Diffusion of active dimers in a Couette flow

Debnath, Tanwi; Ghosh, Parthasarathi; Nori, Franco; Li, Yunyun; Marchesoni, F.; Li, Baowen

doi:10.1039/c7sm00356k

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…Normal and anomalous diffusion in the crowded solutions of anisotropic and/or non-spherical-as well as of spherical but non-isotropically interacting 80,81molecules was examined in a number of studies , including some recent experimental investigations 96,99,104 . The diffusive properties of molecules of dumbbell-, ellipsoid-, and rod-like shape 82,96,97,100,101,[104][105][106][107][108][109] , protein molecules 110,111 , active and passive dimers with anisotropic mobility 89,102,106,[112][113][114] , self-propelled massive particles with time-dependent mass 109 , colloidal dimers and flexible multimers 115,116 , stiff self-propelled filaments in crowded solutions 117 , trimer-like tracers in 2D 93,95 and tetrahedral patchy particles in 3D 81,118 , as well as the dynamics of elongated particles with fluctuating and oscillating shapes [119][120][121] were studied recently as well.…”

Section: B Anomalous Diffusion Macromolecular Crowding and Spreading ...mentioning

confidence: 99%

Non-Gaussian, transiently anomalous, and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: Coupled translational and rotational motions

et al. 2021

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We employ Langevin-dynamics simulations to unveil non-Brownian and non-Gaussian center-ofmass self-diffusion of massive flexible dumbbell-shaped particles in crowded two-dimensional solutions. We also study the intra-dumbbell dynamics due to the relative motion of the two constituent elastically-coupled disks. Our main focus is on effects of the crowding fraction φ and the particle structure on the diffusion characteristics. We evaluate the time-averaged mean-squared displacement (TAMSD), the displacement probability-density function (PDF) and the displacement autocorrelation function (ACF) of the dimers. For the TAMSD at highly crowded conditions of dumbbells, e.g., we observe a transition from the short-time ballistic behavior, via an intermediate subdiffusive regime, to long-time Brownian-like spreading dynamics. The crowded system of dimers exhibits two distinct diffusion regimes distinguished by the scaling exponent of the TAMSD, the dependence of the diffusivity on φ, and the features of the displacement-ACF. We attribute these regimes to a crowding-induced transition from a viscous to a viscoelastic diffusion medium upon growing φ. We also analyze the relative motion in the dimers, finding that larger φ suppress their vibrations and yield strongly non-Gaussian PDFs of rotational displacements. For the diffusion coefficients D(φ) of translational and rotational motion of the dumbbells an exponential decay with φ for weak and a power-law D(φ) ∝ (φ − φ ) 2.4 for strong crowding is found. A comparison of simulation results with theoretical predictions for D(φ) is discussed and some relevant experimental systems are overviewed.

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Section: B Anomalous Diffusion Macromolecular Crowding and Spreading ...mentioning

confidence: 99%

Non-Gaussian, transiently anomalous, and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: Coupled translational and rotational motions

et al. 2021

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“…Based on the rigid dimer model, the diffusion properties of the active-passive composite system are detailed in Ref. [30,35]. For the sake of simplicity, if suffices to recall here that the noise strength D r plays the role of an orientational diffusion constant, whose inverse, τ r , quantifies the temporal persistency of the isotropic Brownian motion of the dimer's center of mass.…”

Section: A Mean Exit Time In the Absence Of Hydrodynamic Interactionsmentioning

confidence: 99%

“…To go forward to materialize the idea of using JPs as a drag carrier, in our previous study [30] we explored some relevant issues in diffusion of Janus particles carrying a cargo in a shear flow. In this paper, we explore escape kinetics of a Janus particle carrying a load from an energetic trap modelled by a meta-stable potential.…”

Section: Introductionmentioning

confidence: 99%

Activated barrier crossing dynamics of a Janus particle carrying cargo

Debnath

Ghosh

2018

Phys. Chem. Chem. Phys.

Self Cite

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We numerically study the escape kinetics of a self-propelled Janus particle, carrying a cargo, from a meta-stable state. We assume that the cargo is attached to the Janus particle by a flexible harmonic spring. We take into account the effect of the velocity field created in the fluid due to movements of the dimer's components, by considering a space-dependent diffusion tensor (Oseen tensor). Our simulation results show that the synchronization between barrier crossing events and the rotational relaxation process can enhance the escape rate to a large extent. Also, the load carrying capability of a Janus particle is largely controlled by its rotational dynamics and self-propulsion velocity. Moreover, the hydrodynamic interaction, conspicuously, enhances the escape rate of the Janus-cargo dimer. The most important features in escape kinetics have been justified based on analytic arguments.

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“…Normal and anomalous diffusion in the crowded solutions of anisotropic and/or non-spherical-as well as of spherical but non-isotropically interacting 80,81 molecules was examined in a number of studies , including some recent experimental investigations 96,99,104 . The diffusive properties of molecules of dumbbell-, ellipsoid-, and rod-like shape 82,96,97,100,101,[104][105][106][107][108][109] , protein molecules 110,111 , active and passive dimers with anisotropic mobility 89,102,106,[112][113][114] , self-propelled massive particles with time-dependent mass 109 , colloidal dimers and flexible multimers 115,116 , stiff self-propelled filaments in crowded solutions 117 , trimer-like tracers in 2D 93,95 and tetrahedral patchy particles in 3D 81,118 , as well as the dynamics of elongated particles with fluctuating and oscillating shapes [119][120][121] were studied recently as well.…”

Section: B Anomalous Diffusion Macromolecular Crowding and Spreading Of Non-spherical Particlesmentioning

confidence: 99%

Non-Gaussian, transiently anomalous and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: coupled translational and rotational motions

Klett

Cherstvy

Shin

et al. 2021

Preprint

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We employ Langevin-dynamics simulations to unveil non-Brownian and non-Gaussian center-of-mass self-diffusion of massive flexible dumbbell-shaped particles in crowded two-dimensional solutions. We also study the intra-dumbbell dynamics due to the relative motion of the two constituent elastically-coupled disks. Our main focus is on effects of the crowding fraction φ and the particle structure on the diffusion characteristics. We evaluate the time-averaged mean-squared displacement (TAMSD), the displacement probability-density function (PDF) and the displacement autocorrelation function (ACF) of the dimers. For the TAMSD at highly crowded conditions of dumbbells, e.g., we observe a transition from the short-time ballistic behavior, via an intermediate subdiffusive regime, to long-time Brownian-like spreading dynamics. The crowded system of dimers exhibits two distinct diffusion regimes distinguished by the scaling exponent of the TAMSD, the dependence of the diffusivity on φ, and the features of the displacement-ACF. We attribute these regimes to a crowding-induced transition from a viscous to a viscoelastic diffusion medium upon growing φ. We also analyze the relative motion in the dimers, finding that larger φ suppress their vibrations and yield strongly non-Gaussian PDFs of rotational displacements. For the diffusion coefficients D(φ) of translational and rotational motion of the dumbbells an exponential decay with φ for weak and a power-law D(φ) ∝ (φ - φ*)2.4 for strong crowding is found. A comparison of simulation results with theoretical predictions for D(φ) is discussed and some relevant experimental systems are overviewed.

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Diffusion of active dimers in a Couette flow

Cited by 8 publications

References 33 publications

Non-Gaussian, transiently anomalous, and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: Coupled translational and rotational motions

Non-Gaussian, transiently anomalous, and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: Coupled translational and rotational motions

Activated barrier crossing dynamics of a Janus particle carrying cargo

Non-Gaussian, transiently anomalous and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: coupled translational and rotational motions

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