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Super-hydrophobic zinc oxide/silicone rubber nanocomposite surfaces
KTH-Royal Institute of Technology, Fibre and Polymer Technology, Stockholm, Sweden.
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. KTH-Royal Institute of Technology, Fibre and Polymer Technology, Stockholm / SLU-Swedish University of Agricultural Sciences, Uppsala, Sweden. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0002-0252-337X
ABB-Corporate Research, Power Technology, Västerås, Sweden.
KTH-Royal Institute of Technology, Fibre and Polymer Technology, Stockholm, Sweden. (Mechanical engineering)
2019 (English)In: Surfaces and Interfaces, ISSN 2468-0230, Vol. 14, p. 146-157Article in journal (Refereed) Published
Abstract [en]

This study presents comparative assessments on hydrophilic and hydrophobic ZnO nanoparticles and their deposition methods on the surface hydrophobicity of silicone rubber (PDMS) and glass substrates. The influence on the surface hydrophobicity and wettability of all the variables regarding the deposition methodologies and the interaction of the nanoparticles with the substrates were within the scope of this study. The different surfaces created by spraying, dipping and drop-pipetting deposition methods were assessed by static contact angle measurements and contact angle hysteresis from advancing and receding angles, as well as by the calculation of the sliding angle and the surface energy parameters. An accurate methodology to determine the contact angle hysteresis was proposed to obtain repetitive and comparative results on all surfaces. All the measurements have been correlated with the morphology and topography of the different surfaces analysed by FE-SE microscopy. The spray-deposition of hydrophobic ZnO nanoparticles on PDMS resulted in super-hydrophobic surfaces, exhibiting hierarchical structures with micro-and nanometer features which, together with the low surface energy, promotes the Cassie-Baxter wetting behavior. This study provides the fundamental approach to select critically the most promising combination in terms of materials and deposition techniques to create silicone-based super-hydrophobic surfaces with potential to be applied in high voltage outdoor insulation applications.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 14, p. 146-157
Keywords [en]
Super-hydrophobicity, Self-cleaning surface, PDMS, ZnO nanoparticles, Nanocomposite surfaces, High-voltage insulator
National Category
Energy Engineering Composite Science and Engineering
Research subject
Mechanics of Materials
Identifiers
URN: urn:nbn:se:his:diva-16700DOI: 10.1016/j.surfin.2018.12.008ISI: 000459836200019Scopus ID: 2-s2.0-85058703161OAI: oai:DiVA.org:his-16700DiVA, id: diva2:1296160
Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2019-03-18Bibliographically approved

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