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FTIR (a) and X-ray diffraction (XRD) spectra of (b) CaCO3 crystals nucleated in the presence of different concentrations, 0 μg/mL (i), 25 μg/mL (ii), 50 μg/mL (iii), 75 μg /mL (iv), and 125 μg/mL (v) of PMMA-NPs. The standard FTIR (a, i) and XRD pattern of calcite ((i) PDF # 05-0586) and vaterite phase ((vi) PDF #33-0268) are also given for comparison.
