Three-body interactions in colloidal systems

Jure Dobnikar, Matthias Brunner, Hans-Hennig von Grünberg, and Clemens Bechinger
Phys. Rev. E 69, 031402 – Published 10 March 2004
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Abstract

We present a direct measurement of three-body interactions in a colloidal system comprised of three charged colloidal particles. Two of the particles have been confined by means of a scanned laser tweezers to a line-shaped optical trap where they diffused due to thermal fluctuations. Upon the approach of a third particle, attractive three-body interactions have been observed. The results are in qualitative agreement with additionally performed nonlinear Poisson-Boltzmann calculations, which also allow us to investigate the microionic density distributions in the neighborhood of the interacting colloidal particles.

  • Received 13 August 2003

DOI:https://doi.org/10.1103/PhysRevE.69.031402

©2004 American Physical Society

Authors & Affiliations

Jure Dobnikar, Matthias Brunner, and Hans-Hennig von Grünberg*

  • Physics Department, University of Konstanz, 78457 Konstanz, Germany

Clemens Bechinger

  • University of Stuttgart, 2. Physikalisches Institut, 70550 Stuttgart, Germany

  • *Electronic address: jure.dobnikar@uni-konstanz.de

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Vol. 69, Iss. 3 — March 2004

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