Abstract:
Calcium carbonate crystallisation was carried out from aqueous solutions of $\mathrm{CaCl_2}$ and $\mathrm{Na_2CO_3}$ salts with the addition of bovine serum albumen at various concentrations. X-ray phase analysis, optical and electron microscopy showed that the morphology, size and number of crystallising particles depend on the albumen concentration and crystallisation conditions. It was shown that when the albumen concentration varies from $4.25$ g/l to $5.5$ g/l, the main crystallising phase is vaterite. When albumen is added at a concentration of $4.25$ g/l, the average size of the vaterite particles was $\sim 1$–$3$$\mu$m. It was found that to obtain spherical micron-sized vaterite, it is necessary to maintain the mixing time of the stock solution before adding the albumen mixture. The optimal mixing time of salt solutions with albumen was selected to obtain porous spherical vaterite.
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