Non-equilibrium hybrid organic plasma processing for superhydrophobic PTFE surface towards potential bio-interface applications

[Display omitted] •An efficient modification of PTFE by organic plasma process (OPP) is reported here.•MMA-O2 plasma offers modification into superhydrophobic Cassie-Baxter state surface.•OPP enables us to tune the selective functionalization and surface roughness.•OPP activated biomaterials could b...

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Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2019-11, Vol.183, p.110463-110463, Article 110463
Main Authors: Vijayan, Vineeth M., Tucker, Bernabe S., Baker, Paul A., Vohra, Yogesh K., Thomas, Vinoy
Format: Article
Language:English
Subjects:
Hydrophobic and Hydrophilic Interactions
Methylmethacrylate - chemistry
Microscopy, Electron, Scanning
Organic plasma processing
Plasma modification
Polymerization
Polymers - chemistry
Polymethyl Methacrylate - chemistry
Polytetrafluoroethylene - chemistry
PTFE
Spectroscopy, Fourier Transform Infrared
Superhydrophobic
Surface Properties
X-Ray Diffraction
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Summary:[Display omitted] •An efficient modification of PTFE by organic plasma process (OPP) is reported here.•MMA-O2 plasma offers modification into superhydrophobic Cassie-Baxter state surface.•OPP enables us to tune the selective functionalization and surface roughness.•OPP activated biomaterials could be used as potential blood-contacting surfaces. Superhydrophobic surfaces have gained increased attention due to the high water-repellency and self-cleaning capabilities of these surfaces. In the present study, we explored a novel hybrid method of fabricating superhydrophobic poly(tetrafluoroethylene) (PTFE) surfaces by combining the physical etching capability of oxygen plasma with the plasma-induced polymerization of a organic monomer methyl methacrylate (MMA). This novel hybrid combination of oxygen-MMA plasma has resulted in the generation of superhydrophobic PTFE surfaces with contact angle of 154°. We hypothesized that the generation of superhydrophobicity may be attributed to the generation of fluorinated poly(methyl methacrylate) (PMMA) moieties formed by the combined effects of physical etching causing de-fluorination of PTFE and the subsequent plasma polymerization of MMA. The plasma treated PTFE surfaces were then systematically characterized via XPS, FTIR, XRD, DSC and SEM analyses. The results have clearly shown a synergistic effect of the oxygen/MMA combination in comparison with either the oxygen plasma alone or MMA vapors alone. Furthermore, the reported new hybrid combination of Oxygen-MMA plasma has been demonstrated to achieve superhydrophobicity at lower power and short time scales than previously reported methods in the literature. Hence the reported novel hybrid strategy of fabricating superhydrophobic PTFE surfaces could have futuristic potential towards biointerface applications.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2019.110463