Abstract
Stable monodispersed amorphous calcium carbonate (ACC) nanoparticles can be synthesized in ethanol media by a facile method, and crystallization of ACC is kinetically controlled, resulting in the formation of three polymorphs in a mixed solvent of ethanol-water at different pH values.
Highlights
Stable monodispersed amorphous calcium carbonate (ACC) nanoparticles can be synthesized in ethanol media by a facile method, and crystallization of ACC is kinetically controlled, resulting in the formation of three polymorphs in a mixed solvent of ethanol– water at different pH values
Based on the analysis of local atomic environments of ACC by Infrared spectroscopy (IR), solid-state Nuclear Magnetic Resonance (NMR) spectroscopy and extended X-ray absorption fine structures (EXAFS), the local arrangement of atoms in ACC can differ between various ACCs.[10,11,12]
It was discovered that transient biogenic ACC has served as a precursor for subsequent non-classical crystallization,[5,6,7,11,17,18] and has been stable for the whole lifetime of some organisms,[19,20,21] where magnesium cations and phosphate and silicate anions were identified to prevent crystallization of transient ACC materials.[19,22,23,24]
Summary
Stable monodispersed amorphous calcium carbonate (ACC) nanoparticles can be synthesized in ethanol media by a facile method, and crystallization of ACC is kinetically controlled, resulting in the formation of three polymorphs in a mixed solvent of ethanol– water at different pH values. It is worth noting that centrifugation and re-dispersion of the as-synthesized ACC nanoparticles (after reaction for 2 or 3 days, dashed lines) do not change their size distribution, indicating the formation of stable, monodispersed nanoparticles.
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