Influence of pH on morphology, size and polymorph of room temperature synthesized calcium carbonate particles

Oral, Çağatay M.; Ercan, Batur

doi:10.1016/j.powtec.2018.08.066

Cited by 122 publications

(63 citation statements)

References 57 publications

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“…These can lead to changes in the morphology of the precipitated particles of vaterite. As mentioned before, the addition of an organic solvent to the reaction mixture increases the supersaturation of the solution, hence the formation of vaterite particles considerably smaller in size is observed [10,74]. This is a result of the higher nucleation rate that provides a large number of nucleation sites in these systems.…”

Section: Additivesmentioning

confidence: 78%

“…The pH value of the reaction mixture is an important parameter during calcium carbonate precipitation. It was reported that vaterite is a dominant polymorph in solutions with an initial basic pH [21,42,74]. However, Han et al [55] studied a carbonation system with ammonia as an absorption promoter and found that pure vaterite is formed when the pH is 8, but an increase in the pH value of the reactive mixture resulted in a decrease in the vaterite concentration.…”

Section: Phmentioning

confidence: 99%

“…Vaterite precipitation was promoted in the pH range from 8 to 10 for all compared processes. An extension of this range was possible by conducting precipitation in the presence of ethylene glycol [74] or ionic liquid surfactant [75].…”

Section: Phmentioning

confidence: 99%

“…The addition of an organic solvent may change supersaturation [80], because usually both the solubility of each polymorphs and the activities of ions decreases. Therefore the promotion of vaterite precipitation in aqueous solutions of organic solvents is frequently reported [10,31,73,74]. Moreover, organic solvent and water molecules may be inhomogeneously dispersed.…”

Section: Additivesmentioning

confidence: 99%

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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: Additivesmentioning

confidence: 78%

Section: Phmentioning

confidence: 99%

Section: Phmentioning

confidence: 99%

Section: Additivesmentioning

confidence: 99%

See 2 more Smart Citations

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

Konopacka-Łyskawa

2019

Crystals

102

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“… 48 , 49 The model prediction of a pH between 6 and 7 in the channel ( Figure 3 b) during the static phase further supports the hypothesis that the polymorphic form of the precipitated CC̅ could be vaterite. 50 Due to the complexity of the CC̅ precipitation process, other techniques will be needed to conclude about the exact nature of this polymorph.…”

Section: Resultsmentioning

confidence: 99%

Real Time 3D Observations of Portland Cement Carbonation at CO₂ Storage Conditions

Panduro

Cordonnier

Gawel

et al. 2020

Environ. Sci. Technol.

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Depleted oil reservoirs are considered a viable solution to the global challenge of CO 2 storage. A key concern is whether the wells can be suitably sealed with cement to hinder the escape of CO 2 . Under reservoir conditions, CO 2 is in its supercritical state, and the high pressures and temperatures involved make real-time microscopic observations of cement degradation experimentally challenging. Here, we present an in situ 3D dynamic X-ray micro computed tomography (μ-CT) study of well cement carbonation at realistic reservoir stress, pore-pressure, and temperature conditions. The high-resolution time-lapse 3D images allow monitoring the progress of reaction fronts in Portland cement, including density changes, sample deformation, and mineral precipitation and dissolution. By switching between flow and nonflow conditions of CO 2 -saturated water through cement, we were able to delineate regimes dominated by calcium carbonate precipitation and dissolution. For the first time, we demonstrate experimentally the impact of the flow history on CO 2 leakage risk for cement plugging. In-situ μ-CT experiments combined with geochemical modeling provide unique insight into the interactions between CO 2 and cement, potentially helping in assessing the risks of CO 2 storage in geological reservoirs.

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Formation and Phase Selection of CaCO₃ in the Intervention of Lignin Monomer Model Compounds

Liang¹,

Zhu

Zhang

et al. 2021

Crystal Research and Technology

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The single crystal form and uncontrollable topography of CaCO3 in nature severely restrict its product grade and application. Meanwhile, lignin is still not utilized efficiently. In order to improve this, three types of lignin monomer model compounds as p‐coumaric acid (PCA), ferulic acid (FA), and sinapic acid (SA) are employed to induce the growth of CaCO3 to investigate the relationship between lignin structure and CaCO3 crystallization. The synthesized PCA and CaCO3 composite crystals (PC‐ACCs), FA and CaCO3 composite crystals (F‐ACCs), and SA and CaCO3 composite crystals (S‐ACCs) are characterized by field emission scanning electron microscope (FESEM), X‐ray diffraction (XRD), and Fourier transmission infrared spectroscopy (FTIR) to ascertain their molecular structures and crystal information. The growth rule of the acid and CaCO3 composite crystals (ACCs) induced by the three units is also explored. The results show that the vaterite and calcite of ACCs can be formed selectively. In the presence of PCA, FA, and SA, pH is the key factor on the phase selection of ACCs. The temperature and organic acid type also play important roles on the formation of CaCO3. The ACCs present distinguishing surface topographies at different temperatures. The number of methoxyl in the PCA, FA, and SA decides the phase ratio of vaterite and calcite in the ACCs.

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Influence of pH on morphology, size and polymorph of room temperature synthesized calcium carbonate particles

Cited by 122 publications

References 57 publications

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

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

Real Time 3D Observations of Portland Cement Carbonation at CO₂ Storage Conditions

Formation and Phase Selection of CaCO₃ in the Intervention of Lignin Monomer Model Compounds

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Influence of pH on morphology, size and polymorph of room temperature synthesized calcium carbonate particles

Cited by 122 publications

References 57 publications

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

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

Real Time 3D Observations of Portland Cement Carbonation at CO2 Storage Conditions

Formation and Phase Selection of CaCO3 in the Intervention of Lignin Monomer Model Compounds

Contact Info

Product

Resources

About

Real Time 3D Observations of Portland Cement Carbonation at CO₂ Storage Conditions

Formation and Phase Selection of CaCO₃ in the Intervention of Lignin Monomer Model Compounds