Controlled, simultaneous assembly of polyethylenimine onto nanoparticle silica colloids

Langmuir : the ACS Journal of Surfaces and Colloids
Joseph F BringleyJames M Hewitt

Abstract

A novel precision-assembly methodology is described on the basis of the controlled, simultaneous assembly (CSA) of a core nanoparticle substrate and polyelectrolyte solutions. The method is capable of assembly rates at least as fast as 10(16) core particles s(-1) L(-1) and affords concentrated suspensions of stable colloids with an adsorbed polyelectrolyte. The resulting dispersions are highly homogeneous, have a low viscosity and narrow particle-size distribution, and are stable colloids, even at solid concentrations of at least 33 wt %. The adsorption isotherm and the saturation adsorption for polyethylenimine (PEI) assemblies onto a 15 nm silica colloid have been evaluated with 1H NMR spectroscopy. The saturation adsorption is highly dependent upon the pH at assembly and is given by the equation PEIa (micromol m(-2)) = 1.73pH - 1.89, R2 = 0.986, where micromoles refers to the concentration of the EI monomer. The saturation concentration increases from 6.8 micromol m(-2) at pH 5.0 to 13.7 micromol m(-2) at pH 9.0. The adsorbed polyelectrolyte may be cross-linked and thereby permanently fixed to the colloid surface to prepare nanoparticle-polyelectrolyte colloidal assemblies having enhanced colloid stability, high homogeneity,...Continue Reading

References

Jan 7, 2003·Nature Medicine·Ralph Weissleder, Vasilis Ntziachristos
Mar 12, 2003·Advanced Drug Delivery Reviews·Hidenori OtsukaKazunori Kataoka
Dec 5, 2003·Journal of the American Chemical Society·Byron D Gates, George M Whitesides
Sep 4, 1998·Angewandte Chemie·Edwin DonathHelmuth Möhwald

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Citations

Jan 15, 2008·Journal of Colloid and Interface Science·Joseph F BringleyLaura Buonemani
Jun 10, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Kunihiro IchimuraHaruhisa Akiyama
Jul 20, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Robert SchlapakStefan Howorka
Aug 7, 2010·The Journal of Physical Chemistry. B·Kamendra P SharmaGuruswamy Kumaraswamy
Oct 30, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Motoyuki Iijima, Hidehiro Kamiya

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