Influence of random roughness on the adhesion between metal surfaces due to capillary condensation

Details Influence of random roughness on the adhesion between metal surfaces due to capillary condensation Influence of random roughness on the adhesion between metal surfaces due to capillary condensation

2007-08-16

arxiv.org/abs/0708.2264v1

Physics

Condensed Matter

Materials Science

8 pages, 3 figures, To appear in Appl. Phys. Lett. (2007)

Scientific paper

10.1063/1.2768919

The capillary force was measured by atomic force microscopy between a gold coated sphere mounted on a cantilever and gold surfaces with different roughness. For smooth surfaces the capillary adhesive force surpasses in magnitude any dispersion, e.g. van der Waals/Casimir, and/or electrostatic forces. A substantial decrease in the capillary force was observed by increasing the roughness ampltitude a few nanometers between 1-10 nm. From these measurements two limits can be defined: a smooth limit where a closely macroscopic size contact surface interacts through the capillary force, and the rough limit where only a few asperities give a capillary contribution.

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