Amorphous Magnesium–Calcium Carbonate Phosphate: Crystallization Paced by the Reaction Solution Concentration

• DOI: 10.1021/acs.cgd.3c01420
• Publication Date: 2024-06-10T04:31:26Z
• Authors: Yibo Zhang; Jia-hua Liu; Yun-chen Long; Xinxue Tang; Jing Zhong; Hanzhu Zhang; Jian Lu; Yang Yang Li
• Keywords: Amorphous calcium carbonate; Amorphous calcium phosphate

The presence of magnesium and phosphorus in calcium carbonate-based biominerals is increasingly found. Both elements play a significant role the biomineralization process amorphous carbonate (ACC). While extensive research has focused on effects their compositions, less attention given to influence precursor solution concentrations, which essential for unraveling crystallization mechanism. Herein, taking phosphate (MgACCP) (molar ratio Ca2+/Mg2+/CO32–/PO43– fixed at 4:1:4:1) as example, we report that stability highly depends concentrations. Moderate concentrations (0.04–0.6 M) lead faster within week production bundled nanofibers. In more diluted solutions (0.01 M), accumulation Ca2+ CO32– boundaries colloidal nanobubbles leads hydration, stabilizes ACC. Conversely, concentrated solutions, greater amount Mg2+ homogeneous binds with water preserve state MgACCP. hydration level determined be critical factor determining rate. These findings offer new insights into mechanism morphology control bioceramics.