Superhydrophobic polymeric coatings produced by rapid expansion of supercritical solutions combined with electrostatic deposition (RESS-ED)

Summary, in English

In this paper we present a method to produce superhydrophobic polymeric coatings by combining the rapid expansion of supercritical solutions (RESS) with electrostatic deposition (ED). A copolymer, poly(vinyl acetate)-poly(vinyl pivalate) was dissolved in a mixture of supercritical carbon dioxide and acetone and sprayed through a nozzle with an applied voltage of 8 kV onto a surface placed on a earthed collector. Spray distance and polymer concentration were altered to find the most suitable spraying conditions. Superhydrophobic surfaces were produced when spraying both with and without a voltage, although the water repellent surfaces could be produced at a larger variety of processing parameters using the RESS-ED technique. The greatest improvement of using the RESS-ED process was that larger and thinner coatings were produced with a more even surface coverage of the created polymer particles compared to spraying without the applied voltage. (C) 2014 The Authors. Published by Elsevier B.V.

• Author: Louise Ovaskainen; Samuel Chigome; Natasha A. Birkin; Steven M. Howdle; Nelson Torto; Lars Wagberg; Charlotta Turner
• Department/s: Centre for Analysis and Synthesis
• Publishing year: 2014
• Language: English
• Pages: 610-617
• Publication/Series: Journal of Supercritical Fluids
• Volume: 95
• Links: http://dx.doi.org/10.1016/j.supflu.2014.09.014
• Document type: Journal article
• Publisher: Elsevier
• Topic: Chemical Sciences
• Keywords: Superhydrophobic coating; RESS; Electrostatic deposition; Poly(vinyl; acetate)-poly(vinyl pivalate); Supercritical solution
• Status: Published
• ISBN/ISSN/Other: ISSN: 0896-8446