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    Mechanism of the Cooperative Adsorption of Oppositely Charged Nanoparticles†

    Year: 2009

    Journal: J. Phys. Chem. A, 2009, 113 (16), pp 3799–3803, 20100827

    Authors: Tretiakov K.V. ‡, Bishop K.J.M ‡, Kowalczyk B. ‡, Jaiswal A., Poggi M.A., Grzybowski B.A. *‡§

    Last authors: Bartosz A. Grzybowski

    Organizations: Department of Chemical and Biological Engineering and Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, and Q-Sense, 808 Landmark Drive, Suite 124, Glen Burnie, Maryland 21061

    Country: USA, US, United States of America

    Quartz crystal microbalance experiments were performed to study the kinetics of surface adsorption from solutions containing oppositely charged nanoparticles. A theoretical model was developed according to which formation of dense nanoparticle (NP) monolayers is driven by a cooperative process, in which the already-adsorbed NPs facilitate adsorption of NPs from solution. The kinetic rate constants change with the NP solution concentration and can be used to backtrack adsorption free energies. These energies agree with the predictions of a simple DLVO model.