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It is well known that amphiphilic materials can af fect dispersion stability of colloidal systems. They work as a sensitizer (coagulant) to destabilize dispersion state of colloids in some situation, and as a protecting agent to stabilize colloids in other situations. There are a large variety of amphiphilic materials such as small-molecular sur factant and amphiphilic biopolymers, proteins or polysaccharides, and one have to give careful consideration to the ef fects of each amphiphile case by case. In this review ar ticle, the author focused attention to 1) the influence of small-molecular ionic surfactants to the colloidal stability of suspensions (especially, negatively charged polystyrene latex) and 2) the formation of O/W emulsions using three kinds of proteins having emulsifying ability (bovine serum albumin, β-lactoglobulin, and β-casein) and their stability. Experimental data concerning adsorption behaviors of these surfactant or protein molecules are presented, and the relation between the adsorbed amount of these molecules and dispersion stability of colloidal particles was briefly explained.

Effects of Addition of Amphiphilic Molecules on the Dispersion Stability of Colloidal Systems