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

Langmuir : the ACS Journal of Surfaces and Colloids
Angkur Jyoti Dipanka Shaikeea, Saptarshi Basu

Abstract

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.

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Citations

Dec 13, 2019·Soft Matter·Saurabh NathJonathan B Boreyko
Aug 11, 2017·Scientific Reports·Lalit BansalSuman Chakraborty
May 20, 2020·Physical Review. E·Khushboo PandeySaptarshi Basu
Feb 13, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Melike Begum Tanis-KanburFei Duan
Jan 16, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Purbarun DharVivek Jaiswal
Jan 19, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Prasenjit KabiSaptarshi Basu
Jan 29, 2020·The Journal of Physical Chemistry. B·Nandita Basu, Rabibrata Mukherjee
Mar 22, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Tapan Kumar Pradhan, Pradipta Kumar Panigrahi
Feb 23, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Lalit BansalSaptarshi Basu
Feb 19, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Pranav ShuklaJonathan B Boreyko

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