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    In situ adsorption densities of polyacrylates on hematite nano-particle films as determined by ATR-FTIR spectroscopy

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    Access Status
    Open access
    Authors
    Van Bronswijk, Wilhelm
    Kirwan, Luke
    Fawell, Phillip
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Van Bronswijk, Wilhelm and Kirwan, Luke and Fawell, Phillip. 2006. In situ adsorption densities of polyacrylates on hematite nano-particle films as determined by ATR-FTIR spectroscopy. vibrational spectroscopy 41: 176-181.
    Source Title
    vibrational spectroscopy
    DOI
    10.1016/j.vibspec.2005.12.007
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    Remarks

    Copyright 2006 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/32962
    Collection
    • Curtin Research Publications
    Abstract

    The adsorption of polymers is typically characterised by segments of adsorbed "trains" and unadsorbed "loops" and "tails". Attenuated total reflectance infrared spectroscopy is thus an ideal means of studying this process in situ. In this study the adsorption of long chain polyacrylates onto hematite at pH 2 and 13 has been examined using a single bounce Horizontal-ATR cell. The crucial parameters that affect surface adsorbed densities obtained by this method are the depth of penetration and effective path length of the evanescent wave, and the infrared absorbtivities of the free and bound polyacrylate. The former require a detailed knowledge of the optical properties of the interface (refractive indices, incidence angles and polarisation fraction) whilst the latter can only be approximated, as it is not possible to measure the infrared absorptivity, nor the refractive index, of adsorbed polyacrylate independently. The results obtained show that only ~2-10% of the polymer chain is adsorbed, thereby confirming the "loops, tails and trains" mode of adsorption, and that higher molecular weight polyacrylates adsorb with a lower fraction of adsorbed segments.

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