Journal ArticleDOI
Factors affecting the phase and morphology of CaCO3 prepared by a bubbling method
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In this paper, the influence of preparation conditions on the phase and morphology of precipitated calcium carbonate (PCC) was discussed with the help of XRD and SEM measurements.Abstract:
Precipitated calcium carbonate (PCC) was prepared by bubbling a CO 2 /N 2 mixed gas into a CaCl 2 solution. The influence of preparation conditions on the phase and morphology of PCC was discussed with the help of XRD and SEM measurements. The results showed that the initial CaCl 2 concentration, flow rate and temperature play an important role on the morphology of PCC. At low initial CaCl 2 concentration or high flow rate, spherical vaterite was preferably formed. Otherwise, the rhombic calcite was ready to form. Temperature is a determining factor on the formation of aragonite. Needle-like aragonite was precipitated at 60 °C. The results also indicated that both the bubbling time and stirring rate have a minor effect on the phase and morphology of PCC.read more
Citations
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Controlling Mineral Morphologies and Structures in Biological and Synthetic Systems
Fiona C. Meldrum,Helmut Cölfen +1 more
TL;DR: A comparison of Silicification in Diatoms and Bioinspired Routes to Controlling Crystal Morphologies shows the importance of knowing the carrier and removal status of the substance before and during silicification.
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Biomimetic Model Systems for Investigating the Amorphous Precursor Pathway and Its Role in Biomineralization
TL;DR: This review aims to provide a link between the prior literature and the new literature, which might be useful to newcomers in the field, and demonstrate that there may be certain unifying principles found in biomineral systems that seem widely diverse, such as from diatoms, to mollusk shells, to vertebrate bones and teeth.
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Calcium Carbonate Polyamorphism and Its Role in Biomineralization : How Many Amorphous Calcium Carbonates Are There?
TL;DR: It is shown that consideration of the amorphous forms of calcium carbonate within the physical notion of polyamorphism leads to new insights when it comes to the mechanisms by which polymorphic structures can evolve in the first place.
Journal ArticleDOI
Proto-calcite and proto-vaterite in amorphous calcium carbonates.
Denis Gebauer,Philips N. Gunawidjaja,J. Y. Peter Ko,Zoltán Bacsik,Baroz Aziz,Lijia Liu,Yongfeng Hu,Lennart Bergström,Cheuk-Wai Tai,Tsun-Kong Sham,Mattias Edén,Niklas Hedin +11 more
TL;DR: Amorphous order: Amorphous calcium carbonates (ACC) have an intrinsic structure relating to the crystalline polymorphs of calcite and vaterite and the proto-crystalline structures of calcium carbonate and calcite.
Journal ArticleDOI
Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism
TL;DR: In this paper, the authors present a summary of current knowledge and recent investigations entailed mechanistic studies on the formation of the precipitated CaCO3 and the influences of the synthesis factors on the polymorphs.
References
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Journal ArticleDOI
Preparation of Uniform Needle-Like Aragonite Particles by Homogeneous Precipitation.
TL;DR: It was found that the formation of different polymorphs of calcium carbonate was affected mostly by agitation and concentration of reactants, as well as by the mixing procedure, and the presence of sulfonate or sulfate ions promoted precipitation of vaterite and calcite.
Journal ArticleDOI
Vaterite growth and dissolution in aqueous solution. I, Kinetics of crystal growth
TL;DR: In this article, the growth kinetics of vaterite (CaCO3) from aqueous solution between about 10 and 45°C and at ionic strengths from 15mM to 315mM were determined by recording pH as a function of time and analysing these data by a BASIC computer program, correcting for complexes and using activity coefficients.
Journal ArticleDOI
Crystallization and Transformation Mechanism of Calcium Carbonate Polymorphs and the Effect of Magnesium Ion.
TL;DR: Magnesium ion is selectively included in calcite and causes the increase of the attained concentration and the remarkable change in the morphology of calcite especially in 0.05 mol/L solution.
Journal ArticleDOI
Particle morphology of calcium carbonate precipitated by gas-liquid reaction in a Couette-Taylor reactor
TL;DR: In this article, the morphology and size of calcium carbonate particles produced by CO2-Ca(OH)2 reaction precipitation in a Couette-Taylor reactor were investigated experimentally.
Journal ArticleDOI
Nucleation and growth of calcium carbonate by an electrochemical scaling process
TL;DR: In this paper, the authors used transmission electron microscopy to identify the crystal structure of small nuclei and obtained calcite, aragonite or vaterite crystal forms depending on experimental conditions.
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