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- W2014863568 abstract "Abstract Imogolite, protoimogolite and two synthetic allophanes (A and B) with very different Si/Al ratios have been pyrolysed over a range of temperatures, and the reactions followed by high-resolution solid-state 27 AI and 29 Si nuclear magnetic resonance (NMR) spectroscopy. The Si(OAl oct ) 3 OH groups of protoimogolite are destroyed at relatively low (∼ 200°C temperatures, whereas the same structures in imogolite are stable to ∼ 300°C. During pyrolysis of both materials there is little change in the observed coordination of AI at temperatures of < 500°C but at 500°C or higher, ∼25% of the NMR-visible Al is converted to tetrahedral coordination. The mechanism of decomposition of both protoimogolite and imogolite is shown to involve the formation of highly branched Si-O-Si chains. As far as can be discerned by 27 Al and 29 Si NMR, allophanes A and B both appear to produce products similar to protoimogolite on pyrolysis." @default.
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- W2014863568 date "1988-06-01" @default.
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- W2014863568 title "Thermal transformations of synthetic allophane and imogolite as revealed by nuclear magnetic resonance" @default.
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- W2014863568 doi "https://doi.org/10.1180/claymin.1988.023.2.05" @default.
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