Coesite Formation at Ambient Pressure and Low Temperatures
Joint Authors
Martínez, J. R.
Vázquez-Durán, A.
Martínez-Castañón, G.
Ortega-Zarzosa, G.
Palomares-Sánchez, S. A.
Ruiz, Facundo
Source
Advances in Materials Science and Engineering
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2008-08-13
Country of Publication
Egypt
No. of Pages
6
Abstract EN
Partial crystallization of silica xerogel in the form of coesite has been obtained at low-pressure conditions and temperatures of ∼565∘C, in samples containing chlorophyll aggregates dispersed in amorphous silica.
Silica xerogel samples were prepared by the sol-gel method using an ethanol:H2O:TEOS molar ratio of 4:11.6:1 and loaded with extracts from frozen spinach leaves.
The silica xerogel microstructure of the powders was studied as a function of annealing temperature.
It was found that partial crystallization of the glass matrix in the form of coestite was obtained at lower pressure than those specified by the phase diagram.
Chlorophyll aggregates were added to the starting solutions which, upon thermal treatments, form small colloidal particles in the glass matrix.
The presence of coesite is corroborated by the Rietveld refinement method.
American Psychological Association (APA)
Martínez, J. R.& Vázquez-Durán, A.& Martínez-Castañón, G.& Ortega-Zarzosa, G.& Palomares-Sánchez, S. A.& Ruiz, Facundo. 2008. Coesite Formation at Ambient Pressure and Low Temperatures. Advances in Materials Science and Engineering،Vol. 2008, no. 2008, pp.1-6.
https://search.emarefa.net/detail/BIM-987698
Modern Language Association (MLA)
Martínez, J. R.…[et al.]. Coesite Formation at Ambient Pressure and Low Temperatures. Advances in Materials Science and Engineering No. 2008 (2008), pp.1-6.
https://search.emarefa.net/detail/BIM-987698
American Medical Association (AMA)
Martínez, J. R.& Vázquez-Durán, A.& Martínez-Castañón, G.& Ortega-Zarzosa, G.& Palomares-Sánchez, S. A.& Ruiz, Facundo. Coesite Formation at Ambient Pressure and Low Temperatures. Advances in Materials Science and Engineering. 2008. Vol. 2008, no. 2008, pp.1-6.
https://search.emarefa.net/detail/BIM-987698
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-987698
