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Insight into the Evaporation Dynamics of a Pair of Sessile Droplets on a Hydrophobic Substrate

Shaikeea, Angkur Jyoti Dipanka and Basu, Saptarshi (2016) Insight into the Evaporation Dynamics of a Pair of Sessile Droplets on a Hydrophobic Substrate. In: LANGMUIR, 32 (5). pp. 1309-1318.

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Official URL: http://dx.doi.org/10.1021/acs.langmuir.5b04570


In this work, we have demonstrated three unique regimes in the evaporation lifecycle of a pair of sessile droplets placed in variable proximity on a hydrophobic substrate. For small separation distance, the droplets undergo asymmetric spatiotemporal,evaporation leading to contact angle hysteresis and suppressed vaporization. The reduced evaporation has been attributed quantitatively to the existence of a constrained vapor-rich dome between the two droplets. However, a dynamic decrease in the droplet radius due to solvent removal marks a return to symmetry in terms of evaporation and contact angle. We have described the variation in evaporation flux using a universal correction factor. We have also demonstrated the existence of a critical separation distance beyond which the droplets in the, droplet pair do not affect each other. The results are crucial to a plethora of applications ranging from surface patterning to lab-on-a-chip devices.

Item Type: Journal Article
Publication: LANGMUIR
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 02 Apr 2016 11:27
Last Modified: 02 Apr 2016 11:27
URI: http://eprints.iisc.ac.in/id/eprint/53474

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