The potential of nano-structured silicon oxide type coatings deposited by PACVD for control of aquatic biofouling

Laurent Akesso, Michala E. Pettitt, James A. Callow, Maureen E. Callow, Joanne Stallard, Dennis Teer, Chen Liu, Su Wang, Qi Zhao, Fraddry D'Souza, Peter R. Willemsen, Glen T. Donnelly, Crtomir Donik, Aleksandra Kocijan, Monika Jenko, Lathe A. Jones, Patricia Calvillo Guinaldo

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    35 Citations (Scopus)

    Abstract

    SiOx-like coatings were deposited on glass slides from a hexamethylsiloxane precursor by plasma-assisted CVD (PACVD). Surface energies (23.1-45.7 mJ m-1) were correlated with the degree of surface oxidation and hydrocarbon contents. Tapping mode AFM revealed a range of surface topologies with Ra values 1.55-3.16nm and RMS roughness 1.96-4.11nm. Settlement of spores of the green alga Ulva was significantly less, and detachment under shear significantly more on the lowest surface energy coatings. Removal of young plants (sporelings) of Ulva under shear was positively correlated with reducing the surface energy of the coatings. The most hydrophobic coatings also showed good performance against a freshwater bacterium, Pseudomonas fluorescens, significantly reducing initial attachment and biofilm formation, and reducing the adhesion strength of attached bacterial cells under shear. Taken together the results indicate potential for further investigation of these coatings for applications such as heat exchangers and optical instruments.

    Original languageEnglish
    Pages (from-to)55-67
    Number of pages13
    JournalBiofouling
    Volume25
    Issue number1
    DOIs
    Publication statusPublished - 2009

    Keywords

    • PACVD
    • silicon oxide
    • biofouling
    • nano-structured surfaces
    • Ulva linza
    • Navicula perminuta
    • Marinobacter hydrocarbonoclasticus
    • Cobetia marina
    • Pseudomonas fluorescens
    • GREEN-ALGA ULVA
    • BARNACLE BALANUS-AMPHITRITE
    • FOULING-RELEASE PROPERTIES
    • STAINLESS-STEEL SURFACES
    • BACTERIAL ADHESION
    • ATTACHMENT STRENGTH
    • ENTEROMORPHA-LINZA
    • DIATOM NAVICULA
    • SETTLEMENT
    • DETACHMENT

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