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

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

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A. Smallwood University of Technology Sydney Department of Chemistry, Materials and Forensic Sciences Sydney Australia NSW 20007 PO Box 123 Broadway

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

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Abstract  

The dehydration of an opal specimen was investigated by thermogravimetric analysis (TG) in powder and bulk forms. The change in geometry resulted in a significant difference in the temperature range in which dehydration occurred with peak temperatures in the differential TG (DTG) curve for the hand ground opal at 203°C and for the bulk opal at 340°C. This difference was attributed to time taken for diffusion of free water in the bulk opal to the specimen surface prior to evolution as a registered mass loss. A model was proposed to account for the diffusion of water and was used to estimate the diffusion coefficient.

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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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