Modification of cellulose nanofibre surfaces by He/NH3 plasma at atmospheric pressure
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Cellulose nanofibre coatings were treated by a dielectric barrier discharge plasma in a He/NH3 gas mixture at atmospheric pressure. Ultrasound was optionally irradiated during the treatment. The treatment enhanced the wetting of deionized water, glycerol, and uncured epoxy. Irradiation of ultrasound did not significantly change optical emission from the plasma, but increased the oxygen contents and enhanced etching and roughening at the nanofibre coating surfaces. Furthermore, the irradiation of ultrasound enhanced the wetting of deionized water and glycerol drastically, while that of uncured epoxy to some extent.
KeywordsCellulose Nanofibre Plasma treatment Dielectric barrier discharge Ultrasound Wetting Surface roughening
This study has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. FoF NMP2013-10-608746 (INCOM). Yvonne Aitomaki is acknowledged for scientific discussion. Technical supports on acoustics were provided from Niels Krebs (FORCE Technology, Denmark) and Alexander Bardenshtein (Danish Technological Institute, Denmark).
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