Measurement of FLux Fluctuations in Diffusion in the Small-Numbers Limit

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dc.creatorSeitaridou, Effrosyni
dc.creatorInamdar, Mandar M.
dc.creatorPhillips, Rob
dc.creatorGhosh, Kingshuk
dc.creatorDill, Ken
dc.date2006-07-26
dc.date.accessioned2026-07-07T07:16:11Z
dc.date.available2026-07-07T07:16:11Z
dc.descriptionUsing a microfluidics device filled with a colloidal suspension of microspheres, we test the laws of diffusion in the limit of small particle numbers. Our focus is not just on average properties such as the mean flux, but rather on the features of the entire distribution of allowed microscopic trajectories that are possible during diffusive dynamics. The experiments show that: (1) the flux distribution is Gaussian; (2) Fick's Law --- that the average flux is proportional to the particle gradient --- holds even for particle gradients down to one or zero particles; (3) the variance in the flux is proportional to the sum of the particle numbers; and (4) there are backwards flows, where particles flow up a concentration gradient, rather than down it, and their numbers are well-predicted by theory and consistent with a new Flux Fluctuation Theorem.
dc.identifierhttps://arxiv.org/abs/cond-mat/0607698
dc.identifierhttp://arxiv.org/abs/cond-mat/0607698
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/113498
dc.subjectStatistical Mechanics
dc.subjectSoft Condensed Matter
dc.titleMeasurement of FLux Fluctuations in Diffusion in the Small-Numbers Limit
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