Polysilazane-induced aggregation of hydrophobic silver colloids

被引：5
作者：
Bakumov, Vadym [1 ,2 ]
Kroke, Edwin [1 ]
机构：
[1] Tech Univ Bergakad Freiberg, Inst Inorgan Chem, D-09596 Freiberg, Germany
[2] Univ Konstanz, Dept Chem, D-78462 Constance, Germany
来源：
LANGMUIR | 2008年 / 24卷 / 19期
关键词：
D O I：
10.1021/la801104b
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Adsorbing polymers such as polysilazanes induce irreversible coagulation of hydrophobic silver colloids in nonpolar solvents. This is accompanied by broadening of the surface plasmon resonance (SPR) peak. A method to analyze the coagulation kinetics based on von Smoluchowski's theory utilizing the SPR change is described. The approach allows evaluating extinction spectra of aggregates of small sizes. A model for polymer adsorption kinetics in combination with a modified bridging efficiency model explains the observed coagulation inhibition over time in terms of macromolecules adsorption, spreading, and mutual repulsion.
引用
收藏
页码：10709 / 10716
页数：8
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