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Proceedings Paper

Three- and four-body interactions in colloidal systems
Author(s): Jure Dobnikar; Matthias Brunner; Jorg Baumgartl; Clemens Bechinger; Hans-Hennig von Gruenberg
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Paper Abstract

Three-body and four-body interactions have been directly measured in a colloidal system comprised of three (or four) 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. By means of an additional focused optical trap a third particle has been approached and attractive three-body interactions have been observed. These observations are in qualitative agreement with additionally performed nonlinear Poissson-Boltzmann calculations. Two configurations of four particles have been studied experimentally as well and in both cases a repulsive four-body interaction term has been observed.

Paper Details

Date Published: 18 October 2004
PDF: 12 pages
Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); doi: 10.1117/12.554610
Show Author Affiliations
Jure Dobnikar, Univ. Graz (Austria)
Jozef Stefan Institute (Slovenia)
Matthias Brunner, Univ. Stuttgart (Germany)
Jorg Baumgartl, Univ. Stuttgart (Germany)
Clemens Bechinger, Univ. Stuttgart (Germany)
Hans-Hennig von Gruenberg, Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 5514:
Optical Trapping and Optical Micromanipulation
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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