"Longterm effects of inertia on a Browian particle studied by optical tweezers"

Longterm effects of inertia on a Browian particle studied by optical tweezers

Giuseppe Pesce (a), Giorgio Volpe (b), Antonio Sasso (a), Giovanni Volpe(c)
(a) Univ. degli Studi di Napoli Federico II (Italy)
(b) Institut Langevin (France)
(c) Bilkent University (Turkey)


The effects of the inertia on a Brownian particle diffusing in a fluid are usually considered negligible.
Only at very small times, i.e. times of the order of magnitude of the ratio m/gamma, deviations from
the Einstein-Smoluchowsky law have been recently reported taking into accounts also the effects of
the fluid displacement. Using blinking optical tweezers and fast video microscopy we show that
these effects are measurable even at long times, up to few tenths of seconds. In particular the
deviation from the Einstein-Smoluchowsky law increases with the time.

Place: Conference 8810, Optical Trapping and Optical Micromanipulation X
25 - 29 August 2013
San Diego, CA, USA