Spontaneous mode-selection in the self-propelled motion of a solid/liquid composite driven by interfacial instability

Takabatake, Fumi; Magome, Nobuyuki; Ichikawa, Masatoshi; Yoshikawa, Kenichi

doi:10.1063/1.3567096

Cited by 52 publications

(66 citation statements)

References 19 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, in some experiments 10,44 self-propelled droplets on liquidair interfaces can be exposed to linear shear fields by putting the carrier liquid between two parallel confining walls that move alongside into opposite directions. This induces an approximately planar linear shear gradient at the surface of the carrier liquid, if the liquid container is sufficiently deep.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of a deformable active particle under shear flow

Tarama

Menzel

Hagen

et al. 2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

The motion of a deformable active particle in linear shear flow is explored theoretically. Based on symmetry considerations, in two spatial dimensions, we propose coupled nonlinear dynamical equations for the particle position, velocity, deformation, and rotation. In our model, both, passive rotations induced by the shear flow as well as active spinning motions, are taken into account. Our equations reduce to known models in the two limits of vanishing shear flow and vanishing particle deformability. For varied shear rate and particle propulsion speed, we solve the equations numerically and obtain a manifold of different dynamical modes including active straight motion, periodic motions, motions on undulated cycloids, winding motions, as well as quasi-periodic and chaotic motions induced at high shear rates. The types of motion are distinguished by different characteristics in the real-space trajectories and in the dynamical behavior of the particle orientation and its deformation. Our predictions can be verified in experiments on self-propelled droplets exposed to a linear shear flow.

show abstract

Section: Discussionmentioning

confidence: 99%

Dynamics of a deformable active particle under shear flow

Tarama

Menzel

Hagen

et al. 2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Spontaneous motion driven by inhomogeneity in interfacial tension is an area of study relating to active matter. [5][6][7][8][9][10][11][12][13][14][15][16] For example, alcohol droplets placed on water move spontaneously while exhibiting deformations to their shape. 17,18 Since such systems are relatively simple, it is possible to perform experiments under a broad parameter space; therefore, such a setting provides a preferable experimental framework for investigations of general aspects.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for self-propelled droplets driven by interfacial tension

Nagai

Tachibana

Tobe

et al. 2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

Articles you may be interested inNumerical study on the effects of non-dimensional parameters on drop-on-demand droplet formation dynamics and printability range in the up-scaled model Phys. Fluids 24, 082103 (2012) We propose a model for the spontaneous motion of a droplet induced by inhomogeneity in interfacial tension. The model is derived from a variation of the Lagrangian of the system and we use a time-discretized Morse flow scheme to perform its numerical simulations. Our model can naturally simulate the dynamics of a single droplet, as well as that of multiple droplets, where the volume of each droplet is conserved. We reproduced the ballistic motion and fission of a droplet, and the collision of two droplets was also examined numerically. C 2016 AIP Publishing LLC. [http://dx

show abstract

“…Experimental realizations of deformable self-propelled particles are, for instance, migrating cells and self-propelled droplets on rigid surfaces [85][86][87]. Moreover, activated droplets may self-propel over liquid surfaces and through bulk fluids [21,61,63,[88][89][90][91], which implies induced fluid flows and thus classifies them as deformable microswimmers. An interaction with imposed surrounding flow fields becomes important when rheological properties of active systems are considered [92], when the features of self-propelled microswimmers are exploited in microfluidic devices [93,94], or when microorganisms orient themselves in external shear flows [95].…”

Section: Introductionmentioning

confidence: 99%

Getting drowned in a swirl: Deformable bead-spring model microswimmers in external flow fields

2016

View full text Add to dashboard Cite

Deformability is a central feature of many types of microswimmers, e.g. for artificially generated self-propelled droplets. Here, we analyze deformable bead-spring microswimmers in an externally imposed solvent flow field as simple theoretical model systems. We focus on their behavior in a circular swirl flow in two spatial dimensions. Linear (straight) two-bead swimmers are found to circle around the swirl with a slight drift to the outside with increasing activity. In contrast to that, we observe for triangular three-bead or square-like four-bead swimmers a tendency of being drawn into the swirl and finally getting drowned, although a radial inward component is absent in the flow field. During one cycle around the swirl, the self-propulsion direction of an active triangular or square-like swimmer remains almost constant, while their orbits become deformed exhibiting an "egg-like" shape. Over time, the swirl flow induces slight net rotations of these swimmer types, which leads to net rotations of the egg-shaped orbits. Interestingly, in certain cases, the orbital rotation changes sense when the swimmer approaches the flow singularity. Our predictions can be verified in real-space experiments on artificial microswimmers.

show abstract

Spontaneous mode-selection in the self-propelled motion of a solid/liquid composite driven by interfacial instability

Cited by 52 publications

References 19 publications

Dynamics of a deformable active particle under shear flow

Dynamics of a deformable active particle under shear flow

Mathematical model for self-propelled droplets driven by interfacial tension

Getting drowned in a swirl: Deformable bead-spring model microswimmers in external flow fields

Contact Info

Product

Resources

About