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      Geopolymer technology: the current state of the art

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          Do Geopolymers Actually Contain Nanocrystalline Zeolites? A Reexamination of Existing Results

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            Characterisation of fly ashes. Potential reactivity as alkaline cements☆

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              29Si NMR study of structural ordering in aluminosilicate geopolymer gels.

              A systematic series of aluminosilicate geopolymer gels was synthesized and then analyzed using 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR) in combination with Gaussian peak deconvolution to characterize the short-range ordering in terms of T-O-T bonds (where T is Al or Si). The effect of nominal Na2O/(Na2O + K2O) and Si/Al ratios on short-range network ordering was quantified by deconvolution of the 29Si MAS NMR spectra into individual Gaussian peaks representing different Q4(mAl) silicon centers. The deconvolution procedure developed in this work is applicable to other aluminosilicate gel systems. The short-range ordering observed here indicates that Loewenstein's Rule of perfect aluminum avoidance may not apply strictly to geopolymeric gels, although further analyses are required to quantify the degree of aluminum avoidance. Potassium geopolymers appeared to exhibit a more random Si/Al distribution compared to that of mixed-alkali and sodium systems. This work provides a quantitative account of the silicon and aluminum ordering in geopolymers, which is essential for extending our understanding of the mechanical strength, chemical and thermal stability, and fundamental structure of these systems.
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                Author and article information

                Journal
                Journal of Materials Science
                J Mater Sci
                Springer Nature
                0022-2461
                1573-4803
                May 2007
                December 2006
                : 42
                : 9
                : 2917-2933
                Article
                10.1007/s10853-006-0637-z
                73a0d78c-bf69-40fe-aec0-c7d6bbc48dae
                © 2007
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