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Ionic-like Behavior of Oppositely Charged Nanoparticles

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Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208
Cite this: J. Am. Chem. Soc. 2006, 128, 47, 15046–15047
Publication Date (Web):November 4, 2006
Copyright © 2006 American Chemical Society

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    Mixtures of oppositely charged nanoparticles of various sizes and charge ratios precipitate only at the point of electroneutrality. This phenomenonspecific to the nanoscale and reminiscent of threshold precipitation of ionsis a consequence of the formation of core-and-shell nanoparticle aggregates, in which the shells are composed of like-charged particles and are stabilized by efficient electrostatic screening.


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    Synthesis of the NPs and short summaries of the DLS measurements and electrodynamic Mie calculations. This material is available free of charge via the Internet at

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