Controlling Mechanism of Soluble Phosphates during CaCO3 Whiskers Synthesis
CaCO3 whiskers were synthesized with soluble phosphates by one-step carbonization method, controlling mechanisms were investigated via XRD and FTIR, and it has been indicated that the most stable calcium phosphates in thermodynamics, hydroxyapatite was formed through the reaction of soluble phosphates and Ca(OH)2 in advance before CO2 was introduced, and then [CO32-(OH)] entered the crystal lattices of hydroxyapatite to replace partially [PO43-] to yield B-carbonate hydroxyapatite in the early stage of blowing CO2, which induced aragonite to heterogeneously nucleate as nucleation center and grew into calcium carbonate whiskers by the continuous stack of Ca2+ and CO32-, while other HA selectly adsorbed onto the flanks of CaCO3 to control crystal morphology.
L. X. Li et al., "Controlling Mechanism of Soluble Phosphates during CaCO3 Whiskers Synthesis", Advanced Materials Research, Vol. 92, pp. 47-53, 2010