Precipitation of mixed Ca-Ba, Ca-Cd and Ca-Mn carbonates with distinct morphologies under cooperativity of divalent metal ions and protein

摘要

According to the basic principles of biomineralization, a homogeneous precipitation process involving BSA as the matrix was used to precipitate mixed Ca-Ba, Ca-Cd and Ca-Mn carbonate particles with distinct morphologies and structures at room temperature. The structures and morphologies of these carbonates were investigated using SEM and XRD. It was found that there were distinct differences when two different kinds of divalent metal ions were simultaneously precipitated in the reacting solutions. Moreover, according to the results of FT-IR and TG-DTA, we could conclude that bovine serum albumin also affected the diverse morphologies of Ca-M carbonates besides the influence of divalent metal ions. A self-assembly process coupled with an Ostwald ripening mechanism was also discussed based on a series of time-dependent SEM observations.