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Probing linear and nonlinear microrheology of viscoelastic fluids
Soft Condensed Matter · Submitted 16 Dec 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We demonstrate that this transition is only determined by the ratio of the fluid's equilibrium relaxation time and the period of the driving.
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The abstract, sentence by sentence
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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Bulk rheological properties of viscoelastic fluids have been extensively studied in macroscopic shearing geometries. | background 1.00 | 0.04 | 0.01 | asserted 1.00 |
| s1 | However, little is known when an active microscopic probe is used to locally perturb them far from the linear-response regime. | gap 1.00 | 0.04 | 0.03 | asserted 1.00 |
| s2 | Using a colloidal particle dragged periodically by scanning optical tweezers through a viscoelastic fluid, we investigate both, its linear and nonlinear microrheological response. | contribution 0.77 | 0.97 | 0.07 | asserted 0.95 |
| s3 | 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. | result 1.00 | 0.96 | 0.21 | asserted 1.00 |
| s4 | We demonstrate that this transition is only determined by the ratio of the fluid's equilibrium relaxation time and the period of the driving. | result 0.79 | 0.93 | 0.78 | asserted 1.00 |
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The paper
Original abstract
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.
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