Direct Observation of Nondiffusive Motion of a Brownian Particle

by: B Lukic, S Jeney, C Tischer, AJ Kulik, L Forro, EL Florin

Physical Review Letters, Vol. 95, No. 16. (2005)

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Abstract

The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We find, in accord with the theory of Brownian motion including hydrodynamic memory effects, that the transition from ballistic to diffusive motion is delayed to significantly longer times than predicted by the standard Langevin equation. This delay is a consequence of the inertia of the fluid. On the shortest time scales investigated, the sphere's inertia has a small, but measurable, effect.

@article{citeulike:1378517, abstract = {The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We find, in accord with the theory of Brownian motion including hydrodynamic memory effects, that the transition from ballistic to diffusive motion is delayed to significantly longer times than predicted by the standard Langevin equation. This delay is a consequence of the inertia of the fluid. On the shortest time scales investigated, the sphere's inertia has a small, but measurable, effect.}, author = {Lukic, B. and Jeney, S. and Tischer, C. and Kulik, A. J. and Forro, L. and Florin, E. L. }, citeulike-article-id = {1378517}, doi = {10.1103/PhysRevLett.95.160601}, journal = {Physical Review Letters}, keywords = {brownian, experiment}, number = {16}, posted-at = {2007-12-05 05:22:42}, priority = {2}, publisher = {APS}, title = {Direct Observation of Nondiffusive Motion of a Brownian Particle}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000095000016160601000001\&idtype=cvips\&gifs=yes}, volume = {95}, year = {2005} }

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TY - JOUR ID - citeulike:1378517 L3 - citeulike-article-id:1378517 TI - Direct Observation of Nondiffusive Motion of a Brownian Particle JF - Physical Review Letters VL - 95 IS - 16 PB - APS N2 - The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We find, in accord with the theory of Brownian motion including hydrodynamic memory effects, that the transition from ballistic to diffusive motion is delayed to significantly longer times than predicted by the standard Langevin equation. This delay is a consequence of the inertia of the fluid. On the shortest time scales investigated, the sphere's inertia has a small, but measurable, effect. KW - brownian KW - experiment AU - Lukic, B AU - Jeney, S AU - Tischer, C AU - Kulik, AJ AU - Forro, L AU - Florin, EL PY - 2005/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000095000016160601000001&idtype=cvips&gifs=yes ER -

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