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Abstract
The physical-chemical interactions between sodium polystyrene sulphonate (PSS), gelatin and a silver bromide sol are studied under different reaction conditions (pH, ionic strength, concentration of the reaction partners) by means of several experimental techniques: acidimctry, viscosimetry, micro-electrophoresis, calorimetry and measurement of the hydrodynamic adsorption layer thickness.
The gelatin—PSS interaction in solution is mainly ruled by electrostatic attraction between protonated cationic sites of the gelatin and the sulphonate groups of PSS. This interaction results in a hindrance or at least in a substantially reduction of the adsorption of gelatin on a negatively charged silver bromide surface. The mechanism is not based on a surface replacement of gelatin by PSS but on the reaction in solution of PSS with gelatin, competitive with the adsorption of gelatin.