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Capillary-force measurement on SiC surfaces.

M Sedighi1,2, V B Svetovoy3,4, G Palasantzas1

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Summary
This summary is machine-generated.

Capillary forces between spheres significantly decrease with increased surface roughness due to multiple menisci formation. Smoother surfaces show stable capillary forces, reaching equilibrium quickly.

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Area of Science:

  • Surface Science and Tribology
  • Materials Science
  • Nanotechnology

Background:

  • Capillary forces play a crucial role in adhesion and friction at the micro- and nanoscale.
  • Understanding these forces is essential for applications involving particle assembly, MEMS, and biological systems.
  • Surface roughness and humidity are known to influence capillary interactions.

Purpose of the Study:

  • To quantitatively measure capillary forces using atomic force microscopy (AFM) in a controlled environment.
  • To investigate the impact of surface roughness, relative humidity, applied load, and contact time on capillary forces.
  • To elucidate the relationship between surface morphology and capillary meniscus formation.

Main Methods:

  • Atomic force microscopy (AFM) in sphere-plate geometry.
  • Controlled humidity environment (0%-40% RH).
  • Measurements on silicon carbide and borosilicate glass spheres with varying rms surface roughness (4-14 nm).

Main Results:

  • Pull-off force decreased by two orders of magnitude as rms roughness increased from 8 to 14 nm.
  • For roughness <8 nm, pull-off force remained constant, indicating a single meniscus.
  • Capillary force reached steady state within 5 seconds at 40% RH for smooth surfaces.
  • Pull-off force initially increased with applied load (plastic deformation) then decreased at higher loads.

Conclusions:

  • Surface roughness significantly alters capillary force behavior by controlling meniscus formation.
  • The transition from a single to multiple menisci dramatically reduces adhesion.
  • Applied load influences capillary forces through plastic deformation of surface asperities.