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Application of a Fickian model of diffusion to the dehydration of graded specimens of a precious Australian sedimentary opal derived from Coober Pedy |
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| Authors: | A. Smallwood P. S. Thomas A. S. Ray P. ?imon |
| Affiliation: | (1) Department of Chemistry, Materials and Forensic Sciences, University of Technology Sydney, P.O. Box 123, Broadway, Sydney, NSW, 20007, Australia;(2) Institute Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinsk?ho 9, 812 37 Bratislava, Slovak Republic; |
| Abstract: | A model developed for the estimation of the diffusion coefficient based on Fickian diffusion is applied to the dehydration of a Coober Pedy white play of colour (precious) opal using thermogravimetric analysis (TG). The model was originally applied to bulk and powdered opal (opal with no bulk). In this paper the opal was graded prior to TG analysis. The diffusion coefficient was calculated and is reported up to the critical point of water. |
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