Abstract
The surface charge was determined for various cellulose fibres: bleached softwood sulphate pulp, bleached hardwood sulphate pulp, bleached eucalyptus grandis sulphate pulp, never-dried unbleached softwood sulphite pulp and bleached softwood sulphite pulp. The surface charge was determined as a function of pH at 25°C over the electrolyte concentration range 1·10 −3 to 4·10 −1 mol dm −3 NaCl. The surface areas of the first four pulps obtained by the method of negative adsorption are reported. The bleached softwood sulphate pulp was oxidised to increase the surface charge and the surface areas for the oxidised and non-oxidised fibres agreed within experimental error. The negative adsorption results for the bleached hardwood sulphate pulp clearly showed the effect of overlapping double layers.
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