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

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Author: Akesso, L. · Pettitt, M.E. · Callow, J.A. · Callow, M.E. · Stallard, J. · Teer, D. · Liu, C. · Wang, S. · Zhao, Q. · D'Souza, F. · Willemsen, P.R. · Donnelly, G.T. · Donik, C. · Kocijan, A. · Jenko, M. · Jones, L.A. · Guinaldo, P.C.
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Biofouling, 1, 25, 55-67
Identifier: 241313
Keywords: Biofouling · Cobetia marina · Marinobacter hydrocarbonoclasticus · Navicula perminuta · PACVD · Pseudomonas fluorescens · Silicon oxide · Ulva linza · Dimeticone · Antifouling paint · Hydrophobicity · Plasma enhanced chemical vapor deposition · Silica · Coating · Green algae · Hydrocarbon · Oxidation · Silicon · Surface energy · Topology · Bacterial spore · Chemistry · Classification · Drug effect · Halomonadaceae · Hydrophobicity · Microbiology · Pseudomonas fluorescens · Surface property · Ulva · Volatilization · Biofilms · Diatoms · Dimethylpolysiloxanes · Halomonadaceae · Hydrophobicity · Nanostructures · Pseudomonas fluorescens · Silicon Dioxide · Spores · Surface Properties · Volatilization · Water Microbiology · Chlorophyta

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 1.55-3.16 nm and RMS roughness 1.96-4.11 nm. 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.