par Briggs, Matthew;Sengers, J.V.;Francis, Michael;Gaspard, Pierre 
;Gammon, Robert;Dorfman, Jonathan Robert;Calabrese, R.V.
Référence Physica A: Statistical Mechanics and its Applications, 296, 1-2, page (42-59)
Publication Publié, 2001
;Gammon, Robert;Dorfman, Jonathan Robert;Calabrese, R.V.Référence Physica A: Statistical Mechanics and its Applications, 296, 1-2, page (42-59)
Publication Publié, 2001
Article révisé par les pairs
| Résumé : | 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. © 2001 Published by Elsevier Science B.V. |
