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Nanomaterials (Basel). 2019 Aug 15;9(8). pii: E1169. doi: 10.3390/nano9081169.

Functionalized Multiwalled CNTs in Classical and Nonclassical CaCO3 Crystallization.

Author information

1
Department of Biological and Animal Sciences, Faculty of Veterinary and Animal Sciences, University of Chile, Santiago P.O. Box 2-15, Chile. aneira@uchile.cl.
2
Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, San Miguel, Santiago 8900000, Chile.
3
Department of Biological and Animal Sciences, Faculty of Veterinary and Animal Sciences, University of Chile, Santiago P.O. Box 2-15, Chile.
4
Physical Chemistry, Department of Chemistry, University of Konstanz, 78464 Konstanz, Germany.
5
Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, S. Livingstone 1007, Chile.
6
Physical Chemistry, Department of Chemistry, University of Konstanz, 78464 Konstanz, Germany. helmut.coelfen@uni-konstanz.de.

Abstract

Multiwalled carbon nanotubes (MWCNTs) are interesting high-tech nanomaterials. MWCNTs oxidized and functionalized with itaconic acid and monomethylitaconate were demonstrated to be efficient additives for controlling nucleation of calcium carbonate (CaCO3) via gas diffusion (GD) in classical as well as nonclassical crystallization, yielding aragonite and truncated calcite. For the first time, all amorphous calcium carbonate (ACC) proto-structures, such as proto calcite-ACC, proto vaterite-ACC and proto aragonite-ACC, were synthesized via prenucleation cluster (PNC) intermediates and stabilized at room temperature. The MWCNTs also showed concentration-dependent nucleation promotion and inhibition similar to biomolecules in nature. Incorporation of fluorescein-5-thiosemicarbazide (5-FTSC) dye-labeled MWCNTs into the CaCO3 lattice resulted in fluorescent hybrid nanosized CaCO3. We demonstrate that functionalized MWCNTs offer a good alternative for controlled selective crystallization and for understanding an inorganic mineralization process.

KEYWORDS:

amorphous calcium carbonate; calcite; calcium carbonate; gas diffusion crystallization; mineralization; multiwalled carbon nanotubes; prenucleation cluster; vaterite

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