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

Abstract

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 m² 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.