Tracking a colloidal particle for the measurement of dynamic entropies

M.e Briggs, J.v Sengers, M.k Francis, P Gaspard, R.w Gammon, J.r Dorfman and R.v Calabrese

Physica A: Statistical Mechanics and its Applications, 2001, vol. 296, issue 1, 42-59

Abstract: The paper describes the apparatus and measurement procedure for tracking long time trajectories of a single colloidal particle undergoing Brownian motion in water. The bulk motion obeys the Einstein–Stokes formulation, while sedimented motion is slowed by an additional drag known as the wall-drag effect. The sedimented particle trajectory is long enough to show diffusive motion spanning four decades in time. We describe the sample preparation, tracking routine, data-acquisition and noise. The experiment shows that Brownian motion exhibits a positive dynamic entropy consistent with microscopic chaos. The theoretical relevance of the experimental results is discussed.

Date: 2001
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:296:y:2001:i:1:p:42-59

DOI: 10.1016/S0378-4371(01)00160-1

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