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Article

In Situ Observation of Epitaxial Growth during Evaporative Simultaneous Crystallization from Aqueous Electrolytes in Droplets

1
Division of Resource Recovery, Department of Chemical Engineering, KTH Royal Institute of Technology, 114 28 Stockholm, Sweden
2
Department of Chemical Engineering, Polytechnic School, University of São Paulo, São Paulo 3550308, Brazil
3
Geosciences Institute, University of São Paulo, São Paulo 3550308, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Borislav Angelov
Crystals 2021, 11(9), 1122; https://doi.org/10.3390/cryst11091122
Received: 18 August 2021 / Revised: 3 September 2021 / Accepted: 10 September 2021 / Published: 15 September 2021
In this study, crystallization phenomena were investigated by real-time in situ observation of seeded droplets under evaporation using a self-developed hot-stage platform. Ternary solutions at eutonic conditions at 25 °C were investigated for the following systems: NaCl–KCl–H2O, NaCl–CaSO4–H2O, and NaCl–Na2SO4–H2O. Evidence of epitaxial growth was found for aqueous NaCl–KCl and aqueous NaCl–Na2SO4. Sodium chloride nucleated and grew epitaxially upon the other substrates in a larger proportion compared with the inverse. This observation could be related to the higher solubility, and consequently higher residual supersaturation of NaCl regarding the other components. Hopper-like NaCl crystals developed in almost all systems. The results may help devise strategies to control particle morphologies and purity in industrial crystallization from complex systems. View Full-Text
Keywords: simultaneous crystallization; epitaxial particles; real-time monitoring; crystallization from ternary solutions simultaneous crystallization; epitaxial particles; real-time monitoring; crystallization from ternary solutions
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MDPI and ACS Style

Penha, F.M.; Andrade, F.R.D.; Lanzotti, A.S.; Moreira Junior, P.F.; Zago, G.P.; Seckler, M.M. In Situ Observation of Epitaxial Growth during Evaporative Simultaneous Crystallization from Aqueous Electrolytes in Droplets. Crystals 2021, 11, 1122. https://doi.org/10.3390/cryst11091122

AMA Style

Penha FM, Andrade FRD, Lanzotti AS, Moreira Junior PF, Zago GP, Seckler MM. In Situ Observation of Epitaxial Growth during Evaporative Simultaneous Crystallization from Aqueous Electrolytes in Droplets. Crystals. 2021; 11(9):1122. https://doi.org/10.3390/cryst11091122

Chicago/Turabian Style

Penha, Frederico M., Fábio R.D. Andrade, Amanda S. Lanzotti, Paulo F. Moreira Junior, Gustavo P. Zago, and Marcelo M. Seckler 2021. "In Situ Observation of Epitaxial Growth during Evaporative Simultaneous Crystallization from Aqueous Electrolytes in Droplets" Crystals 11, no. 9: 1122. https://doi.org/10.3390/cryst11091122

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