Single‐step deposition of hexamethyldisiloxane surface gradient coatings with a high amplitude of water contact angles over a polyethylene foil

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.

A new strategy to prevent biofilm and clot formation in medical devices: The use of atmospheric non-thermal plasma assisted deposition of silver-based nanostructured coatings

“…from the tip of the electrode (as can be observed in the pictures reported in the next paragraph and in literature [21], leading to a deposition area of ~150 mm 2 .…”

“…Pristine substrates were placed 7 mm below the plasma source and exposed to the plasma discharge. Expanding from the APPJ orifice, the interaction of the plasma discharge and the treated substrate took place up to ~7 mm in the radial direction from the tip of the electrode (as can be observed in the pictures reported in the next paragraph and in literature [ 21 ], leading to a deposition area of ~150 mm 2 .…”