Publikation: Density-dependent pair interactions in 2D colloidal suspensions
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We experimentally determine effective interparticle potentials in a two-dimensional (2D) colloidal system of charge-stabilized polystyrene particles at different particle densities ρ. Density variation is achieved by means of a scanned optical laser tweezer which serves to create a boundary box for the system. By changing the size of this boundary box, ρ can be systematically varied without having to prepare a new system. From the measured radial distribution functions we can then obtain the effective pair potentials of the particles. While for low particle densities perfect agreement with Yukawa-like potentials is observed, considerable deviations from this form are found at higher densities. We interpret this result as a many-body effect produced by macroion screening which is expected to become more pronounced as the density is increased.
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BRUNNER, Matthias, Clemens BECHINGER, Wolfram STREPP, Vladimir LOBASKIN, Hans Hennig VON GRÜNBERG, 2002. Density-dependent pair interactions in 2D colloidal suspensions. In: Europhysics Letters (EPL). 2002, 58(6), pp. 926-965. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/epl/i2002-00105-4BibTex
@article{Brunner2002Densi-39436, year={2002}, doi={10.1209/epl/i2002-00105-4}, title={Density-dependent pair interactions in 2D colloidal suspensions}, number={6}, volume={58}, issn={0295-5075}, journal={Europhysics Letters (EPL)}, pages={926--965}, author={Brunner, Matthias and Bechinger, Clemens and Strepp, Wolfram and Lobaskin, Vladimir and von Grünberg, Hans Hennig} }
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