Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

Peter, Toni; Malgaretti, Paolo; Rivas, Nicolas; Scagliarini, Andrea; Harting, Jens; Dietrich, S.

doi:10.1039/c9sm02247c

Cited by 21 publications

(16 citation statements)

References 43 publications

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“…In Ref. [69], authors present a novel numerical approach within which the motion of the self-diffusiophoretic colloid is obtained by using the lattice Boltzmann method [76][77][78], in order to construct approximate solutions of the Navier-Stokes equation directly. Within the scheme of Ref.…”

Section: Phoretic Colloids Trapped At Fluid Interfacesmentioning

confidence: 99%

Phoretic colloids close to and trapped at fluid interfaces

Malgaretti¹,

Harting²

2021

Preprint

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The active motion of phoretic colloids leads them to accumulate at boundaries and interfaces. Such an excess accumulation, with respect to their passive counterparts, makes the dynamics of phoretic colloids particularly sensitive to the presence of boundaries and pave new routes to externally control their single particle as well as collective behavior. Here we review some recent theoretical results about the dynamics of phoretic colloids close to and adsorbed at fluid interfaces in particular highlighting similarities and differences with respect to solid-fluid interfaces.

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Section: Phoretic Colloids Trapped At Fluid Interfacesmentioning

confidence: 99%

Phoretic colloids close to and trapped at fluid interfaces

Malgaretti¹,

Harting²

2021

Preprint

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“…Extensive efforts have gone into investigating particles at the gas-liquid and liquid-liquid interface [14,[22][23][24]. The body of theoretical and experimental work studying particles at the solid surface is much less than that for gas-liquid interface, although there is a growing literature in this area.…”

Section: Introductionmentioning

confidence: 99%

Light-induced manipulation of passive and active microparticles

et al. 2021

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We consider sedimented at a solid wall particles that are immersed in water containing small additives of photosensitive ionic surfactants. It is shown that illumination with an appropriate wavelength, a beam intensity profile, shape and size could lead to a variety of dynamic, both unsteady and steady state, configurations of particles. These dynamic, well-controlled and switchable particle patterns at the wall are due to an emerging diffusio-osmotic flow that takes its origin in the adjacent to the wall electrostatic diffuse layer, where the concentration gradients of surfactant are induced by light. The conventional nonporous particles are passive and can move only with already generated flow. However, porous colloids actively participate themselves in the flow generation mechanism at the wall, which also sets their interactions that can be very long ranged. This light-induced diffusio-osmosis opens novel avenues to manipulate colloidal particles and assemble them to various patterns. We show in particular how to create and split optically the confined regions of particles of tunable size and shape, where well-controlled flow-induced forces on the colloids could result in their crystalline packing, formation of dilute lattices of well-separated particles, and other states. Graphic Abstract

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“…Similarly, phoretic colloids attains motion by catalyzing chemical reactions on their surfaces. When such system are in the vicinity of a fluid interface 8,9 , their chemical activity affects the local surface tension possibly leading to a variety of phenomena including the onset of Marangoni flows 10 .…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous surface tension of chemically active fluid interfaces

Squarcini

Malgaretti

2020

The Journal of Chemical Physics

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We study the dependence of the surface tension of a fluid interface on the density profile of a third suspended phase. By means of an approximated model for the binary mixture and of a perturbative approach we derive close formulas for the free energy of the system and for the surface tension of the interface. Our results show a remarkable non-monotonous dependence of the surface tension on the peak of the density of the suspended phase. Our results also predict the local value of the surface tension in the case in which the density of the suspended phase is not homogeneous along the interface.

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Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

Cited by 21 publications

References 43 publications

Phoretic colloids close to and trapped at fluid interfaces

Phoretic colloids close to and trapped at fluid interfaces

Light-induced manipulation of passive and active microparticles

Inhomogeneous surface tension of chemically active fluid interfaces

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