カオリンの水中における分散状態におよぼすコンドロイチン硫酸イオン添加の効果

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The mean diameter, d_m, of aggregated kaolin particles was measured by the sedimentation balance method in aqueous solution of various concentrations of chondroitin sulfate (Ch.) and/or of simple salt. It was found that d_m decreases with increasing concentration of Ch. or of simple salt, because the adsorption of Ch. on kaolin disrupts the card-house structure of kaolin particles and because a simple salt shields the electrostatic attractive force between the face (negatively charged) and the edge (positively charged) of kaolin particles at low concentration of the salt, although the d_m of kaolin particles becomes large at sufficiently high concentration of the simple salt by aggregation of kaolin particles. The d_m is also affected by the sequence of mixing of Ch. and simple salt ; the d_m is smaller in the case Ch. is added before simple salt, than when added after simple salt. The mean diameter, d_m, of kaolin particles increases with pH when adjusted with Ca(OH)_2,but decreases with pH when adjusted with NaOH. It was found that the amount of calcium ion adsorbed increases with pH. It was, therefore, concluded that calcium ions bind kaolin particles face-to-face by the adsorption of calcium ions on the face of kaolin. It was also found that OH ions are adsorbed on kaolin particles, and then pH of the suspension decreases to some value, depending on both the concentration and species of the salt added. This may be called a buffer action of kaolin.
公益社団法人日本薬学会の論文
1978-04-25

カオリンの水中における分散状態におよぼすコンドロイチン硫酸イオン添加の効果

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