Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields

Lee, Jin Gyun; Thome, Cooper P.; Cruse, Zoe A.; Ganguly, Arkava; Gupta, Ankur; Shields, C. Wyatt

doi:10.1039/d3nr03744d

Cited by 3 publications

(5 citation statements)

References 68 publications

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“…In Raj et al (2023a), the authors investigated the combination of chemical and mechanical modes of swimming simultaneously, and noted that even reciprocal strokes yield nonreciprocal displacement when both modes are employed simultaneously. Similar investigations with other modes of activation such as electric fields and magnetic fields could provide improved control over particle trajectories (Lee et al, 2023a).…”

Section: Future Opportunitiesmentioning

confidence: 92%

Diffusiophoresis: a novel transport mechanism - fundamentals, applications, and future opportunities

Ganguly,

Alessio,

Gupta

2023

Front. Sens.

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Diffusiophoresis involves the movement of colloidal-scale entities in response to concentration gradients of a solute. It is broadly categorized into two types: passive and active diffusiophoresis. In passive diffusiophoresis, external concentration gradients drive the motion, while in active diffusiophoresis, the colloidal entity itself assists in generating the gradients. In this perspective, we delve into the fundamental processes underlying passive and active diffusiophoresis and emphasize how prevalent both kinds of diffusiophoresis are in colloidal and natural systems. In particular, we highlight the colloidal focusing feature in passive diffusiophoresis and discuss how it underpins the variety of experimental observations and applications such as low-cost zetasizers, water filtration, and biological pattern formation. For active diffusiophoresis, we emphasize the dependence of particle trajectory on its shape and surface heterogeneity, and discuss how this dictates the applications such as drug delivery, removal of microplastics, and self-repairing materials. Finally, we offer insights and ideas regarding future opportunities in diffusiophoresis.

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Section: Future Opportunitiesmentioning

confidence: 92%

Diffusiophoresis: a novel transport mechanism - fundamentals, applications, and future opportunities

Ganguly,

Alessio,

Gupta

2023

Front. Sens.

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“…ii) Modes of motion for MNRs: In addition to conventional field-guided motion, MNRs can exhibit a diverse range of motion patterns based on their design. Under external field stimulation, these robots can achieve rotation, translation, and helical propulsion, among other modes (Lee et al, 2023). For electro-controlled selfpropelled MNRs, specific motion behaviors can be achieved through the design of structures such as Janus particles, which exploit distinct hemisphere configurations (Shen et al, 2020).…”

Section: Fabrication Of Electrocontrolled Mnrsmentioning

confidence: 99%

“…This is because, in an electric field, the metal hemisphere of a Janus particle polarizes more strongly than the dielectric hemisphere, resulting in a higher electro-osmotic strength on the metal side. Lee et al Lee et al (2023) applied an external alternating electric field to a cluster of Janus particles and demonstrated the diverse motion modes generated by ICEP, showcasing its rich potential.…”

Section: Mnrs Manipulated By Induced Charge Electrophoresismentioning

confidence: 99%

“…However, when MNRs move collectively, they can demonstrate a wider range of motion patterns. Lee et al (2023) utilized asymmetric Janus particle clusters to achieve five different states of motion: translation, rotation, butterfly pattern, spiral, and orbital motion. This enables electrically controlled MNRs to have enhanced motion capabilities in complex three-dimensional environments.…”

Section: Motion Modes Of Electrically Controlled Mnrsmentioning

confidence: 99%

“…Janus particles with distinct dielectric properties have emerged as a highly promising choice for electrically controlled MNRs. These particles possess induced charges and an asymmetric distribution of electric dipole s (Demirörs et al, 2018), enabling their propulsion and manipulation through ICEP (Lee et al, 2023), Lee et al (2023) discovered that magnetic locking assemblies of metallic-dielectric Janus particles exhibit five distinct motion states under the influence of ICEP, with four of them achievable using Janus dimers alone. Furthermore, the asymmetric nature of Janus particles leads to an imbalanced electrokinetic flow on both sides of the particle (Ma et al, 2015), endowing them with self-propulsion capabilities.…”

Section: Applications Of Janus Particles In Electrically Controlled Mnrsmentioning

confidence: 99%

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Current status and future application of electrically controlled micro/nanorobots in biomedicine

Pu,

Yang,

et al. 2024

Front. Bioeng. Biotechnol.

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Using micro/nanorobots (MNRs) for targeted therapy within the human body is an emerging research direction in biomedical science. These nanoscale to microscale miniature robots possess specificity and precision that are lacking in most traditional treatment modalities. Currently, research on electrically controlled micro/nanorobots is still in its early stages, with researchers primarily focusing on the fabrication and manipulation of these robots to meet complex clinical demands. This review aims to compare the fabrication, powering, and locomotion of various electrically controlled micro/nanorobots, and explore their advantages, disadvantages, and potential applications.

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Unified mobility expressions for externally driven and self-phoretic propulsion of particles

Ganguly,

Roychowdhury,

Gupta

2024

J. Fluid Mech.

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The mobility of externally driven phoretic propulsion of particles is evaluated by simultaneously solving the solute conservation equation, interaction potential equation and the modified Stokes equation. While accurate, this approach is cumbersome, especially when the interaction potential decays slowly compared with the particle size. In contrast to external phoresis, the motion of self-phoretic particles is typically estimated by relating the translation and rotation velocities with the local slip velocity. While this approach is convenient and thus widely used, it is only valid when the interaction decay length is significantly smaller than the particle size. Here, by taking inspiration from Brady (J. Fluid Mech., vol. 922, 2021, A10), which combines the benefits of two approaches, we reproduce their unified mobility expressions with arbitrary interaction potentials and show that these expressions can conveniently recover the well-known mobility relationships of external electrophoresis and diffusiophoresis for arbitrary double-layer thickness. Additionally, we show that for a spherical microswimmer, the derived expressions relax to the slip velocity calculations in the limit of the thin interaction length scales. We also employ the derived mobility expressions to calculate the velocities of an autophoretic Janus particle. We find that there is significant dampening in the translation velocity even when the interaction length is an order of magnitude larger than the particle size. Finally, we study the motion of a catalytically self-propelled particle, while it also propels due to external concentration gradients, and demonstrate how the two propulsion modes compete with each other.

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Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields

Abstract: Magnetically assembled Janus particles display orientation-dependent motions in AC electric fields. The regimes of motion are studied by experiments and modeling to understand and inform future microrobot design.

Cited by 3 publications

References 68 publications

Diffusiophoresis: a novel transport mechanism - fundamentals, applications, and future opportunities

Diffusiophoresis: a novel transport mechanism - fundamentals, applications, and future opportunities

Current status and future application of electrically controlled micro/nanorobots in biomedicine

Unified mobility expressions for externally driven and self-phoretic propulsion of particles

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