Intelligent colloidal hybrids via reversible pH-induced complexation of polyelectrolyte and silica nanoparticles |
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Authors: | Mori Hideharu Müller Axel H E Klee Joachim E |
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Institution: | Lehrstuhl für Makromolekulare Chemie II and Bayreuther Zentrum für Kolloide und Grenzfl?chen, Universit?t Bayreuth, Germany. hideharu.mori@uni-bayreuth.de |
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Abstract: | 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 approximately 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. |
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