电解质对Mg-Al HTlc溶胶聚集动力学行为的影响

化学学报 ›› 2004, Vol. 62 ›› Issue (20): 2025-2029. 上一篇下一篇

研究论文

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. 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

投稿日期:2003-08-20 修回日期:2004-06-16 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. 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 Published:2014-02-17

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摘要/Abstract

采用动态光散射法研究了电解质对Mg-A1类水滑石(HTlc)溶胶聚集动力学行为的影响,发现随惰性电解质(NaCl,NaNO₃)浓度的增大,Mg-A1 HTlc溶胶经历稳定、慢速聚集和快速聚集三个区域,而特性吸附电解质(NaOH)在所研究的浓度范围(0～4 mmol/L)内未观察到快速聚集.NaCl和NaNO₃的临界聚沉浓度分别为127和180mmol/L,慢速聚集区稳定比与NaCl,NaNO₃和NaOH浓度间的关系式分别为:logW=10.18-4.44logC,logW=11.98-4.79logC,logW=1.92-0.74logC.NaOH诱导体系聚集的能力大大高于NaCl和NaNO₃.

关键词: 聚集动力学, 动态光散射, ζ电势, 类水滑石化合物

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)

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金志琳, 侯万国, 戴国亮, 孙德军, 张春光, 孙祉伟. 电解质对Mg-Al HTlc溶胶聚集动力学行为的影响[J]. 化学学报, 2004, 62(20): 2025-2029.

JIN Zhi-Lin, HOU Wan-Guo, DAI Guo-Liang, SUN De-Jun, ZHANG Chun-Guang, SUN Zhi-Wei. Effect of Electrolytes on Kinetic Behavior of Colloidal Dispersions of Mg-Al Hydrotalcite-Like Compounds[J]. Acta Chimica Sinica, 2004, 62(20): 2025-2029.

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电解质对Mg-Al HTlc溶胶聚集动力学行为的影响

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

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