Surface Characterization Of Eucalyptus And Ash
Wood Veneers By XPS, TOF-SIMS, Optic
Profilometry And Contact Angle Measurements
Author(s)
G. Vázquez, R. Ríos, M. S. Freire, G. Antorrena
& J. González-Álvarez
Abstract
Composition and properties of the wood surface are very important in board
manufacture as they determine wood-adhesive bonding and the quality of the
final product. In this work two spectroscopic techniques, X-ray photoelectron
spectrometry (XPS) and time of flight secondary ion mass spectrometry (TOF –
SIMS), have been employed to study the surface composition of eucalyptus
(Eucalyptus globulus) and ash (Fraxinus excelsior) sliced cut veneers. Both
wood species are widely used for decorative veneers in the finishing of wood
panels (particle boards, medium density fiber–boards, etc.). Further
characterization of the wood surface was carried out by optic profilometry and
wettability analysis, using the sessile drop method to measure contact angles.
Wood is a very heterogeneous material and its composition can vary
significantly depending on the sampling area; then, the influence of the radial
position of the veneer in the trunk was also analyzed. From the low resolution
XPS spectra the oxygen to carbon (O/C) ratio was calculated and, resolving the
C1s signal, the percentages of the different carbon peaks corresponding to
different functional groups (C1, C2, C3 and C4 carbons) were also calculated.
The lower O/C ratio and the higher C1/C2 ratio for eucalyptus than for ash was
attributed to the higher concentration of extractives on the eucalyptus wood
surface that was confirmed by the TOF-SIMS spectra, which additionally
revealed a patchy distribution of the extractives. The higher hydrophobicity of
the eucalyptus wood surfaces was also supported by the results on the wetting
properties of the veneers. Eucalyptus veneers exhibited a significantly higher
constant wetting rate angle (cwra) and, consequently, a lower wettability than
Keywords
wood veneers, wettability, contact angles, XPS, TOF-SIMS, optic profilometry
Related Book
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