Abstract
Total internal reflection microscopy has been used to study the interactions between a single colloidal particle and a solid surface in an aqueous environment. The effects upon the interaction of various concentrations of 1:1 electrolyte were in good accord with expectation, except at distances less than 100–150 nm, where an additional attractive interaction of presently unknown origin appeared. In the presence of an electric field normal to the surface, the interactions were modified in a manner which accorded well with electro-kinetic theory, allowance being made for the hindered diffusion near a wall. Addition of adsorbing polymer (polyethylene oxide) above a threshold concentration inhibited irreversible bonding of the particle to the wall. The observed interaction of an oil-in-water emulsion droplet with the solid surface showed no effects of drop deformation. These results are discussed in the light of recent studies.
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