title: Study of plasma modified-PTFE for biological applications: relationship between protein resistant properties, plasma treatment, surface composition and surface roughness.
abstract: PTFE samples were treated by low-pressure, O2RF plasmas. The adsorption of BSA was used as a probe for the protein resistant properties. The exposure of PTFE to an O2plasma leads to an increase in the chamber pressure. OES reveals the presence of CO, CO2and F in the gas phase, indicating a strong etching of the PTFE surface by the O2plasma. Furthermore, the high resolution C1s spectrum shows the appearance of CF3, CF and C-CF components in addition to the CF2component, which is consistent with etching of the PTFE surface. WCA as high as 160° were observed, indicating a superhydrophobic behaviour. AFM Images of surfaces treated at high plasma power showed a increase in roughness. Lower amounts of BSA adsorption were detected on high power, O2plasma-modified PTFE samples compared to low power, oxygen plasma-modified ones.
authors.affiliation: Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Vandencasteele
authors.affiliation: Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium.
authors.forename: Bernard
authors.initials: B
authors.lastname: Nisol
authors.affiliation: Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium.
authors.forename: Pascal
authors.initials: P
authors.lastname: Viville
authors.affiliation: Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium.
authors.forename: Roberto
authors.initials: R
authors.lastname: Lazzaroni
authors.affiliation: National ESCA and Surface Analysis Center for Biomedical Problems, Departments of Chemical Engineering and Bioengineering, University of Washington, Box 351750, Seattle, Washington 98195, USA.
authors.forename: David G
authors.initials: DG
authors.lastname: Castner
authors.affiliation: Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium.
authors.forename: François
authors.initials: F
authors.lastname: Reniers
keywords: biocompatibility; plasma treatment; polymer modification; polytetrafluoroethylene (PTFE); protein adsorption