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无机材料学报

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Tiron对纳米Al2O3悬浮液性能的影响

江琳沁; 高濂; 刘阳桥; 孙静

  

  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:2001-12-03 修回日期:2002-01-28 出版日期:2003-01-20 网络出版日期:2003-01-20

Effect of Tiron on the Properties of Nano-sized Al2O3 Suspension

JIANG Lin-Qin; GAO Lian; LIU Yang-Qiao; SUN Jing   

  1. State Key Lab of High Performance Ceramics &; Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-12-03 Revised:2002-01-28 Published:2003-01-20 Online:2003-01-20

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摘要： 以1,2-二羟基苯-3,5-二磺酸钠(Tiron)为分散剂获得了平均粒径约为57nm的氧化铝粉体的稳定悬浮液.通过测定等温吸附曲线及悬浮液的Zeta电位,研究了Tiron对粉体表面特性的影响.结果表明,Tiron在Al2O3表面发生化学吸附,磺酸基的离解使胶粒表面电荷更负,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:Tiron分子结构中两个相邻羟基与Al-OH形成内环结构,从而提高了吸附强度.流变测试确定了制备高固含量稳定浆料在pH=8.5时所需的最佳分散剂用量为0.8wt％.

关键词: 氧化铝, 1, 2-二羟基苯-3, 5-二磺酸钠, 吸附, FTIR

Abstract: Tiron (1,2-dihydroxy-3,5-benzenedisulfonic acid sodium salt) was used as a dispersant for nano-sized alumina suspensions. Surface chemistry of the suspensions
was evaluated via isotherm adsorption and ζ potential measurements. FTIR was used to probe the adsorption mechanism. It was found that the strong adsorption
should be due to the formation of an inner sphere complex between metal ions on the surfaces and alcohol groups of Tiron. With two sulfate groups, Tiron addition in the suspension led to a higher density of negative charge. The rheological
measurements of Al2O3 suspensions indicated that the optimum content of Tiron was 0.8wt% at pH=8.5.

Key words: alumina, l, 2-dihydroxy-3, 5-benzenedisulfonic acid sodium salt, adsorption, FTIR

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