Magnetically-Programmable Cylindrical Microparticles by Facile Reaping Method

• Published in: Macromolecular research Vol. 26; no. 12; pp. 1108 - 1114
• Main Authors: Min, Hyeongho, Choi, Youngjin, Kim, Jaeyun, Kim, Jungwook, Pang, Changhyun
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.12.2018; Springer Nature B.V; 한국고분자학회
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Cost analysis; Drug delivery systems; Elasticity; Iron oxides; Magnetic fields; Material properties; Microparticles; Nanochemistry; Nanotechnology; Operating zones; Physical Chemistry; Polyethylene glycol; Polymer Sciences; Shear stress; Soft and Granular Matter; Stability; 고분자공학; magnetic particle; deflection force; microstructure; composite; microparticle
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-018-6153-6

Various shapes of magnetically-programmed polyethylene glycol (PEG)-based particles with Fe 3 O 4 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/Fe 3 O 4 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 (Fe 3 O 4 ) 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.