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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:23 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Surface modification of polymeric foils by a dielectric barrier plasma source discharge at atmospheric pressure
Authors:
M.D. Ionita, M. Teodorescu, E. R. Ionita, C. E. Stancu, A. Moldovan,
G. Dinescu
Affiliation:
1National Institute for Lasers, Plasma and Radiation Physics, Magurele - Bucharest, Romania
E-mail
daniela.ionita@infim.ro
Keywords:
atmospheric pressure plasma, surface plasma processing, contact angle, adhesion, hydrophilicity, roughness
Abstract:
Atmospheric pressure plasma treatments are of the great interest for polymer surface processing because of their convenience, efficiency and, low cost (not vacuum involved). Plasma treatment are use to modify surface properties of materials such as adhesion, hydrophobicity, hydrophilicity, and many others. In the present work polyethylene terephthalate (PET), polyethylene (PE), and polytetrafluorethylene (PTFE, Teflon) surfaces were modified using Dielectric Barrier Discharge (DBD) plasma sources in planar configuration. The treatment of polymeric foils is achieved by using a scanning procedure: the plasma produced in the gap of a discharge limited by dielectric barriers expands outside and is directed on the surface. The treated surfaces have been analyzed using atomic force microscopy and contact angle measurement. The change of contact angle was monitored as a function of treatment time. After the plasma treatment the wetability of surface increases considerably, as described by the much lower contact angles of the treated surfaces. Also, it was observed a recovering of the contact angle close to the initial values after long time exposure in the environment. AFM technique showed a significant increase of the surface roughness depending on the exposure plasma time.
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