Mechanism and control of adhesion and dispersion of fine particles

细颗粒附着与分散的机理及控制

• 批准号: 05650754
• 负责人: KOUSAKA Yasuo
• 金额: $ 1.34万
• 依托单位: University of Osaka Prefecture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650754/
• 关键词: Agregate particle; Liquid bridge; Dispersion force; Adhesion force; van der Waals force; 固体架橋; ファン・デル・ワールスカ; 粒子間付着力; 湿度

Formation of aggregates difficult to disperse is considerably facilitated as the primary particle size decreases. The mechanisms of adhesion and dispersion of fine particles, which are far from being well understood, have been studied both theroretically and experimentally. The main results are breifly summarized below.1. The mechanism of formation of liquid bridges between two different-sized spherical particles has been examined. Both the liquid bridge profiles and the adhesion force can be quantitatively predicted from the concentration of soluble impurities in the liquid, the particle diameter and the humidity.2. In drying processes, the equilibrium moisture content of powdery materials can be controlled through adjustment of the concentration of soluble impurities.3. The adhesion force arising from the solid salt bridge remaining after drying of the liqued bridge is a function of the original concentration of salt in liquid, the particle diameter and the surrounding humidity after drying.4. The mechanism of dispersion of coagulated particles in water under acceleration and shear flow has also been clarified. In this case, dispersion of the agglomerated particles can be controlled by the surface potential around the particles and the pH of the suspension.

随着初级粒度的减小，显著促进难以分散的聚集体的形成。细颗粒的粘附和分散机理目前还没有很好的认识，但人们已经从理论和实验两个方面对其进行了研究。主要结果概括如下：1.研究了两种不同粒径球形颗粒间液桥的形成机理。根据液相中可溶性杂质的浓度、颗粒的粒径和湿度，可以定量地预测液桥形态和粘附力.在干燥过程中，可以通过调节可溶性杂质的浓度来控制粉状物料的平衡含水率.由液体桥干燥后残留的固体盐桥产生的粘附力是液体中盐的原始浓度、颗粒直径和干燥后周围湿度的函数。并阐明了加速剪切流作用下凝聚颗粒在水中的分散机理。在这种情况下，可以通过颗粒周围的表面电势和悬浮液的pH来控制附聚颗粒的分散。

项目成果

遠藤禎行: "気流の加速による凝集粒子の分散-分散媒体を用いた新しい手法-" 化学工学論文集. 19. 698-701 (1993)

Yoshiyuki Endo：“通过加速气流分散聚集颗粒 - 使用分散介质的新方法 -”化学工程杂志 19. 698-701 (1993)。

遠藤禎行: "異径2球間に形成される液架橋現象とその付着力の解析" 化学工学論文集. 19. 1128-1135 (1993)

Yoshiyuki Endo：“不同直径的两个球体之间形成的液桥现象及其粘附力的分析”化学工程杂志 19. 1128-1135 (1993)。

遠藤禎行: "架橋液乾燥後に形成される塩類の固体架橋による付着力" 化学工学論文集. 20. 542-548 (1994)

Yoshiyuki Endo：“交联液体干燥后形成的盐的固体交联产生的粘合力”化学工程杂志 20. 542-548 (1994)。

Endo, Y.: "Analysis of Liquid Bridge Formation and Adhesion Force between Two Particles of Different Sizes" Kagaku Kogaku Ronbunshu. 19. 1128-1135 (1993)

Endo, Y.：“不同尺寸的两个颗粒之间的液桥形成和粘附力的分析”Kagaku Kogaku Ronbunshu。

遠藤禎行: "2粒子間に液架橋が形成されたときの粒子間間隙の解析" 化学工学論文集. 19. 1136-1142 (1993)

Yoshiyuki Endo：“两个颗粒之间形成液桥时颗粒间间隙的分析”化学工程杂志 19. 1136-1142 (1993)。