Non-Newtonian effects on the slip and mobility of a self-propelling active particle

Choudhary, Akash; Renganathan, T.

doi:10.1017/jfm.2020.428

Cited by 12 publications

(8 citation statements)

References 47 publications

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“…Similar conclusions appear to apply qualitatively to autophoretic Janus particle [118,119]. In that case, the type of swimmer (pusher vs. puller) is determined by the sign of the local phoretic mobility and the ratio between active and inert regions.…”

Section: Squirmer Modelsupporting

confidence: 63%

Microswimming in viscoelastic fluids

Li¹,

Lauga²,

Ardekani³

2021

Preprint

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The locomotion of microorganisms and spermatozoa in complex viscoelastic fluids is of critical importance in many biological processes such as fertilization, infection, and biofilm formation. Depending on their propulsion mechanisms, microswimmers display various responses to a complex fluid environment: increasing or decreasing their swimming speed and efficiency, modifying their propulsion kinematics and swimming gaits, and experiencing different hydrodynamic interactions with their surroundings. In this article, we review the fundamental physics of locomotion of biological and synthetic microswimmers in complex viscoelastic fluids. Starting from a continuum framework, we describe the main theoretical approaches developed to model microswimming in viscoelastic fluids, which typically rely on asymptotically-small dimensionless parameters. We then summarise recent progress on the mobility of single cells propelled by cilia, waving flagella and rotating helical flagella in unbounded viscoelastic fluids. We next briefly discuss the impact of other physical factors, including the micro-scale heterogeneity of complex biological fluids, the role of Brownian fluctuations of the microswimmers, the effect of polymer entanglement and the influence of shear-thinning viscosity. In particular, for solution of long polymer chains whose sizes are comparable to the radius of flagella, continuum models cannot be used and instead Brownian Dynamics for the polymers can predict the swimming dynamics. Finally, we discuss the effect of viscoelasticity on the dynamics of microswimmers in the presence of surfaces or external flows and its impact on collective cellular behavior.

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Section: Squirmer Modelsupporting

confidence: 63%

Microswimming in viscoelastic fluids

Li¹,

Lauga²,

Ardekani³

2021

Preprint

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“…Recent exceptions include the experimental works [315][316][317] which have provided important insights into the dynamics of active particles in viscoelastic media (so far mainly at the single particle level). In addition, the very recent theoretical work [318] has shown that viscoelastic effects can significantly modify the slip velocity on the active surface of the particles, which should have profound consequences not only for the single particle behavior but also for the (phoretic) cross-interactions of these particles.…”

Section: Memory and Solute Advection Effectsmentioning

confidence: 99%

Which interactions dominate in active colloids?

Liebchen

Löwen

2019

The Journal of Chemical Physics

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Despite a mounting evidence that the same gradients which active colloids use for swimming, induce important crossinteractions (phoretic interaction), they are still ignored in most many-body descriptions, perhaps to avoid complexity and a zoo of unknown parameters. Here we derive a simple model, which reduces phoretic far-field interactions to a pair-interaction whose strength is mainly controlled by one genuine parameter (swimming speed). The model suggests that phoretic interactions are generically important for autophoretic colloids (unless effective screening of the phoretic fields is strong) and should dominate over hydrodynamic interactions for the typical case of half-coating and moderately nonuniform surface mobilities. Unlike standard minimal models, but in accordance with canonical experiments, our model generically predicts dynamic clustering in active colloids at low density. This suggests that dynamic clustering can emerge from the interplay of screened phoretic attractions and active diffusion.

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“…Very recently, for active droplets in a viscoelastic media, Dwivedi et al demonstrated a Peclet-induced transition in the swimming mode and also deformation in their shapes . For phoretic colloids, numerous theoretical and computational studies have attempted to understand the behavior of self-propelled colloids in complex media. − So far, light-activated JCs have been chiefly used to study the dynamics of active JCs in viscoelastic media experimentally. ,,, Gomez-Solano et al demonstrated that the bulk viscoelastic stresses decouple the translational and rotational dynamics of the active JC . Narinder et al showed that increasing the propulsion force resulted in persistent cycloid trajectories .…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Active SiO₂–Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions

et al. 2023

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Self-propelled Janus colloids (JCs) have recently gained much attention due to their ability to move autonomously and mimic biological microswimmers. This ability makes them suitable for prospective drug/cargo-delivery applications in microscopic domains. Understanding their dynamics in surroundings doped with macromolecules such as polymers is crucial, as most of the target application media are complex in nature. In this study, we investigate the selfdiffusiophoretic motion of hydrogen peroxide-fuelled SiO 2 −Pt JCs in the presence of dilute amounts of poly(ethylene oxide) (PEO). Despite the addition of PEO chains producing a Newtonian behavior with negligible increase in viscosity, the ballistic movement and rotational fluctuations of active JCs are observed to be significantly suppressed. With an increase in the polymer concentration, this leads to a transition from smooth to jittery to cage-hopping to the arrested motion of active JCs. We further propose that the anisotropic interaction of the polymers with the JC increases the "local drag" of the medium, resulting in the unusual impediment of the active motion.

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Non-Newtonian effects on the slip and mobility of a self-propelling active particle

Abstract: Abstract

Cited by 12 publications

References 47 publications

Microswimming in viscoelastic fluids

Microswimming in viscoelastic fluids

Which interactions dominate in active colloids?

Dynamics of Active SiO₂–Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions

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Non-Newtonian effects on the slip and mobility of a self-propelling active particle

Abstract: Abstract

Cited by 12 publications

References 47 publications

Microswimming in viscoelastic fluids

Microswimming in viscoelastic fluids

Which interactions dominate in active colloids?

Dynamics of Active SiO2–Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions

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Product

Resources

About

Dynamics of Active SiO₂–Pt Janus Colloids in Dilute Poly(ethylene oxide) Solutions