Synthesis and study of a well crystallized CaCO3 vaterite showing a new habitus

Dupont, L.; Portemer, F.; Figlarz, the late Michel

doi:10.1039/a607761g

Cited by 113 publications

(110 citation statements)

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“…Additives including certain polymers, [28][29][30] small molecules, 31 and the ammonium ion [32][33][34] can uniquely promote the formation of vaterite, and vaterite has been precipitated in microemulsions of CTAB (cetyl trimethylammonium bromide) and water-in-oil microemulsions of sodium dodecyl sulphate (SDS). 35 A microwave-assisted method was applied to produce vaterite with a range of morphologies from water/ethylene glycol mixtures in the presence of the additives CTAB and SDS, 36 while stacks of vaterite platelets were produced on precipitation from a viscous solution of hydroxyethyl cellulose (HEC).…”

Section: Discussionmentioning

confidence: 99%

Calcium carbonate polymorph control using droplet-based microfluidics

2012

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Calcium carbonate (CaCO 3 ) is one of the most abundant minerals and of high importance in many areas of science including global CO 2 exchange, industrial water treatment energy storage, and the formation of shells and skeletons. Industrially, calcium carbonate is also used in the production of cement, glasses, paints, plastics, rubbers, ceramics, and steel, as well as being a key material in oil refining and iron ore purification. CaCO 3 displays a complex polymorphic behaviour which, despite numerous experiments, remains poorly characterised. In this paper, we report the use of a segmented-flow microfluidic reactor for the controlled precipitation of calcium carbonate and compare the resulting crystal properties with those obtained using both continuous flow microfluidic reactors and conventional bulk methods. Through combination of equal volumes of equimolar aqueous solutions of calcium chloride and sodium carbonate on the picoliter scale, it was possible to achieve excellent definition of both crystal size and size distribution. Furthermore, highly reproducible control over crystal polymorph could be realised, such that pure calcite, pure vaterite, or a mixture of calcite and vaterite could be precipitated depending on the reaction conditions and dropletvolumes employed. In contrast, the crystals precipitated in the continuous flow and bulk systems comprised of a mixture of calcite and vaterite and exhibited a broad distribution of sizes for all reaction conditions investigated.

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Section: Discussionmentioning

confidence: 99%

Calcium carbonate polymorph control using droplet-based microfluidics

2012

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“…In other experiments, a CaCO 3 supersaturated solution was treated with surfactants (Dupont et al, 1997) or polymeric substances (Kirboga and Oner, 2013). In a few experiments, Na 2 CO 3 replaced K 2 CO 3 as the solution containing the carbonate ion (Nebel and Epple, 2008).…”

Section: Isotopic Analysis Of Vateritementioning

confidence: 99%

“…Vaterite has a major hexagonal structure (von Olshausen, 1925) and appears in different morphologies such as spherulitic aggregates (Han et al, 2006;Nebel and Epple, 2008;Mori et al, 2009;Hu et al, 2012) or hexagonal plates (e.g. Johnston et al, 1916;Kamhi, 1963;Dupont et al, 1997;Xu et al, 2006;Kawano et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Kamhi, 1963). Vaterite precipitation experiments generally used either mixtures of several solutions such as K 2 CO 3 , Na 2 CO 3 and CaCl 2 (Kamhi, 1963;Easton and Claugher, 1986;Han et al, 2006;Nebel and Epple, 2008) or CaNO 3 (Davies et al, 1978), sometimes with added surfactants (Mann et al, 1991;Dupont et al, 1997;Mori et al, 2009), or additional organic substrates (Falini et al, 1996;Xu et al, 2006;Kirboga and Oner, 2013). These experiments provided crystals with sizes between a few hundred nanometres and a few micrometres and were mostly restricted to the temperature range of 25-60 • C.…”

Section: Introductionmentioning

confidence: 99%

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Technical Note: A simple method for vaterite precipitation for isotopic studies: implications for bulk and clumped isotope analysis

Kluge

John

2015

Biogeosciences

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Abstract. Calcium carbonate (CaCO 3 ) plays an important role in the natural environment as a major constituent of the skeleton and supporting structure of marine life and has high economic importance as an additive in food, chemicals and medical products. Anhydrous CaCO 3 occurs in the three different polymorphs calcite, aragonite and vaterite, whereof calcite is the most abundant and best characterized mineral. In contrast, little is known about the rare polymorph vaterite, in particular with regard to the oxygen isotope fractionation between H 2 O and the mineral.Synthetic precipitation of vaterite in the laboratory typically involves rapid processes and isotopic non-equilibrium, which excludes isotope studies focused on the characterization of vaterite under equilibrium conditions. Here, we used a new experimental approach that enables vaterite mineral formation from an isotopically equilibrated solution. The solution consists of a ∼ 0.007 mol L −1 CaCO 3 solution that is saturated with NaCl at room temperature (up to 6.4 mol L −1 ). Vaterite precipitated as single phase or major phase (≥ 94 %) in experiments performed between 23 and 91 • C. Only at 80 • C was vaterite a minor phase with a relative abundance of 27 %. The high mineral yield per experiment of up to 235 mg relative to the initially dissolved CaCO 3 amount of on average 360 mg enables an investigation of the oxygen isotope fractionation between the mineral and water, and the determination of clumped isotope values in vaterite.

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“…the usual morphological aspects of vaterite crystals [8,9]. Magnesite (MgCO 3 ) is the natural form of magnesium carbonate: this metamorphic mineral is rarely pure, as it is usually associated with other metals, specially with iron; powder diffraction patterns let assume that magnesite only differs from calcite by its cell parameters [10].…”

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confidence: 99%

Scanning electron microscopy and energy dispersive spectrometric microanalysis of crystalline deposits following evaporation of CO₃H^-, Mg²⁺ and Ca²⁺ containing aqueous solutions

et al. 2000

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Abstract. This paper is the first application of scanning electron microscopy (SEM) and of energy dispersive selection microanalysis (EDS) to the study of natural spa waters used as sprays in current dermatological practice; the aim was to relate the mineral composition of the spray to the sensitory perception recorded by the patients. Crystallized deposits were first obtained on a collodion film, from two spa waters mainly containing hydrogenocarbonate, calcium and magnesium ions, but differing by their Mg/Ca ratio. In order to understand the types of crystals formed, mineral solutions of simpler composition were prepared and submitted to the same process. Among the crystalline varieties of calcium carbonate, calcite and vaterite were characterized; aragonite could not be detected in spa waters deposits, despite the presence of magnesium, which favours the crystallization of this orthorhombic form in the artificial solutions.Keywords. Scanning electron microscopy (SEM) -energy dispersive selection microanalysis (EDS) -bicarbonated (hydrogenocarbonated) spa waters -Calcium carbonate crystallization.

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Synthesis and study of a well crystallized CaCO3 vaterite showing a new habitus

Cited by 113 publications

References 9 publications

Calcium carbonate polymorph control using droplet-based microfluidics

Calcium carbonate polymorph control using droplet-based microfluidics

Technical Note: A simple method for vaterite precipitation for isotopic studies: implications for bulk and clumped isotope analysis

Scanning electron microscopy and energy dispersive spectrometric microanalysis of crystalline deposits following evaporation of CO₃H^-, Mg²⁺ and Ca²⁺ containing aqueous solutions

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Synthesis and study of a well crystallized CaCO3 vaterite showing a new habitus

Cited by 113 publications

References 9 publications

Calcium carbonate polymorph control using droplet-based microfluidics

Calcium carbonate polymorph control using droplet-based microfluidics

Technical Note: A simple method for vaterite precipitation for isotopic studies: implications for bulk and clumped isotope analysis

Scanning electron microscopy and energy dispersive spectrometric microanalysis of crystalline deposits following evaporation of CO3H-, Mg2+ and Ca2+ containing aqueous solutions

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Scanning electron microscopy and energy dispersive spectrometric microanalysis of crystalline deposits following evaporation of CO₃H^-, Mg²⁺ and Ca²⁺ containing aqueous solutions