Journal
EUROPHYSICS LETTERS
Volume 75, Issue 1, Pages 174-180Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2006-10065-1
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We calculate the effective force mediated by thermally excited capillary waves between spherical or disklike colloids trapped at a fluid interface. This Casimir type interaction is shown to depend sensitively on the boundary conditions imposed at the three-phase contact line. For large distances between the colloids an unexpected cancellation of attractive and repulsive contributions is observed leading to a fluctuation force which decays algebraically very rapidly. For small separations the resulting force is rather strong and it may play an important role in two-dimensional colloid aggregation if direct van der Waals forces are weak.
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