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3D Fabrication of Fully Iron Magnetic Microrobots

Title
3D Fabrication of Fully Iron Magnetic Microrobots
Authors
Alcantara, Carlos C. J.Kim, SangwonLee, SunkeyJang, BumjinThakolkaran, PrakashKim, Jin-YoungChoi, HongsooNelson, Bradley J.Pane, Salvador
DGIST Authors
Kim, Jin-YoungChoi, Hongsoo
Issue Date
2019-04
Citation
Small, 15(16)
Type
Article
Article Type
Article
Author Keyword
magnetic microrobots; template-assisted deposition; upstream motion; direct laser writing; iron electrodeposition
Keyword
Biocompatibility; Diseases; Electrodeposition; Electrodes; Fabrication; Geometry; Iron; Magnetic susceptibility; Molds; Saturation magnetization; Two photon processes; Direct laser writing; Iron electrodeposition; Magnetic microrobots; Template assisted deposition; upstream motion; 3D printers
ISSN
1613-6810
Abstract
Biocompatibility and high responsiveness to magnetic fields are fundamental requisites to translate magnetic small-scale robots into clinical applications. The magnetic element iron exhibits the highest saturation magnetization and magnetic susceptibility while exhibiting excellent biocompatibility characteristics. Here, a process to reliably fabricate iron microrobots by means of template-assisted electrodeposition in 3D-printed micromolds is presented. The 3D molds are fabricated using a modified two-photon absorption configuration, which overcomes previous limitations such as the use of transparent substrates, low writing speeds, and limited depth of field. By optimizing the geometrical parameters of the 3D molds, metallic structures with complex features can be fabricated. Fe microrollers and microswimmers are realized that demonstrate motion at ≈20 body lengths per second, perform 3D motion in viscous environments, and overcome higher flow velocities than those of “conventional 3D printed helical microswimmers.” The cytotoxicity of these microrobots is assessed by culturing them with human colorectal cancer (HCT116) cells for four days, demonstrating their good biocompatibility characteristics. Finally, preliminary results regarding the degradation of iron structures in simulated gastric acid liquid are provided. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/9858
DOI
10.1002/smll.201805006
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Choi, Hongsoo Bio-Micro Robotics Lab
  • Research Interests Micro/Nano robot; Neural prostheses; MEMS; BMI; MEMS/NEMS; BioMEMS; MEMS 초음파 트랜스듀스; 인공와우
Files:
There are no files associated with this item.
Collection:
Department of Robotics EngineeringBio-Micro Robotics Lab1. Journal Articles


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