The effects of organic additives on induction time and characteristics of precipitated calcium carbonate

Isopescu, Raluca; Mateescu, C. D.; Mihai, Mihaela; Dabija, Gabriel

doi:10.1016/j.cherd.2009.10.002

Cited by 36 publications

(16 citation statements)

References 8 publications

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“…17,18 One can control the crystallinity of the resulted CaCO3 particles, as well as their size, shape and porosity, by changing the synthetic conditions, such as pH values, reagents ratio, 19,20 temperature, 21,22 viscosity of the reaction, 23,24 or by adding organic and inorganic additives. [25][26][27] Also, the synthesis of CaCO3 particles of different phases (vaterite, calcite and aragonite) with control over size and morphology can be performed without additives using a vortex fluidic device. 28 Boulos et al investigated the influence of high shear forces on the phase behavior of CaCO3.…”

Section: Introductionmentioning

confidence: 99%

“…The Ostwald ripening process of crystal growth was shown to replace spherulitic growth of vaterite crystals with the subsequent ripening of vaterite and further calcite formation which is determined by a dissolution–precipitation process . Under normal conditions, vaterite particles undergo phase transition into calcite form in aqueous solutions, since the thermodynamic stability of vaterite is lower than that of calcite. , Such transition occurs naturally over time, since recrystallization in solution provides possible kinetic paths for the transformation of vaterite crystals into more energetically stable forms of calcium carbonate. , One can control the crystallinity of the resultant CaCO 3 particles, as well as their size, shape, and porosity, by changing the synthetic conditions, such as pH values, reagent ratio, , temperature, , or viscosity of the reaction , or by adding organic and inorganic additives. − Also, the synthesis of CaCO 3 particles of different phases (vaterite, calcite, and aragonite) with control over size and morphology can be performed without additives using a vortex fluidic device. For example, Boulos et al investigated the influence of high shear forces on the phase behavior of CaCO 3 …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Controllable Synthesis of Calcium Carbonate with Different Geometry: Comprehensive Analysis of Particle Formation, Cellular Uptake, and Biocompatibility

Bahrom

Goncharenko

Fatkhutdinova

et al. 2019

ACS Sustainable Chem. Eng.

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Carefully designed micro-and nanocarriers can provide significant advantages over conventional macroscopic counterparts in biomedical applications. The set of requirements including a high loading capacity, triggered release mechanisms, biocompatibility, and biodegradability should be considered for the successful delivery realization. Porous calcium carbonate (CaCO3) is one of the most promising platforms, which can encompass all the beforehand mentioned requirements. Here, we study both the particles formation and biological applicability of CaCO3. In particular, anisotropic differently shaped CaCO3 particles were synthesized using green sustainable approach based on co-precipitation of calcium chloride and sodium carbonate/bicarbonate at different ratios in the presence of organic additives. The impact of salts concentrations, reaction time, as well as organic additives was systematically researched to achieve controllable and reliable design of CaCO3 particles. It has been demonstrated that the crystallinity (vaterite or calcite phase) of particles depends on the initial salts' concentrations. The loading capacity of prepared CaCO3 particles is determined by their surface properties such as specific surface area, pore size and zetapotential. Differently shaped CaCO3 particles (spheroids, ellipsoids, toroids) were used to evaluate their uptake efficiency on the example of C6 glioma cells. The results show that the ellipsoidal particles possess a higher probability for internalization by cancer cells. All tested particles were also found to have a good biocompatibility. The capability to design physicochemical properties of CaCO3 particles has a significant impact on drug delivery applications, since the particles geometry substantially affects cell behavior (internalization, toxicity) and allows outperforming standard spherical counterparts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis of Calcium Carbonate with Different Geometry: Comprehensive Analysis of Particle Formation, Cellular Uptake, and Biocompatibility

Bahrom

Goncharenko

Fatkhutdinova

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Thus, it has been reported that ultrasonic irradiation can accelerate or retard precipitation , change the crystal size distribution and shape of crystals , or cause agglomeration of particles of different materials. Several authors have been investigating the effect of ultrasound application on the precipitation of calcium carbonate , particularly on its crystal growth , particle size , aggregation , and scaling . Thus the effect of different parameters relevant for sonication, like ultrasonic intensity, type and size of the horn, immersion depth or cavitation has been analysed.…”

Section: Introductionmentioning

confidence: 99%

Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation

Džakula

Kontrec

Ukrainczyk

et al. 2014

Crystal Research and Technology

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This paper reports on the precipitation of CaCO 3 polymorphs, having various crystal morphologies under different conditions. In particular, systems that were subject to ultrasonic irradiation were compared to the corresponding reference systems in the absence of such a treatment. The application of ultrasonic irradiation predominantly resulted in a change of particle size distribution and polymorphic composition of the precipitate, in comparison to the reference systems. Thus, it was found that the supersaturation and temperature influenced the size distribution, in both the reference and sonicated systems. A mixture of calcite, vaterite and aragonite was obtained in all reference systems, at 25°C. At this temperature, the sonication caused the vaterite content to increase, while aragonite was not detected. In reference and sonicated systems at 80°C, only aragonite precipitated. The results also indicate that the principle parameter responsible for the morphology of vaterite was the initial supersaturation: at higher supersaturation spherical vaterite particles precipitated, while at lower supersaturation hexagonal platelets were obtained. The morphological investigations also indicated different mechanisms of vaterite formation in the systems in which precipitation was initiated at higher supersaturation: spherulitic growth of vaterite was observed in sonicated systems, while the aggregation of primary particles was predominant in the reference systems. At lower supersaturation, the effect of c(Ca 2+ )/c(CO 3 2− ) on the morphology of hexagonal platelets of vaterite was observed as well. By varying the c(Ca 2+ )/c(CO 3 2− ), significant changes of the polymorphic composition were observed only in the sonicated systems, at 25°C.

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“…Two of the most common scales found in oilfield production wells and surface facilities pipelines are calcium carbonate (calcite) and calcium sulfate (anhydrite and gypsum). − To manage a potential scaling problem, it is essential to know where and how much scales form during oil and water production. Hence, several authors have studied the scaling formation, resulting in the development of experiments and models, which aim to control and minimize the scaling. ,− …”

Section: Introductionmentioning

confidence: 99%

Influence of Calcium Scaling on Corrosion Behavior of Steel and Aluminum Alloys

et al. 2020

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Calcium scaling is a serious problem encountered in the oil and gas industry because it is common that brines produced alongside oil and gas exhibit high concentrations of calcium ions, among others, which is expensive to remedy. The precipitation of calcium salts on the internal wall of the pipelines may occur because of the physical and chemical changes as fluids are produced from downhole to surface facilities. Although different researchers have address scaling and corrosion in the oil and gas industry, there are few reports in the literature relating the corrosion and scaling phenomena simultaneously. Despite there being indications that scales may produce corrosion problems, affecting the mechanical integrity of the infrastructure, there is minimal research in the literature addressing such relations. Previous studies presented aluminum alloys as excellent and reliable materials for applications in the petroleum industry, such as drilling activities. In this work, we evaluate the corrosion behavior of steel and aluminum alloys under highly scaling environments using supersaturated brines. Our results show that the presence of calcium carbonate and calcium sulfate as a scaling environment increases the corrosion rates for aluminum alloys and carbon steel; however, the same environments do not affect the corrosion behavior of stainless steel.

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The effects of organic additives on induction time and characteristics of precipitated calcium carbonate

Cited by 36 publications

References 8 publications

Controllable Synthesis of Calcium Carbonate with Different Geometry: Comprehensive Analysis of Particle Formation, Cellular Uptake, and Biocompatibility

Controllable Synthesis of Calcium Carbonate with Different Geometry: Comprehensive Analysis of Particle Formation, Cellular Uptake, and Biocompatibility

Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation

Influence of Calcium Scaling on Corrosion Behavior of Steel and Aluminum Alloys

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