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Issue 35, 2015
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Growth kinetics of NaCl crystals in a drying drop of gelatin: transition from faceted to dendritic growth

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Abstract

We report a study on the kinetics of drying of a droplet of aqueous gelatin containing sodium chloride. The process of drying recorded as a video clearly shows different regimes of growth leading to a variety of crystalline patterns. Large faceted crystals of ∼mm size form in the early stages of evaporation, followed by highly branched multi-fractal patterns with micron sized features. We simulate the growth using a simple algorithm incorporating aggregation and evaporation, which reproduces the cross-over between the two growth regimes. As evaporation proceeds, voids form in the gel film. The time development of the fluid–void system can be characterized by the Euler number. A minimum in the Euler number marks the transition between the two regimes of growth.

Graphical abstract: Growth kinetics of NaCl crystals in a drying drop of gelatin: transition from faceted to dendritic growth

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Article information


Submitted
29 Mar 2015
Accepted
25 Jul 2015
First published
28 Jul 2015

Soft Matter, 2015,11, 6938-6947
Article type
Paper

Growth kinetics of NaCl crystals in a drying drop of gelatin: transition from faceted to dendritic growth

M. Dutta Choudhury, T. Dutta and S. Tarafdar, Soft Matter, 2015, 11, 6938
DOI: 10.1039/C5SM00742A

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