The Influence of Hydration on the Stability of Hydrophobic Colloidal Systems
The surface of a solid becomes electrically charged when placed in contact with an aqueous medium; the potential thus acquired at the interface is responsible for the preferential attraction of ions of opposite charge toward the surface and the establishment of an “electrical double layer” at the solid/liquid interface. Close approach of two such charged surfaces, together with their associated double layers, will result in the generation of a repulsive force between the surfaces. Colloidal systems are characterized primarily by the extremely large interface which exists between the particulate or disperse phase and the bulk liquid or dispersion medium; the repulsive force between the surfaces is therefore of primary importance for the resistance to flocculation, which would otherwise occur spontaneously under the influence of longer range van der Waals attractive forces.
KeywordsDouble Layer Alcohol Molecule Diffuse Double Layer Hydration Structure DLVO Theory
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