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利用声波粒度仪研究Mg2+在Al2O3表面的特性吸附

孙静; 高濂   

  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:2001-02-22 修回日期:2001-05-10 出版日期:2001-11-20 网络出版日期:2001-11-20

Using Acoustosizer to Study the Specific Adsorption of Magnesium Ions onto Alumina

SUN Jing; GAO Lian   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ce- ramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-02-22 Revised:2001-05-10 Published:2001-11-20 Online:2001-11-20

摘要: 利用声波粒度仪、Zeta电位仪详细研究了金属镁离子在氧化铝粉体表面的特性吸附行为.发现Mg2+浓度、体系pH以及浆料的固体含量都对氧化铝颗粒表面的Zeta电位有显著影响,在不同的实验条件下引起粉体颗粒表面电荷的反转或等电点的位移.不同pH条件下的粒度测量结果所反映的体系稳定性与Zeta电位较好的吻合.首次用AFM证实了特性吸附条件下,氧化物表面水化层的存在.

关键词: 氧化铝, 镁离子, 胶态成型, 特性吸附, 声波粒度仪

Abstract: The detailed electroacoustic behaviors for alumina in salt concentration of magnesium ions were determined as a function of metal ion concentration, pH, and volume content of solid. The charge reversal and the shifts of the isoelectric points were observed. The particle size distributions corresponded well to the zeta potential values. Atomic Force Microscope was used to verify the metal hydroxide coating, formed at the interface. The thickness of the coating layer was about 4nm, corresponding to 10~12 monolayers.

Key words: alumina, magnesium ions, colloidal processing, specific adsorption, acoustosizer

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