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Science 28 January 2000:
Vol. 287. no. 5453, pp. 625 - 627
DOI: 10.1126/science.287.5453.625
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Reports

Single-File Diffusion of Colloids in One-Dimensional Channels

Q.-H. Wei, *dagger C. Bechinger, * P. Leiderer

Single-file diffusion, prevalent in many processes, refers to the restricted motion of interacting particles in narrow micropores with the mutual passage excluded. A single-filing system was developed by confining colloidal spheres in one-dimensional circular channels of micrometer scale. Optical video microscopy study shows evidence that the particle self-diffusion is non-Fickian for long periods of time. In particular, the distribution of particle displacement is a Gaussian function.

Faculty of Physics, University of Konstanz, Postfach M676, D-78457 Konstanz, Germany.
*   To whom correspondence should be addressed. E-mail: qwei+@pitt.edu (Q.-H.W.) and clemens.bechinger{at}uni-konstanz.de (C.B.)

dagger    Present address: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)