Journal ArticleDOI
Influence of supersaturation on the kinetics of crystallisation of ZnC2O4 · 2H2O
E. Kirkova,M. Djarova +1 more
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TLDR
The specific surface energy at the crystal-solution interface was calculated from the induction period and the Volmer relationship, while the critical nuclei dimension was found by means of the Thomson-Gibbs equation as mentioned in this paper.Abstract:
The kinetics of crystallisation of ZnC2O4 · 2 H2O was investigated at 25°C and at different supersaturations. Zinc oxalate was prepared from pure zinc sulphate and oxalic acid solutions. The specific surface energy at the crystal-solution interface was calculated from the induction period and the Volmer relationship, while the critical nuclei dimension was found by means of the Thomson-Gibbs equation. With the decrease in supersaturation the size of the nuclei does not increase to infinity, but changes by 1–2 unit cells within a given supersaturation range.
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Citations
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Interpretation of crystallization induction periods
Otakar Sohnel,John W. Mullin +1 more
TL;DR: In this article, the authors derived expressions describing the dependence of the crystallization induction period tind on supersaturation for different possible nucleation and growth mechanisms, and their validity is assessed on the basis of experimental evidence.
Journal ArticleDOI
An improved predictive correlation for the induction time of CaCO3 scale formation during flow in porous media
TL;DR: The induction time, tind, of calcium carbonate precipitation in porous rocks was experimentally measured under dynamic conditions with the use of a radiotracer technique, where the gamma-emitting nuclide 47Ca was used as a tracer in order to monitor the scale deposition at real time.
Journal ArticleDOI
Crystal structure and thermal characterization of cadmium oxalate [CdC2O4 · 3H2O] and barium-doped cadmium oxalate [Ba0.5Cd0.5(C2O4)2 · 5H2O] single crystals grown in silica gel
TL;DR: In this article, the effect of barium dopant on the growth and morphology of cadmium oxalate was studied by X-ray diffraction, Fourier transform infrared spectroscopy and thermal analysis.
Journal ArticleDOI
Growth and Characterization of Pure and Magnesium Doped Copper Cadmium Oxalate Single Crystals
TL;DR: In this article, single crystals of Pure (CCO) and Magnesium Doped Copper Cadmium Oxalate (MDCCO), having size of 0.30×0.10 were grown by the single-diffusion reaction method in the silica gel medium at 23°C temperature.
Journal ArticleDOI
Statistik des Anfangstadiums der Bildung von Kristallisationszentren in Schmelzen und Lösungen
TL;DR: In this article, a theoretische analysis of the Verteilungsfunktion der Induktionszeit bis zum Auftreten des ersten Kristallisationszentrums bei der homogenen and heterogenen Keimbildung in unterkuhlten Schmelzen und ubersattigten Losungen is presented.
References
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Journal ArticleDOI
Kinetics of Phase Change. I General Theory
TL;DR: In this paper, the theory of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered by previous treatment.
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Kinetics of Phase Change. II Transformation‐Time Relations for Random Distribution of Nuclei
TL;DR: In this article, a relation between the actual transformed volume V and a related extended volume V1 ex is derived upon statistical considerations, and a rough approximation to this relation is shown to lead, under the proper conditions, to the empirical formula of Austin and Rickett.
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Nucleation and the interfacial tension of sparingly soluble salts
TL;DR: In this paper, critical supersaturations required for homogeneous nucleation of sparingly soluble salts from solution have been determined by nephelometry, in conjunction with nucleation theory, to calculate values for the interfacial tension and radius of the critical nucleus.