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 a...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2021-08-01
|
| Series: | npj Microgravity |
| Online Access: | https://doi.org/10.1038/s41526-021-00153-9 |
| _version_ | 1797641252061052928 |
|---|---|
| author | Marc Medale David Brutin |
| author_facet | Marc Medale David Brutin |
| author_sort | Marc Medale |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T13:43:13Z |
| format | Article |
| id | doaj.art-521943ff83ae440f907d5b807871aa95 |
| institution | Directory Open Access Journal |
| issn | 2373-8065 |
| language | English |
| last_indexed | 2024-03-11T13:43:13Z |
| publishDate | 2021-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Microgravity |
| spelling | doaj.art-521943ff83ae440f907d5b807871aa952023-11-02T11:19:34ZengNature Portfolionpj Microgravity2373-80652021-08-01711910.1038/s41526-021-00153-9Sessile drops in weightlessness: an ideal playground for challenging Young’s equationMarc Medale0David Brutin1Aix Marseille Université, CNRS, IUSTIAix Marseille Université, CNRS, IUSTIAbstract 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.https://doi.org/10.1038/s41526-021-00153-9 |
| spellingShingle | Marc Medale David Brutin Sessile drops in weightlessness: an ideal playground for challenging Young’s equation npj Microgravity |
| title | Sessile drops in weightlessness: an ideal playground for challenging Young’s equation |
| title_full | Sessile drops in weightlessness: an ideal playground for challenging Young’s equation |
| title_fullStr | Sessile drops in weightlessness: an ideal playground for challenging Young’s equation |
| title_full_unstemmed | Sessile drops in weightlessness: an ideal playground for challenging Young’s equation |
| title_short | Sessile drops in weightlessness: an ideal playground for challenging Young’s equation |
| title_sort | sessile drops in weightlessness an ideal playground for challenging young s equation |
| url | https://doi.org/10.1038/s41526-021-00153-9 |
| work_keys_str_mv | AT marcmedale sessiledropsinweightlessnessanidealplaygroundforchallengingyoungsequation AT davidbrutin sessiledropsinweightlessnessanidealplaygroundforchallengingyoungsequation |