Methyl cellulose bridging between alumina surfaces

概要

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Forces between α-alumina surfaces in NH4+ salt of poly(acrylic acid) (NH4-PAA) and methyl cellulose polymer solutions at pH 9 were measured by colloid probe technique. The effect of water soluble methyl cellulose, with and without the presence of surfactant (NH4-PAA), on the surface forces was probed to understand the binding action of methyl cellulose between particles. Two types of cantilevers were used to probe the surface forces in the presence of adsorbed polymers at various concentrations. Strong polymer concentration dependence of surface forces was found. At high polymer concentrations due to the high coverage of surfaces, repulsive forces dominated the interaction. Methyl cellulose bridges have been measured up to ∼300 nm. The pre-treatment of surfaces with NH4-PAA resulted in much lower number of bridging events on retraction.