Contact
    Start Publications Carboxymethyl cellulose binding to mineral substrates: ...
    ←  Publication Finder
    QSense

    Carboxymethyl cellulose binding to mineral substrates: Characterization by atomic force microscopy–based Force spectroscopy and quartz-crystal microbalance with dissipation monitoring

    Year: 2013

    Journal: Journal of Colloid and Interface Science Volume 402, 15 July 2013, Pages 58–67, 20130629

    Authors: Erica Pensini a, Christopher M. Yip b, Denis O’Carroll c, Brent E. Sleep a,

    Last authors: Brent E. Sleep

    Organizations: a Department of Civil Engineering, University of Toronto, Toronto, ON, Canada M5S 1A4 b Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada M5S 3E1 c Western University, London, ON, Canada N6A 5B9

    Country: Canada

    The attachment of the sodium salt of carboxymethyl cellulose (CMC) onto iron oxide and various silicate substrates in aqueous solution as a function of salt concentration and pH was studied by atomic force microscopy–based force spectroscopy (AFM) and quartz-crystal microbalance with dissipation monitoring (QCM-D). Both ionic strength and cation valency were found to influence substrate binding. Notably, QCM-D experiments strongly suggested that the solubility of CMC is directly impacted by the presence of CaCl2. Such data are critical for the design of new molecules for stabilizing mineral floc dispersions and for assessing the mobility of CMC-coated particles in the subsurface. Modeling of AFM data with an extended Ohshima theory showed that van der Waals and steric forces played a major role in the interactions between CMC and mineral substrates, and that hydration forces were also important.