Volume 54, Number 1, April 2001
|Page(s)||28 - 34|
|Published online||01 December 2003|
Drift without flux: Brownian walker with a space-dependent diffusion coefficient
Laboratoire de Physique de La Matière
Condensée (CNRS UMR 6622) Université de Nice
Sophia-Antipolis - Parc Valrose, 06108 Nice Cedex, France
2 Institut Non Linéaire de Nice (CNRS UMR 6618), Université de Nice Sophia-Antipolis - 1361 Route des Lucioles, 06560 Sophia Antipolis, France
Accepted: 19 January 2001
Space-dependent diffusion of micrometer-sized particles has been directly observed using digital video microscopy. The particles were trapped between two nearly parallel walls making their confinement position dependent. Consequently, not only did we measure a diffusion coefficient which depended on the particles' position, but also report and explain a new effect: a drift of the particles' individual positions in the direction of the diffusion coefficient gradient, in the absence of any external force or concentration gradient.
PACS: 05.40.Jc – Brownian motion / 82.70.Dd – Colloids / 67.40.Hf – Hydrodynamics in specific geometries, flow in narrow channels
© EDP Sciences, 2001
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