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Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film

RSC advances, 2017-01, Vol.7 (46), p.29159-29169 [Peer Reviewed Journal]

ISSN: 2046-2069 ;EISSN: 2046-2069 ;DOI: 10.1039/c7ra03334f

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  • Title:
    Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film
  • Author: Cademartori, Pedro Henrique Gonzalez de ; Stafford, Luc ; Blanchet, Pierre ; Magalhães, Washington Luiz Esteves ; Muniz, Graciela Ines Bolzon de
  • Subjects: Atmospheric pressure ; Cedar ; Cold plasmas ; Contact angle ; Defluorination ; Dielectric barrier discharge ; Fluorination ; Functional groups ; Hydrophobic surfaces ; Hydrophobicity ; Organic chemistry ; Oxygen plasma ; Perfluorocarbons ; Photoelectrons ; Plasma ; Plasma deposition ; Pretreatment ; Roughness ; Thin films
  • Is Part Of: RSC advances, 2017-01, Vol.7 (46), p.29159-29169
  • Description: In this study, fluorocarbon thin films were deposited on the surface of white spruce and Brazilian cedar woods via atmospheric pressure dielectric barrier discharge in the afterglow mode with octafluoropropane gas. A pre-treatment with oxygen plasma was introduced before the thin film deposition to determine if this plasma condition could increase the wood nano/micro roughness, helping to improve the hydrophobicity of the surface. The optimal conditions of water repellency for both woods were examined in terms of their resistance to aging in controlled conditions. The water contact angle measurements showed a hydrophobic surface with a stable angle for both woods. X-ray photoelectron spectroscopy reveals the presence of CF, CF 2 and CF 3 functional groups after the Ar/C 3 F 8 plasma, especially for longer treatments. The open-air system of the plasma reactor leads to the simultaneous fluorination and incorporation of oxygen-containing groups. The pre-treatment of oxygen plasma increases the wood roughness; however, the chemical attachment of oxygen molecules is more significant, negatively affecting the degree of repellency of the plasma-coated woods. On the other hand, the fluorocarbon deposition increases the wood roughness and creates a hydrophobic surface simultaneously. Even with partial defluorination after aging, both plasma-coated woods retain a similar degree of water repellency, which partially avoid chemical reorganization of their surface due to environmental exposure. This study explores the fluorocarbon deposition on wood by atmospheric pressure plasma, with the focus on higher water repellency.
  • Publisher: Cambridge: Royal Society of Chemistry
  • Language: English
  • Identifier: ISSN: 2046-2069
    EISSN: 2046-2069
    DOI: 10.1039/c7ra03334f
  • Source: DOAJ Directory of Open Access Journals
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