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Analysis of transport phenomena during plasma deposition of hydrophobic coatings on porous cellulosic substrates in plane‐to‐plane dielectric barrier discharges at atmospheric pressure
Author(s) -
Babaei Sara,
Profili Jacopo,
Asadollahi Siavash,
Sarkassian Andranik,
Dorris Annie,
Beck Stephanie,
Stafford Luc
Publication year - 2020
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.202000091
Subject(s) - hexamethyldisiloxane , materials science , dielectric barrier discharge , atmospheric pressure , contact angle , atmospheric pressure plasma , coating , analytical chemistry (journal) , chemical engineering , outgassing , porous medium , composite material , dielectric , porosity , plasma , chemistry , chromatography , organic chemistry , physics , optoelectronics , quantum mechanics , engineering , oceanography , geology
In this study, four‐layer stacks of bleached, unrefined Kraft papers are exposed to a plane‐to‐plane dielectric barrier discharge at atmospheric pressure operated in a glow‐like discharge regime and sustained in a mixture of hexamethyldisiloxane and helium gases. Scanning electron microscopy confirms that the plasma‐deposited coating follows the roughness of the porous cellulosic substrate. Whereas fairly spatially homogeneous coatings are obtained on silicon, significant variations of the coatings' thickness, organic content, and water contact angle are observed along the gas flow lines on the Kraft paper. These effects are even more important in the presence of substrate outgassing. In addition, plasma‐generated species sequentially penetrate down to the fourth layer of the cellulosic substrate, rendering surfaces hydrophobic with very low water absorption kinetics.