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Characterisation of Class II γ-PGA/bioactive silica hybrids synthesised with calcium chloride (2ECCaCl) or calcium methoxyethoxide (2ECCaME) or without calcium (2EC) with molar ratios of γ-PGA/GPTMS of 2: (a) XRD (b) 29Si MAS NMR spectra and (c) FTIR spectra. Samples where HF was not added are marked with *.
