Synthesis of calcium carbonate in a pure ethanol and aqueous ethanol solution as the solvent

Seo, Kang-Seok; Han, Choon; Wee, Jung‐Ho; Park, Jin-Koo; Ahn, Ji-Whan

doi:10.1016/j.jcrysgro.2004.11.416

Cited by 93 publications

(69 citation statements)

References 29 publications

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“…These clusters are charged particles in equilibrium with their ions and they can grow or collide to produce amorphous CaCO 3 nuclei (Bots et al, 2012). Therefore, certain additives were introduced into the crystal growing medium to alter the surface charge of the growing nuclei and to inhibit the CaCO 3 growth (Liu et al, 2008;Seo et al, 2005;Sheng et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Stability of CaCO3 in Ca(OH)2 solution

Kilic

Toprak

Ozdemir

2016

International Journal of Mineral Processing

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The effect of calcium hydroxide (Ca(OH) 2 ) on the stability of calcium carbonate (CaCO 3 ) particles was investigated with respect to the surface potential and particle size. Both CaCO 3 and Ca(OH) 2 were dissolved in ultrapure water at concentrations up to 100 mM. The solubility limits were about 18 mM for Ca(OH) 2 and about 0.13 mM for CaCO 3 at 23°C in water. Dissolution of commercial CaCO 3 in 10 mM of Ca(OH) 2 solution and dissolution of Ca(OH) 2 in 10 mM of CaCO 3 slurry were also studied at similar conditions. Conductivity, pH, zeta potential, and average particle sizes were measured for each solution. The morphological characteristics of the particles were analyzed by the SEM images. It was found that the zeta potential of CaCO 3 particles was greater than +30 mV when they were placed in the Ca(OH) 2 solution compared to a zeta potential value of −10 mV in water. It was concluded that the Ca(OH) 2 solution is a stabilizer for the CaCO 3 particles.

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Section: Introductionmentioning

confidence: 99%

Stability of CaCO3 in Ca(OH)2 solution

Kilic

Toprak

Ozdemir

2016

International Journal of Mineral Processing

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“…These clusters are charged particles in equilibrium with their ions and they can grow or collide to produce CaCO 3 nuclei. Therefore, certain additives were introduced into the crystal growing medium to alter the surface charge of the growing nuclei and to inhibit the CaCO 3 growth [16][17][18][19]. Nano-CaCO 3 particles can be produced when the newly produced particles are stabilized by adjusting the surface potential of the particles.…”

Section: Introductionmentioning

confidence: 99%

Rice-like hollow nano-CaCO 3 synthesis

Ulkeryildiz¹,

Kilic²,

Ozdemir³

2016

Journal of Crystal Growth

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a b s t r a c tWe have shown that Ca(OH) 2 solution is a natural stabilizer for CaCO 3 particles. We designed a CO 2 bubbling crystallization reactor to produce nano-CaCO 3 particles in homogenous size distribution without aggregation. In the experimental set-up, the crystallization region was separated from the stabilization region. The produced nanoparticles were removed from the crystallization region into the stabilization region before aggregation or crystal growth. It was shown that rice-like hollow nano-CaCO 3 particles in about 250 nm in size were produced with almost monodispersed size distribution. The particles started to dissolve through their edges as CO 2 bubbles were injected, which opened-up the pores inside the particles. At the late stages of crystallization, the open pores were closed as a result of dissolution-recrystallization of the newly synthesized CaCO 3 particles. These particles were stable in Ca(OH) 2 solution and no aggregation was detected. The present methodology can be used in drug encapsulation into inorganic CaCO 3 particles for cancer treatment with some modifications.

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“…16,18 Aragonite has been shown to precipitate at ambient conditions when alcohol is present in the solution, 15,17 and a polymorph discrimination of CaCO 3 has been realized by varying the water−ethanol ratio, for example. 8,15,19 The results from research on the effects of alcohols on CaCO 3 formation are difficult to combine or compare.…”

Section: ■ Introductionmentioning

confidence: 99%

Crystallization of CaCO₃in Water–Alcohol Mixtures: Spherulitic Growth, Polymorph Stabilization, and Morphology Change

Sand

Rodríguez-Blanco

Makovicky

et al. 2011

Crystal Growth & Design

191

189

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The presence of alcohol in binary alcohol− water mixtures can affect the precipitation pathways of anhydrous crystalline CaCO 3 polymorphs and their morphology. We explored the formation pathways and the effects of several parameters on calcite, vaterite, and aragonite: concentration of simple alcohols, time, and shaking speed, and we derived a multiparameter model for predicting what phase is preferred. We found that shaking speed and alcohol concentration are the most important parameters for affecting the stability of vaterite and aragonite and for changing vaterite morphology, from cauliflower-shaped, spherical aggregates, to dendritic, flatter structures. In all our experiments, the precipitated aragonite was twinned, and both the vaterite and aragonite can be interpreted to form through spherulitic growth. Classical growth theory fully describes their formation; there is no need to invoke the popular hypothesis for nonclassical growth by self-assembly of nanocrystals. These studies, and future work with solutions of low water activity, are paving the way to a better understanding of how organisms select their preferred polymorph and engineer CaCO 3 morphology during biomineralization.

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Synthesis of calcium carbonate in a pure ethanol and aqueous ethanol solution as the solvent

Cited by 93 publications

References 29 publications

Stability of CaCO3 in Ca(OH)2 solution

Stability of CaCO3 in Ca(OH)2 solution

Rice-like hollow nano-CaCO 3 synthesis

Crystallization of CaCO₃in Water–Alcohol Mixtures: Spherulitic Growth, Polymorph Stabilization, and Morphology Change

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Synthesis of calcium carbonate in a pure ethanol and aqueous ethanol solution as the solvent

Cited by 93 publications

References 29 publications

Stability of CaCO3 in Ca(OH)2 solution

Stability of CaCO3 in Ca(OH)2 solution

Rice-like hollow nano-CaCO 3 synthesis

Crystallization of CaCO3in Water–Alcohol Mixtures: Spherulitic Growth, Polymorph Stabilization, and Morphology Change

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Product

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Crystallization of CaCO₃in Water–Alcohol Mixtures: Spherulitic Growth, Polymorph Stabilization, and Morphology Change