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calcium carbonate vaterite

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Calcium carbonate - CAMEO

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29-4-2016 · Description. A white powder that can occur in three crystalline forms: calcite (hexagonal-rhombohedral), aragonite (orthorhombic) and vaterite. Calcium carbonate occurs naturally in many forms such as chalk, limestone, marble and sea shells.It can be found worldwide and ranges in color (because of impurities) from white to gray to yellow.

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Vaterite: Mineral information, data and localities.

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Plummer, L. N., Busenberg, E. (1982) The solubilities of calcite, aragonite, and vaterite in carbon dioxide-water solutions between 0 and 90° C, and an evaluation of the aqueous model for the system calcium carbonate-carbon dioxide-water.

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Growth of the calcium carbonate polymorph .

15.03.2010 · Our previous findings (Flaten et al., 2009) show that MEG governs calcium carbonate precipitation and promotes formation of the metastable polymorph vaterite. This paper describes crystal growth of vaterite in mixed MEG water solvent with 0–70 wt% MEG at temperatures of 40 and 70 °C in solutions with high calcium to carbonate ratios representative of the production conditions. Results of ...

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Precipitation and Transformation of Vaterite .

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Precipitation and Transformation of Vaterite Calcium Carbonate in the Presence of Some Organic Solvents . by Donata Konopacka-Łyskawa 1,*, Natalia Czaplicka 1, Marcin Łapiński 2, Barbara Kościelska 2 and Rafał Bray 3. 1.

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Surface Structure and Morphology of Calcium .

Size-Controlled Synthesis of Vaterite Calcium Carbonate by the Mixing Method: Aiming for Nanosized Particles. Crystal Growth & Design 2016, 16 (3), 1311-1319. DOI: 10.1021/acs.cgd.5b01422. Paolo Raiteri, Raffaella Demichelis, and Julian D. Gale . Thermodynamically Consistent Force Field for Molecular Dynamics Simulations of Alkaline-Earth Carbonates and Their Aqueous Speciation. The .

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Preparation of calcium carbonate microparticles .

01.05.2014 · Preparation of vaterite calcium carbonate microcapsule. Calcium carbonate microcapsules were prepared by a described method in our recent papers, . A typical procedure is briefly describe as follows: 32 mL of a 3 M ammonium carbonate solution was mixed with 48 mL of a n-hexane solution dissolving 1.0 g of Tween 85, and the resulting solution was emulsified with a homogenizer at .

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Vaterite - an overview | ScienceDirect Topics

A study of calcium carbonate, formed by reaction between calcium chloride and ammonium carbonate, showed that the formation of vaterite is favored by the application of ultrasound (40 kHz, 800 W and 20 kHz, 400 W; Kojima et al., 2010). Without ultrasound, the tendency is for calcite to be created. The particles are smaller and the specific area increases with the ultrasonic wave amplitude. In ...

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Growth of the calcium carbonate polymorph .

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15-3-2010 · Our previous findings (Flaten et al., 2009) show that MEG governs calcium carbonate precipitation and promotes formation of the metastable polymorph vaterite. This paper describes crystal growth of vaterite in mixed MEG water solvent with 0–70 wt% MEG at temperatures of 40 and 70 °C in solutions with high calcium to carbonate ratios .

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Vatérite — Wikipédia

Étymologie et synonymie. La vatérite est ainsi nommée en l'honneur du pédologue et botaniste allemand Heinrich Vater (en).. La vatérite porte aussi le nom de µ-CaCO 3.. Forme des cristaux. La vatérite se présente sous la forme d'aiguilles plutôt trapues, nettement plus que celles de l'aragonite, qui s'articulent, plus qu'elles ne se maclent, soit sous forme de "fleurs", soit sous ...

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EP0459399A1 - Monodisperse vaterite type .

A monodisperse spherical, ellipsoidal or plate - like vaterite calcium carbonate almost free from secondary aggregation is disclosed. The vaterite type calcium carbonate is prepared by the steps of adding 5-20 times mol equivalent of water with respect to unslaked lime to a methanol suspension of 0.5-12 weight % of unslaked lime and/or slaked lime (in case of slaked, conversion is to be made ...

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Encapsulation of anticancer drug cisplatin in vaterite ...

phous calcium carbonate, two hydrated forms; cal-cium carbonate monohydrate (MCC) and calcium carbonate hexahydrate (ikaite) and three anhydrous polymorphs, namely, vaterite, aragonite, and calcite. Vaterite is the thermodynamically least stable polymorph of calcium carbonate [3]. Its synthesis requires special techniques such as use of a very spe-

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Vaterite - Wikipedia

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Abnormal polymorph conversion of calcium .

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However, vaterite is the thermodynamically least stable phase in the three anhydrous crystalline phases of calcium carbonate, and such thermal metastability often transforms it into more stable ...

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Controlled process for precipitating calcium .

(22) 14.01.2016 (43) 21.07.2016 (57) A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at least one carbonate source, whereby precipitated calcium carbonate is produced in the form of calcite and/or aragonite directly without conversion from a vaterite poly-morph.

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Surface Structure and Morphology of Calcium Carbonate ...

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calcium carbonate surfaces, we used the potential parameters previously fitted to calcite and described in a previous paper.44 We verified these potential parameters by simulating the structure of ikaite, a calcium carbonate hexahydrate, and we found good agreement between calculated and .

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Precipitation diagram of calcium carbonate polymorphs: its ...

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calcium and carbonate ions, ln AP, and the vertical axis is the temperature. Equilibrium curves for the formation r eaction of polymorphs of calcium carbonate (calcite, aragonite, vaterite, and ikaite) and amorphous calcium carbonate, which are calculated from their equilibrium constants (Clarkson et al 1992, Plummer and

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Sodium Lignosulfonate Induced Vaterite Calcium .

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Sodium lignosulfonate (SL), a byproduct of the pulping industry, was used as a stabilizer for the mineralization of CaCO 3.In a calcium acetate–urea–water system, the direct aging of the aqueous solution of calcium acetate and urea resulted in the formation of mixed aragonite and vaterite phases or a pure aragonite phase depending on the aging time.

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Sturgeon and paddlefish (Acipenseridae) saggital .

@article{osti_1324076, title = {Sturgeon and paddlefish (Acipenseridae) saggital otoliths are composed of the calcium carbonate polymorphs vaterite and calcite: acipenseridae otoliths are vaterite and calcite}, author = {Pracheil, Brenda M. and Chakoumakos, Bryan C. and Feygenson, Mikhail and Whitledge, Gregory W. and Koenigs, Ryan P. and Bruch, Ronald M.}, abstractNote = {The otoliths of ...

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Precipitation diagram of calcium carbonate polymorphs: its ...

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calcium and carbonate ions, ln AP, and the vertical axis is the temperature. Equilibrium curves for the formation r eaction of polymorphs of calcium carbonate (calcite, aragonite, vaterite, and ikaite) and amorphous calcium carbonate, which are calculated from their equilibrium constants (Clarkson et al 1992, Plummer and

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CALCIUM CARBONATE POWDER .

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Calcium carbonate accounts for more than 4% of the earth's crust. As a result, the three calcium carbonate minerals – calcite, aragonite and vaterite – are among the most important rock ...

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Vaterit – Wikipedia

Vaterit ist ein eher selten vorkommendes Mineral aus der Mineralklasse „Carbonate" (und Verwandte).Es kristallisiert im hexagonalen Kristallsystem mit der chemischen Zusammensetzung Ca[CO 3] und entwickelt nur kleine, faserige bis prismatische Kristalle mit hexagonalem Habitus bis etwa 0,1 mm oder sphärolithische Aggregate, die farblos oder von weißer Farbe sein können.

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