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Effect of titanium surface topography on plasma deposition of antibacterial polymer coatings
- Source :
- Applied Surface Science. 521:146375
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Plasma processing, e.g., functionalisation and deposition of antibacterial coatings, is often used to enhance surface properties of biomaterials. Plasma is, however, a non-uniform active medium, and the result of processing depends on the nature of both the plasma and the substratum. Here we show that when an antibacterial coating (i.e., polyterpenol) is plasma polymerised onto four types of titanium substrata that differ in their micro- and nano-scale topography (but not the bulk chemistry), the distribution of functional groups, e.g., OH and C O, in the polymer across the surface differs sufficiently, and so does the antibacterial activity of the resulting material system. While the addition of a coating hinders biofilm formation by Staphylococcus aureus and Pseudomonas aeruginosa, the bactericidal effect is significantly stronger in polymers deposited onto surfaces possessing lower degrees of nanoscale roughness, e.g., substrata after mechanical and chemical polishing. The reduced antibacterial efficacy of polymers on substrata with greater surface roughness (e.g., on mechanically polished or lotus leaf-like surfaces) is attributed to a greater extent of thickness non-uniformity and heterogeneity in the functional group distribution across the surface. These findings suggest that the magnitude and distribution of topographical features of the substratum should be considered when designing plasma-enabled surface modification strategies.
- Subjects :
- Materials science
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
Surface finish
engineering.material
010402 general chemistry
01 natural sciences
Coating
Surface roughness
Plasma processing
chemistry.chemical_classification
Surfaces and Interfaces
General Chemistry
Polymer
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Surfaces, Coatings and Films
chemistry
Chemical engineering
engineering
Surface modification
0210 nano-technology
Antibacterial activity
Titanium
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 521
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........9900984aa8a6e2d86e0c240159ed7a4b