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Proceedings Paper

Exploiting the color of Brownian motion for high-frequency microrheology of Newtonian fluids
Author(s): Pablo Domínguez-García; Flavio M. Mor; László Forró; Sylvia Jeney
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Paper Abstract

Einstein’s stochastic description of the random movement of small objects in a fluid, i.e. Brownian motion, reveals to be quite different, when observed on short timescales. The limitations of Einstein’s theory with respect to particle inertia and hydrodynamic memory yield to the apparition of a colored frequency-dependent component in the spectrum of the thermal forces, which is called “the color of Brownian motion”. The knowledge of the characteristic timescales of the motion of a trapped microsphere motion in a Newtonian fluid allowed to develop a high-resolution calibration method for optical interferometry. Well-calibrated correlation quantities, such as the mean square displacement or the velocity autocorrelation function, permit to study the mechanical properties of fluids at high frequencies. These properties are estimated by microrheological calculations based on the theoretical relations between the complex mobility of the beads and the rheological properties of a complex fluid.

Paper Details

Date Published: 12 September 2013
PDF: 6 pages
Proc. SPIE 8810, Optical Trapping and Optical Micromanipulation X, 881015 (12 September 2013); doi: 10.1117/12.2024849
Show Author Affiliations
Pablo Domínguez-García, Univ. Nacional de Educación a Distancia (Spain)
Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Flavio M. Mor, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
László Forró, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Sylvia Jeney, Ecole Polytechnique Fédérale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 8810:
Optical Trapping and Optical Micromanipulation X
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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