Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 97: Issue 2
Application of a Fickian model of diffusion to the dehydration of graded specimens of a precious Australian sedimentary opal derived from Coober Pedy
Authors:
A. Smallwood University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences P.O. Box 123 Broadway Sydney NSW 20007 Australia

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P. Thomas University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences P.O. Box 123 Broadway Sydney NSW 20007 Australia

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A. Ray University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences P.O. Box 123 Broadway Sydney NSW 20007 Australia

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P. Šimon Slovak University of Technology Institute Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovak Republic

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Pages:
685–688
Online Publication Date:
10 Jun 2009
Publication Date:
01 Aug 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0076-6
Keywords:
Amorphous silica; Diffusion coefficient; Opal; Dehydration
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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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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