Adsorption of polymers and surfactants to the liquid–nanoparticle interface presents a rich set of behaviors depending on the specific materials involved. The surfactant-mediated desorption of polymer from the silica–water interface is demonstrated with a combination of NMR, SANS and DLS; the binding of charged micelles to the adsorbed polymer leads first to an elongation of the polymer chains and a reduction in the near-surface polymer concentration followed, at higher concentrations of surfactant, by desorption of the polymer. The addition of a non-ionic surfactant leads to the formation of mixed micelles and reverses this process.

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Last edited: Friday September 10, 2010

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