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Surface free energy of natural and surface-modified tropical and European wood species
Institute of Chemistry, Chemical Research Center, Hungarian Academy of Sciences, Budapest.
Department of Physical Chemistry, Budapest University of Technology and Economics, Budapest.
Department of Physical Chemistry, Budapest University of Technology and Economics, Budapest.
Department of Physical Chemistry, Budapest University of Technology and Economics, Budapest.
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2004 (English)In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 18, no 6, p. 687-713Article in journal (Refereed) Published
Abstract [en]

To describe the wetting properties of various wood types from a practical point of view, the surface free energy of six tropical (guava, almond, teak, cloves, mango and neem) and six European wood species (English oak, Norway maple, hazel, ash, alder and Scots pine) were calculated using contact angles by the sessile-drop method. In order to provide water-repellent characteristics to the samples, they were silanized by a less used silylating reagent (using chloroform solution of trimethylsilyl N,N-dimethylcarbamate) and the results were compared with the effect of two commonly used reagents (chloroform solutions of chlorotrimethylsilane and octadecyltrichlorosilane). Since the Lifshitz-van der Waals/acid-base model is widely used in studies of biological surfaces, the energetics of the resultant wood surfaces were quantitatively described in terms of this model. For the mainly hydrophobic wood samples, anomalous surface behaviour (i.e. extremely high water contact angles (130-145°) and in certain cases unreasonably low surface free energy values) was found. Since the Lifshitz-van der Waals/acid-base model did not yield numerical results in some cases and the calculated surface free energies depended on the test liquid triplet used, the limitations in the applicability of this model are also discussed. For comparison, we analyzed our data also in terms of the Chang model.

Place, publisher, year, edition, pages
2004. Vol. 18, no 6, p. 687-713
National Category
Physical Chemistry Physical Chemistry
Research subject
Physical Chemistry; Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-6017DOI: 10.1163/156856104839338Local ID: 4363a7f0-db76-11db-b67f-000ea68e967bOAI: oai:DiVA.org:ltu-6017DiVA: diva2:978893
Note
Validerad; 2004; 20070326 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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