Viscous Marangoni propulsion

Lauga, Eric; Davis, A. M. J.

doi:10.1017/jfm.2011.484

Cited by 99 publications

(102 citation statements)

References 54 publications

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“…This situation raises new issues, in particular if the reactants or the products have a significant effect on the properties of the fluid interface implying tensioactivity. For example, it has been recently predicted that catalytically active, spherical particles which are trapped at the interface may be set into motion along the interface by Marangoni flows, selfinduced via the spatially nonuniform distribution of tensioactive molecules [17][18][19]. (A similar motility mechanism can originate from thermally induced Marangoni flows if, e.g., the particle contains a metal cap which is heated by a laser beam [20].)…”

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confidence: 99%

Effective Interaction between Active Colloids and Fluid Interfaces Induced by Marangoni Flows

et al. 2016

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We show theoretically that near a fluid-fluid interface a single active colloidal particle generating, e.g., chemicals or a temperature gradient experiences an effective force of hydrodynamic origin. This force is due to the fluid flow driven by Marangoni stresses induced by the activity of the particle; it decays very slowly with the distance from the interface, and can be attractive or repulsive depending on how the activity modifies the surface tension. We show that, for typical systems, this interaction can dominate the dynamics of the particle as compared to Brownian motion, dispersion forces, or self-phoretic effects. In the attractive case, the interaction promotes the self-assembly of particles into a crystal-like monolayer at the interface. DOI: 10.1103/PhysRevLett.116.078301 Significant attention has been paid lately to micrometer sized particles capable of self-induced motility [1][2][3]. They are seen as promising candidates for novel techniques in chemical sensing [4] or water treatment [5]. The motion of active colloidal particles has been the subject of numerous experimental [1][2][3]6,7] and theoretical [8][9][10][11][12] studies. One realization is a particle with a catalytic surface promoting a chemical reaction in the surrounding solution [13]. For an axisymmetric particle lacking fore-and-aft symmetry, the distributions of reactant and product molecules may become nonuniform along its surface and the particle could move due to self-induced phoresis [14]. If the particle is spherically symmetric, it will remain immobile in bulk solution but can be set into motion by the vicinity of walls or other particles (not necessarily active) which break the spherical symmetry [10,[13][14][15][16].A relevant case corresponds to the movement of active particles bounded by a fluid-fluid interface. This situation raises new issues, in particular if the reactants or the products have a significant effect on the properties of the fluid interface implying tensioactivity. For example, it has been recently predicted that catalytically active, spherical particles which are trapped at the interface may be set into motion along the interface by Marangoni flows, selfinduced via the spatially nonuniform distribution of tensioactive molecules [17][18][19]. (A similar motility mechanism can originate from thermally induced Marangoni flows if, e.g., the particle contains a metal cap which is heated by a laser beam [20].) Furthermore, self-induced Marangoni flows, combined with a mechanism of triggering spontaneous symmetry breaking, have also been used to develop self-propelled droplets [21][22][23].However, another category of experimental situations occurs if the particles are not trapped at the interface but may reside in the vicinity of the interface or get near it during their motion. In this study we provide theoretical evidence that such catalytically active or locally heated spherical particles, although immobile in bulk, experience a very strong, long-ranged effective force field due to the Marangoni stresses...

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confidence: 99%

Effective Interaction between Active Colloids and Fluid Interfaces Induced by Marangoni Flows

et al. 2016

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“…Recently, the motion of chemically and thermally active colloids in the presence of fluid-fluid interfaces was investigated in theory [262][263][264][265][266][267] and in experiments [268]. Notably, the persistence length of chemically active Janus particles is greatly enhanced when moving at the water-air interface [268].…”

Section: Motion Near Surfacesmentioning

confidence: 99%

Emergent behavior in active colloids

Zöttl

Stark

2016

J. Phys.: Condens. Matter

512

559

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Active colloids are microscopic particles, which self-propel through viscous fluids by converting energy extracted from their environment into directed motion. We first explain how articial microswimmers move forward by generating near-surface flow fields via self-phoresis or the self-induced Marangoni effect. We then discuss generic features of the dynamics of single active colloids in bulk and in confinement, as well as in the presence of gravity, field gradients, and fluid flow. In the third part, we review the emergent collective behavior of active colloidal suspensions focussing on their structural and dynamic properties. After summarizing experimental observations, we give an overview on the progress in modeling collectively moving active colloids. While active Brownian particles are heavily used to study collective dynamics on large scales, more advanced methods are necessary to explore the importance of hydrodynamic and phoretic particle interactions. Finally, the relevant physical approaches to quantify the emergent collective behavior are presented.

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“…Other propulsion mechanisms exploit Marangoni effects at the surface to induce locomotion (Thutupalli, Seemann & Herminghaus 474 D. G. Crowdy 2011). Lauga & Davis (2012) have studied the phenomenon of viscous Marangoni selfpropulsion by considering a model 'boat', on the surface of a viscous fluid, which is Janus-like in having one portion of its boundary providing the driving mechanism via an imposed surfactant distribution with the rest of its boundary exhibiting a different Neumann-type boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Wall effects on self-diffusiophoretic Janus particles: a theoretical study

Crowdy

2013

J. Fluid Mech.

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We present a theoretical investigation of the self-diffusiophoresis of a class of twofaced, two-dimensional Janus particles propelled by the production of gradients in the concentration of a solute diffusing into a surrounding fluid at zero Reynolds and Péclet numbers. Those concentration gradients produce a tangential boundary slip resulting in translation and rotation of the particle, as a consequence of the fact that it is free of both force and torque. The model Janus particles studied here have piecewise constant surface mobilities and surface activities over two faces. An isolated circular Janus particle is studied first and its speed of locomotion in free space is found analytically. Confinement effects are then investigated by placing such a Janus particle near a straight no-slip wall. The governing nonlinear dynamical system is found in explicit form. It is used to study how the geometry, location and orientation of the particle relative to the wall affect its motion. It is found that if the particles do not hit the wall in finite time they are eventually repelled away from it.

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Viscous Marangoni propulsion

Cited by 99 publications

References 54 publications

Effective Interaction between Active Colloids and Fluid Interfaces Induced by Marangoni Flows

Effective Interaction between Active Colloids and Fluid Interfaces Induced by Marangoni Flows

Emergent behavior in active colloids

Wall effects on self-diffusiophoretic Janus particles: a theoretical study

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