Stable Oxide Nanoparticle Clusters Obtained by Complexation

Details Stable Oxide Nanoparticle Clusters Obtained by Complexation Stable Oxide Nanoparticle Clusters Obtained by Complexation

2006-08-08

arxiv.org/abs/cond-mat/0608189v1

Journal of Colloid and Interface Science 303 (2006) 315-318

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures, to appear in JCIS

Scientific paper

10.1016/j.jcis.2006.07.025

We report on the electrostatic complexation between polyelectrolyte-neutral copolymers and oppositely charged 6 nm-crystalline nanoparticles. For two different dispersions of oxide nanoparticles, the electrostatic complexation gives rise to the formation of stable nanoparticle clusters in the range 20 - 100 nm. It is found that inside the clusters, the particles are pasted together by the polyelectrolyte blocks adsorbed on their surface. Cryo-transmission electronic microscopy allows to visualize the clusters and to determine the probability distributions functions in size and in aggregation number. The comparison between light scattering and cryo-microscopy results suggests the existence of a polymer brush around the clusters.

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