A Straightforward Treatment of Activity in Aqueous CaCO<sub>3</sub> Solutions and the Consequences for Nucleation Theory

Kellermeier, Matthias; Picker, Andreas; Kempter, Andreas; Cölfen, Helmut; Gebauer, Denis

doi:10.1002/adma.201303643

Cited by 86 publications

(134 citation statements)

References 35 publications

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“…They correspond to the logarithm of the ion activity product divided by the solubility product of the mineral phase of interest. The solubility product of amorphous calcium carbonate used in the present study was obtained by Kellermeier et al (2014).…”

Section: Saturation Indices Calculationmentioning

confidence: 99%

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

Cam

Georgelin

Jaber

et al. 2015

Geochimica et Cosmochimica Acta

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Please cite this article as: Cam, N., Georgelin, T., Jaber, M., Lambert, J-F., Benzerara, K., In vitro synthesis of amorphous Mg-, Ca-, Sr-and Ba-carbonates: what do we learn about intracellular calcification by cyanobacteria?, Geochimica et Cosmochimica Acta (2015), doi: http://dx. AbstractSome cyanobacteria, including Candidatus Gloeomargarita lithophora, which was isolated from Lake Alchichica (Mexico), can form intracellular carbonates. This contradicts the common paradigm that cyanobacterial calcification is always extracellular and suggests that calcification might be controlled by these cyanobacterial species. Intracellular carbonates have several peculiar characteristics: they are relatively small (between 60 and 500 nm), they are poorly crystalline, and they have Sr/Ca and Ba/Ca ratios much higher than the solution in which the cells grow. It is therefore crucial to understand whether these unique features may indicate the involvement of specific biological processes. Here, in vitro abiotic syntheses were performed to synthesize Mg-, Ca-, Sr-and Ba-containing carbonates with compositions, crystallinities and sizes close to those observed in intracellularly calcifying cyanobacteria.Precipitates were characterized by scanning and transmission electron microscopies coupled with energy dispersive x-ray spectroscopy, thermogravimetric analysis and x-ray diffraction.The size and the poor crystallinity of cyanobacterial intracellular carbonates could be mimicked under these abiotic conditions. It was shown that similarly to Mg, elements such as Sr and Ba can favour stabilization of poorly crystalline carbonates. In contrast, the differential partitioning of Sr, Ba and Ca between the solution and the solids as observed in cyanobacteria could not be mimicked in vitro. This provides keys to a better understanding of biological processes involved in the formation of intracellular carbonates by some cyanobacteria, including the involvement of membrane transporters.3

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Section: Saturation Indices Calculationmentioning

confidence: 99%

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

Cam

Georgelin

Jaber

et al. 2015

Geochimica et Cosmochimica Acta

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“…Crystallization processes in confined environments are essential for a wide range of fields, ranging from scaling in pipelines, to biomineralization, to the construction industry [1][2][3][4][5][6][7][8][9][10][11][12]. All of these processes are characterized by a hindered ion diffusion, locally higher supersaturation, and often heterogeneous crystallization.…”

Section: Introductionmentioning

confidence: 99%

A Micro-Comb Test System for In Situ Investigation of Infiltration and Crystallization Processes

Gruber¹,

Wolf²,

Hoyt³

et al. 2017

Minerals

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Abstract:The investigation of mineralization and demineralization processes is important for the understanding of many phenomena in daily life. Many crystalline materials are exposed to decay processes, resulting in lesions, cracks, and cavities. Historical artifacts, for example, often composed of calcium carbonate (CaCO 3 ), are damaged by exposure to acid rain or temperature cycles. Another example for lesions in a crystalline material is dental caries, which lead to the loss of dental hard tissue, mainly composed of hydroxyapatite (HAp). The filling of such cavities and lesions, to avoid further mineral loss and enable or support the remineralization, is a major effort in both areas. Nevertheless, the investigation of the filling process of these materials into the cavities is difficult due to the non-transparency and crystallinity of the concerned materials. In order to address this problem, we present a transparent, inexpensive, and reusable test system for the investigation of infiltration and crystallization processes in situ, being able to deliver datasets that could potentially be used for quantitative evaluation of the infiltration process. This was achieved using a UV-lithography-based micro-comb test system (MCTS), combined with self-assembled monolayers (SAMs) to mimic the surface tension/wettability of different materials, like marble, sandstone, or human enamel. Moreover, the potential of this test system is illustrated by infiltration of a CaCO 3 crystallization solution and a hydroxyapatite precursor (HApP) into the MCTS.

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“…The crystalline and amorphous structures observed in our experiments indicated the participation of polymer-stablizer liquidlike ACC nanodroplets as the major building blocks in the growth stage, as such complicated structure could not be well explained under the regime of classical crystallization theory [10,19]. However, although observations of the overgrowth indicated an iondominated classical pathway, the roles of other CaCO 3 species such as free ions, ion pairs and small clusters [45,[49][50][51][52] before the final overgrowth stage could not be unambiguously identified based on the previous experiments and data. Nevertheless, both ions and nanoparticles have been found to be the primary units for crystallization according to a recent study on the growth of silicalite-1 [53].…”

Section: Resultsmentioning

confidence: 60%

Anisotropic nanowire growth via a self-confined amorphous template process: A reconsideration on the role of amorphous calcium carbonate

et al. 2016

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A Straightforward Treatment of Activity in Aqueous CaCO₃ Solutions and the Consequences for Nucleation Theory

Cited by 86 publications

References 35 publications

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

A Micro-Comb Test System for In Situ Investigation of Infiltration and Crystallization Processes

Anisotropic nanowire growth via a self-confined amorphous template process: A reconsideration on the role of amorphous calcium carbonate

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A Straightforward Treatment of Activity in Aqueous CaCO3 Solutions and the Consequences for Nucleation Theory

Cited by 86 publications

References 35 publications

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

In vitro synthesis of amorphous Mg-, Ca-, Sr- and Ba-carbonates: What do we learn about intracellular calcification by cyanobacteria?

A Micro-Comb Test System for In Situ Investigation of Infiltration and Crystallization Processes

Anisotropic nanowire growth via a self-confined amorphous template process: A reconsideration on the role of amorphous calcium carbonate

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A Straightforward Treatment of Activity in Aqueous CaCO₃ Solutions and the Consequences for Nucleation Theory