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Gewählte Publikation:

Jaxel, J; Gusenbauer, C; Bohmdorfer, S; Liebner, F; Hansmann, C.
(2020): Improving single-step scCO(2) dyeing of wood by DMSO-induced micro-swelling
J SUPERCRIT FLUID. 2020; 165, 104978 FullText FullText_BOKU

Supercritical dyeing of wood is a smart green technology. Beyond being of interest to wood industry, it could help to preserve tropical forests and decrease the environmental pollution from overseas shipping. However, scCO(2) dyeing is still in its infancies. This paper demonstrates at the example of three major European hardwood species and the dye Naphthazarin that the uptake of colorants can be improved if scCO(2) is complemented with small amounts of DMSO. The latter triggers micro-swelling of wood, thereby improving dye penetration. Systematic variation of process parameters revealed that optimal colouration is reached at 20.0 MPa and 85 degrees C. Colour gradients as observed in the interior of halved specimen were evaluated by two methods. While the Euclidean distance Delta E (CIELAB) represents relative colour change only, a recently proposed scanning densitometric approach translates colour depth into absolute dye surface concentration. Morphological investigations conceal this study investigating the impact of selected process conditions. (C) 2020 The Authors. Published by Elsevier B.V.
Autor*innen der BOKU Wien:
Böhmdorfer Stefan
Gusenbauer Claudia
Hansmann Christian
Jaxel Julien
Liebner Falk

Find related publications in this database (Keywords)
Supercritical carbon dioxide dyeing
Wood modification
Dimethyl sulfoxide
Wood swelling

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