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Frybort, S; Obersriebnig, M; Muller, U; Gindl-Altmutter, W; Konnerth, J.
(2014): Variability in surface polarity of wood by means of AFM adhesion force mapping
COLLOID SURFACE A. 2014; 457: 82-87. FullText FullText_BOKU

Abstract:
The adhesion force between polar AFM tips and freshly cut wood surfaces was studied using AFM adhesion force mapping. Clear differences in polarity were found at microstructural level between freshly cut cell walls and native inner cell surfaces. Distinctly higher polarity in freshly cut cell walls is attributed to an abundance of accessible hydrophilic carbohydrate cell wall polymers compared to native cell surfaces. In good agreement with macroscopic studies of wood surface inactivation, the polarity of freshly cut cell walls showed a significant decrease with increasing surface age. Since such a decrease was observed to a much lesser degree in native inner surfaces compared to freshly cut cells it is proposed that predominantly the inactivation of freshly cut cell walls is responsible for overall surface inactivation phenomena in wood. It is concluded that the wood surface is heterogeneous in polarity, and that only the primarily hydrophilic wood surface regions are subject to inactivation, whereas surface chemistry of inner cell wall surfaces is very little affected by surface age. (C) 2014 Elsevier B.V. All rights reserved.
Authors BOKU Wien:
Frömel-Frybort Stephan
Gindl-Altmutter Wolfgang
Konnerth Johannes
Müller Ulrich
Obersriebnig Michael
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Find related publications in this database (Keywords)
AFM
Adhesion force
Surface inactivation
Wood


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