Patterns during Evaporative Crystallization of a Saline Droplet

Kumar, V and Dash, S (2022) Patterns during Evaporative Crystallization of a Saline Droplet. In: Langmuir, 38 (333). pp. 10265-10273.

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Abstract

In the present work, we investigate the influence of substrate wettability and crystal morphology on the evaporative crystallization of saline droplets. On a superhydrophilic substrate, the evaporative crystals formed during the drying of a saline droplet of aqueous potassium nitrate are observed to be long and needle-shaped, oriented along the substrate. The crystal deposits form a flower-shaped pattern when the initial contact angle of the droplet increases to â 72°. The orientation of the crystals along the triple contact line of the droplet controls the self-Amplifying creeping growth of the salt crystals that eventually determines the overall evaporative patterns. The crystals change from being needle-shaped to globular salt deposits as the volume of liquid available for crystallization reduces. We demonstrate that the arrangement of the crystal with respect to the substrate and the droplet-Air interface governs the rate of evaporation, growth, and morphology of the crystals.

Item Type:	Journal Article
Publication:	Langmuir
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Contact angle; Crystal orientation; Deposits; Drops; Morphology; Phase interfaces; Potash; Potassium Nitrate, Crystal morphologies; Droplet/air interface; Evaporative crystallization; Flower-shaped; Initial contact; Saline droplets; Salt crystals; Shaped pattern; Super-hydrophilic; Triple contact line, Needles
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	14 Sep 2022 09:52
Last Modified:	14 Sep 2022 09:52
URI:	https://eprints.iisc.ac.in/id/eprint/76449

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