Advanced Materials article available online "A Straightforward Treatment of Activity in Aqueous CaCO3 Solutions and the Consequences for Nucleation Theory"
Abstract. 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 CaCO3 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. [Adv. Mater. (2013), DOI: 10.1002/adma.201303643]
new publications available online:
JACS article available online "Mg2+ Tunes the Wettability of Liquid Precursors of CaCO3: Toward Controlling Mineralization Sites in Hybrid Materials"
Abstract. Amorphous and liquid precursors of calcium carbonate are believed to be central species of biomineralization, which serves as an important inspiration for materials chemists in the quest for new and improved organic–inorganic hybrid materials. It has become increasingly clear that magnesium ions exhibit an important function through kinetic stabilization of the metastable precursors. We show that they additionally tune the wettability of liquid precursors of CaCO3, which is a crucial requirement for successful mineralization of proteinaceous organic matrices. Moreover, tunable wettability offers straightforward means to control mineralization sites in organic–inorganic hybrids. [J. Am. Chem. Soc. (2013), DOI: 10.1021/ja404979z]