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Toward superhydrophobic polydimethylsiloxane−silica particle coatings
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber. KTH Royal Institute of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6394-6990
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
2016 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 37, no 9, p. 1375-1383Article in journal (Refereed) Published
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Abstract [en]

Hydrophobized silica nanoparticles of different sizes, from 16 to 500 nm, were used to impart roughness to a hydrophobic polydimethylsiloxane (PDMS) coating with the aim of obtaining superhydrophobic properties. The particle silanization process and the curing process of the PDMS coating were optimized to increase the contact angle (CA) of the particle containing coating. The evaluation of the coatings, by means of water CA measurements and scanning electron microscopy imaging, shows that superhydrophobicity in the adhesive rose state was achieved using combinations of two differently sized particles, with an excess of the small 16 nm ones. Superhydrophobicity in the lotus state was obtained when the filler concentration of 16 nm particles was 40 wt%, but under such conditions the coating was found to partially crack, which is detrimental in barrier applications. The preference for the rose wetting state can be explained by the round shape of the particles, which promotes the superhydrophobic rose wetting state over that of the superhydrophobic lotus state.

Place, publisher, year, edition, pages
Taylor & Francis, 2016. Vol. 37, no 9, p. 1375-1383
Keywords [en]
Lotus state, rose state, silica particles, superhydrophobic coating, wetting
National Category
Manufacturing, Surface and Joining Technology Materials Chemistry Other Chemistry Topics
Identifiers
URN: urn:nbn:se:ri:diva-123DOI: 10.1080/01932691.2015.1101610Scopus ID: 2-s2.0-84963606497OAI: oai:DiVA.org:ri-123DiVA, id: diva2:932898
Available from: 2016-06-02 Created: 2016-05-31 Last updated: 2020-12-01Bibliographically approved

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