Erratum: Autonomously Probing Viscoelasticity in Disordered Suspensions [Phys. Rev. Lett. 125 , 258002 (2020)]

Understanding enhanced rotational dynamics of active probes in rod suspensions

“…In particular, it is not clear whether ERD can be understood (i) by treating the fluid as an effective medium with large-compared to Newtonian fluidsstress-relaxation time, 4,14 or (ii) by explicitly considering the mesoscopic particulate structure of the swimming medium. 5,13 To fully exploit the potential of APs as microrheological probes, however, a detailed insight into their coupling to complex fluids is mandatory.…”

“…[1][2][3] Because their motion strongly depends on the properties of the surrounding liquid, APs can additionally serve as microrheological probes capable of characterizing the properties of the swimming medium. 4,5 Opposed to Newtonian, i.e., purely viscous fluids, where the behavior of APs has been studied in great detail, 3,6 much less is known when these particles move in complex fluids, e.g., polymer and micellar solutions or dense colloidal suspensions. The fluid's nonlinear rheological properties can lead to a strongly modified AP translational dynamics as observed in experiments 7,8 and confirmed by theory.…”

Transport of a self-propelled tracer through a hairy cylindrical channel: interplay of stickiness and activity

“…38 Computer simulations have shown that the rotational diffusivity of a self-propelled Janus particle in the crowded environment exhibits a nonmonotonous behavior while translational diffusivity decreases monotonically with the area fraction of the crowders. 39,40 On the other hand, enhancement in translational motion of the cell and a sharp decline in rotational diffusion are observed in an experimental study of E. coli in polymeric solutions. 41 The dynamical behavior is significantly affected by the activity, degree of confinement, steric hindrance, interactions with the medium, and architecture of the surrounding environment.…”

Transport of a self-propelled tracer through a hairy cylindrical channel: interplay of stickiness and activity

“…For example, experimental investigation of self-propelled Janus particles in viscoelastic fluid demonstrated that the rotational diffusion of the particle gets enhanced with the self-propulsion velocity 38 . Computer simulations have shown that the rotational diffusivity of a self-propelled Janus particle in the crowded environment exhibits a nonmonotonous behavior while translational diffusivity decreases monotonically with the area fraction of the crowders 39,40 . On the other hand, enhancement in translational motion of the cell and a sharp decline in rotational diffusion are observed in an experimental study of E. coli in polymeric solutions 41 .…”