A crucial process: organic matrix and magnesium ion control of amorphous calcium carbonate crystallization on β-chitin film

CrystEngComm ◽  
2015 ◽  
Vol 17 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Yufei Ma ◽  
Qingling Feng
Keyword(s):  
Aqueous Solution ◽  
Calcium Carbonate ◽  
Organic Matrix ◽  
Water Soluble ◽  
Magnesium Ion ◽  
Magnesium Ions ◽  
Amorphous Calcium Carbonate ◽  
Transformation Processes

ACC transformation processes occurring on chitin film mediated by a water soluble matrix or magnesium ions in aqueous solution were investigated.

Role of Magnesium Ion in the Stabilization of Biogenic Amorphous Calcium Carbonate: A Structure−Function Investigation

2010 ◽  
Vol 22 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Yael Politi ◽  
David R. Batchelor ◽  
Paul Zaslansky ◽  
Bradley F. Chmelka ◽  
James C. Weaver ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Structure Function ◽  
Magnesium Ion ◽  
Amorphous Calcium Carbonate

Effects of Magnesium Ions and Water Molecules on the Structure of Amorphous Calcium Carbonate: A Molecular Dynamics Study

2013 ◽  
Vol 117 (47) ◽  
pp. 14849-14856 ◽  
Author(s):  
Hidekazu Tomono ◽  
Hiroki Nada ◽  
Fangjie Zhu ◽  
Takeshi Sakamoto ◽  
Tatsuya Nishimura ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Calcium Carbonate ◽  
Water Molecules ◽  
Magnesium Ions ◽  
Amorphous Calcium Carbonate

The nanostructural unity of Mollusc shells

2008 ◽  
Vol 72 (1) ◽  
pp. 243-246 ◽  
Author(s):  
Y. Dauphin
Keyword(s):  
Atomic Force Microscopy ◽  
Calcium Carbonate ◽  
Organic Matrix ◽  
Amorphous Calcium Carbonate ◽  
Force Microscopy ◽  
Size And Shape ◽  
Atomic Force ◽  
Scanning Electron ◽  
Mollusc Shells

AbstractCalcite and aragonite shell layers of the main classes of Molluscs are composed of monocrystalline units (prisms, tablets, laths or fibres). Scanning electron and atomic force microscopy studies show these units are composed of small round granules with a thin cortex (amorphous calcium carbonate and/or organic matrix). These granules are organo-mineral composites. A comparison of the size and shape of the granules in different taxa (Mollusca, Brachiopoda) suggests a possible relationship with taxonomy and/or phylogeny.

scholarly journals Influence of amorphous calcium carbonate on strontium ion removability from aqueous solution

2020 ◽  
Vol 128 (8) ◽  
pp. 560-564
Author(s):  
Yuta SHUSEKI ◽  
Fumihiro MIHARA ◽  
Atsuo YASUMORI ◽  
Yasushi IDEMOTO ◽  
Setsuko KOURA ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Calcium Carbonate ◽  
Amorphous Calcium Carbonate ◽  
Strontium Ion

Single Nanogranules Preserve Intracrystalline Amorphicity in Biominerals

2016 ◽  
Vol 672 ◽  
pp. 47-59 ◽  
Author(s):  
Stephan E. Wolf ◽  
Corinna Böhm ◽  
Joe Harris ◽  
Myriam Hajir ◽  
Mihail Mondeshki ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Organic Matrix ◽  
Amorphous Calcium Carbonate ◽  
Extracellular Secretion ◽  
Calcium Carbonate Polymorphs

We revisit the ultrastructural features of different calcareous biominerals and identify remarkable similarities: taxonomically very distant species show a common nanogranular structure, even if different extracellular secretion patterns are employed or calcium carbonate polymorphs formed. By these analyses, we elucidate the locus of the small fraction of intracrystalline organic matrix revealing its intergranular character and localize the intracrystalline amorphous calcium carbonate moiety commonly found in mesocrystalline biominerals and provide a first explanation for the pathway by which it is preserved.

scholarly journals A hydrated crystalline calcium carbonate phase: Calcium carbonate hemihydrate

Science ◽  
2019 ◽  
Vol 363 (6425) ◽  
pp. 396-400 ◽  
Author(s):  
Zhaoyong Zou ◽  
Wouter J. E. M. Habraken ◽  
Galina Matveeva ◽  
Anders C. S. Jensen ◽  
Luca Bertinetti ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Cement Industry ◽  
Industrial Processes ◽  
Magnesium Ions ◽  
Monoclinic Structure ◽  
Ambient Conditions ◽  
Amorphous Calcium Carbonate ◽  
Hydrated Crystal ◽  
Global Carbon

As one of the most abundant materials in the world, calcium carbonate, CaCO3, is the main constituent of the skeletons and shells of various marine organisms. It is used in the cement industry and plays a crucial role in the global carbon cycle and formation of sedimentary rocks. For more than a century, only three polymorphs of pure CaCO3—calcite, aragonite, and vaterite—were known to exist at ambient conditions, as well as two hydrated crystal phases, monohydrocalcite (CaCO3·1H2O) and ikaite (CaCO3·6H2O). While investigating the role of magnesium ions in crystallization pathways of amorphous calcium carbonate, we unexpectedly discovered an unknown crystalline phase, hemihydrate CaCO3·½H2O, with monoclinic structure. This discovery may have important implications in biomineralization, geology, and industrial processes based on hydration of CaCO3.

Enantioselective Recognition of Chiral Guests by the Water-Soluble Chiral Keplerate {Mo132} Spherical Capsule with 30 Inner Lactate Ligands

2019 ◽  
Author(s):  
Nancy Watfa ◽  
Weimin Xuan ◽  
Zoe Sinclair ◽  
Robert Pow ◽  
Yousef Abul-Haija ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Chiral Recognition ◽  
Association Constants ◽  
Water Soluble ◽  
Enantioselective Recognition ◽  
H Nmr ◽  
Dosy Nmr ◽  
Spherical Capsule ◽  
Surface Pores ◽  
Guest Chemistry

Investigations of chiral host guest chemistry are important to explore recognition in confined environments. Here, by synthesizing water-soluble chiral porous nanocapsule based on the inorganic metal-oxo Keplerate-type cluster, {Mo<sub>132</sub>} with chiral lactate ligands with the composition [Mo<sub>132</sub>O<sub>372</sub>(H<sub>2</sub>O)<sub>72</sub>(<i>x-</i>Lactate)<sub>30</sub>]<sup>42-</sup> (<i>x</i> = D or L), it was possible to study the interaction with a chiral guest, L/D-carnitine and (<i>R</i>/<i>S</i>)-2-butanol in aqueous solution. The enantioselective recognition was studied by quantitative <sup>1</sup>H NMR and <sup>1</sup>H DOSY NMR which highlighted that the chiral recognition is regulated by two distinct sites. Differences in the association constants (K) of L- and D-carnitine, which, due to their charge, are generally restricted from entering the interior of the host, are observed, indicating that their recognition predominantly occurs at the surface pores of the structure. Conversely, a larger difference in association constants (K<i><sub>S</sub></i>/K<i><sub>R</sub></i> = 3) is observed for recognition within the capsule interior of (<i>R</i>)- and (<i>S</i>)-2-butanol.

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