Intelligent colloidal hybrids via reversible pH-induced complexation of polyelectrolyte and silica nanoparticles

被引：104

作者：

Mori, H

Müller, AHE

Klee, JE

机构：

[1] Univ Bayreuth, Lehrstuhl Makromol Chem 2, D-95440 Bayreuth, Germany

[2] Univ Bayreuth, Bayreuther Zentrum Kolloide & Grenzflachen, D-95440 Bayreuth, Germany

[3] Dentsply DeTrey GmbH, D-78467 Constance, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2003年 / 125卷 / 13期

关键词：

D O I：

10.1021/ja0297887

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present novel intelligent colloidal polymer/silica nanocomposites, in which the complexation of cationic silica nanoparticles and a weak anionic polyelectrolyte can be manipulated simply by pH change through a hydrogen-bonding interaction and ionic complexation caused by hydrogen-transfer interactions between the constituents. Special silica particles which have nanometer size (diameter ≈ 3.0 nm) and two independent proton-accepting sites were developed in this study. Both the silica and poly(acrylic acid) form transparent colloidal solutions in water, while a white turbid dispersion was obtained just after mixing the two solutions due to the complexation. The pH-induced association-dissociation behavior was confirmed by the turbidity and potentiometric titration measurements. The assembled structures of the hybrids were visualized by scanning force microscopy. Copyright © 2003 American Chemical Society.

引用

页码：3712 / 3713

页数：2

共 16 条

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