Three- and four-body interactions in colloidal systems

Jure Dobnikar; Matthias Brunner; Jorg Baumgartl; Clemens Bechinger; Hans-Hennig von Gruenberg

doi:10.1117/12.554610

18 October 2004 Three- and four-body interactions in colloidal systems

Jure Dobnikar, Matthias Brunner, Jorg Baumgartl, Clemens Bechinger, Hans-Hennig von Gruenberg

Proceedings Volume 5514, Optical Trapping and Optical Micromanipulation; (2004) https://doi.org/10.1117/12.554610
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Jure Dobnikar, Matthias Brunner, Jorg Baumgartl, Clemens Bechinger, and Hans-Hennig von Gruenberg "Three- and four-body interactions in colloidal systems", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); https://doi.org/10.1117/12.554610

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