Volume 69, Number 3, February 2005
|Page(s)||468 - 474|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||24 December 2004|
Three-body forces at work: Three-body potentials derived from triplet correlations in colloidal suspensions
Universität Konstanz, Fachbereich Physik - D-78457 Konstanz, Germany
2 Universität Stuttgart, 2. Physikalisches Institut - D-70550 Stuttgart, Germany
3 Karl-Franzens Universität Graz, Institut für Chemie - A-8010 Graz, Austria
Accepted: 12 November 2004
Two- and three-particle correlation functions are computed from video-microscopy data of two-dimensional suspensions of charged colloids and inverted to derive the pair and three-body interaction potentials between the colloidal particles. Our method allows to resolve the full spatial dependence of the three-body potentials. Examining colloidal systems at different colloid densities, we find density-independent, attractive three-body potentials, with a minimum of a few kT that is most pronounced in the equilateral triangle configuration.
PACS: 82.70.Dd – Colloids / 82.70.-y – Disperse systems; complex fluids / 05.20.Jj – Statistical mechanics of classical fluids
© EDP Sciences, 2005
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