Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.45: Poster
Montag, 27. März 2006, 18:00–21:00, P2
Investigation of pure and plasma treated wood and wood components with surface analytical techniques — •Lothar Klarhöfer1, Wolfgang Maus-Friedrichs1, Volker Kempter1, and Wolfgang Viöl2 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld — 2HAWK FH Hildesheim/Holzminden/Göttingen, Fakultät Naturwissenschaften und Technik, Von-Ossietzky-Straße 99, 37085 Göttingen
Surface properties of wood can be changed using a dielectric barrier discharge at atmospheric pressure. Depending on the utilised gas the surface tension and chemical activity can be increased or hydrophobic surfaces can be obtained by plasma-polymerisation. For characterising the altered wood surfaces different electron spectroscopic methods are used. XPS is a well known technique for analysing the chemical composition of wood surfaces. UPS and MIES are largely unknown methods on cellulosic materials. As UPS reflects the Density Of States (DOS), MIES the Surface Density of States (SDOS) respectively, these methods are useful to characterise changes of wood surfaces based on plasma treatment. It is shown that these techniques indeed yield reproducible results and, in particular, possess the potential to give information on the interaction of molecules with wood surfaces.
For this purpose, fingerprint MIES and UPS spectra of the wood components, lignin, cellulose and extractives are being collected in order to interpret the corresponding wood spectra. Thin films were prepared out of these components under clean conditions. The analysis of the spectra will be presented at the conference.