Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 106: Issue 2
Correlations between data of 29Si NMR and thermogravimetry for silica/monetite nanocomposites
Authors:
A. J. D. Fernandes Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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J. H. P. Barbosa Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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O. G. Silva Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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M. G. Fonseca Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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L. H. N. Arakaki Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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J. G. P. Espínola Department of Chemistry, CCEN, UFPB, João Pessoa, Brazil

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Pages:
463–467
Online Publication Date:
05 Apr 2011
Publication Date:
01 Nov 2011
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-011-1503-z
Keywords:
Silica/monetite nanocomposites; Thermogravimetry; Calcium phosphate
Restricted access

Abstract

Silica/monetite nanocomposites were synthesized through controlled hydrolysis of tetraethoxysilane at concentrations of 5, 10, 15, and 20% mol/mol of calcium phosphate forming the solids named CaPSil1, CaPSil2, CaPSil3, and CaPSil4, respectively. XRD patterns showed formation of nanocomposites with a decrease in crystallinity. The NMR 29Si spectra suggested an increase in the content of incorporated silica with reduction of Q3 (–SiOH) signal, which contributes for mass loss, in agreement with thermogravimetry. The incorporation of silica increased the chemical stability of the precursor phosphate in an acidic medium.

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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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