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A multinuclear MAS NMR study of calcium-containing aluminosilicate inorganic polymers
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MacKenzie, Kenneth J. D., Smith, Mark E. and Wong, Alan (2007) A multinuclear MAS NMR study of calcium-containing aluminosilicate inorganic polymers. Journal of Materials Chemistry, Volume 17 (Number 48). pp. 5090-5096. doi:10.1039/b712922j ISSN 0959-9428.
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Official URL: http://dx.doi.org/10.1039/b712922j
Abstract
Natural abundance Ca-43, Al-27 and Si-29 MAS NMR spectra were acquired for a series of aluminosilicate inorganic polymers ( geopolymers) containing up to 50 wt% of Ca( OH)(2), CaCO3, Ca-3( PO4)(2) and both amorphous and crystalline CaSiO3. The Al-27 and Si-29 MAS NMR spectra of these geopolymers were generally consistent with those of conventional materials, with their XRD diffractograms showing the presence of the added crystalline phases. Comparison of the Ca-43 MAS NMR spectra with those of the calcium starting materials suggests that both the calcium silicates and Ca(OH)(2) enter into the geopolymer network, but the spectra of geopolymers containing CaCO3 and Ca-3( PO4)(2) are identical to those of the original compound, suggesting that the role of these materials is simply as a filler. At the highest concentration of CaCO3, the Ca-43 resonance of the aragonite polymorph appears in the geopolymer but disappears on heating at 400 degrees C for 36 h, suggesting that this is a metastable phase formed in situ under the highly alkaline conditions of geopolymer formation and in the presence of calcite nuclei.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Materials Chemistry | ||||
Publisher: | Royal Society of Chemistry | ||||
ISSN: | 0959-9428 | ||||
Official Date: | 2007 | ||||
Dates: |
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Volume: | Volume 17 | ||||
Number: | Number 48 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 5090-5096 | ||||
DOI: | 10.1039/b712922j | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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