Abstract
Various shapes of magnetically-programmed polyethylene glycol (PEG)-based particles with Fe3O4 blocks were harvested by a facile reaping method. Specifically, elastic PEG-based particles can be obtained by applying uniform shear stress onto the array of densely-populated PEG/Fe3O4 microstructures. A simple theory based on geometric and material properties was developed based on experimental observations to produce highly uniform cylindrical microparticles in a cost-effective manner. We analyzed the force balance of hairy architectures to explain the uniform cutting process, which is based on operating zones with various geometries and material elasticity. Here, the alignments of mono-/multi-dispersed iron oxide (Fe3O4) in microparticles can be tunable by changing the external magnetic field during replications. Furthermore, the collective reversible motions of different magneto-responsive PEG particles were observed when the external magnetic field was controlled, wherein such behaviors can be applied in potential medial applications such as controllable drug-delivery or microrobotics.
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Acknowledgments: This research was supported by a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI15C2806010017).
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Min, H., Choi, Y., Kim, J. et al. Magnetically-Programmable Cylindrical Microparticles by Facile Reaping Method. Macromol. Res. 26, 1108–1114 (2018). https://doi.org/10.1007/s13233-018-6153-6
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DOI: https://doi.org/10.1007/s13233-018-6153-6