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  • 1.
    Kaur, Simarpreet Pal
    et al.
    University of South Australia, Australia.
    Kempson, Ivan M.
    University of South Australia, Australia.
    Linden, Johan
    RISE - Research Institutes of Sweden, Bioscience and Materials. University of South Australia, Australia.
    Larsson, Mikael
    University of South Australia, Australia; University College London, Australia.
    Nydén, Magnus
    University of South Australia, Australia; University College London, Australia.
    Unhindered copper uptake by glutaraldehyde-polyethyleneimine coatings in an artificial seawater model system with adsorbed swollen polysaccharides and competing ligand EDTA2017In: Biofouling (Print), ISSN 0892-7014, E-ISSN 1029-2454, Vol. 33, no 2, p. 184-194Article in journal (Refereed)
    Abstract [en]

    Shortly after a surface is submerged in the sea, a conditioning film is generally formed by adsorption of organic molecules, such as polysaccharides. This could affect transport of molecules and ions between the seawater and the surface. An artificial seawater model system was developed to understand how adsorbed polysaccharides impact copper binding by glutaraldehyde-crosslinked polyethyleneimine coatings. Coating performance was also determined when competed against copper-chelating EDTA. Polysaccharide adsorption and copper binding and distribution were investigated using advanced analytical techniques, including depth-resolved time-of-flight secondary ion mass spectroscopy, grazing incidence X-ray absorption near-edge spectroscopy, quartz crystal microbalance with dissipation monitoring and X-ray photoelectron spectroscopy. In artificial seawater, the polysaccharides adsorbed in a swollen state that copper readily penetrated and the glutaraldehyde-polyethyleneimine coatings outcompeted EDTA for copper binding. Furthermore, the depth distribution of copper species was determined with nanometre precision. The results are highly relevant for copper-binding and copper-releasing materials in seawater. 

  • 2.
    Larsson, Mikael
    et al.
    University College London, Australia.
    Linden, Johan B
    RISE - Research Institutes of Sweden, Bioscience and Materials. University of South Australia, Australia.
    Kaur, Simarpreet Pal
    University of South Australia, Australia.
    Le Cerf, Brock A.
    University of South Australia, Australia.
    Kempson, Ivan M.
    University of South Australia, Australia.
    Cu K-edge XANES: polymer, organic, inorganic spectra, and experimental considerations2017In: Powder Diffraction, ISSN 0885-7156, E-ISSN 1945-7413, p. 1-5Article in journal (Refereed)
    Abstract [en]

    In pursuit of design and characterisation of Cu adsorbing in thin films, we present data from a large variety of Cu-K edge X-ray Absorption Near Edge Spectroscopy (XANES) spectra obtained from organic and inorganic standards. Additionally, we have explored the impact of beam damage inducing redox alterations. Polymer nanoparticles were tested against films to produce higher concentration samples while maintaining high surface area to bulk effects. Spectra from nanoparticles were highly comparable to thin films of ~8 nm thickness, implying comparable contributions by surface effects on copper association. Finally, we observed no impact on Cu XANES spectra from vitrification with dimethyl sulfoxide to produce amorphous frozen, hydrated samples. The spectra should act as a valuable resource in assisting the design of experiments and identification of copper associations.

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