“…Radio-frequency (RF) pulse powers of 62.5 kHz were used for 1 H and 13 C channels for MAS or CPMAS NMR data acquisition. Chemical shifts were externally calibrated with respect to TMS (tetramethysilane) for 1 H and 13 C or 1 N Al(NO 3 ) 3 aqueous solution for 27 Al nucleus …”