Self-propulsion of an elliptical phoretic disk emitting solute uniformly

Zhu, Guangpu; Zhu, Lailai

doi:10.1017/jfm.2023.858

Cited by 9 publications

(2 citation statements)

References 91 publications

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“…This change is in reminiscent of the stationary-toswimming instability of an IPA with sufficient activity Pe. The theoretically predicted onset of instability for a single IPA 32,[55][56][57] provides inspiration for a prediction that characterizes the collective instability of our suspension.…”

Section: Phase Diagram and Theoretical Prediction Of The Solid-liquid...mentioning

confidence: 87%

“…The Marangoni interfacial flow is represented by a solute-induced tangential velocity at the surface of particles or disks. The simple concept makes it a popular reference model for researching the behavior of a single IPA 32,34,35,57 or a pair 82,83 . Most importantly, it retains the critical signature of an IPA, viz., exploiting the convection of a chemical product to sustain a Marangoni propelling flow upon spontaneous symmetrybreaking.…”

Section: Mathematical Model and Governing Equationsmentioning

confidence: 99%

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Shaping active matter from crystalline solids to active turbulence

Yang,

Jiang,

Picano

et al. 2024

Nat Commun

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Active matter drives its constituent agents to move autonomously by harnessing free energy, leading to diverse emergent states with relevance to both biological processes and inanimate functionalities. Achieving maximum reconfigurability of active materials with minimal control remains a desirable yet challenging goal. Here, we employ large-scale, agent-resolved simulations to demonstrate that modulating the activity of a wet phoretic medium alone can govern its solid-liquid-gas phase transitions and, subsequently, laminar-turbulent transitions in fluid phases, thereby shaping its emergent pattern. These two progressively emerging transitions, hitherto unreported, bring us closer to perceiving the parallels between active matter and traditional matter. Our work reproduces and reconciles seemingly conflicting experimental observations on chemically active systems, presenting a unified landscape of phoretic collective dynamics. These findings enhance the understanding of long-range, many-body interactions among phoretic agents, offer new insights into their non-equilibrium collective behaviors, and provide potential guidelines for designing reconfigurable materials.

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Section: Phase Diagram and Theoretical Prediction Of The Solid-liquid...mentioning

confidence: 87%

Section: Mathematical Model and Governing Equationsmentioning

confidence: 99%

Shaping active matter from crystalline solids to active turbulence

Yang,

Jiang,

Picano

et al. 2024

Nat Commun

Self Cite

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Electrocapillarity‐Induced Hurricane‐in‐a‐Tube Enables the Generation and Patterning of Liquid Metal Droplets

Song,

Tao,

Chen

et al. 2024

Adv Funct Materials

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Room‐temperature liquid metal droplets (LMDs) are a promising material for various applications in soft robotics, active droplets, and biomedical devices. However, controllable and high‐throughput production of LMDs remains challenging due to their high surface tension and density. Here, a novel strategy is presented to produce LMDs by combining electric field‐induced electrocapillary flow with an external flow field. The basic mechanism is that the electrocapillary flow induced at the LMD/electrolyte interface forms a vortex ring in the electrolyte, creating a hurricane‐like effect in the tube, which in turn causes the liquid metal to deform and eventually pinch off into small droplets. It is demonstrated that droplet size and generation frequency can be controlled precisely by adjusting the applied electric current, flow rate, and surfactant concentration, establishing a relationship between radius and experimental parameters through dimensionless analysis. More importantly, this strategy can handle pendant droplets and facilitate programmable droplet patterning. Leveraging established relationships, flexible control over droplet size and spacing during patterning is attained. Furthermore, an iontronic pressure‐sensitive device based on LMDs and hydrogel is developed to showcase the versatility of the approach. This technique opens up new opportunities for fabricating soft circuits, composite materials, and other functional devices with LMDs.

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Self‐propulsion of a droplet induced by combined diffusiophoresis and Marangoni effects

Wang,

Zheng,

2024

Electrophoresis

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Chemically active droplets display complex self‐propulsion behavior in homogeneous surfactant solutions, often influenced by the interplay between diffusiophoresis and Marangoni effects. Previous studies have primarily considered these effects separately or assumed axisymmetric motion. To understand the full hydrodynamics, we investigate the motion of a two‐dimensional active droplet under their combined influences using weakly nonlinear analysis and numerical simulations. The impact of two key factors, the Péclet number () and the mobility ratio between diffusiophoretic and Marangoni effects (), on droplet motion is explored. We establish a phase diagram in the space, categorizing the boundaries between four types of droplet states: stationary, steady motion, periodic/quasi‐periodic motion, and chaotic motion. We find that the mobility ratio does not affect the critical for the onset of self‐propulsion, but it significantly influences the stability of high‐wavenumber modes as well as the droplet's velocity and trajectory. Scaling analysis reveals that in the high regime, the Marangoni and diffusiophoresis effects lead to distinct velocity scaling laws: and , respectively. When these effects are combined, the velocity scaling depends on the sign of the mobility ratio. In cases with a positive mobility ratio, the Marangoni effect dominates the scaling, whereas the negative diffusiophoretic effect leads to an increased thickness of the concentration boundary layer and a flattened scaling of the droplet velocity.

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Self-propulsion of an elliptical phoretic disk emitting solute uniformly

Cited by 9 publications

References 91 publications

Shaping active matter from crystalline solids to active turbulence

Shaping active matter from crystalline solids to active turbulence

Electrocapillarity‐Induced Hurricane‐in‐a‐Tube Enables the Generation and Patterning of Liquid Metal Droplets

Self‐propulsion of a droplet induced by combined diffusiophoresis and Marangoni effects

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