Single‐step deposition of hexamethyldisiloxane surface gradient coatings with a high amplitude of water contact angles over a polyethylene foil. Issue 2 (30th August 2020)

• Record Type: Journal Article
• Authors: Malekzad, Hediyeh; Gallingani, Tommaso; Barletta, Federica; Gherardi, Matteo; Colombo, Vittorio; Duday, David
• Is Part Of: Plasma processes and polymers. Volume 18:Issue 2(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-30
• Subjects: chemistry gradient -- hexamethyldisiloxane -- plasma jet -- plasma‐enhanced chemical vapor deposition -- water contact angle; Plasma polymerization -- Periodicals; Plasma-enhanced chemical vapor deposition -- Periodicals; Plasma chemistry -- Periodicals
• DOI: 10.1002/ppap.202000044
• Languages: English
• ISSNs: 1612-8850

Abstract

Abstract: One interesting category of nano‐ and micro‐engineered surfaces is surface gradients, which allow the controlled optimization of biointerfaces at a small scale in an extended area length. Plasma coatings offer a large diversity of functionalities at the nanoscale, accompanied by high chemical stability and adhesion on a variety of substrates at ambient temperature. Atmospheric‐pressure plasma‐assisted deposition could be employed for the generation of surface gradients on thermosensitive materials. In this study, a corona plasma jet is used to deposit polydimethylsiloxane/SiO2 ‐like surface gradients on polyethylene foil by varying the O2 concentration in the discharge during the movement of the plasma source. We obtained, in a single‐step approach, gradient coatings along a length of ∼10 cm, with a gradual variation of both chemistry and surface energy. Abstract : The polymerization of HMDSO in the presence of oxygen gas with gradually increasing flow rates, generates spatial gradient of oxygen‐containing functional groups along the surface. The programed plasma jet moves along the polyethylene foil with a fixed rate depositing each seven coatings consecutively. The generated chemistry gradient leads to the gradual variation of the surface wettability.