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Hydrophobisation of wood surfaces by combining liquid flame spray (LFS) and plasma treatment: Dynamic wetting properties
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
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.
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2016 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 70, no 6, p. 527-537Article in journal (Refereed) Published
Abstract [en]

The hydrophilic nature of wood surfaces is a major cause for water uptake and subsequent biological degradation and dimensional changes. In the present paper, a thin transparent superhydrophobic layer on pine veneer surfaces has been created for controlling surface wettability and water repellency. This effect was achieved by means of the liquid flame spray (LFS) technique, in the course of which the nanoparticulate titanium dioxide (TiO2) was brought to the surface, followed by plasma polymerisation. Plasma polymerised perfluorohexane (PFH) or hexamethyldisiloxane (HMDSO) were then deposited onto the LFS-treated wood surfaces. The same treatment systems were applied to silicon wafers so as to have well-defined reference surfaces. The dynamic wettability was studied by the multicycle Wilhelmy plate (mWP) method, resulting in advancing and receding contact angles as well as sorption behavior of the samples during repeated wetting cycles in water. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were employed to characterise the topography and surface chemical compositions and to elucidate the question how the morphology of the nanoparticles and plasma affect the wetting behavior. A multi-scale roughness (micro-nano roughness) was found and this enhanced the forced wetting durability via a superhydrophobic effect on the surface, which was stable even after repeated wetting cycles. The hydrophobic effect of this approach was higher compared to that of plasma modified surfaces with their micro-scale modification.

Place, publisher, year, edition, pages
Walter de Gruyter, 2016. Vol. 70, no 6, p. 527-537
Keywords [en]
cold plasma, contact angle (CA), dynamic wetting, hexamethyldisiloxane (HMDSO), hydrophobisation, liquid flame spray (LFS), multi-scale roughness, nano-sized metal oxide (TiO2), perfluorohexane (PFH), plasma polymerisation, superhydrophobicity, Wilhelmy plate method, wood
National Category
Paper, Pulp and Fiber Technology Materials Chemistry Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-898DOI: 10.1515/hf-2015-0148Scopus ID: 2-s2.0-84973442118OAI: oai:DiVA.org:ri-898DiVA, id: diva2:957057
Available from: 2016-08-31 Created: 2016-08-31 Last updated: 2019-06-14Bibliographically approved

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Swerin, Agne

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