The hybrids of polystyrene-block-poly(ethylene oxide) micelles and sodium dodecyl sulfate in aqueous solutions:: Interaction with Rh ions and Rh nanoparticle formation

被引:47
作者
Bronstein, LM
Chernyshov, DM
Timofeeva, GI
Dubrovina, LV
Valetsky, PM
Khokhlov, AR
机构
[1] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA
[2] Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 117813, Russia
[3] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 117234, Russia
基金
俄罗斯基础研究基金会;
关键词
polystyrene-block-poly(ethylene oxide); block copolymers; micelles; Rh nanoparticles;
D O I
10.1006/jcis.2000.7085
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The interaction of amphiphilic block copolymer, polystyrene-block-poly(ethylene oxide) (PS-b-PEO), with anionic surfactant, sodium dodecyl sulfate (SDS), in aqueous media has been studied by sedimentation in ultracentrifuge. Three well-defined populations of hybrid aggregates corresponding to micelles, micellar clusters, and supermicellar aggregates were detected in the PS-b-PEO/SDS aqueous solutions at various rotation rates. Parameters of all the micellar aggregates were characterized depending on the SDS loading. An increase in the SDS loading was found to result in an increase in block copolymer/surfactant micelle size and weight at the SDS concentration of 0.8 x 10(-3) mol/L and in a slight decrease of both parameters at critical micelle concentration and at higher concentration. This decrease was caused by incorporation of SDS molecules in block copolymer micelles followed by charging the PS core and repulsion between similar charges. Using dichlorotetrapyridine rhodium(III)chloride hexahydrate ([Rh(Py)(4)Cl-2]Cl x 6H(2)O), ion exchange of surfactant counterions in the hybrid PS-b-PEO/SDS system for Rh cations was carried out, which allowed saturating the micellar structures with Rh species. Subsequent reduction of the Rh-containing hybrid solutions with NaBH4 resulted in the formation of Rh nanoparticles with a diameter of 2-3 nn mainly located in the block copolymer micellar aggregates. (C) 2000 Academic Press.
引用
收藏
页码:140 / 149
页数:10
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