Hydrophobisation of wood surfaces by combining liquid flame spray (LFS)and plasma treatment: dynamic wetting properties
2015 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed) In press
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 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 method, resulting in advancing and receding contact angles as well as sorption behaviour of the samples during repeated wetting cycles in water. Atomic force microscopy (AFM) and Xray 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 behaviour. 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
De Gruyter , 2015.
contact angle (CA); dynamic wetting, hydrophobisation; hexamethyldisiloxane (HMDSO); liquid flame spray (LFS); multi-scale roughness; nano-sized metal oxide (TiO2); perfluorohexane (PFH); plasma polymerisation; superhydrophobicity; Wilhelmy plate method; wood.
Research subject Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-175873DOI: 10.1515/hf-2015-0148OAI: oai:DiVA.org:kth-175873DiVA: diva2:862792
QP 2015122015-10-232015-10-232016-05-04Bibliographically approved