Abstract
The rheological behavior of emulsions and suspensions is considered in relation to the properties of surface films adsorbed on the dispersed particles. With change of composition in mixed liquids or with small additions of high molecular weight substances, important variations in thixotropy, etc., of a dispersion are recorded which are due to changes in the character of the interfacial surface film. Friction increases between the particles, for example, result in larger sedimentation volumes and higher specific viscosity. This aspect of the theory of emulsions and suspensions, especially for the more concentrated systems, outweighs the usual approach of purely hydrodynamic considerations. It is concluded that future progress in this field depends on results of studies on the properties of thin films of liquid adsorbed on surfaces, including friction measurements at low pressures.
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