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无机材料学报

无机材料学报

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PBTCA稳定Al2O3悬浮液及沉积物分形特性的研究

刘阳桥; 高濂; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室, 上海 200050
  • 收稿日期:1999-10-22 修回日期:1999-11-19 出版日期:2000-10-20 网络出版日期:2000-10-20

Dispersing Effect of PBTCA for Alumina Suspension and the Fractal Characteristics of the Sediments

LIU Yang-Qiao; GAO Lian; GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics & Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-10-22 Revised:1999-11-19 Published:2000-10-20 Online:2000-10-20

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摘要： 测定了２－膦酸丁烷－１；２，４－三羧酸（ＰＢＴＣＡ）的电离特性，并通过Ｚｅｔａ电位、粒径分布、沉降、比表面积等手段研究其在Ａｌ２Ｏ３表面的吸附及其对电动特性和稳定性的影响．结果表明；ＰＢＴＣＡ在Ａｌ２Ｏ３表面发生化学吸附，并能显著提高颗粒表面的带电量，从而改善浆料的稳定性．ＦＴＩＲ研究表明；羧基及磷酸基均参与了ＰＢＴＣＡ在Ａｌ２Ｏ３表面的化学吸附，从而提高了吸附强度．通过对沉积物表面ＳＥＭ照片的灰度分析发现，其表面形貌具有分形特征，且悬浮液的稳定性越好，沉积物表面的分维值Ｄｆ越大．

关键词: 氧化铝, 2-膦酸丁烷-1, 2, 4-三羧酸, 吸附, 分维值

Abstract: 2-phosphonobutane-1,2,4-tricarboxylic acid was used as a dispersant for alumina suspensions. Zeta potential, FTIR, effective diameter，specific
surface area and sedimentation behaviour were studied. It was found that both the phosphonyl and the carboxyl groups participated in the chemical
interaction of PBTCA with alumina. Settling experiments revealed the excellent dispersing ability of PBTCA. The fractal theory was employed
to analyse the surface morphology of sediments. It was showed that the fractal dimension value was closely related to the suspension stability.

Key words: alumina, 2-phosphonobutane-1,2,4-tricarboxylic acid, adsorption, fractal dimension

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