Synthesis and characterization of spherical porous calcium carbonate with ordered secondary structures in the presence of polymer with double hydrophilic ionic moieties

Sulfonated poly(aspartic acid) (SPASP) of narrow polydispersity was successfully employed in the facile synthesis of porous calcium carbonate microspheres with regular trigonal star-like secondary structure units and significantly improved surface area (56.3 m(2) g(-1)). Based on the CaCO3 particles morphology through different aging times, a mechanism for the formation of porous CaCO3 microspheres with trigonal star-like secondary structures in the presence of SPASP was proposed.