Self-propelled droplets

Seemann, Ralf; Fleury, Jean‐Baptiste; Maaß, Corinna C.

doi:10.1140/epjst/e2016-60061-7

Cited by 60 publications

(65 citation statements)

References 50 publications

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“…The angular velocity components in the body-fixed frame may be calculated from Eq. (7) and one finds that they are zero since the sum of the concentration gradients around the sphere becomes zero.…”

Section: B Concentration Fieldmentioning

confidence: 99%

Active rotational dynamics of a self-diffusiophoretic colloidal motor

et al. 2020

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The dynamics of a spherical chemically-powered synthetic colloidal motor that operates by a self-diffusiophoretic mechanism and has a catalytic domain of arbitrary shape is studied using both continuum theory and particle-based simulations. The motor executes active rotational motion when self-generated concentration gradients and interactions between the chemical species and colloidal motor surface break spherical symmetry. Local variations of chemical reaction rates on the motor catalytic surface with catalytic domain sizes and shapes provide such broken symmetry conditions. A continuum theoretical description of the active rotational motion is given, along with the results of particle-based simulations of the active dynamics. From these results a detailed description of the factors responsible for the active rotational dynamics can be given. Since active rotational motion often plays a significant part in the nature of the collective dynamics of many-motor systems and can be used to control motor motion in targeted cargo transport, our results should find applications beyond those considered here.

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Section: B Concentration Fieldmentioning

confidence: 99%

Active rotational dynamics of a self-diffusiophoretic colloidal motor

et al. 2020

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“…[23], the straightforward implication of Eqs. (15) and (19) is that a spherical particle with uniform properties in terms of chemical activity -i.e., only the amplitude f 0 is nonzero -can neither exhibit self-motility (for which U (f ) = 0) nor induce flow in an unbounded fluid because in this case all coefficients B n vanish.…”

Section: Iii1 Position Independent Phoretic Mobility B(rp )mentioning

confidence: 99%

Effective squirmer models for self-phoretic chemically active spherical colloids

et al. 2018

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Various aspects of self-motility of chemically active colloids in Newtonian fluids can be captured by simple models for their chemical activity plus a phoretic slip hydrodynamic boundary condition on their surface. For particles of simple shapes (e.g., spheres) -as employed in many experimental studies -which move at very low Reynolds numbers in an unbounded fluid, such models of chemically active particles effectively map onto the well studied so-called hydrodynamic squirmers [S. Michelin and E. Lauga, J. Fluid Mech. 747, 572 (2014)]. Accordingly, intuitively appealing analogies of "pusher/puller/neutral" squirmers arise naturally. Within the framework of self-diffusiophoresis we illustrate the above mentioned mapping and the corresponding flows in an unbounded fluid for a number of choices of the activity function (i.e., the spatial distribution and the type of chemical reactions across the surface of the particle). We use the central collision of two active particles as a simple, paradigmatic case for demonstrating that in the presence of other particles or boundaries the behavior of chemically active colloids may be qualitatively different, even in the far field, from the one exhibited by the corresponding "effective squirmer", obtained from the mapping in an unbounded fluid. This emphasizes that understanding the collective behavior and the dynamics under geometrical confinement of chemically active particles necessarily requires to explicitly account for the dependence of the hydrodynamic interactions on the distribution of chemical species resulting from the activity of the particles.I.

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“…First technical realizations of self-propelled objects have been developed for different driving mechanisms and conversion strategies. The fundamental driving mechanisms as well as state-of-the-art technologies of artificial microswimmers are covered in several minireviews [8][9][10][11][12][13].…”

Section: Artificial Microswimmersmentioning

confidence: 99%

Microswimmers – From Single Particle Motion to Collective Behavior

Gompper

Bechinger

Herminghaus

et al. 2016

Eur. Phys. J. Spec. Top.

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Abstract. Locomotion of autonomous microswimmers is a fascinating field at the cutting edge of science. It combines the biophysics of selfpropulsion via motor proteins, artificial propulsion mechanisms, swimming strategies at low Reynolds numbers, the hydrodynamic interaction of swimmers, and the collective motion and synchronisation of large numbers of agents. The articles of this Special Issue are based on the lecture notes of an international summer school, which was organized by the DFG Priority Programme 1726 "Microswimmers -From Single Particle Motion to Collective Behaviour" in the fall of 2015. The minireviews provide a broad overview of the field, covering both elementary and advanced material, as well as selected areas from current research.

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Self-propelled droplets

Cited by 60 publications

References 50 publications

Active rotational dynamics of a self-diffusiophoretic colloidal motor

Active rotational dynamics of a self-diffusiophoretic colloidal motor

Effective squirmer models for self-phoretic chemically active spherical colloids

Microswimmers – From Single Particle Motion to Collective Behavior

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