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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.

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Summary
This summary is machine-generated.

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.

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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.