Determination of the surface fractal dimension from sorption isotherms of five softwoods |
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| Authors: | K Fan S G Hatzikiriakos S Avramidis |
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| Institution: | (1) University of British Columbia, Department of Wood Science 4028-2424 Main Mall, Vancouver B.C., V6T1Z4 Canada, CA;(2) University of British Columbia, Department of Chemical Engineering 309-2216 Main Mall, Vancouver B.V., V6 T 1Z4 Canada, CA |
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| Abstract: | Summary This paper presents the determination of the surface fractal dimensions from water adsorption/desorption data of five softwood
species by using three different methods. The Frenkel-Holsi-Hill model of polymolecular sorption on a fractal surface by allowing
capillary condensation is shown to be the best method. Using this method, the fractal dimensions were found to be close to
2.5 and 2.4 from desorption and adsorption isotherms respectively. Moreover, they were shown to slightly vary between species,
and between sapwood and heartwood for the temperature range of 30 to 60 °C, but with no clearly identifiable temperature effect.
Received 13 March 1997 |
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