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Determination of Crystal Growth Rates in Multi-Component Solutions

Helfenritter, Christoph ORCID iD icon 1; Kind, Matthias 1
1 Institut für Thermische Verfahrenstechnik (TVT), Karlsruher Institut für Technologie (KIT)

Abstract:

Many solid forming processes involve crystallization from multi-component solutions. In order to predict final phase assemblages, multi-component phase transfer kinetics must be known. It is not sufficient to have the kinetics of only one crystallizing component in the presence of other entities; the kinetics of concurrent crystallizing components are of interest as well. However, methods for their determination are currently lacking. We propose a new method comprising desupersaturation measurements of a 150 µm film of supersaturated solution in contact with a planar crystalline substrate. We show that concentration measurement at a single point in the film is sufficient to retrieve the phase transfer kinetics. For this, we use a confocal micro-Raman spectroscope, which is able to distinguish between different components and has a high spatial resolution. We chose crystallization of $Na_2SO_4$ and $Na_2CO_3$ decahydrate from aqueous solution as our model system because of its well-known phase equilibrium. In binary experiments, we demonstrate the mode of operation and its ability to reproduce known kinetics from the literature. In ternary experiments, we successfully distinguish two courses of crystallization, the first of which is a preferential crystallization of one component and the second a simultaneous crystallization of both crystallizing components. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000153271
Veröffentlicht am 02.12.2022
Originalveröffentlichung
DOI: 10.3390/cryst12111568
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2073-4352
KITopen-ID: 1000153271
Erschienen in Crystals
Verlag MDPI
Band 12
Heft 11
Seiten Art.-Nr.: 1568
Vorab online veröffentlicht am 03.11.2022
Schlagwörter desupersaturation, multi-component, crystal growth, electrolytes, confocal Raman spectroscopy
Nachgewiesen in Dimensions
Web of Science
Scopus
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