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Salt stains from evaporating droplets

Shahidzadeh-Bonn, Noushine and Schut, Marthe F.L. and Desarnaud, Julie and Prat, Marc and Bonn, Daniel Salt stains from evaporating droplets. (2015) Scientific Reports, 5 (10335). 1-9. ISSN 2045-2322

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Official URL: http://dx.doi.org/10.1038/srep10335

Abstract

The study of the behavior of sessile droplets on solid substrates is not only associated with common everyday phenomena, such as the coffee stain effect, limescale deposits on our bathroom walls , but also very important in many applications such as purification of pharmaceuticals, de-icing of airplanes, inkjet printing and coating applications. In many of these processes, a phase change happens within the drop because of solvent evaporation, temperature changes or chemical reactions, which consequently lead to liquid to solid transitions in the droplets. Here we show that crystallization patterns of evaporating of water drops containing dissolved salts are different from the stains reported for evaporating colloidal suspensions. This happens because during the solvent evaporation, the salts crystallize and grow during the drying. Our results show that the patterns of the resulting salt crystal stains are mainly governed by wetting properties of the emerging crystal as well as the pathway of nucleation and growth, and are independent of the evaporation rate and thermal conductivity of the substrates.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group. The definitive version is available at http://www.nature.com/ The original PDF of the article can be found at http://www.nature.com/articles/srep10335#abstract
HAL Id:hal-01429897
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Amsterdam - UvA (NETHERLANDS)
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Deposited On:09 Jan 2017 10:52

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