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- W2039595390 abstract "The effect of changing pH and electrolyte concentration on the dispersion and zeta potential of Na-and Ca-forms of kaolinite, illite and smectite was investigated in relation to changes in their net negative charge. The percentage of dispersible Na-clay and the percentage increase in net negative charge was positively correlated with pH, but the slopes varied from clay to clay. In general, the net negative charge was the primary factor in clay dispersion, and the pH affected clay dispersion by changing the net charge on clay particles. Na-smectite had larger net charge at all pHs than Na-illite and Na-kaolinite, and it always had larger flocculation values. The role of electrolyte concentration could be due to its effect both on flocculation and variable charge component of the clay minerals. The zeta potential at different pHs also reflected the same trend of clay dispersion with net particle charge. In Ca-clays the trends were similar to Na-clays up to pH 7.0. In more alkaline solution CaCO3 formation led to charge reduction on clay particles, resulting in flocculation and reduction of zeta potential. At similar pHs the electrophoretic mobilities of all the clays showed constant potential behaviour. However, the zeta potentials of Ca-clays were always smaller than those of sodic clays because the clays were more aggregated. Net particle charge was the most important factor in controlling clay dispersion for the whole range of pH and ionic strength and for all types of cations." @default.
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- W2039595390 date "1995-12-01" @default.
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- W2039595390 title "Dispersion and zeta potential of pure clays as related to net particle charge under varying pH, electrolyte concentration and cation type" @default.
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- W2039595390 doi "https://doi.org/10.1111/j.1365-2389.1995.tb01362.x" @default.
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