Multiple roles of palladium-coated magnetic anisotropic particles as catalysts, catalyst supports, and micro-stirrers

Xia, Ming; Kim, Kyung Hak; Lee, Jongwon; Go, Eun Min; Yu, Taekyung; Kwak, Sang Kyu; Na, Hyon Bin; Park, Bum Jun

doi:10.1016/j.cej.2018.01.084

Cited by 26 publications

(6 citation statements)

References 54 publications

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“…Inspired by biological motors, which can convert chemical fuels to mechanical motions for maintaining and regulating biological functions, there has been extensive growth in the fabrication of colloid motors with self-propelled or externally propelled behavior. − Colloid motors are attractive candidates to perform tough tasks such as cargo delivery, − reaction efficiency enhancement, , and intelligent response, which render them potentially attractive in the fields of biology, − environment, − sensing display, − etc. Recently, tremendous interests were evoked primarily in pioneering hard solid colloids, − and the remote control of translational motion was enabled by early reports of Kim and Yang et al by the introduction of complex surfaces of solid microparticles .…”

Section: Introductionmentioning

confidence: 99%

Controlled Group Motion of Anisotropic Janus Droplets Prepared by One-Step Vortex Mixing

Cheng

Sun

et al. 2020

ACS Appl. Mater. Interfaces

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In living systems, highly efficient biological micromotors are fascinating and crucial to the maintenance and regulation of normal functions. Inspired by this, solid colloid motors with controlled movements were recently developed for diverse applications. However, to meet the requirements of more elaborate functionalities, the development of droplet-based micromotors, which feature with appealing advantages such as deformability, encapsulation capability, and biocompatibility, is demanding. Herein, responsive Janus droplets with intrinsic magnetic anisotropy were fabricated, taking advantage of the traditional one-step vortex mixing that guarantees large-scale production. Furthermore, the size range of the droplets can be easily extended continuously from hundreds of micrometers down to tens of nanometers. What is more appealing, directed in situ group motions that include alignment, rotation, and transfer of the Janus droplets prepared were successfully realized and precisely controlled by using an external magnetic field. These collective motions induced excellent performances in pollutant adsorption and separation, switchable conductivities, and the size grading. Such scalable, simple, and controllable strategy can expand the application of Janus emulsions to complicated fields of microreactors, microsensors, and environmental regulation.

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Section: Introductionmentioning

confidence: 99%

Controlled Group Motion of Anisotropic Janus Droplets Prepared by One-Step Vortex Mixing

Cheng

Sun

et al. 2020

ACS Appl. Mater. Interfaces

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“…Based on the ratio between these time scales τ υ /τ D ∼ D / L υ, one can conclude that the mixing intensifies significantly with an increase in the velocity. Due to this, superfast micromotors can be efficiently used as a microstirrer. , The brilliant blue dye is added to the emulsion to study the process of mixing. Experimental results show that superfast active droplets stir the mixture efficiently (Figure , Movie S7).…”

Section: Resultsmentioning

confidence: 99%

“…Due to this, superfast micromotors can be efficiently used as a microstirrer. 69,70 The brilliant blue dye is added to the emulsion to study the process of mixing. Experimental results show that superfast active droplets stir the mixture efficiently (Figure 6, Movie S7).…”

Section: Resultsmentioning

confidence: 99%

Superfast Active Droplets as Micromotors for Locomotion of Passive Droplets and Intensification of Mixing

Kichatov

Korshunov

Sudakov

et al. 2021

ACS Appl. Mater. Interfaces

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Micromotors are fascinating objects that are able to move autonomously and perform various complex tasks related to drug delivery, chemical processes, and environmental remediation. Among the types of micromotors, droplet-based micromotors are characterized by a wide range of functional properties related to the capability of encapsulation and deformation and the possibility of using them as microreactors. Relevant problems of micromotor utilization in the chemical processes include intensification of mixing and locomotion of passive objects. In this paper, the technique for preparation of superfast active droplets, which can be used as micromotors for effective locomotion of passive droplets in the oil-in-water emulsion, is demonstrated. The possibility of passive droplet locomotion in the emulsion is determined by a relation between the diameters of active and passive droplets. If the diameter of active droplets is larger than the diameter of passive droplets, the agglomerates form spontaneously in the emulsion and move in a straight line. In the case of the opposite relation between diameters, the agglomerates consisting of active and passive droplets rotate intensively. This makes it impossible to move the passive droplets to a given distance. Such micromotors can achieve unprecedentedly high velocities of motion and can be used to intensify mixing on the microscales.

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“…Thereby, magnetic manipulation of these particles allows their magnetophoretic mobility in a liquid carrier medium to promote their orientation along the magnetic field lines as well as their assembly into well-defined structures depending on their morphology, size, and physicochemical properties. Remote manipulation of the particles by a magnetic field makes them ideal to build functional devices for a wide range of applications such as micro-or nanomotors, [10] electric paper pixels, [11] targeted drug delivery, [12] surfactants for Pickering emulsions, [13] microstirrers, [14] water treatment, [15] etc. They can also be assembled into complex structures like non close-packed lattices and lowcoordination architectures.…”

Section: Introductionmentioning

confidence: 99%

Particles with Magnetic Patches: Synthesis, Morphology Control, and Assembly

Yammine

Souaïd

Youssef

et al. 2020

Part & Part Syst Charact

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The concept of patchy particles is revolutionizing the research field of colloidal assembly, by the design of particles whose surface is purposely patterned to promote attractive interactions with their neighbors in limited number, and in privileged and programmed directions. The idea of magnetic patches makes it possible to imagine assemblies not only spontaneous by simple magnetic coupling but also triggered and canceled at will due to external magnetic fields. This review shows that studies published until now mainly deal with particles with a single magnetic patch, often called Janus particles. The very diverse synthetic routes have been brought together into four main strategies, covering the size range from 100 nm to 100 µm. Their assembly capacity is described both from experimental and simulation viewpoints. The orientation of the magnetic moment of the patch and its decentering extent with respect to the particle are the key parameters for controlling the morphology of clusters, loops, staggered chains, double chains, helices, microtubes, etc. The review offers some perspectives to generalize these studies to multipatch particles, examples of which are still too rare, and to make assemblies sustainable, especially after the removal of the structuring magnetic fields.

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Multiple roles of palladium-coated magnetic anisotropic particles as catalysts, catalyst supports, and micro-stirrers

Cited by 26 publications

References 54 publications

Controlled Group Motion of Anisotropic Janus Droplets Prepared by One-Step Vortex Mixing

Controlled Group Motion of Anisotropic Janus Droplets Prepared by One-Step Vortex Mixing

Superfast Active Droplets as Micromotors for Locomotion of Passive Droplets and Intensification of Mixing

Particles with Magnetic Patches: Synthesis, Morphology Control, and Assembly

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