Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (20): 2025-2029. Previous Articles     Next Articles

电解质对Mg-Al HTlc溶胶聚集动力学行为的影响

金志琳1, 侯万国1, 戴国亮2, 孙德军1, 张春光1, 孙祉伟2   

  1. 1. 山东大学胶体与界面化学教育部重点实验室, 济南, 250100;
    2. 中国科学院力学研究所, 国家微重力实验室, 北京, 100080
  • 收稿日期:2003-08-20 修回日期:2004-06-16 出版日期:2004-10-28 发布日期:2014-02-17
  • 通讯作者: 侯万国,E-mail:wghou@sdu.edu.cn E-mail:wghou@sdu.edu.cn
  • 基金资助:
    国家自然科学基金(No.20273041)和教育部跨世纪人才基金资助项目.

Effect of Electrolytes on Kinetic Behavior of Colloidal Dispersions of Mg-Al Hydrotalcite-Like Compounds

JIN Zhi-Lin1, HOU Wan-Guo1, DAI Guo-Liang2, SUN De-Jun1, ZHANG Chun-Guang1, SUN Zhi-Wei2   

  1. 1. Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shandong University, Jinan 250100;
    2. National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080
  • Received:2003-08-20 Revised:2004-06-16 Online:2004-10-28 Published:2014-02-17

Colloidal stability and aggregation kinetics of the Mg-Al HTlc dispersion were investigated at various electrolyte concentrations by dynamic light scattering (DLS). It was found that the Mg-Al HTlc dispersions go through mostly stable, slow aggregating and fast aggregating stages in turn with the increase of the inertia electrolyte concentration (NaCl, NaNO3), while those phenomena do not occur in the dispersions with various NaOH concentrations (0~4 mmol/L) in our studies. The critical electrolyte concentrations of NaCl and NaNO3 for this Mg-Al HTlc dispersion are found to be 127 and 180 mmol/L respectively. The relations between the stability ratio and the concentration of NaCl, NaNO3 and NaOH in the slow aggregating stage have been measured to be logW=10.18-4.44logC, logW=11.98-4.79logC and logW=1.92-0.74logC, respectively. The aggregation of this dispersion has been induced much more easily by NaOH than by NaCl or NaNO3.

Key words: aggregation kinetics, dynamic light scattering(DLS), ζ-potential, hydrotalcite-like compound(HTlc)