Manipulation and navigation of micro and nanoswimmers in different fluid environments can be achieved by chemicals, external fields, or even motile cells. Many researchers have selected magnetic fields as the active external actuation source based on the advantageous features of this actuation strategy such as remote and spatiotemporal control, fuel-free, high degree of reconfigurability, programmability, recyclability, and versatility. This review introduces fundamental concepts and advantages of magnetic micro/nanorobots (termed here as "MagRobots") as well as basic knowledge of magnetic fields and magnetic materials, setups for magnetic manipulation, magnetic field configurations, and symmetry-breaking strategies for effective movement. These concepts are discussed to describe the interactions between micro/nanorobots and magnetic fields. Actuation mechanisms of flagella-inspired MagRobots (i.e., corkscrew-like motion and traveling-wave locomotion/ciliary stroke motion) and surface walkers (i.e., surface-assisted motion), applications of magnetic fields in other propulsion approaches, and magnetic stimulation of micro/nanorobots beyond motion are provided followed by fabrication techniques for (quasi-)spherical, helical, flexible, wire-like, and biohybrid MagRobots. Applications of MagRobots in targeted drug/gene delivery, cell manipulation, minimally invasive surgery, biopsy, biofilm disruption/eradication, imaging-guided delivery/therapy/surgery, pollution removal for environmental remediation, and (bio)sensing are also reviewed. Finally, current challenges and future perspectives for the development of magnetically powered miniaturized motors are discussed.
|Number of pages||43|
|Publication status||Published - 2021 Apr 28|
Bibliographical noteFunding Information:
M.P. acknowledges the support from the project Advanced Functional Nanorobots (Reg. No. CZ.02.1.01/0.0/0.0/15_003/0000444 financed by the EFRR). S.P. acknowledges support from the ERC-2017-CoG HINBOTS Grant No. 771565. M.P. was supported by Ministry of Education, Youth and Sports (Czech Republic) Grant No. LL2002 under ERC-CZ program. L.Z. would like to thank the financial support from the Hong Kong Research Grants Council (RGC) under Project No. JLFS/E-402/18, the ITF Projects under Projects MRP/036/18X and ITS/374/18FP funded by the HKSAR Innovation and Technology Commission (ITC), the Hong Kong Croucher Foundation project under Ref. No. CAS20403, the Research Sustainability of Major RGC Funding Schemes, and the Direct Grant from CUHK, as well as support from the Multiscale Medical Robotics Center (MRC), InnoHK, at the Hong Kong Science Park.
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