Spatially Selective Ultraprecision Polishing and Cleaning by Collective Behavior of Micro Spinbots

• Published in: Small structures 2024-11, Vol.5 (11), p.n/a
• Main Authors: Je, Hyeongmin, Won, Sukyoung, Wie, Jeong Jae, Kim, Sanha
• Format: Article
• Language: English
• Subjects: Actuation; Cleaning; Contaminants; Iron oxides; magnetic actuation; Magnetic devices; Microrobots; Nanocomposites; Polishing; Polyurethane resins; Soft robotics; Sweeping; untethered miniaturized robots; Urethane thermoplastic elastomers; Workpieces
• ISSN: 2688-4062; 2688-4062
• DOI: 10.1002/sstr.202400245

Untethered magnetic actuation is an attractive technique for controlling a batch of micrometer‐sized soft robots. Recent advancements have enabled each robot to follow its path independently using a single magnetic device. However, applications of magnetic soft microrobots are mostly biased toward the biomedical field. In this study, thermoplastic polyurethane–Fe3O4 nanocomposite soft spinning microrobots, that is, spinbots that actuate on a tabletop magnetic stirrer, were utilized as innovative precision manufacturing tools for spatially selective precision polishing and cleaning. The pivot motion of the revolving spinbots, which involves repetitive sweeping during rotation cycles, is explored. This sweeping action physically removes nanometer‐sized surface contaminants from the workpiece, achieving a cleaning efficiency of 99.6%. Multiple spinbots, up to 42 in total, simultaneously operated along their own orbital pathways on three vertically stacked wafers, thereby demonstrating an unprecedented cleaning method. In addition, the spinbots precisely removed materials from the workpiece using a three‐body abrasion mechanism. Furthermore, the spinbots contributed to precise material removal, resulting in remarkable surface polishing (R a ≈ 1.8 nm). This novel polishing system, which uses the collective behavior of multiple spinbots on a tabletop magnetic stirrer, is 1000‐fold lighter than current state‐of‐the‐art equipment aimed at achieving similar levels of fine finishing. Polyurethane–Fe3O4 nanocomposite microrobots, called spinbots, are utilized for precise polishing and cleaning. Multiple microrobots pivot along their trajectories which can sweep to remove nanometer‐sized surface contaminants, achieve 99.6% cleaning efficiency, or polish a copper with a fine surface of R a ≈ 1.8 nm. More than 40 spinbots can operate simultaneously on vertically stacked wafers and are spatially restricted when necessary.