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Article

Role of Hydrodynamics, Li+ Addition and Transformation Kinetics on the Formation of Plate-Like {001} Calcite Crystals

1
Laboratory for Precipitation Processes, Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
2
Dipartimento di Chimica “Giacomo Ciamician”, Alma Mater Studiorum—Universitá di Bologna, via Selmi 2, 40126 Bologna, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Sławomir J. Grabowski
Crystals 2021, 11(3), 250; https://doi.org/10.3390/cryst11030250
Received: 8 February 2021 / Revised: 22 February 2021 / Accepted: 24 February 2021 / Published: 28 February 2021
(This article belongs to the Special Issue Crystal Nucleation and Growth Kinetics)
Plate-like calcite crystals with expressed unstable {001} planes are interesting research model for investigations of interfacial interactions of different additive molecules, but also the crystal growth mechanisms. The aim of this study is to reproducibly prepare a significant amount of well-defined plate-like calcite crystals and to investigate the critical experimental parameters. Thus, in precipitation system c(NaHCO3) = c(CaCl2) = 0.1 mol dm−3, the influence of hydrodynamic parameters (mode of mixing of the reaction components) and a presence of lithium ions Li+ within a wide range of concentrations, 0.0 mol dm−3 < c(Li+) < 1.0 mol dm−3, have been studied. In addition, the kinetics of the solution mediated transformation of the initially formed metastable polymorph, vaterite, were followed in order to reproducibly describe the formation of stable calcite with expressed unstable morphology. The results indicate that the plate-like calcite is formed predominantly when the ultrasound irradiation is applied at c(Li+) ≥ 0.3 mol dm−3. On the other hand, when the magnetic and mechanical stirring are applied at higher Li+ concentrations, truncated rhombohedral crystals in a mixture with plate-like crystals are obtained. It was also found that the Li+ addition significantly prolonged the transformation, mainly by inhibiting the crystal growth of calcite. View Full-Text
Keywords: {001} plane; calcite; lithium ions; kinetic of transformation; stirring effect; calcite formation {001} plane; calcite; lithium ions; kinetic of transformation; stirring effect; calcite formation
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MDPI and ACS Style

Matijaković Mlinarić, N.; Kontrec, J.; Njegić Džakula, B.; Falini, G.; Kralj, D. Role of Hydrodynamics, Li+ Addition and Transformation Kinetics on the Formation of Plate-Like {001} Calcite Crystals. Crystals 2021, 11, 250. https://doi.org/10.3390/cryst11030250

AMA Style

Matijaković Mlinarić N, Kontrec J, Njegić Džakula B, Falini G, Kralj D. Role of Hydrodynamics, Li+ Addition and Transformation Kinetics on the Formation of Plate-Like {001} Calcite Crystals. Crystals. 2021; 11(3):250. https://doi.org/10.3390/cryst11030250

Chicago/Turabian Style

Matijaković Mlinarić, Nives, Jasminka Kontrec, Branka Njegić Džakula, Giuseppe Falini, and Damir Kralj. 2021. "Role of Hydrodynamics, Li+ Addition and Transformation Kinetics on the Formation of Plate-Like {001} Calcite Crystals" Crystals 11, no. 3: 250. https://doi.org/10.3390/cryst11030250

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