Magnetically Actuated Rolling of Star‐Shaped Hydrogel Microswimmer

Hu, Narisu; Wang, Lefeng; Zhai, Wenhe; Sun, Mengmeng; Xie, Hui; Wu, Zhiguang; He, Qiang

doi:10.1002/macp.201700540

Cited by 41 publications

(41 citation statements)

References 30 publications

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“…In the field of nano/micromotors, the catalytic ability of Fe 3 O 4 NPs in H 2 O 2 is usually not utilized but the magnetic feature of Fe 3 O 4 NPs is the most common applied one. [ 37,81 ] With the application of a small magnetic field (strength ≈3 mT), Fe 3 O 4 Janus microspheres are oriented and their trajectories show a directionally deterministic motion (Figure 5b). By manipulating the orientation of a bar magnet, we can obtain complex trajectories and even write characters as demonstrated in Figure 5b where “F,” “D,” and “U” are written.…”

Section: Resultsmentioning

confidence: 99%

Hydrogel‐Based Janus Micromotors Capped with Functional Nanoparticles for Environmental Applications

Lin

Zhu

Zhao

et al. 2020

Adv Materials Technologies

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Janus nano/micromotors have been developed into various sizes, shapes, and functions for a blaze of applications especially in biomedical and environmental fields. Here, a fabrication method of Janus micromotors is reported by capping hydrogel microspheres with functional nanoparticles (NPs). Microspheres are prepared in droplet microfluidics relying on hydrogel polymerization to obtain spheres with diameters from 20 to 500 µm. By solidifying a hydrogel layer onto microspheres, functional NPs of MnO2 (catalyst of H2O2), TiO2 (photocatalyst), and Fe3O4 (magnetic guidance) are adhered onto microspheres resulting in Janus micromotors revealing different functionalities. Dynamics of Janus micromotors (diameter around 250 µm) are explored by analyzing their trajectories in terms of mean squared displacement when immersed in H2O2 solutions of different concentrations, illuminated by light and guided in an external magnetic field. TiO2 Janus micromotors perform well for water purification tasks as is exemplarily demonstrated with a degradation of Methylene Blue dye in water. The proposed fabrication method is versatile and enables to achieve adjustable coverage of a microsphere with NPs as well as to realize multifunctional Janus micromotors by adhering different NPs (e.g., MnO2 and Fe3O4) on a sphere. This method provides an attractive way to fabricate multifunctional Janus micromotors in a cost‐effective manner for environmental applications.

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Section: Resultsmentioning

confidence: 99%

Hydrogel‐Based Janus Micromotors Capped with Functional Nanoparticles for Environmental Applications

Lin

Zhu

Zhao

et al. 2020

Adv Materials Technologies

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“…For no special environmental properties such as conductivity or chemical cues are required, magnetic field is one of the most widely employed wireless actuation methods. Numerous instances of manipulation for microrobots through magnetic fields have been demonstrated (Pal et al 2018;Hu et al 2018;Kim et al 2013). Magnetic field is biocompatible even at relatively high strength owning to its great permeability.…”

Section: Microgripper Actuated By Magnetic Fieldmentioning

confidence: 99%

Untethered microgripper-the dexterous hand at microscale

Yin

Wei

Zhan

et al. 2019

Biomed Microdevices

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Untethered microgrippers that can navigate in hard-to-reach and unpredictable environments are significantly important for biomedical applications such as targeted drug delivery, micromanipulation, minimally invasive surgery and in vivo biopsy. Compared with the traditional tethered microgrippers, the wireless microgrippers, due to the exceptional characteristics such as miniaturized size, untethered actuation, dexterous and autonomous motion, are projected to be promising microtools in various future applications. In this review, we categorize the untethered microgrippers into five major classes, i.e. microgrippers responsive to thermal, microgrippers actuated by magnetic fields, microgrippers responsive to chemicals, light-driven microgrippers and hybrid actuated microgrippers. Firstly, the actuation mechanisms of these microgrippers are introduced. The challenges faced by these microgrippers are also covered in this part. With that, the fabrication methods of these microgrippers are summarized. Subsequently, the applications of microgrippers are presented. Additionally, we conduct a comparison among different actuation mechanisms to explore the advantages and potential challenges of various types of microgrippers. In the end of this review, conclusions and outlook of the development and potential applications of the microgrippers are discussed.

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“…Furthermore, inspired by animals, many biomimetic robots have been fabricated based on bulk hydrogels . For example, the swimming bladders of fish inspired soft robots containing rGO displaying “standing” and “walking” motions under NIR laser stimuli, as shown in Figure c .…”

Section: Applications Of Nanocomposite Hydrogelsmentioning

confidence: 99%

“…Furthermore, inspired by animals, many biomimetic robots have been fabricated based on bulk hydrogels. [126,183] For example, the swimming bladders of fish inspired soft robots containing rGO displaying "standing" and "walking" motions under NIR laser stimuli, as shown in Figure 16c. [126] The density of the robot was changeable via the melting/crystallizing transition of the polymer, which was induced by variations in temperature.…”

Section: Soft Robotsmentioning

confidence: 99%

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

Chen

Hou

Ren

et al. 2018

Macromol. Rapid Commun.

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Hydrogels are an important class of soft materials with high water retention that exhibit intelligent and elastic properties and have promising applications in the fields of biomaterials, soft machines, and artificial tissue. However, the low mechanical strength and limited functions of traditional chemically cross-linked hydrogels restrict their further applications. Natural materials that consist of stiff and soft components exhibit high mechanical strength and functionality. Among artificial soft materials, nanocomposite hydrogels are analogous to these natural materials because of the synergistic effects of nanoparticle (NP) polymers in hydrogels construction. In this article, the structural design and properties of nanocomposite hydrogels are summarized. Furthermore, along with the development of nanocomposite hydrogel-based devices, the shaping and potential applications of hydrogel devices in recent years are highlighted. The influence of the interactions between NPs and polymers on the dispersion as well as the structural stability of nanocomposite hydrogels is discussed, and the novel stimuli-responsive properties induced by the synergies between functional NPs and polymeric networks are reviewed. Finally, recent progress in the preparation and applications of nanocomposite hydrogels is highlighted. Interest in this field is growing, and the future and prospects of nanocomposite hydrogels are also reviewed.

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Magnetically Actuated Rolling of Star‐Shaped Hydrogel Microswimmer

Cited by 41 publications

References 30 publications

Hydrogel‐Based Janus Micromotors Capped with Functional Nanoparticles for Environmental Applications

Hydrogel‐Based Janus Micromotors Capped with Functional Nanoparticles for Environmental Applications

Untethered microgripper-the dexterous hand at microscale

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

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