Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-07-11
J. Phys.: Condens. Matter 20, 404224 (2008)
Physics
Condensed Matter
Soft Condensed Matter
19 pages, Proceedings of CODEFII (Bonn, March 31 - Apr 2, 2008), JPCM (to appear)
Scientific paper
10.1088/0953-8984/20/40/404224
We analyze the effective potential for nanoparticles trapped at a fluid interface within a simple model which incorporates surface and line tensions as well as a thermal average over interface fluctuations (capillary waves). For a single colloid, a reduced steepness of the potential well hindering movements out of the interface plane compared to rigid interface models is observed, and an instability of the capillary wave partition sum in case of negative line tensions is pointed out. For two colloids, averaging over the capillary waves leads to an effective Casimir--type interaction which is long--ranged, power-like in the inverse distance but whose power sensitively depends on possible restrictions of the colloid degress of freedom. A nonzero line tension leads to changes in the magnitude but not in the functional form of the effective potential asymptotics.
Lehle Hartwig
Oettel Martin
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