Probing linear and nonlinear microrheology of viscoelastic fluids

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.

arXiv comment6 pages, 5 figures

References in corpus (5)

• Undulatory swimming in viscoelastic fluids
• Forced motion of a probe particle near the colloidal glass transition
• Colloids dragged through a polymer solution: experiment, theory and simulation
• Probing active forces via a fluctuation-dissipation relation: Application to living cells
• Out-of-equilibrium microrheology using optical tweezers to probe directional viscoelastic properties under shear

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• Properties of a nonlinear bath: Experiments, theory, and a stochastic Prandtl-Tomlinson model
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• Work extraction and performance of colloidal heat engines in viscoelastic baths
• Memory-induced oscillations of a driven particle in a dissipative correlated medium
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• Stochastic thermodynamics of a probe in a fluctuating correlated field
• Thinning and thickening in active microrheology
• Non-Gaussian fluctuations of a probe coupled to a Gaussian field
• Molecular origin of driving-dependent friction in fluids
• A mesoscale study of creep in a microgel using the acoustic radiation force
• Discontinuous Thinning in Active Microrheology of Soft Complex Matter
• Correlating microscopic viscoelasticity and structure of an aging colloidal gel using active microrheology and cryogenic scanning electron microscopy
• The Spatial Crossover between Far-From-Equilibrium and Near-Equilibrium Dynamics in Locally Driven Suspensions
• Tunable Memory and Activity of Quincke Particles in Micellar Fluid
• Micro-rheology of a particle in a nonlinear bath: Stochastic Prandtl-Tomlinson model
• Recoil of a driven tracer in a correlated medium
• Minimal dissipation with viscoelastic baths in weakly driven processes