Droplet evaporation on soft solid substrates

Vasileios Charitatos, Satish Kumar

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Droplet evaporation on soft solid substrates is relevant to applications such as fabrication of microlenses and controlled particle deposition. Here, we develop a lubrication-theory-based model to advance fundamental understanding of the important limiting case of a planar droplet evaporating on a linear viscoelastic solid. A set of partial differential equations describing the time evolution of the liquid-air and liquid-solid interfaces is derived and solved with a finite-difference method. A disjoining-pressure/precursor-film approach is used to describe contact-line motion, and the one sided model is used to describe solvent evaporation. Parametric studies are conducted to investigate the effect of solid properties (thickness, viscosity, shear modulus, wettability) and evaporation rate on droplet dynamics. Our results indicate that softer substrates speed up droplet evaporation due to prolonged pinning of the contact line. Results from our model are able to qualitatively reproduce some key trends observed in experiments. Due to its systematic formulation, our model can readily be extended to more complex situations of interest such as evaporation of particle-laden droplets on soft solid substrates.

Original languageEnglish (US)
Pages (from-to)9339-9352
Number of pages14
JournalSoft Matter
Volume17
Issue number41
DOIs
StatePublished - Nov 7 2021

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2021.

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