Phoretic motion in active matter

Brady, John F.

doi:10.1017/jfm.2021.530

Cited by 6 publications

(10 citation statements)

References 45 publications

(65 reference statements)

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“…We Laplace transform eqn (10) and ( 11) from T to s-space as L @c in @T À D1 r @ @r r@c in @r ¼ sĉ in À K ¼ D1 r @ @r r@c in @r…”

Section: Derivation Of Flux In the Auxiliary Problemmentioning

confidence: 99%

“…The movement of colloidal particles due to concentration gradients can be divided into two broad categories: active and passive diffusiophoresis. In active diffusiophoresis, [10][11][12][13] colloidal particles generate their own concentration gradients, while in passive diffusiophoresis, [14][15][16][17][18] particles respond to an externally generated gradient.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, there have been numerous experimental and theoretical reports exploring the motion of active diffusiophoretic particles. These include the effects of finite Peclet numbers, 19,20 asymmetry in the form of Janus particles and bent rods, [21][22][23] changes in the local fluid environment, 10,13,24,25 and the use of active droplets instead of particles. [26][27][28] Such systems have been proposed for uses in applications 29 such as environmental remediation, 30 drug delivery, 31 and cellular transport.…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

2023

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“…We Laplace transform eqn (10) and ( 11) from T to s-space as L @c in @T À D1 r @ @r r@c in @r ¼ sĉ in À K ¼ D1 r @ @r r@c in @r…”

Section: Derivation Of Flux In the Auxiliary Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

2023

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“…In a very recent theoretical work, [43] the concept of phoresis has been extended from passive to active systems. Specifically, the passive solvent with an externally applied thermal or chemical gradient is replaced by a fluid of ideal active Brownian particles with a spatially nonuniform activity or concentration.…”

Section: Introductionmentioning

confidence: 99%

“…This inhomogeneous activity-induced transport of passive objects has even been exploited to explain the experimental observation that the spontaneous movement of the nucleus from the cortex to the center of the oocyte cell, [47] where the activity of intracellular molecular motors is assumed to be position-dependent. However, most of these studies [43][44][45] only consider an ideal active bath composed of noninteracting self-propelled particles. On the other hand, although the active particles in Ref.…”

Section: Introductionmentioning

confidence: 99%

Active thermophoresis and diffusiophoresis

Liang¹,

Liu²,

Ye³

et al. 2022

Chinese Phys. B

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Thermo- and diffusiophoresis respectively refer to the directed drift of suspended particles in solutions with external thermal and chemical gradients, which have been widely used in the manipulation of mesoscopic particles. We here study a phoretic-like motion of a passive colloidal particle immersed in inhomogeneous active baths, where the thermal and chemical gradients are replaced separately by activity and concentration gradients of the active particles. By performing simulations, we show that the passive colloidal particle experiences phoretic-like forces that originate from its interactions with the inhomogeneous active fluid, and thus drifts along the gradient field, leading to an accumulation. The results are similar to the traditional phoretic effects occurring in passive colloidal suspensions, implying that the concepts of thermophoresis and diffusiophoresis could be generalized into active baths.

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Unified mobility expressions for externally driven and self-phoretic propulsion of particles

Ganguly,

Roychowdhury,

Gupta

2024

J. Fluid Mech.

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The mobility of externally driven phoretic propulsion of particles is evaluated by simultaneously solving the solute conservation equation, interaction potential equation and the modified Stokes equation. While accurate, this approach is cumbersome, especially when the interaction potential decays slowly compared with the particle size. In contrast to external phoresis, the motion of self-phoretic particles is typically estimated by relating the translation and rotation velocities with the local slip velocity. While this approach is convenient and thus widely used, it is only valid when the interaction decay length is significantly smaller than the particle size. Here, by taking inspiration from Brady (J. Fluid Mech., vol. 922, 2021, A10), which combines the benefits of two approaches, we reproduce their unified mobility expressions with arbitrary interaction potentials and show that these expressions can conveniently recover the well-known mobility relationships of external electrophoresis and diffusiophoresis for arbitrary double-layer thickness. Additionally, we show that for a spherical microswimmer, the derived expressions relax to the slip velocity calculations in the limit of the thin interaction length scales. We also employ the derived mobility expressions to calculate the velocities of an autophoretic Janus particle. We find that there is significant dampening in the translation velocity even when the interaction length is an order of magnitude larger than the particle size. Finally, we study the motion of a catalytically self-propelled particle, while it also propels due to external concentration gradients, and demonstrate how the two propulsion modes compete with each other.

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Phoretic motion in active matter

Abstract: Abstract

Cited by 6 publications

References 45 publications

Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

Active thermophoresis and diffusiophoresis

Unified mobility expressions for externally driven and self-phoretic propulsion of particles

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