FT-NIR and DSC characterisation of water in opal

Thomas, P; Chauviré, B; Flower-Donaldson, K; Aldridge, L; Smallwood, A; Liu, B

FT-NIR and DSC characterisation of water in opal

Thomas, P

Chauviré, B Flower-Donaldson, K Aldridge, L Smallwood, A Liu, B

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Ceramics International, 2020, 46, (18), pp. 29443-29450
Issue Date:: 2020-12-15

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Field	Value	Language
dc.contributor.author	Thomas, P https://orcid.org/0000-0001-6962-2121
dc.contributor.author	Chauviré, B
dc.contributor.author	Flower-Donaldson, K
dc.contributor.author	Aldridge, L
dc.contributor.author	Smallwood, A
dc.contributor.author	Liu, B
dc.date.accessioned	2020-11-27T02:33:18Z
dc.date.available	2020-11-27T02:33:18Z
dc.date.issued	2020-12-15
dc.identifier.citation	Ceramics International, 2020, 46, (18), pp. 29443-29450
dc.identifier.issn	0272-8842
dc.identifier.issn	1873-3956
dc.identifier.uri	http://hdl.handle.net/10453/144401
dc.description.abstract	© 2020 Elsevier Ltd and Techna Group S.r.l. Opal is a hydrous silica (Si02.nH2O) formed through a dissolution-precipitation process. The formation process incorporates water into the structure as bound silanol and molecular water. As the water is distributed in a range of states, multiple methods of characterisation are required to identify each state. This study reports the results of temperature dependent FT-NIR and DSC investigation on natural opal samples of the opal-A (amorphous) and opal-CT (poorly crystalline cristobalite with tridymitic stacking faults) types. Significant differences in the melting behaviour of crystallisable water as well as differences in the spectral characteristics of the non-crystallisable molecular water are observed. These differences are ascribed to the different microstructures of the opal types.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Ceramics International
dc.relation.isbasedon	10.1016/j.ceramint.2020.05.026
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	03 Chemical Sciences, 09 Engineering, 19 Studies in Creative Arts and Writing
dc.subject.classification	Materials
dc.title	FT-NIR and DSC characterisation of water in opal
dc.type	Journal Article
utslib.citation.volume	46
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
utslib.for	19 Studies in Creative Arts and Writing
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
utslib.copyright.embargo	2022-12-15T00:00:00+1000Z
dc.date.updated	2020-11-27T02:33:09Z
pubs.issue	18
pubs.publication-status	Accepted
pubs.volume	46
utslib.citation.issue	18

Abstract:

© 2020 Elsevier Ltd and Techna Group S.r.l. Opal is a hydrous silica (Si02.nH2O) formed through a dissolution-precipitation process. The formation process incorporates water into the structure as bound silanol and molecular water. As the water is distributed in a range of states, multiple methods of characterisation are required to identify each state. This study reports the results of temperature dependent FT-NIR and DSC investigation on natural opal samples of the opal-A (amorphous) and opal-CT (poorly crystalline cristobalite with tridymitic stacking faults) types. Significant differences in the melting behaviour of crystallisable water as well as differences in the spectral characteristics of the non-crystallisable molecular water are observed. These differences are ascribed to the different microstructures of the opal types.

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http://hdl.handle.net/10453/144401