Oxygen/water vapor-plasma treated polished aluminum substrates were coated with poly(acrylic acid)(PAA)using deeping-coating technique,and subsequently heated.ESCA,chemical derivatization and SEM confirmed the successful coating of substrates.It was shown that the covalently attached PAA macromolecules exhibit anti-bacterial characteristics.Samples coated with PAA exposed to a 5 strain mixture of Listeria monocytogenes for 24 hours resulted in 98% decrease in the bacterial population.A mix of three different bacteria,Pseudomonas aeruginosa,Staphylococcus epidermidis,and Escherichia coli was also tested.A reduction of 82 to 96% of bacterial numbers was obtained.Experimental results indicated that double layer structures could also be prepared from PAA-coated surfaces.PAA and polyvinyl-pyridine)(PVP)double layers were successfully generated.
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