Functionalized Multiwalled CNTs in Classical and Nonclassical CaCO3 Crystallization

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...

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Published inNanomaterials (Basel, Switzerland) Vol. 9; no. 8; p. 1169
Main Authors Neira-Carrillo, Andrónico, Vásquez-Quitral, Patricio, Sánchez, Marianela, Farhadi-Khouzani, Masoud, Aguilar-Bolados, Héctor, Yazdani-Pedram, Mehrdad, Cölfen, Helmut
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2019
MDPI
Subjects
Additives
amorphous calcium carbonate
Animal sciences
Aragonite
Biomolecules
Calcite
Calcium carbonate
Carbon
Crystallization
Experiments
Fluorescein
Fluorescence
gas diffusion crystallization
Gaseous diffusion
Intermediates
Itaconic acid
Mineralization
Multi wall carbon nanotubes
multiwalled carbon nanotubes
Nanomaterials
Nanotechnology
Nanotubes
NMR
Nuclear magnetic resonance
Nucleation
Oxidation
Polymers
prenucleation cluster
vaterite
Chile
United States > US
Germany
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Summary: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.
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ISSN:2079-4991
2079-4991
DOI:10.3390/nano9081169