Influence of roughness on capillary forces between hydrophilic surfaces

P. J. van Zwol, G. Palasantzas*, J. Th. M. De Hosson

*Corresponding author for this work

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Abstract

Capillary forces have been measured by atomic force microscopy in the plate-sphere setup between gold, borosilicate glass, GeSbTe, titanium, and UV-irradiated amorphous titanium-dioxide surfaces. The force measurements were performed as a function contact time and surface roughness in the range 0.2-15 nm rms and relative humidity ranging between 2% and 40%. It is found that even for the lowest attainable relative humidity (similar to 2% +/- 1%) very large capillary forces are still present. The latter suggests the persistence of a nanometers-thick adsorbed water layer that acts as a capillary bridge between contacting surfaces. Moreover, we found a significantly different scaling behavior of the force with rms roughness for materials with different hydrophilicity as compared to gold-gold surfaces.

Original languageEnglish
Article number031606
Number of pages6
JournalPhysical Review E
Volume78
Issue number3
DOIs
Publication statusPublished - Sep-2008

Keywords

  • THIN-FILMS
  • WATER
  • ADHESION
  • EVAPORATION
  • THICKNESS
  • BRIDGES

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