Electrophoresis of active Janus particles

Bayati, Parvin; Najafi, Ali

doi:10.1063/1.5101023

Cited by 18 publications

(9 citation statements)

References 94 publications

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“…Typically, the gradient of chemical potential is introduced by an asymmetric chemical activity that sustains gradients of solutes. For active colloids propelling by the generation of ionic species, the classic theory of phoresis [26,28] has been widely applied [29][30][31][32][33][34][35]. However, the theory of phoresis was developed to study the motion of colloids in weak gradients of electrolytes [28] and thin Debye layers [36].…”

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confidence: 99%

Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments

et al. 2020

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We study the self-propulsion of a charged colloidal particle that releases ionic species using theory and experiments. We relax the assumptions of thin Debye length and weak nonequilibrium effects assumed in classical phoretic models. This leads to a number of unexpected features that cannot be rationalized considering the classic phoretic framework: an active particle can reverse the direction of motion by increasing the rate of ions release and can propel even with zero surface charge. Our theory predicts that there are optimal conditions for self-propulsion and a novel regime in which the velocity is insensitive to the background electrolyte concentration. The theoretical results quantitatively captures the salt-dependent velocity measured in our experiments using active colloids that propel by decomposing urea via a surface enzymatic reaction.

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confidence: 99%

Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments

et al. 2020

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“…Different parts of microstructures can be polarized by AC electric fields, inducing electroosmotic flows that can be used to propel microrobots 239 , 240 . In addition, DC electric fields can be used to trigger chemical reactions on the side of a microparticle in order to generate a force gradient that can locomote microdevices 241 .…”

Section: Methodsmentioning

confidence: 99%

3D-printed microrobots from design to translation

et al. 2022

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Microrobots have attracted the attention of scientists owing to their unique features to accomplish tasks in hard-to-reach sites in the human body. Microrobots can be precisely actuated and maneuvered individually or in a swarm for cargo delivery, sampling, surgery, and imaging applications. In addition, microrobots have found applications in the environmental sector (e.g., water treatment). Besides, recent advancements of three-dimensional (3D) printers have enabled the high-resolution fabrication of microrobots with a faster design-production turnaround time for users with limited micromanufacturing skills. Here, the latest end applications of 3D printed microrobots are reviewed (ranging from environmental to biomedical applications) along with a brief discussion over the feasible actuation methods (e.g., on- and off-board), and practical 3D printing technologies for microrobot fabrication. In addition, as a future perspective, we discussed the potential advantages of integration of microrobots with smart materials, and conceivable benefits of implementation of artificial intelligence (AI), as well as physical intelligence (PI). Moreover, in order to facilitate bench-to-bedside translation of microrobots, current challenges impeding clinical translation of microrobots are elaborated, including entry obstacles (e.g., immune system attacks) and cumbersome standard test procedures to ensure biocompatibility.

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“…Micro/nanomotors could also be propelled by utilizing an external electric field. [73][74][75] Although there are many distinct advantages exhibited by the direct current (DC) electric field, [76] the alternating current (AC) electric field is more commonly applied so as to eliminate the electrophoresis. In AC electric fields, asymmetric micro/nano devices and diode motors are propelled by the potential energy produced through induced-charge electrophoresis (ICEP) and self-rectified electroosmosis respectively, which would be discussed in detail in the following sections.…”

Section: Electric Fieldmentioning

confidence: 99%

Recent Advances in Motion Control of Micro/Nanomotors

Yang

Zhong

et al. 2020

Advanced Intelligent Systems

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Micro/nanomotors are able to convert energy in different forms into propulsion and movement with predesigned directions and velocities, enabling them to be self‐propelled carriers and vehicles for the delivery of active pharmaceutical ingredients and other biomedical cargos to the target sites such as tumors. However, the inadequate energy and noncontrollable moving directions remain the grand challenges for their promising applications. Recently, an increasing attention has been paid to these issues and numerous reported researches have focused to design and develop more efficient and precisely controllable micro/nanomotors with different methods. This review aims to summarize those studies and to introduce newly developed micro/nanomotors including synthetic micro/nanomotors and biohybrid motors, discussing the control mechanisms as well as advantages and limitations thereof. Conclusions and future perspectives are also provided in brief.

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Electrophoresis of active Janus particles

Cited by 18 publications

References 94 publications

Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments

Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments

3D-printed microrobots from design to translation

Recent Advances in Motion Control of Micro/Nanomotors

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