Single-file diffusion of colloids in one-dimensional channels

We study the diffusive behavior of colloidal particles which are confined to one-dimensional channels generated by scanning optical tweezers. At long times t, the mean-square displacement is found to scale as t(1/2), which is expected for systems where single-file diffusion occurs. In addition, we e...

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Bibliographic Details
Published in:Physical review letters 2004-07, Vol.93 (2), p.026001.1-026001.4, Article 026001
Main Authors: LUTZ, Christoph, KOLLMANN, Markus, BECHINGER, Clemens
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
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Summary:We study the diffusive behavior of colloidal particles which are confined to one-dimensional channels generated by scanning optical tweezers. At long times t, the mean-square displacement is found to scale as t(1/2), which is expected for systems where single-file diffusion occurs. In addition, we experimentally obtain the long-time, self-diffusive behavior from the short-time collective density fluctuations of the system as suggested by a recent analytical approach [Phys. Rev. Lett. 90, 180602 (2003)].
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.93.026001