Single-File Diffusion of Colloids in One-Dimensional Channels

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Science  28 Jan 2000:
Vol. 287, Issue 5453, pp. 625-627
DOI: 10.1126/science.287.5453.625

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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.

  • * To whom correspondence should be addressed. E-mail: (Q.-H.W.) and clemens.bechinger{at} (C.B.)

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

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