Time-Resolved Small-Angle X-ray Scattering Studies of Polymer-Silica Nanocomposite Particles: Initial Formation and Subsequent Silica Redistribution

被引：36

作者：

Balmer, Jennifer A. ^{[1
]}

Mykhaylyk, Oleksandr O. ^{[1
]}

Armes, Steven P. ^{[1
]}

Fairclough, J. Patrick A. ^{[1
]}

Ryan, Anthony J. ^{[1
]}

Gummel, Jeremie ^{[2
]}

Murray, Martin W. ^{[3
]}

Murray, Kenneth A. ^{[3
]}

Wiliams, Neal S. J. ^{[3
]}

机构：

[1] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] AkzoNobel, Slough SL2 5DS, Berks, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

COLLOIDAL NANOCOMPOSITES; SEQUENTIAL ADSORPTION; KINETICS; GROWTH; NANOPARTICLES; NUCLEATION; DEPOSITION; LATEXES; ROUTE; SAXS;

D O I：

10.1021/ja106924t

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Small angle X-ray scattering (SAXS) is a powerful characterization technique for the analysis of polymer silica nanocomposite particles due to their relatively narrow particle size distributions and high electron density contrast between the polymer core and the silica shell. Time-resolved SAXS is used to follow the kinetics of both nanocomposite particle formation (via silica nanoparticle adsorption onto sterically stabilized poly(2-vinylpyridine) (P2VP) latex in dilute aqueous solution) and also the spontaneous redistribution of silica that occurs when such P2VP silica nanocomposite particles are challenged by the addition of sterically stabilized P2VP latex. Silica adsorption is complete within a few seconds at 20 degrees C and the rate of adsorption strongly dependent on the extent of silica surface coverage. Similar very short time scales for silica redistribution are consistent with facile silica exchange occurring as a result of rapid interparticle collisions due to Brownian motion; this interpretation is consistent with a zeroth-order Smoluchowski-type calculation.

引用

页码：826 / 837

页数：12

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