Direct Observation of Hydrodynamic Rotation-Translation Coupling between Two Colloidal Spheres | Zendy

S. Garcı́a Martı́n | Zendy; Michael Reichert | Zendy; Holger Stark | Zendy; Thomas Gisler | Zendy

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Direct Observation of Hydrodynamic Rotation-Translation Coupling between Two Colloidal Spheres

Author(s) -

S. Garcı́a Martı́n,

Michael Reichert,

Holger Stark,

Thomas Gisler

Publication year - 2006

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.97.248301

Subject(s) - spheres , optical tweezers , physics , polarizer , birefringence , rotation (mathematics) , orientation (vector space) , coupling (piping) , polarization (electrochemistry) , translation (biology) , complex fluid , stokes flow , materials science , classical mechanics , molecular physics , optics , mechanics , flow (mathematics) , geometry , chemistry , biochemistry , mathematics , astronomy , messenger rna , metallurgy , gene

By combining optical tweezers with polarization microscopy, the hydrodynamic coupling between position and orientation fluctuations in a pair of colloidal spheres has been measured. Imaging of birefringent particles under crossed polarizers allows for the simultaneous determination of the positions and orientations of both particles. The temporal cross-correlation function between random displacements of one particle and orientation fluctuations of its neighbor allows for the quantification of the hydrodynamic rotation-translation coupling between the spheres. Our results are in good agreement with predictions for the hydrodynamic mobility tensors calculated in the creeping-flow limit of the Navier-Stokes equation.

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