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Multicycle wilhelmy plate method for wetting properties, swelling and liquid sorption of wood
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.ORCID iD: 0000-0002-2614-1245
KTH Royal Institute of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6394-6990
2013 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 29, no 39, p. 12145-12153Article in journal (Refereed) Published
Abstract [en]

A multicycle Wilhelmy plate method has been developed to investigate wetting properties, liquid sorption, and swelling of porous substrates such as wood. The use of the method is exemplified by studies of wood veneers of Scots pine sapwood and heartwood, which were subjected to repeated immersion and withdrawal in a swelling liquid (water) and in a nonswelling liquid (octane). The swelling liquid changes the sample dimensions during measurements, in particular its perimeter. This, in turn, influences the force registered. A model based on a linear combination of the measured force and final change in sample perimeter is suggested, and validated to elucidate the dynamic perimeter change of wood veneer samples. We show that pine heartwood and pine sapwood differ in several respects in their interaction with water. Pine heartwood showed (i) lower liquid uptake, (ii) lower swelling, (iii) higher contact angle, and (iv) lower level of dissolution of surface active components (extractives) than pine sapwood. We conclude that the method is also suitable for studying wetting properties of other porous and swellable materials. The wettability results were supported by surface chemical analysis using X-ray photoelectron spectroscopy, showing higher extractives and lignin content on heartwood than on sapwood surfaces.

Place, publisher, year, edition, pages
2013. Vol. 29, no 39, p. 12145-12153
Keywords [en]
Forestry, Photoelectrons, Swelling, Veneers, Wetting, Wood products, X ray photoelectron spectroscopy
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6543DOI: 10.1021/la402605qScopus ID: 2-s2.0-84884998170Local ID: 23824OAI: oai:DiVA.org:ri-6543DiVA, id: diva2:964381
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-04-04Bibliographically approved

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Sedighi Moghaddam, MaziarSwerin, Agne

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