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Tracking a colloidal particle for the measurement of dynamic entropies

Author

Listed:
  • Briggs, M.E
  • Sengers, J.V
  • Francis, M.K
  • Gaspard, P
  • Gammon, R.W
  • Dorfman, J.R
  • Calabrese, R.V

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.

Suggested Citation

  • Briggs, M.E & Sengers, J.V & Francis, M.K & Gaspard, P & Gammon, R.W & Dorfman, J.R & Calabrese, R.V, 2001. "Tracking a colloidal particle for the measurement of dynamic entropies," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 296(1), pages 42-59.
    • Handle: RePEc:eee:phsmap:v:296:y:2001:i:1:p:42-59
    DOI: 10.1016/S0378-4371(01)00160-1
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