Cited by 474Calcium Carbonate Crystallization and InhibitionCrystallization and Solubility StudiesMicrobial Applications in Construction Materials

Mechanistic Insights into the Crystallization of Amorphous Calcium Carbonate (ACC)

Bots, Pieter, Benning, Liane G., Rodriguez-Blanco, Juan-Diego, Roncal-Herrero, Teresa, Shaw, Samuel·2012·Crystal Growth & Design

Abstract

Many organisms use amorphous calcium carbonate (ACC) during crystalline calcium carbonate biomineralization, as a means to control particle shape/size and phase stability. Here, we present an in situ small- and wide-angle X-ray scattering (SAXS/WAXS) study of the mechanisms and kinetics of ACC crystallization at rapid time scales (seconds). Combined with offline solid and solution characterization, we show that ACC crystallizes to vaterite via a three-stage process. First, hydrated and disordered ACC forms, then rapidly transforms to more ordered and dehydrated ACC; in conjunction with this, vaterite forms via a spherulitic growth mechanism. Second, when the supersaturation of the solution with respect to vaterite decreases sufficiently, the mechanism changes to ACC dissolution and vaterite crystal growth. The third stage is controlled by Ostwald ripening of the vaterite particles. Combining this information with previous studies, allowed us to develop a mechanistic understanding of the abiotic crystallization process from ACC to vaterite and all the way to calcite. We propose this is the underlying abiotic mechanism for calcium carbonate biomineralization from ACC. This process is then augmented or altered by organisms (e.g., using organic compounds) to form intricate biominerals. This study also highlights the applicability of in situ time-resolved SAXS/WAXS to study rapid crystallization reactions.

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Crossref · 10.1021/cg300676b

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  • Magnesium-free ACC crystallizes rapidly to vaterite via spherulitic growth, followed by slower transformation of vaterite to calcite via dissolution and re-precipitation.

    “Magnesium-free ACC crystallizes rapidly to vaterite via spherulitic growth (Bots et al. 2012), followed by the slower transformation of vaterite to calcite via dissolution and re-precipitation (Rodriguez-Blanco et al. 2011).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Bots et al. 2012

  • In the carbonate system, amorphous ACC precursor transforms to vaterite via spherulitic growth at high supersaturations and leads to spheroidal vaterite aggregates.

    “For the carbonate system it has been demonstrated that the amorphous ACC precursor transforms to vaterite via spherulitic growth (Beck and Andreassen 2010; Andreassen et al. 2010; Bots et al. 2012), and that this reaction occurs at high superaturations and leads to spheroidal vaterite aggregates.”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Bots et al. 2012

  • The morphology (spherical) and size (44 ± 13 nm) of the starting Mg-ACC were similar to that reported for ACC.

    “The morphology (spherical) and size (44 ± 13 nm) of our starting Mg-ACC were also similar to that reported for ACC (e.g., Radha et al. 2010, sample ACC-5, Ø 50-100 nm; Bots et al. 2012, ACC, Ø ~ 40 nm).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Bots et al. 2012

  • This is akin to behavior observed for pure ACC where prior to crystallization an increase in ordering of the amorphous phase was likely accompanied by a lowering in water content and a final transformation to a fully anhydrous amorphous phase.

    “This is akin to the behavior observed for pure ACC (Radha et al. 2010; Bots et al. 2012) where prior to crystallization an increase in ordering of the amorphous phase was also likely accompanied by a lowering in water content and a final transformation to a fully anhydrous amorphous phase.”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Bots et al. 2012

  • The ordering and partial dehydration of Mg-ACC prior to crystallization likely occurs via a mechanism similar to that observed for pure ACC.

    “We have shown that the initially hydrated and highly disordered Mg-ACC forms from solution and we suggest that this Mg-ACC gradually orders and may partially dehydrate prior to its crystallization, and that this likely occurs via a similar mechanism to that observed for pure ACC (Bots et al. 2012).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Bots et al. 2012

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Authors
Bots, P., Benning, L. G., Rodriguez-Blanco, J.-D., Roncal-Herrero, T., & Shaw, S.
Affiliations
  • University of Leeds (GB)
  • Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.
Corresponding author
Shaw, Samuel
Venue
Crystal Growth & Design
Published
2012-05-31
Volume
12
Issue
7
Pages
3806-3814
ISSN
  • 1528-7483 (ISSN-L)
  • 1528-7505
OpenAlex
W2094082807
Cited by
474
References
55
Citations by year
2026: 47 · 2025: 55 · 2024: 40 · 2023: 44 · 2022: 49 · 2021: 40 · 2020: 34 · 2019: 24 · 2018: 34 · 2017: 30 · 2016: 17 · 2015: 22 · 2014: 23 · 2013: 14 · 2012: 1
FWCI
7.78
Type
journal article
Language
en
Open access
closed
Locations
  • Crystal Growth & Design (publishedVersion)
  • Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion)
Topics
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
  • Physical Sciences › Environmental Science › Environmental Engineering › Microbial Applications in Construction Materials
Keywords
amorphous calcium carbonate, calcium carbonate crystallization, vaterite, calcite, biomineralization, spherulite growth, Ostwald ripening, crystallization kinetics, phase transformation

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