対イオン濃度の異なる高濃度アルミナスラリー中での高分子分散剤による相互作用の原子間力顕微鏡を用いた解析

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The mechanism of anionic polymer dispersant acting on dense alumina suspension behavior was analyzed under different solid-volume fractions (ranging from 40 to 55 vol%) and counter-ion densities by comparing microscopic solid/liquid interface interaction to suspension viscosity. The solid/liquid interface interaction and adsorbed structure of polymer dispersant on particles were determined by an atomic force microscope (AFM). The dependency of counter-ion density on the suspension viscosity appeared at a relatively low solid-volume fraction (40 vol%). However, at a high solid-volume fraction (50 vol%), the suspension viscosity was independent of the counter-ion density. To analyze these phenomena, the force curves between a polished surface of alumina and the tip of AFM were measured in solution with polymer dispersant and different counter-ion densities. The increase of counter-ion density reduced the long-range overlapping repulsive force of an electrical double layer ranging over 10 nm in surface distance. A short-range steric repulsion force ranging below about 5 nm in surface distance slightly depended on counter-ion density. The estimated mean surface distance between particles in dense suspension decreased from about 8 to 4 nm with increasing the solid fraction from 40 to 50 vol%. Based on both results, it is concluded that the main mechanism for the aggregation/dispersion of alumina powder in dense suspension changed from electrostatic repulsive force to steric force with increasing the solid-volume fraction in suspension.
社団法人日本セラミックス協会の論文
2001-06-01

対イオン濃度の異なる高濃度アルミナスラリー中での高分子分散剤による相互作用の原子間力顕微鏡を用いた解析

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