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    Electrostatic adsorption of hematite nanoparticles on self-assembled monolayer surfaces

    Year: 2013

    Journal: Journal of Nanoparticle Research July 2013, 15:1873, 20131004

    Authors: Boris L. T. Lau 1 3, Rixiang Huang 1, Andrew S. Madden 2

    Last authors: Andrew S. Madden

    Organizations: 1. Department of Geology, Baylor University, One Bear Place #97354, Waco, TX, 76798, USA 2. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, 224 Marston Hall, 130 Natural Resources Road, Amherst, MA, 01003-9293, USA 3. School of Geology and Geophysics, University of Oklahoma, Norman, OK, 73019, USA

    Country: USA, US, United States, United States of America, America

    Deposition of nanoparticles (NPs) on different environmental surfaces has important implication on their fate and transport in aquatic systems. This study quantitatively and kinetically analyzed the adsorption of hematite (α-Fe2O3) NPs (HNPs) onto self-assembled monolayer modified surfaces using QCM, AFM, and SEM. Experiments were conducted to study the immobilization of two different sizes of HNPs onto gold substrate and surfaces modified with 1-mercapto-11-undecanoic acid and cysteine. It is shown that the extent and rate of HNPs adsorption onto substrate surfaces can be modulated electrostatically. Control over the surface coverage of the adsorbed HNPs has been demonstrated by pH variation. Size-dependent adsorption kinetics was observed, with the 79 nm HNPs adsorbed 2–3 times faster than the 116 nm HNPs.