Skip to Main content Skip to Navigation
Journal articles

Sessile drops in weightlessness: an ideal playground for challenging Young's equation

Abstract : Sessile drop creation in weightlessness is critical for designing scientific instruments for space applications and for manipulating organic or biological liquids, such as whole human blood or DNA drops. It requires perfect control of injection, spreading, and wetting; however, the simple act of creating a drop on a substrate is more complex than it appears. A new macroscopic model is derived to better understand this related behavior. We find that, for a given set of substrate, liquid, and surrounding gas properties, when the ratio of surface free energies to contact line free energy is on the macroscopic scale, the macroscopic contact angle can vary at static equilibrium over a broad volume range. It can increase or decrease against volume depending on the sign of this ratio up to an asymptotic value. Consequently, our model aims to explore configurations that challenge the faithful representativity of the classical Young's equation and extends the present understanding of wetting.
Complete list of metadata

https://hal-amu.archives-ouvertes.fr/hal-03218923
Contributor : Marc Medale Connect in order to contact the contributor
Submitted on : Thursday, May 6, 2021 - 8:49:26 AM
Last modification on : Monday, September 20, 2021 - 3:34:11 PM
Long-term archiving on: : Saturday, August 7, 2021 - 6:19:48 PM

File

Medale_Brutin_NPJ_Microgravity...
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Marc Medale, David Brutin. Sessile drops in weightlessness: an ideal playground for challenging Young's equation. npj Microgravity, 2021, 7, pp.30. ⟨10.1038/s41526-021-00153-9⟩. ⟨hal-03218923⟩

Share

Metrics

Record views

110

Files downloads

27