Figure 4
Characterization of precipitate morphologies. Raman microspectroscopy data collected from both precipitate morphologies (CLSM example images shown on the left, drops are approximately 25 µm in diameter) observed in CaLow (green), CaInt (blue) and CaHigh (orange). Amorphous calcium carbonate was identified by a weak Raman signal at approximately 1084 cm-1, consistent with published Raman spectra for ACC24,34,35. The denser precipitates exhibited Raman spectra with double peaks identical to those of the vaterite standard and published data24,36,37. An ACC standard is not shown here as it was not available and stable ACC could not be generated via experiments for use as a standard. The vaterite standard shown here was generated experimentally and was identified as vaterite using XRD and Raman microspectroscopy.
