中华医学超声杂志

应用化学 ›› 1998, Vol. 0 ›› Issue (6): 6-10.

• 研究论文 • 上一篇    下一篇

表面活性剂和聚乙烯吡咯烷酮在ZrO2上的吸附对其悬浮体稳定性的影响

赵振国, 钱程, 王青, 刘迎清   

  1. 北京大学物理化学研究所 北京100871
  • 收稿日期:1998-03-30 修回日期:1998-08-10 出版日期:1998-12-10 发布日期:1998-12-10
  • 基金资助:
    国家自然科学基金(29576224)

Effect of Adsorption of Surfactants and Polyvinylpyrrolidone on the Stability of ZrO2 Suspension

Zhao Zhenguo, Qian Cheng, Wang Qing, Liu Yingqing   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1998-03-30 Revised:1998-08-10 Published:1998-12-10 Online:1998-12-10

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摘要： 研究了水溶液中十二烷基苯磺酸钠(SDBS)、溴代十四烷基吡啶(TPB)和聚乙烯吡咯烷酮(PVP)在ZrO2上的吸附及对ZrO2水悬浮体稳定性的影响。结果表明：pH=2.4时SDBS在ZrO2上的吸附等温线为LS型,pH=7.0时TPB的吸附等温线为S型,吸附等温线与ZrO2粒子ζ电势变化曲线有大体一致的关系。在最大吸附量时ZrO2粒子ζ电势较大,且吸附的表面活性剂离子形成大部分亲水基朝向水相的表面胶团。这两种因素都使ZrO2悬浮体稳定性提高。PVP在ZrO2上的吸附量较小,相对而言在带正电荷的ZrO2上比在带负电荷的ZrO2上吸附量和吸附层厚度大。在PVP浓度很低时因吸附分子的“搭桥”作用使ZrO2悬浮体稳定性下降,而浓度高时聚合物的空间稳定作用可使悬浮体稳定性提高.

关键词: 十二烷基苯磺酸钠, 溴代十四烷基吡啶, 聚乙烯吡咯烷酮, ZrO2, 吸附, 悬浮体稳定性

Abstract: The adsorption of sodium dodecylbenzene sulfonate(SDBS), tetradecyl pyridine bromide(TPB) and polyvinyl pyrrolidone(PVP) onto the ZrO2 particles in aqueous solutions and the effect of the adsorption on the stability of ZrO2 suspension have been studied. The results show that the isotherms are of LS type for SDBS at pH 2.4 and of S type for TPB at pH 7.0, respectively. The adsorption isotherms for both surfactants are roughly identical with potential changecurves of ZrO2 particles: at maximum adsorption ZrO2 has greater potential value and the adsorbed surfactant ions form surface micells with more parts of their hydrophilic groups being towards water phase, increasing the stability of ZrO2 suspension. The amount of PVP adsorbed on the positively charged ZrO2 is greater than that on the negatively charged ZrO2. In concentrated PVP solution the ZrO2 suspension has higher stability.

Key words: sodium dodecylbenzene sulfonate, tetradecylpyridine bromide, polyvinylpyrrolidone, ZrO2, adsorption, suspension stability

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