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    Polymerized Rodlike Micelle Adsorption at the Solid-Liquid Interface

    Year: 2007

    Journal: Langmuir 2007, 23, 8094-8102, 20100827

    Authors: Biggs S * †, Labarre M. †, Hodges C. †, Walker L.M. ‡, Webber G.B †

    Last authors: Grant B. Webber

    Organizations: Institute of Particle Science and Engineering, The School of Process, Environmental and Materials Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom, and Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon UniVersity, Pittsburgh, PennsylVania 15213

    Country: USA, US, United States of America

    The adsorption of rodlike polymer-micelle aggregates of cetyltrimethylammonium 4-vinylbenzoate (p-C16TVB) at the silica-water interface has been characterized using a combination of quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM) studies. Adsorption isotherm data, recorded by QCM-D, indicate a two-stage mechanism: an adsorbed film of free CTA+ ions is initially produced at low concentrations until the surface is charge reversed, whereupon the weakly anionic aggregates can adsorb and the adsorbed mass is seen to increase dramatically. The adsorbed rodlike micelle aggregates are seen to form a close-packed monolayer from AFM images with a high degree of order over micrometer length scales. AFM force-distance data indicate that the adsorbed aggregates retain their cylindrical structure and little or no flattening is seen. Rinsing of the film did not result in removal of the adsorbed layer, and the persistence of these nanoscale ordered films at the solid-liquid interface suggests many possible applications.