表面活性剂和聚乙烯吡咯烷酮在 ZrO_2 上的吸附对其悬浮体稳定性的影响  

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

作　　者：赵振国[1] 钱程[1] 王青 刘迎清 

机构地区：[1]北京大学物理化学研究所

出　　处：《应用化学》1998年第6期6-10,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金

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。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 24 and of S type for TPB at pH 70, 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.

关 键 词：SDBS TPB PVB 吸附 悬浮体稳定性 二氧化铬粉体 

分 类 号：TQ174.47[化学工程—陶瓷工业]