Reduction and oxidation of cellulose surfaces by means of cold plasma

Abstract

Hydrogen and oxygen plasma treatment of two cellulose materials, a filter paper of pure cellulose and a greaseproof paper with a fairly high surface content of wood resin, has been studied with ESCA as well as by contact angle or water absorption. The hydrogen plasma treatment reduces the hydroxyl groups on the cellulose and creates low molecular weight materials. Due to the lower polarity, water absorption is reduced. The oxygen plasma treatment of the pure cellulose both oxidizes and reduces the surface. The resin-rich paper, which has a hydrophobic nature, shows improved water wettability after both hydrogen and oxygen plasma treatments.

Clean and reactive nanostructured cellulose surface

“…This is in contrast to e.g. oxygen plasma treatment of cellulose fibres, 232 where quite short treatment times induces clear degradation, observed as increase in C−C carbon and 233 oxidation, observed as an increase in O−C=O carbon (Carlsson and Ström 1991). 234…”

Hydrophilic Fluorocarbon Coatings via Plasma Enhanced-Chemical Vapour Co-Deposition of Acrylic Acid and Hexafluoropropylene Oxide

“…[2][3][4][5][6][7][8][9], are unsuitable for such applications for their hydrophobic nature and absence of ionic conductivity. For this reason, processes able to produce hydrophilic and ion conductive fluoropolymers would be desirable.…”

Sol-gel/Ag coating and oxygen plasma treatment effect on synthetic wound fluid sorption by non-woven cellulose material

“…Silver is known as an excellent antimicrobial agent [2][3][4][5], applied in many wound dressing products [2]. Plasma treatment is one of the most versatile techniques in polymer surface modifi cations [6] used for increasing wettability [7] and adhesion [8], while the best results are observed when using oxygen gas [9]. In our previous studies [10], we combined safe silver binding on cellulose substrate and oxygen plasma modifi cation aiming at achieving simultaneously antimicrobial properties along with improved hydrophilicity.…”