In the case of oil drop it is possible a molecularly thin film of oil to spread over (or among) the hydrocarbon tails of the adsorbed surfactant molecules: this is the transition Bв†’C in Fig. 14.9) corresponds to drop (particle) entry at the surface of the liquid film. The transition from state A to state B ( Fig. Stage L: Stretching of an oil bridge, which ruptures at its thinnest part and breaks the whole foam film. Stage K: dewetting of the formed вЂњbridgeвЂќ and rupture of the foam film. Stage H: particle entry at a second surface of the Plateau border.

Stage G: particle entry at one of the surfaces of the Plateau border. Stage F: anti-foam particle located in a Plateau border.

Stage E: bridging of the two film surfaces by an antifoam particle. Stage D: spreading of a thick oil film (for positive spreading coefficient, S > 0), which leads to destabilization and rupture of the foam film. Stage C: spreading of a molecularly-thin oil film from an oil droplet. Stage B: entry of a particle at the film surface. The antifoam particle is schematically depicted as a sphere, but it can acquire a lens-shape if it is an oil drop. Stages and transitions involved in the mechanisms of antifoaming action.

Dotp universal generator