Straight-to-Curvilinear Motion Transition of a Swimming Droplet Caused by the Susceptibility to Fluctuations

Suda, Saori; Suda, Tomoharu; Ohmura, Takuya; Ichikawa, Masatoshi

doi:10.1103/physrevlett.127.088005

Cited by 37 publications

(35 citation statements)

References 40 publications

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“…While a full understanding of this intermediate helical regime appears unfeasible without extensive numerical modelling, we can speculate about the possible origins based on previous findings for swimming in a quasi-2D environment. 33,37,38 For our droplet system, we demonstrated that with increasing Pe the propulsion transitions from steady and persistent to unsteady and chaotic due to non-linear interactions between flow and chemical fields. 37…”

Section: Broken Rotational Symmetries In Individual Dropletsmentioning

confidence: 78%

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Spontaneously rotating clusters of active droplets

et al. 2022

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Section: Broken Rotational Symmetries In Individual Dropletsmentioning

confidence: 78%

“…These modes have been established both in theory 32–34 and in experimental realisations like self-propelling microdroplets. 35–38…”

Section: Introductionmentioning

confidence: 99%

Spontaneously rotating clusters of active droplets

et al. 2022

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“…We note that this universal dry active matter description sets limits to the model’s applicability wherever the specific details of the propulsion process become relevant. Droplets are propelled by self-generated hydrodynamic advection–diffusion instabilities in the interface, and changes in the local chemical environment might cause higher hydrodynamic modes that affect the droplet motion in a nonlinear manner ( 32 , 38 – 42 ). However, these higher modes are associated with critical Péclet numbers of surfactant transport.…”

Section: Discussionmentioning

confidence: 99%

Chemotactic self-caging in active emulsions

Hokmabad

Agudo-Canalejo

Saha

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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A common feature of biological self-organization is how active agents communicate with each other or their environment via chemical signaling. Such communications, mediated by self-generated chemical gradients, have consequences for both individual motility strategies and collective migration patterns. Here, in a purely physicochemical system, we use self-propelling droplets as a model for chemically active particles that modify their environment by leaving chemical footprints, which act as chemorepulsive signals to other droplets. We analyze this communication mechanism quantitatively both on the scale of individual agent–trail collisions as well as on the collective scale where droplets actively remodel their environment while adapting their dynamics to that evolving chemical landscape. We show in experiment and simulation how these interactions cause a transient dynamical arrest in active emulsions where swimmers are caged between each other’s trails of secreted chemicals. Our findings provide insight into the collective dynamics of chemically active particles and yield principles for predicting how negative autochemotaxis shapes their navigation strategy.

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“…At T = 16 °C, we see a mixed dipolar and quadrupolar flow field (modes n = 1, 2) corresponding to the meandering trajectory in Fig. 2a [20,21]. At even higher temperature, T = 21 °C, the droplet swims straight, Pe decreases and the flow field is purely dipolar (n = 1).…”

Section: Chemical and Flow Fieldsmentioning

confidence: 91%

“…Generally, their dynamics are characterized by a dimensionless Péclet number Pe, quantifying the ratio of advective and diffusive transport of chemical fuel [16]. With increasing Pe, autophoretic particles first transition from passive isotropic chemical conversion to active self-propulsion, and further from persistent to unsteady motion via a sequence of broken symmetries and interfacial flow modes of increasing complexity [14,[16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Arrested on heating: controlling the motility of active droplets by temperature

Ramesh¹,

Chen²,

Räder³

et al. 2023

Preprint

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One of the challenges in tailoring the dynamics of active, self-propelling agents lies in arresting and releasing these agents at will. Here, we present an experimental system of active droplets with thermally controllable and reversible states of motion, from unsteady over meandering to persistent to arrested motion. These states depend on the Péclet number of the chemical reaction driving the motion, which we can tune by using a temperature sensitive mixture of surfactants as a fuel medium. We quantify the droplet dynamics by analysing flow and chemical fields for the individual states, comparing them to canonical models for autophoretic particles. In the context of these models, we are able to observe in situ the fundamental first transition between the isotropic, immotile base state and self-propelled motility.

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Straight-to-Curvilinear Motion Transition of a Swimming Droplet Caused by the Susceptibility to Fluctuations

Cited by 37 publications

References 40 publications

Spontaneously rotating clusters of active droplets

Spontaneously rotating clusters of active droplets

Chemotactic self-caging in active emulsions

Arrested on heating: controlling the motility of active droplets by temperature

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