Permanent hydrophilization of outer and inner surfaces of polytetrafluoroethylene tubes using ambient air plasma generated by surface dielectric barrier discharges

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Authors

PAVLIŇÁK David GALMIZ Oleksandr ZEMÁNEK Miroslav BRABLEC Antonín ČECH Jan ČERNÁK Mirko

Year of publication 2014
Type Article in Periodical
Magazine / Source Applied Physics Letters
MU Faculty or unit

Faculty of Science

Citation
Web http://dx.doi.org/10.1063/1.4898134
Doi http://dx.doi.org/10.1063/1.4898134
Field Plasma physics
Keywords plasma; PTFE;dielectric barrier discharge;hydrophilization
Description We present an atmospheric pressure ambient air plasma technique developed for technically simple treatment of inner and/or outer surfaces of plastic tubes and other hollow dielectric bodies. It is based on surface dielectric barrier discharge generating visually diffuse plasma layers along the treated dielectric surfaces using water-solution electrodes. The observed visual uniformity and measured plasma rotational and vibrational temperatures of 333K and 2350K indicate that the discharge can be readily applied to material surface treatment without significant thermal effect. This is exemplified by the obtained permanent surface hydrophilization of polytetrafluoroethylene tubes related to the replacement of a high fraction (more than 80%) of the surface fluorine determined by X-ray photoelectron spectroscopy. A tentative explanation of the discharge mechanism based on high-speed camera observations and the discharge current and voltage of measurements is outlined.
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