Controlled association in suspensions of charged nanoparticles with a weak polyelectrolyte

Langmuir : the ACS Journal of Surfaces and Colloids
Andrew M HoweJulien Leroy

Abstract

The properties of high-pH suspensions of mixtures of silica with low-molecular-weight samples of the water-soluble polymer polyethylenimine (PEI) have been studied. At pH > 10 and low ionic strength, silica nanoparticles are stabilized by a negative surface charge, and PEI has only a very low positive charge. The adsorption of PEI induces a localized positive charge on the segments of polymer closest to the silica surface. The parts of the molecule furthest away from the surface have little charge because of the high pH of the medium. The polymer-covered particle remains negatively charged, imparting some electrostatic stabilization. Suspensions of silica and low-molecular-weight PEI are low-viscosity fluids immediately after mixing, but aggregation occurs leading to the eventual gelation (or sedimentation at lower concentrations) of these mixtures, indicating colloidal instability. The gelation time passes through a minimum with increasing surface coverage. The rate of gelation increases exponentially with molecular weight: for molecular weight > or = 10,000 Da PEI, the instability is so severe that uniform suspensions cannot be produced using simple mixing techniques. The gelation rates increase rapidly with temperature, ioni...Continue Reading

References

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May 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Ramon Pericet-CamaraMichal Borkovec
Jun 15, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Motoyoshi KobayashiMichal Borkovec
Jun 30, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Róbert MészárosTibor Gilányi
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Citations

Mar 22, 2014·Soft Matter·Istvan SzilagyiMichal Borkovec
Sep 9, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·José HierrezueloMichal Borkovec
May 24, 2011·Journal of Colloid and Interface Science·István SzilágyiMichal Borkovec
Apr 2, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Andrea VaccaroMichal Borkovec
Sep 5, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Huan ZhangCharles C Han
Sep 3, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Huan ZhangCharles C Han
Dec 12, 2019·The Journal of Chemical Physics·Jian JiangZhen-Gang Wang
Aug 23, 2008·The Journal of Physical Chemistry. B·Luke J KirwanMichal Borkovec
Apr 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Christopher BalzerZhen-Gang Wang

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