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Precision control of drying using rhythmic dancing of sessile nanoparticle laden droplets

Sanyal, Apratim and Basu, Saptarshi and Chowdhuri, Subham and Kabi, Prasenjit and Chaudhuri, Swetaprovo (2014) Precision control of drying using rhythmic dancing of sessile nanoparticle laden droplets. In: APPLIED PHYSICS LETTERS, 104 (16).

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Official URL: http://dx.doi.org/10.1063/1.4873394


This work analyses the unique spatio-temporal alteration of the deposition pattern of evaporating nanoparticle laden droplets resting on a hydrophobic surface through targeted low frequency substrate vibrations. External excitation near the lowest resonant mode (n = 2) of the droplet initially de-pins and then subsequently re-pins the droplet edge creating pseudo-hydrophilicity (low contact angle). Vibration subsequently induces droplet shape oscillations (cyclic elongation and flattening) resulting in strong flow recirculation. This strong radially outward liquid flow augments nanoparticle transport, vaporization, and agglomeration near the pinned edge resulting in much reduced drying time under certain characteristic frequency of oscillations. The resultant deposit exhibits a much flatter structure with sharp, defined peripheral wedge topology as compared to natural drying. Such controlled manipulation of transport enables tailoring of structural and topological morphology of the deposits and offers possible routes towards controlling the formation and drying timescales which are crucial for applications ranging from pharmaceutics to surface patterning. (C) 2014 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the AMER INST PHYSICS, USA
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 11 Jun 2014 10:30
Last Modified: 11 Jun 2014 10:30
URI: http://eprints.iisc.ac.in/id/eprint/49176

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