Investigations of spherulitic growth in industrial crystallization

Andreassen, Jens‐Petter; Flaten, Ellen Marie; Beck, Ralf; Lewis, Alison

doi:10.1016/j.cherd.2010.01.024

Cited by 59 publications

(57 citation statements)

References 9 publications

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“…In such situation bacteria act as a catalyzer by overcoming a kinetic barrier (e.g., lowering activation energy) preventing the precipitation of a mineral in a supersaturated solution [38]. Morphologies of spherulites observed in the experiments further support that precipitation occurred in the supersaturated conditions via spherulitic growth (Figure 8c,d and Figure 9b) [39][40][41][42]. Spherulitic growth and its mechanism has been reported in various systems (e.g., biotic, and abiotic) [39][40][41][42][43][44].…”

Section: Bacterial Nucleation and Carbonate Precipitationsupporting

confidence: 49%

“…Morphologies of spherulites observed in the experiments further support that precipitation occurred in the supersaturated conditions via spherulitic growth (Figure 8c,d and Figure 9b) [39][40][41][42]. Spherulitic growth and its mechanism has been reported in various systems (e.g., biotic, and abiotic) [39][40][41][42][43][44]. Spherulitic growth of a material can occur via a nucleation controlled growth process with a continuous nucleation of new particles on the surface of existing particles [39].…”

Section: Bacterial Nucleation and Carbonate Precipitationmentioning

confidence: 69%

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Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions

Balcı

Demirel‐Floyd

2016

Minerals

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Abstract:The present study demonstrated formation of Ca and P rich nanoglobules by a mixed natural halophilic population enriched from hypersaline lake sediments in laboratory culture experiments. Nanoglobules consisting of complex mixture of Ca, P, O, and C with minor amount of Mg occurred in the external envelop of bacterial cell in the first week of incubation at various Mg +2 /Ca +2 ratios and salinity at 30 • C. Unlike the control experiments (e.g., non-viable cells and without cells), later aggregation and transformation of nanoglobules caused the precipitation of calcium and/or magnesium carbonates in variable amount depending on the Mg +2 /Ca +2 ratios of the medium after 37 days of incubation. By showing the nucleation of carbonates on bacterial nanoglobules closely associated with the cell surfaces of mixed natural population this study emphasis that formation of nanoglobules may not be specific to a microbial strain or to activity of a particular microbial group. Formation of carbonate nanoglobules under various conditions (e.g., Mg +2 /Ca +2 ratios, salinity) with the same halophilic culture suggest that the although metabolic activity of bacteria have an influence on formation of nanoglobules the mineralogy of nanoglobules may be controlled by the physicochemical conditions of the precipitation solution and the rate of mineral precipitation.

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Section: Bacterial Nucleation and Carbonate Precipitationsupporting

confidence: 49%

Section: Bacterial Nucleation and Carbonate Precipitationmentioning

confidence: 69%

Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions

Balcı

Demirel‐Floyd

2016

Minerals

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“…There is another common argument of whether the spherulites of CaCO3 grow directly from solution by central multidirectional growth or by aggregation of nano-sized precursor crystals. Andreassen and co-workers made a significant effort and found that the former is more likely the true mechanism [38,39]. This conclusion is probably correct for some spherulites, such as the particles constructed by a single layer of radiating nanorods [40].…”

Section: Resultsmentioning

confidence: 71%

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

Chiang

Zhou

2017

Crystals

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CaCO 3 spherulites were found in the myostracum layer of common limpet shells collected from East Sands, St Andrews, Scotland. Their microstructures were revealed by using powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray microanalysis. The formation mechanisms of these spherulites and their morphology evolution were postulated. It was proposed that spherical particles of an inorganic and biological composite formed first. In the centre of each spherical particle a double-layer disk of vaterite crystal sandwiching a biological sheet developed. The disk crystal supplies a relatively strong mirror symmetric dipole field, guiding the orientations of the nanocrystallites and the arrangement of mesorods and, therefore, determining the final morphology of the spherulite.

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“…This evolutionary sequence closely resembles the morphological changes observed in the nucleation of vaterite or amorphous CaCO 3 (ACC) and their transformation to calcite (e.g. Meldrum and Hyde, 2001;Nissenbaum et al, 2008;Andreassen et al, 2010;Rodriguez-Blanco et al, 2011;2012). This may indicate that in the region of the nylon mesh, where the degree of super-saturation of the solution was greatest, the more stable polymorph calcite (and minor aragonite) replaced or recrystallised from an initial rapidly-formed vaterite or ACC.…”

Section: Observed and Predicted Concentration-distance Profilesmentioning

confidence: 83%

“…Soluble organic compounds and lowser supersaturation can also favour the formation of "dumbbell-like" CaCO 3 aggregates and inhibit formation of more spheroidal crystal aggregates (cf. Meldrum and Hyde, 2001;Andreassen et al, 2010). Inskeep and Bloom (1986b) found spherulitic clusters of calcite in pedogenic calcite, and concluded that in the presence of soluble organic matter that strongly inhibits crystal growth, the size of the crystallites is inhibited and continual re-nucleation is needed to precipitate further carbonate.…”

Section: Observed and Predicted Concentration-distance Profilesmentioning

confidence: 99%

A simple reactive-transport model of calcite precipitation in soils and other porous media

Kirk

Versteegen

Ritz

et al. 2015

Geochimica et Cosmochimica Acta

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Calcite formation in soils and other porous media generally occurs around a localised source of reactants, such as a plant root or soil macro-pore, and the rate depends on the transport of reactants to and from the precipitation zone, as well as the kinetics of the precipitation reaction itself. However most studies are conducted using well-mixed systems, in which such transport limitations are largely removed. We developed a mathematical model of calcite precipitation near a source of base in soil, allowing for transport limitations and precipitation kinetics. We tested the model against experimentally-determined rates of calcite precipitation and reactant concentration:distance profiles in columns of soil in contact with a layer of HCO 3 --saturated exchange resin. The model parameter values were determined independently. The agreement between observed and predicted results was satisfactory given experimental limitations, indicating that the model correctly describes the important processes. A sensitivity analysis showed that all model parameters are important, indicating a simpler treatment would be inadequate. The sensitivity analysis showed that the amount of calcite precipitated and the spread of the precipitation zone were sensitive to parameters controlling rates of reactant transport (soil moisture content, salt content, pH, pH buffer power and CO 2 pressure), as well as to the precipitation rate constant. We illustrate practical applications of the model with two examples, viz. the effect of pH changes and CaCO 3 precipitation in the soil around a plant root, and around a soil macro-pore containing a source of base such as urea.

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Investigations of spherulitic growth in industrial crystallization

Cited by 59 publications

References 9 publications

Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions

Formation of Carbonate Nanoglobules by a Mixed Natural Culture under Hypersaline Conditions

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

A simple reactive-transport model of calcite precipitation in soils and other porous media

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