Mg^<2+>イオンを含む溶液中でのα-アルミナの溶出に及ぼすポリアクリル酸アンモニウムの添加効果

概要

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Dissolution behavior of high purity α-alumina particles and adsorption of Mg^<2+> ions onto α-alumina surface were studied in 5 vol% solid suspensions containing polyacrylic ammonium (PAA). The amount of alumina dissolved was higher in acidic suspensions than in neutral or basic suspensions. The solubility of alumina in the wide pH range from 2.5 to 9.3 decreased with the addition of PAA. The amount of MG^<2+> ions adsorbed onto alumina surface depended on two factors of pH and PAA content of suspensions. Negatively charged alumina surface in the pH range from 7.6 to 9.3 adsorbed Mg^<2+> ions of 17.5μmol/m^2-alumina surface. Positively charged alumina surface adsorbed little Mg^<2+> ions in acidic suspensions. The amount of Mg^<2+> ions adsorbed onto alumina surface increased in acidic or neutral suspensions and decreased in basic suspensions by addition of PAA.
社団法人日本セラミックス協会の論文
1996-04-01