Surface and protein adsorption properties of 316L stainless steel modified by polyvinyl alcohol and plasma-treated polyvinyl alcohol films

摘要

In this study, we investigated the surface and protein adsorption properties of 316L stainless steels coated with polyvinyl alcohol (PVA) and N-2-plasma-modified PVA films. The water contact angle of the 316L stainless steel significantly decreased after the coating with the PVA film owing to the abundant hydrophilic functional groups formed on the surface of the PVA film. The signal of the hydrophilic functional groups of the PVA film became more significant after the N-2 plasma modification, leading to a further decrease in the water contact angle of the PVA film. Electrochemical tests showed that the corrosion resistance of the 316L stainless steel improved by the coating of the PVA and N-2-plasma-modified PVA films. Bicinchoninic-acid protein assay results showed that the 316L stainless steels coated with the PVA and N-2-plasma-modified PVA films exhibited lower bovine serum albumin concentrations than that of the neat 316L stainless steel, indicating that the anticoagulant properties of the 316L stainless steel surface could be improved after the coating with the PVA and plasma-modified PVA films.