Characterization of Biofilms Formed on Gold in Natural Seawater by Oxygen Diffusion Analysis

INTRODUCTIONBiofilms usually are composed of microbial cells and their products (e.g., extracellular polymers). Their structure generally is very porous in regard to the amount of water (> 95%).1 Biofilms can be characterized, among other things, by their geometry (e.g., porosity [] and thickness...

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Published inCorrosion (Houston, Tex.) Vol. 53; no. 1; pp. 4 - 10
Main Authors LHostis, E., Compère, C., Festy, D., Tribollet, B., Deslouis, C.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Houston, TX NACE International 01.01.1997
NACE
National Association of Corrosion Engineers
Subjects
Applied sciences
Biofilms
Chemical analysis
Chemical Sciences
Corrosion
Corrosion environments
Diffusion
Diffusion coating
Diffusion coefficient
Diffusion layers
Diffusion rate
Electrohydrodynamics
Environmental Sciences
Exact sciences and technology
Feasibility studies
Gelatin
Gold
Metals. Metallurgy
Modelling
Oxygen
Porosity
Rotating disks
Rotation
Seawater
Steady state
Submerging
Thickness
Transfer functions
Water analysis
Biofilm
Porosity
Diffusion coefficient
Bacterial corrosion
Impedance
Layer thickness
Modeling
Sea water corrosion
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Summary:INTRODUCTIONBiofilms usually are composed of microbial cells and their products (e.g., extracellular polymers). Their structure generally is very porous in regard to the amount of water (> 95%).1 Biofilms can be characterized, among other things, by their geometry (e.g., porosity [] and thickness [ f]) by studying mass transport. A good method of determining mass transport properties in such a medium is to analyze the flux of a redox solute giving a fast electrochemical reaction at a coated metal with such a film. The oxygen reduction reaction is an adequate candidate for this purpose2 and provides a limiting current with a rotating disk electrode (RDE).3 It also has the advantage of being naturally present in fresh water and seawater where biofilms grow. In the present work, two techniques -- a steady flow technique and an electrohydrodynamic impedance (EHD) technique -- were used to test this procedure using a model porous layer and then to apply it to a biofilm.THEORETICAL ANALYSIS: DIFFUSION TRANSPORT THROUGH A POROUS LAYERThe oxygen concentration gradient is distributed between a porous layer, where mass transport is controlled by a molecular diffusion process, and the electrolyte solution, where mass transport is controlled by convective diffusion (Figure 1).4
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ISSN:0010-9312
1938-159X
DOI:10.5006/1.3280433