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A Straightforward Treatment of Activity in Aqueous CaCO 3 Solutions and the Consequences for Nucleation Theory
Author(s) -
Kellermeier Matthias,
Picker Andreas,
Kempter Andreas,
Cölfen Helmut,
Gebauer Denis
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201303643
Subject(s) - supersaturation , nucleation , aqueous solution , calcium carbonate , ideal (ethics) , amorphous solid , materials science , carbonate , computer science , thermodynamics , chemistry , crystallography , physics , epistemology , composite material , metallurgy , philosophy
The aqueous calcium carbonate system is rigorously investigated with respect to ionic activity. Ideal treatment is found to be a good approximation at relevant concentrations. The data further show that bound CaCO 3 species cannot be regarded as "inactive" during nucleation but rather appear to play a key role in the phase‐separation process, and that amorphous calcium carbonate (ACC) can be precipitated from much lower levels of supersaturation than previously believed.