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Probing linear and nonlinear microrheology of viscoelastic fluids

Europhysics letters, 2014-12, Vol.108 (5), p.54008-p1-54008-p6 [Peer Reviewed Journal]

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Title:
Probing linear and nonlinear microrheology of viscoelastic fluids
Author: Gomez-Solano, J. R. ; Bechinger, C.
Subjects: 47.50.-d ; 83.60.Rs ; 83.85.-c ; Constants ; Drag force ; Nonlinearity ; Scanning ; Shearing ; Thinning ; Viscoelastic fluids ; Viscosity
Is Part Of: Europhysics letters, 2014-12, Vol.108 (5), p.54008-p1-54008-p6
Description: Bulk rheological properties of viscoelastic fluids have been extensively studied in macroscopic shearing geometries. However, little is known when an active microscopic probe is used to locally perturb them far from the linear-response regime. Using a colloidal particle dragged periodically by scanning optical tweezers through a viscoelastic fluid, we investigate both, its linear and nonlinear microrheological response. With increasing particle velocity, we observe a transition from constant viscosity to a thinning regime, where the drag force on the probe becomes a nonlinear function of the particle velocity. We demonstrate that this transition is only determined by the ratio of the fluid's equilibrium relaxation time and the period of the driving.
Publisher: EDP Sciences, IOP Publishing and Società Italiana di Fisica
Language: English
Identifier: ISSN: 0295-5075
EISSN: 1286-4854
DOI: 10.1209/0295-5075/108/54008
CODEN: EULEEJ
Source: Alma/SFX Local Collection

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