Measuring storage and loss moduli using optical tweezers: Broadband microrheology

Manlio Tassieri, Graham M. Gibson, R. M. L. Evans, Alison M. Yao, Rebecca Warren, Miles J. Padgett, and Jonathan M. Cooper
Phys. Rev. E 81, 026308 – Published 18 February 2010

Abstract

We present an experimental procedure to perform broadband microrheological measurements with optical tweezers. A generalized Langevin equation is adopted to relate the time-dependent trajectory of a particle in an imposed flow to the frequency-dependent moduli of the complex fluid. This procedure allows us to measure the material linear viscoelastic properties across the widest frequency range achievable with optical tweezers.

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  • Received 15 July 2009

DOI:https://doi.org/10.1103/PhysRevE.81.026308

©2010 American Physical Society

Authors & Affiliations

Manlio Tassieri1,*, Graham M. Gibson2, R. M. L. Evans3, Alison M. Yao2, Rebecca Warren1, Miles J. Padgett2, and Jonathan M. Cooper1

  • 1Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
  • 2Department of Physics and Astronomy, SUPA, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 3School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom

  • *m.tassieri@elec.gla.ac.uk

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Vol. 81, Iss. 2 — February 2010

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