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. 2017 Jan 20;7:41049. doi: 10.1038/srep41049

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Inset refers to the percentage of Si sites obtained by decovoluting the ²⁹Si MAS NMR spectra. Difference to 100% is due to the presence of small amounts of C₃SiO (M units at ca 10 ppm) and SiO₄ (Q units at ca −108 ppm).