Abstract
A method for the determination of the force of adhesion of colloidal particles adhering to a planar surface in aqueous solutions has been used to study the influence of pH and ionic strength on the adhesion of polystyrene particles to a cellulose film as substrate. It is shown that the adhesion of these particles can be described quantitatively in terms of Van der Waals forces of attraction and electrostatic forces of repulsion. The adhesive force is maximum at the iso-electric point of the adherents where the adhesion is determined by Van der Waals forces only. The electrostatic double-layer interaction forces operating away from the iso-electric point are determined exclusively by the potential of the flat surface (cellophane).
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