Precipitation of calcium carbonate from a calcium acetate and ammonium carbamate batch system

Prah, Jana; Maček, Jadran; Dražić, Goran

doi:10.1016/j.jcrysgro.2011.03.020

Cited by 35 publications

(28 citation statements)

References 24 publications

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“…The shape of the clusters of rhombohedra is similar to the shape of the clusters formed from the recrystallization of the classic metastable vaterite spheroids produced by other investigators. 8 As the ratio of calcium to strontium, magnesium, or manganese increased in each experimental series, the cation competing with calcium becomes more prominent in the final product. Aragonite appeared at the low concentrations of Sr; but as the ratio of Sr ions to Ca ions increases, strontium-rich calcite and strontianite (Figure 1(b)) make up a large portion of the precipitate.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Production of mixed carbonate phases using ammonium carbonate-metal acetate reactions

Weiss¹,

Moser²,

Torres-Cancel³

et al. 2013

Bioinspired, Biomimetic and Nanobiomaterials

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Materials such as bone, nacre, and fish scales have unique structures that give the material strength as well as ductility.The ultimate goal of our research is to develop new composite materials that have improved strength and ductility compared to conventional materials. The US Army Engineer Research and Development Center is incorporating these design principles to develop hierarchical materials for structural applications. In the present study, the mineralogy and morphology of calcium-containing carbonates precipitated by reacting (NH4) 2 CO 3 with mixed Ca, Sr, Mg, and Mn-acetates was investigated. As the proportion of the non-Ca component increased, the products shifted toward double carbonates and mixtures of double carbonates with single carbonates. Characterization by scanning electron microscopy and X-ray diffraction to determine crystal sizes, morphology, and structure of precipitated phases indicated a potential for re-crystallizing the products to form new composite materials. Ongoing research efforts are focused on using information obtained in the present study to develop composites by hydrothermal recrystallization of metastable phases.

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Section: Resultsmentioning

confidence: 97%

“…8 In addition to calcium acetate alone, mixtures of calcium acetate, strontium acetate, magnesium acetate, or manganese acetate were also used in the procedure. The general reaction proceeds as follows: pores, Whatman no.…”

Section: Methodsmentioning

confidence: 99%

Production of mixed carbonate phases using ammonium carbonate-metal acetate reactions

Weiss¹,

Moser²,

Torres-Cancel³

et al. 2013

Bioinspired, Biomimetic and Nanobiomaterials

View full text Add to dashboard Cite

show abstract

“…Spheroidal aggregates of vaterite crystals were prepared by reacting solutions of ammonium carbonate and calcium acetate [18]. A polymer (polycarbonate) film that was used as the organic component and an electro-transport and electrophoresis technique [19,20] was shown to fill pore spaces in the polymer and create the mineral bridges characteristic of nacre.…”

Section: Methodsmentioning

confidence: 99%

“…Vaterite was produced using a modification of the procedure by Prah et al [18] based on direct addition of the reagents and continuous mixing. Equimolar (0.5M) solutions of ammonium carbonate (reagent-grade Certified ACS/NF, Fisher Scientific) and calcium acetate hydrate (ACS reagent grade).…”

Section: Precipitation Of Vaterite Spheroidsmentioning

confidence: 99%

Development of innovative bio-inspired nanocomposites using electrophoretic deposition and hydrothermal recrystallization

Weiss¹,

Malone²,

Moser³

et al. 2012

WIT Transactions on Ecology and the Environment

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For decades, researchers gradually unveiled the fascinating design principles that give biomaterials extraordinary properties and functionality. The US Army Engineer Research and Development Center (ERDC) is incorporating these design principles to develop hierarchical materials for structural applications. Electrophoretic deposition is one method being explored to create the hierarchical structures. This research details the synthesis of hierarchical nanocomposites composed of calcium carbonate by using electrotransport and electrophoretic deposition to migrate calcium and carbonate ions through a polymer matrix. This process allows better control of the crystal form, size, and location in the polymer matrix, allowing for fabrication of composite materials with optimized mechanical properties for various loading conditions. Other research efforts focused on the use of hydrothermal processing techniques to promote the oriented recrystallization of calcium carbonate. These techniques are being used successfully to fabricate composites for characterization and mechanical testing.

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“…We got inspired by the option to prepare ammonium-carbamate crosslinked organogels of PEI and CO 2 and wanted to investigate if such could be used to prepare calcium carbonates. The case of using such gels as sources of CO 2 was strengthened by the study of Prah et al [35], who had shown that molecular ammonium carbamates could be used in the crystallization of calcium carbonates using solutions of calcium acetate.…”

Section: Introductionmentioning

confidence: 99%

Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates

2017

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Amine-CO 2 chemistry is important for a range of different chemical processes, including carbon dioxide capture. Here, we studied how aspects of this chemistry could be used to prepare calcium carbonates. Chemically crosslinked organogels were first prepared by reacting hyperbranched polyethylene imine (PEI) dissolved in DMSO with carbon dioxide. The crosslinks of the organogel consisted of ammonium-carbamate ion pairs as was shown by IR spectroscopy. These carbamate-rich organogels were subsequently subjected to aqueous solutions of calcium acetate, and amorphous calcium carbonate (ACC) precipitated. The ACC did not crystalize during the mixing for up to 20 h, as was shown by a combination of IR spectroscopy, X-ray diffraction, scanning electron microscopy, and thermal analysis. Some PEI had been included or adsorbed on the ACC particles. Traces of calcite were observed in one sample that had been subjected to water in a work-up procedure.

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Precipitation of calcium carbonate from a calcium acetate and ammonium carbamate batch system

Cited by 35 publications

References 24 publications

Production of mixed carbonate phases using ammonium carbonate-metal acetate reactions

Production of mixed carbonate phases using ammonium carbonate-metal acetate reactions

Development of innovative bio-inspired nanocomposites using electrophoretic deposition and hydrothermal recrystallization

Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates

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