Formation of rodlike silica aggregates directed by adsorbed thermoresponsive polymer chains

Langmuir : the ACS Journal of Surfaces and Colloids
David BabayanJulien Hernandez

Abstract

This study deals with the fine-tuning of the interactions between silica nanoparticles and a LCST polymer in order to build permanent rigid linear aggregates. LCST polymers become hydrophobic and collapse above a critical temperature. The collapse of the polymer chains at the surface of the silica particles generates an attractive potential that can overcome the repulsive electrostatic forces between the silica particles under certain circumstances. The combined use of the thermoresponsiveness of poly(ethylene oxide) and of the chemical condensation properties of silica enables us to build permanent rigid aggregates displaying rodlike shapes just by increasing the temperature. These aggregates have been characterized using two complementary techniques: transmission electron microscopy and small angle neutron scattering. For low curing time, it appears that small linear aggregates are obtained when the electrostatic surface potential (pH = 8.5) is high and the initial ionic strength is low (I approximately = 10(-3) M). For higher heating time these objects aggregate further leading to some branching and ultimately to 3D gels which phase separate.

References

Oct 7, 2004·Journal of Colloid and Interface Science·Alvin Y Huang, John C Berg
Nov 27, 2004·Nature·Anna StradnerPeter Schurtenberger
Jul 22, 2008·Nature Materials·Jiayin YuanAxel H E Müller
Feb 5, 2009·The Journal of Chemical Physics·J Richardi

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Citations

Jul 7, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Bhuvnesh BhartiGerhard H Findenegg
Jan 31, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Sugam KumarP Callow
Sep 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Shujun ZhouTatsuya Okubo
May 8, 2013·Chemistry : a European Journal·Jia-Yuan ShiSheng-Quan Fu
Jun 13, 2018·Soft Matter·Anne-Caroline Genix, Julian Oberdisse
Jun 5, 2019·Macromolecular Rapid Communications·Yusheng GuoBhuvnesh Bharti
Nov 17, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Junzheng WangTatsuya Okubo
Apr 30, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Solenn MoroJean-Baptiste d'Espinose de Lacaillerie

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