Influence of random roughness on the adhesion between metal surfaces due to capillary condensation
arXiv:0708.2264 · doi:10.1063/1.2768919
Abstract
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.
8 pages, 3 figures, To appear in Appl. Phys. Lett. (2007)
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