become adhesive in similar conditions. We show by analyzing the neutron scattering pattern from a collection of submicronic oil-in-water adhesive droplets that the th in film that forms between them is structurally identical to the NBF. As a consequence, he formation of NBF is a general property of ionic s urfactants.