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

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

RESUMO

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.

MATERIAIS

Número do produto

Marca

Descrição do produto

239216

Sigma-Aldrich

Carbonato de cálcio, ACS reagent, ≥99.0%, powder

12010

Sigma-Aldrich

Carbonato de cálcio, puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E170, precipitated, 98.5-100.5% (based on anhydrous substance)

310034

Sigma-Aldrich

Carbonato de cálcio, powder, ≤50 μm particle size, 98%

C6763

Sigma-Aldrich

Carbonato de cálcio, ReagentPlus^®

398101

Sigma-Aldrich

Carbonato de cálcio, ACS reagent, chelometric standard, 99.95-100.05% dry basis

481807

Sigma-Aldrich

Carbonato de cálcio, 99.999% trace metals basis