講師：Prof. Bruce Law (Kansas State University)
題目：Particles at liquid surfaces: mechanics and thermodynamics
要旨：Particle adsorption and self-assembly, at a liquid surface, determines the surfactant behavior of these particles in Pickering emulsions and governs the flotation process, used extensively in the mining industry, to separate valuable minerals and metals in the ground from other residual materials. The physics of particles at liquid surfaces is still incompletely understood and is a subject of continuing current interest. In this seminar we review recent developments. The physics, which is applicable, depends upon particle size. For sufficiently large particles, of order microns, surface and line interactions determine the particle behavior as required by mechanical equilibrium. For sufficiently small particles, of order nanometers, both mechanical and thermodynamic equilibrium of the particle at the liquid surface must be considered. For these nanometer-sized particles finite-size line tension effects, originating from the van der Waals interaction, are found to play an important role.