Back to Search
Start Over
Surface chemical composition and roughness as factors affecting the wettability of thermo-mechanically modified oak (Quercus robur L.)
- Source :
- Holzforschung. 72:993-1000
- Publication Year :
- 2018
- Publisher :
- Walter de Gruyter GmbH, 2018.
-
Abstract
- European oak wood (W) was thermo-mechanically modified (TM) via densifying at 100 and 150°C and the surface properties of the TMW were investigated. The contact angle (CA) of the wood with the reference liquids water and diiodomethane was determined using the sessile drop method. The surface free energy of the TMW on tangential sections within the first 60 s after applying a drop was analyzed. The roughness parameters Ra and Rz parallel (‖) and perpendicular (⊥) to the grain were investigated. The wettability analysis showed that densified wood had a higher CA and lower work of adhesion and surface free energy than non-densified wood. An X-ray photoelectron spectroscopy [XPS or electron spectroscopy for chemical analysis (ESCA)] analysis showed that the oxygen to carbon atoms ratio (O/C ratio) of densified wood surface was lower than that of non-densified wood. The carbon C1-C2 atoms ratio (C1/C2 ratio) increased with increasing TM temperature. The results were interpreted as being that extractives migrate to the surface and amorphous and glassy polymers, i.e. lignin and hemicelluloses, in wood are rearranged. Increasing densification temperature makes TMW surfaces more hydrophobic.
- Subjects :
- 040101 forestry
0106 biological sciences
Materials science
04 agricultural and veterinary sciences
Surface finish
01 natural sciences
Quercus robur L
Biomaterials
Contact angle
Chemical engineering
010608 biotechnology
0401 agriculture, forestry, and fisheries
Surface chemical
Composition (visual arts)
Wetting
Chemical composition
Subjects
Details
- ISSN :
- 1437434X and 00183830
- Volume :
- 72
- Database :
- OpenAIRE
- Journal :
- Holzforschung
- Accession number :
- edsair.doi...........def7c7bf2d53b216edeb28a619afc725