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When marbles challenge pearls
Panlin Jin1, Kexin Zhao1, Zoé Blin1
1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, ESPCI, 75005 Paris, France.
The Journal of Chemical Physics
|May 26, 2023
Summary
Non-wetting drops exhibit extreme mobility due to surface texture. Researchers observed that roughening solids creates "pearls," while powder-texturing liquids forms "marbles," with pearls generally moving faster than marbles.
Area of Science:
- Physics
- Materials Science
- Surface Science
Background:
- Non-wetting drops display remarkable mobility, a property historically observed in substances like quicksilver.
- Achieving non-wetting behavior in water typically involves surface texturing techniques.
Purpose of the Study:
- To investigate the distinct behaviors of two types of non-wetting liquid formations: 'pearls' and 'marbles'.
- To analyze the differences in static adhesion and dynamic mobility between these textured liquid forms.
Main Methods:
- Creating 'pearls' by texturing hydrophobic solid surfaces.
- Forming 'marbles' by applying hydrophobic powder to liquid drops, isolating them from the substrate.
- Conducting comparative studies on the static adhesion and mobility of pearls and marbles.
Main Results:
- Observed differences in the nature of static adhesion for pearls and marbles, attributed to substrate interaction.
- Found that pearls generally exhibit higher mobility than marbles.
- Hypothesized that differences in the liquid/air interface contribute to mobility disparities.
Conclusions:
- Surface texture plays a crucial role in the mobility and adhesion of non-wetting liquid formations.
- The method of creating non-wetting structures (roughened solids vs. powder-coated liquids) significantly impacts their physical properties.
- Further research into the liquid/air interface is warranted to fully understand mobility differences.
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