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- W1997728719 abstract "Interactions between nonionic polyacrylamide and Na kaolinite in aqueous suspensions are discussed in terms of amide-hydroxyl H bonding. Correlations obtained by comparing the extent of adsorption of the polymer onto the clay mineral and onto synthetic aluminosilicates at different pH reveal the dominant effect of the surface density of “free” hydroxyl groups acting as adsorbing sites on both adsorbent types. Most interesting is the opposing behavior of the basal and edge faces of the kaolinite with regard to the polymer/surface affinity. Indeed, two crystallographically different surfaces are exposed by the plate-like particles: in relation to a polymer present in aqueous suspension, the basal faces act as repulsive surfaces and the edge faces act as adsorbing ones. The pH controls the extent of polymer adsorption. Variation of this parameter influences the sign and magnitude of the electrical charge of the edges and thus leads to changes in the surface density of “free” hydroxyls, present either as silanol in the acidic range or as aluminol in the alkaline range. Results concerning the variation of the surface coverage with polymer concentration are discussed in terms of the nature of the interactions between the un-ionized polyacrylamide and Na kaolinite." @default.
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- W1997728719 date "1985-07-01" @default.
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- W1997728719 title "Adsorption of polyacrylamide to Na kaolinite: Correlation between clay structure and surface properties" @default.
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- W1997728719 doi "https://doi.org/10.1016/0021-9797(85)90384-4" @default.
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