高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (6): 1052.

• 论文 • 上一篇    下一篇

带相反电荷胶体颗粒混和悬浮体的流变学性能

郭培志, 孙德军, 金志琳, 张春光   

  1. 山东大学胶体与界面化学研究所, 胶体与界面化学教育部重点实验室, 济南 250100
  • 收稿日期:2002-09-10 出版日期:2003-06-24 发布日期:2003-06-24
  • 通讯作者: 孙德军(1965年出生),男,教授,主要从事分散体系流变学研究.E-mail:djsun@sdu.edu.cn E-mail:djsun@sdu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20043002);教育部科学技术研究重点项目(批准号:02128);山东省自然科学基金(批准号:Y2001B01)资助

Rheological Properties of Mixed Suspensions Containing Oppositely Charged Colloidal Particles

GUO Pei-Zhi, SUN De-Jun, JIN Zhi-Lin, ZHANG Chun-Guang   

  1. Key Lab for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, China
  • Received:2002-09-10 Online:2003-06-24 Published:2003-06-24

PDF (PC)

被引次数

7

摘要： 研究了带相反电荷的粘土颗粒和MMH(铝、镁混合金属氢氧化物)颗粒形成的混和悬浮体的流变学性能,考察了盐对混合体系流变学性能的影响.结果表明,当粘土质量分数为1%时,悬浮体为牛顿型流体;当质量分数升至2%时,悬浮体表现出固体的弹性响应;特定粘土含量的悬浮体中,随着MMH量的增加,混合体系的屈服值和弹性模量亦增加,表明凝胶结构增强.向混合体系中加入NaCl,弹性模量、屈服值和粘度等流变参数均降低.与单组分粘土悬浮体或MMH悬浮体相比,双组分混合体系的结构恢复很快.

关键词: 粘土, 混合金属氢氧化物, 触变性, 流变学, 悬浮体

Abstract: The rheological properties of single-component clay dispersions and clay/MMH mixed dispersions containing oppositely charged colloidal particles have been investigated. As the clay concentration is increased, the clay suspensions develop from the newtonian form of flow behavior to a yielding type of response. Atw(clay) is between 2%-4%, upon addition of MMH to clay dispersions, the magnitude of yield value and storage modulus increase monotonically, indicating enhanced gel strength. Adding NaCl to clay/MMH mixed suspensions causes the decrease of storage modulus, yield values and apparent viscosities. In the structural recovery measurements, the time dependence of viscoelastic properties of clay/MMH mixed dispersions shows only very small variations of the storage moduli over 3 h, in contrast to unusual thixotropic properties of aqueous single-component dispersions of laponite or MMH. The above results are interpreted based on attractive electrostatic interactions between clay and MMH particles due to their opposite charges, similar to the edge(+)/face(-) interactions in single-component clay dispersions under a low pH value.

Key words: Clay, Mixed metal hydroxides, Thixotropy, Rheology, Suspension

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