Skip to Content
Merck

Freeze-drying yields stable and pure amorphous calcium carbonate (ACC).

Chemical communications (Cambridge, England) (2013-03-13)
Johannes Ihli, Alexander N Kulak, Fiona C Meldrum
ABSTRACT

A simple synthetic method is presented for the precipitation of high purity, dry amorphous calcium carbonate (ACC) based on freeze-drying saturated, counter ion free CaCO3 solutions, where the ACC produced shows an extended atmospheric stability. Translation of the methodology to amorphous calcium phosphate demonstrates the generality of the approach.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Calcium carbonate, ACS reagent, chelometric standard, 99.95-100.05% dry basis
Supelco
Calcium carbonate, reference material for titrimetry, certified by BAM, ≥99.5%
Sigma-Aldrich
Calcium carbonate, anhydrous, free-flowing, Redi-Dri, ReagentPlus®, ≥99%
Sigma-Aldrich
Calcium carbonate, ACS reagent, ≥99.0%, powder