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Title Wettability study and surface characterizacion by confocal laser scanning microscopy of rotary-peeled wood veneers
Author Gonzalo Vazquez, Cristina Galinanes, M. Sonia Freire, G. Antorrena, Julia Gonzalez-Alvarez
Abstract The aim of this work was to study the surface properties of rotary-peeled veneers of five species of hardwoods: okume, ayous, poplar, fromager and eucalyptus and to compare the behavior of both sides of the veneers. The equilibrium contact angles were determined together with the wood surface free energy and its polar and disperse components. Additionally, surface roughness was evaluated using confocal laser scanning microscopy. Surface free energy ranged from 49-64 mJ/m2 and decreased in the order okume> fromager> poplar> eucalyptus ~ ayous, indicating a decrease in wettability in that order. Okume wood with the highest value of the surface free energy and the lowest values of the equilibrium contact angle was confirmed as the species with the best wetting properties, and also presented the highest values of surface roughness parameters. In general, there were not significant differences between the properties of both sides of the veneers, except for roughness. The largest differences were obtained for okume veneers whose interior side showed higher wettability.
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Keywords Rotary-peeled veneers; wettability; contact angle; surface free energy; confocal laser scanning microscopy; roughness
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