Proposal and testing of dual-beam dynamic light scattering for two-particle microrheology

A dual-beam dynamic light-scattering arrangement is devised to measure the time-dependent mean squared relative displacement of a pair of tracer particles with a small separation of micrometers. The technique is tested by the measurement of the relative diffusion of polymer latex spheres suspended i...

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Bibliographic Details
Published in:Applied optics (2004) 2004-06, Vol.43 (17), p.3382-3390
Main Authors: Qiu, Xin-Liang, Tong, Penger, Ackerson, Bruce J
Format: Article
Language:English
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Summary:A dual-beam dynamic light-scattering arrangement is devised to measure the time-dependent mean squared relative displacement of a pair of tracer particles with a small separation of micrometers. The technique is tested by the measurement of the relative diffusion of polymer latex spheres suspended in a simple viscous fluid. The experiment verifies the theory and demonstrates its applications. The dual-beam dynamic light-scattering technique, when combined with an optical microscope, provides a powerful tool for the study of two-particle microrheology of soft materials. The advantages of the new technique are its high statistical accuracy, faster temporal response, and ease of use.
ISSN:1559-128X
DOI:10.1364/AO.43.003382