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Gewählte Doctoral Thesis:

Doctoral Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 138. UB BOKU obvsg

Data Source: ZID Abstracts
Efficient protection against the absorption of liquid water can prevent numerous problems with wood. This work deals with the use of waxes and vegetable oils as coating materials for solid wood - two environmentally-friendly groups of materials whose potential as wood preservatives has so far been perceived as very limited. Fundamental influences of individual oil components on the interactions of oiled wood with liquid water were investigated and a new factor was presented that provides insights into the influences of wood on oil drying. Thus, a plant oil-based wood finish was formulated that combines short drying times with significantly improved protection against water stains. Natural models such as the lotus leaf show how waxes with sophisticated structures can create extremely water-repellent surfaces. An application-oriented and environmentally-friendly process for spraying aqueous wax dispersions onto solid wood was developed. Distinctive wax structures resulted in superhydrophobic wood surfaces with water contact angles of up to 170°. With certain waxes, a simple thermal treatment allowed the efficient recovery of superhydrophobicity after the surface has been mechanically damaged. The process is extremely efficient, reliable and cost-effective and, when carnauba or beeswax is used, can produce completely bio-based, water-repellent wood surfaces. The approaches were combined to produce superhydrophobic vegetable oil-based wood surfaces for the first time. The unprecedented simplicity of producing superhydrophobic wood surfaces and the excellent water stain resistance of the oil formulation have great market potential and may be able to support further research and thus the use of environmentally-friendly materials for the hydrophobization of solid wood materials.

Betreuer: Gindl-Altmutter Wolfgang
1. Berater: Hansmann Christian
2. Berater: Konnerth Johannes

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