engleski

The sorption properties of some thermal treated hardwoods analysed by thermodynamics, surface fractality and FT-NIR spectroscopy

The sorption- and chemical properties of ash- and beech wood after industrial heat treatment in water-vapour atmosphere were analysed by sorption thermodynamics, adsorbing surface fractality from sorption isotherms and by FT-NIR spectroscopy. Considerable reduction of water vapour sorption capacity after heat treatment of wood was confirmed at both wood species, more significant at beech wood in the middle hygroscopic range. Fractal dimension of internal adsorbing wood surfaces increased with amount of sorbed water and also after thermal processing. FT-NIR spectroscopy revealed most significant differences in chemical properties of hemicelluloses and revealed regions and bands, where considerable changes are appearing due to changed water sorption of innate- and heat-treated ash- and beech wood.

hardwood; thermal modification; sorption; FT-NIR spectroscopy; fractal dimension.

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