Phoretic colloids close to and trapped at fluid interfaces

Malgaretti, Paolo; Harting, Jens

doi:10.1002/cnma.202100196

Cited by 14 publications

(13 citation statements)

References 83 publications

(105 reference statements)

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“…In addition, we allow different solubilities of the chemical in the two liquid media (Domínguez et al 2016;Malgaretti & Harting 2021), leading to a discontinuity in concentration at the interface…”

Section: Equations For the Concentration Fieldmentioning

confidence: 99%

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Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid–fluid interface

2022

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Breaking spatial symmetry is an essential requirement for phoretic active particles to swim at low Reynolds number. This fundamental prerequisite for swimming at the micro scale is fulfilled either by chemical patterning of the surface of active particles or alternatively by exploiting geometrical asymmetries to induce chemical gradients and achieve self-propulsion. In the present paper, a far-field analytical model is employed to quantify the leading-order contribution to the induced phoretic velocity of a chemically homogeneous isotropic active colloid near a finite-sized disk of circular shape resting on an interface separating two immiscible viscous incompressible Newtonian fluids. To this aim, the solution of the phoretic problem is formulated as a mixed-boundary-value problem that is subsequently transformed into a system of dual integral equations on the inner and outer domains. Depending on the ratio of different involved viscosities and solute solubilities, the sign of phoretic mobility and chemical activity, as well as the ratio of particle–interface distance to the radius of the disk, the isotropic active particle is found to be repelled from the interface, be attracted to it, or reach a stable hovering state and remain immobile near the interface. Our results may prove useful in controlling and guiding the motion of self-propelled phoretic active particles near aqueous interfaces.

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Section: Equations For the Concentration Fieldmentioning

confidence: 99%

“…In addition, we allow different solubilities of the chemical in the two liquid media (Domínguez et al. 2016; Malgaretti & Harting 2021), leading to a discontinuity in concentration at the interface where is the partition constant. In an unperturbed fluid, it determines the ratio between equilibrium concentrations as .…”

Section: Problem Formulationmentioning

confidence: 99%

Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid–fluid interface

2022

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“…Recently, the focus of theoretical research has shifted towards swimming in complex environments like channels [35,36] or near fluid interfaces [31,37], and the question of collective swimmer dynamics has become of major interest. The present work aims at understanding the collective dynamics of several microswimmers [38,39].…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Simulations of Two Linear Microswimmers Using the Immersed Boundary Method

Geyer¹,

Ziegler²,

A.³

et al. 2023

CICP

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The performance of a single or the collection of microswimmers strongly depends on the hydrodynamic coupling among their constituents and themselves. We present a numerical study for a single and a pair of microswimmers based on lattice Boltzmann method (LBM) simulations. Our numerical algorithm consists of two separable parts. Lagrange polynomials provide a discretization of the microswimmers and the lattice Boltzmann method captures the dynamics of the surrounding fluid. The two components couple via an immersed boundary method. We present data for a single swimmer system and our data also show the onset of collective effects and, in particular, an overall velocity increment of clusters of swimmers.

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“…These observations also provide insights into the dynamic interaction of water droplets with dust particles in capillary-driven self-cleaning. Moreover, the current study can have a potential impact in many other applications, where meniscus-particle interactions at the micro-scale play a vital role, such as capillary dynamics in nanometric contacts, 17 hydrophilous pollination, 18 colloidal transport 19 and fluid flow 20 in porous media, evaporating liquid marbles, 21,22 liquid marbles in liquid, 23 phoretic colloids 24 and detachment of particles from fluid interfaces. 25…”

Section: Introductionmentioning

confidence: 99%

Insights into capillary-driven motion of micro-particles interacting with advancing meniscus on a substrate

Sajjad

Raza

et al. 2022

Soft Matter

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Phoretic colloids close to and trapped at fluid interfaces

Cited by 14 publications

References 83 publications

Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid–fluid interface

Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid–fluid interface

Lattice Boltzmann Simulations of Two Linear Microswimmers Using the Immersed Boundary Method

Insights into capillary-driven motion of micro-particles interacting with advancing meniscus on a substrate

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