Controlling the kinetic versus thermodynamic crystallisation of calcium carbonate

Dickinson, Steven R.; Henderson, Graham E.; McGrath, Kathryn M.

doi:10.1016/s0022-0248(02)01700-1

Cited by 86 publications

(71 citation statements)

References 15 publications

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“…The presence of metastable phases preceding the crystallization of calcite is favored by highsupersaturation conditions [65]. High pCO 2 and alkaline pH (8.5-10.5) favor the formation of vaterite, which may eventually transform into stable calcite [56,[68][69][70]. Conversely, at room T and low pCO 2 , pH close to neutrality as well as pH [ 11 favor the development of calcite crystals [56,71,72].…”

Section: Phase Evolutionmentioning

confidence: 99%

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

et al. 2012

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Phase and morphology evolution of CaCO 3 precipitated during carbonation of lime pastes via the reaction Ca(OH) 2 ? CO 2 ? CaCO 3 ? H 2 O has been investigated under different conditions (pCO 2 & 10 -3.5 atm at 60 % RH and 93 % RH; pCO 2 = 1 atm at 93 % RH) using XRD, FTIR, TGA, and SEM. Simulations of the pore solution chemistry for different stages and conditions of carbonation were performed using the PHREEQC code to investigate the evolution of the chemistry of the system.

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Section: Phase Evolutionmentioning

confidence: 99%

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

et al. 2012

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“…Calcium carbonate is an exceptional compound that exists everywhere in nature and makes up more than 4% of the Earth's crust which makes the polymorphs calcite, aragonite and vaterite some of the most important rock-forming minerals [1,2]. The present study focusses on travertine, which is a form of limestone normally deposited in springs, during the transfer of carbon dioxide from ground water in a spring, which is highly charged with calcium and bicarbonate.…”

Section: Introductionmentioning

confidence: 99%

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

2017

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Abstract:A microstructural investigation by electron microscopy on a travertine specimen collected from Munigou National Park, Sichuan Province, China revealed evidence of a non-classical reversed crystal growth route previously only discovered in synthetic materials. Examination of the travertine specimen suggests that the presence of organic matter initiates the oriented aggregation of calcite nanocrystallites. Surface re-crystallisation of the aggregates leads to a single crystalline rhombohedral shell with a polycrystalline core. This core-shell structure carries a strong resemblance to synthetic calcite prepared in the presence of chitosan, where the growth of calcite was found to follow the so-called reversed crystal growth process. It is proposed that the similar roles of biomolecules in naturally occurring travertine and chitosan in the synthetic system are based on their isoelectric points and the polymerizable property of long chain chemical structures. This study is important so that the structural similarities between naturally occurring biominerals and biomimetic materials can be further understood.

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“…2b and the tabular aggregates in Fig. 2c are vaterite (Dickinson et al, 2002). The other polymorph of CaCO 3 , aragonite, is not observed for all the synthetic powders (Sunagawa, 1987).…”

Section: Characterizationmentioning

confidence: 85%

Synthesis of Calcium Carbonate Particles in Octylamine/Water Bilayer Systems

Wang

White

Adair

2014

KONA

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Calcium carbonate particles with various shapes and morphologies were prepared via precipitation in an octylamine/water self-assembly bilayer systems. Crystal structure and shape of the CaCO 3 particles were determined by the water to octylamine molar ratio R of the bilayer. At R = 16.0, phase pure calcite particles with a "hopper crystal" morphology were formed, the average particle size of the hopper crystal is 10 μm with welldefined edges on the hopper faces. Decrease the R ratio to 7.2 eventually leads to the formation of 3 μm tabular CaCO 3 particles which are predominated by vaterite structure. For an intermediate R of 10.8, spherical vaterite aggregates and rhombohedral calcite particles were produced. Thermal decomposition of the CaCO 3 particles was observed at around 710°C. The mechanism of particle evolution in the self-assembly bilayer, particularly the formation of "hopper crystal" calcite was discussed.

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Controlling the kinetic versus thermodynamic crystallisation of calcium carbonate

Cited by 86 publications

References 15 publications

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

Synthesis of Calcium Carbonate Particles in Octylamine/Water Bilayer Systems

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