A novel route to prepare the metastable vaterite phase of CaCO 3  from CaCl 2  ethanol solution and Na 2 CO 3  aqueous solution

Jiang, Jiahu; Wu, Yue; Chen, Chuanjie; Wang, Xuelian; Zhao, Huakang; Xu, Shaohai; Yang, Cancan; Xiao, Bowen

doi:10.1016/j.apt.2018.06.020

Cited by 20 publications

(9 citation statements)

References 34 publications

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“…The total volume of the first solution used can be added immediately to the second solution [50,51] or it can be injected to another one with a controlled rate [52]. Different types of stirring are used to produce a homogeneous reaction mixture.…”

Section: Solution Route (L-l)mentioning

confidence: 99%

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Konopacka-Łyskawa

2019

Crystals

102

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Vaterite is the least thermodynamically stable anhydrous calcium carbonate polymorph. Its existence is very rare in nature, e.g., in some rock formations or as a component of biominerals produced by some fishes, crustaceans, or birds. Synthetic vaterite particles are proposed as carriers of active substances in medicines, additives in cosmetic preparations as well as adsorbents. Also, their utilization as a pump for microfluidic flow is also tested. In particular, vaterite particles produced as polycrystalline spheres have large potential for application. Various methods are proposed to precipitate vaterite particles, including the conventional solution-solution synthesis, gas-liquid method as well as special routes. Precipitation conditions should be carefully selected to obtain a high concentration of vaterite in all these methods. In this review, classical and new methods used for vaterite precipitation are presented. Furthermore, the key parameters affecting the formation of spherical vaterite are discussed.

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Section: Solution Route (L-l)mentioning

confidence: 99%

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Konopacka-Łyskawa

2019

Crystals

102

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“…1,15,16 Slow nucleation rates delay the formation of the more stable polymorphs (aragonite and calcite), so that vaterite can form. 17 Indeed, vaterite crystals were successfully synthesized by using additives containing charged groups such as amines, 18−26 carboxyl groups, 22,27−32 sulfonic groups, 33,34 amino acids, 31,35 peptides, 36 polyols, 37,38 and proteins. 26,39 Vaterite crystals have been synthesized in aqueous solutions, 18−25,28,30,31,36,40−44 alcohol−water mixed solvents, 17,22,34,45 DMF−water mixed solvents, 18,46 and non-aqueous solvents.…”

Section: ■ Introductionmentioning

confidence: 99%

Vaterite Microdisc Mesocrystals Exposing the (001) Facet Formed via Transformation from Proto-Vaterite Amorphous Calcium Carbonate

Zhang

Yan

et al. 2020

Crystal Growth & Design

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Vaterite is the thermodynamically least stable phase of the three anhydrous calcium carbonate phases. So far there have been no reports showing the synthesis of pure phase vaterite single crystals exposing the (001) facet without the aid of any additive. Herein, single crystalline vaterite microdiscs exposing the (001) facet with high surface energy have been successfully obtained for the first time in isopropanol without the presence of any additives. The process progresses via amorphous calcium carbonate (ACC) precursors. To study this, Ca K-edge extended X-ray absorption fine structure characterization was performed under cryo-condition. The results indicate that the ACC precursor has a short-range order structure similar to that of vaterite, previously named “proto-vaterite ACC”. Molecular dynamic (MD) simulations indicate that the binding energy between the (001) facet of vaterite and isopropanol is much higher than those of other facets of vaterite with isopropanol, which might be the reason for the formation of vaterite microdiscs exposing the (001) facet. In summary, the thermodynamically less stable phase vaterite microdiscs exposing the (001) facet were realized for the first time without the presence of any additive, and its formation mechanism was investigated in detail based on the experimental results and MD simulations.

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“…In addition, it can be extended for the industrial production of vaterite particles [7,11,17,18]. The excellent properties of vaterite include a high specific surface area, a higher solubility than calcite and aragonite, a high dispersion, a lower specific gravity, a spherical shape, and a porous internal structure with a particle diameter of 0.05 to 5 µm [11,19,20]. However, controlling the phase transformation of ACC to form pure vaterite is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

“…Controlling phase transformation of ACC to form pure vaterite governed by their kinetic of ions and molecules (from precursor or additive), and the saturation index of the solution resulted in either remain vaterite or aragonite or calcite. Those factors are determined by the reaction temperature, aging times, reaction times, and stirring speed [8,20]. Jiang (2018) reported that increasing aging times 0 to 42 h and reaction temperatures from 0 • C to 60 • C, correspondingly, reduced the amount of vaterite from 90.4% to 81.4% and 85.8% to 70.2% [20].…”

Section: Introductionmentioning

confidence: 99%

“…Those factors are determined by the reaction temperature, aging times, reaction times, and stirring speed [8,20]. Jiang (2018) reported that increasing aging times 0 to 42 h and reaction temperatures from 0 • C to 60 • C, correspondingly, reduced the amount of vaterite from 90.4% to 81.4% and 85.8% to 70.2% [20]. Ševčík et al (2015) found the optimal synthesis conditions for the preparation of pure vaterite (≥99 wt.%) at 60 • C and a stirring speed of 600 rpm without additives using CaCl 2 •H 2 O and KCO 3 as precursors [8].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Porous CaCO3 Vaterite Particles by Simple Solution Method

et al. 2021

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Appropriately engineered CaCO3 vaterite has interesting properties such as biodegradability, large surface area, and unique physical and chemical properties that allow a variety of uses in medical applications, mainly in dental material as the scaffold. In this paper, we report the synthesis of vaterite from Ca(NO3)2·4H2O without porogen to obtain a highly pure and porous microsphere for raw material of calcium phosphate as the scaffold in our future development. CaCO3 properties were investigated at two different temperatures (20 and 27 °C) and stirring speeds (800 and 1000 rpm) and at various reaction times (5, 10, 15, 30, and 60 min). The as-prepared porous CaCO3 powders were characterized by FTIR, XRD, SEM, TEM, and BET methods. The results showed that vaterite with purity 95.3%, crystallite size 23.91 nm, and porous microsphere with lowest pore diameter 3.5578 nm was obtained at reaction time 30 min, temperature reaction 20 °C, and stirring speed 800 rpm. It was emphasized that a more spherical microsphere with a smaller size and nanostructure contained multiple primary nanoparticles received at a lower stirring speed (800 rpm) at the reaction time of 30 min. One of the outstanding results of this study is the formation of the porous vaterite microsphere with a pore size of ~3.55 nm without any additional porogen or template by using a simple mixing method.

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A novel route to prepare the metastable vaterite phase of CaCO 3 from CaCl 2 ethanol solution and Na 2 CO 3 aqueous solution

Cited by 20 publications

References 34 publications

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Vaterite Microdisc Mesocrystals Exposing the (001) Facet Formed via Transformation from Proto-Vaterite Amorphous Calcium Carbonate

Synthesis and Characterization of Porous CaCO3 Vaterite Particles by Simple Solution Method

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