The University of Tokyo · Engineering
Professor Junho Choi's research lab specializes in advanced tribological materials and surface engineering, focusing on the development of smart, self-sensing, and self-lubricating systems for high-performance mechanical and electronic applications. Key research directions include the design of diamond-like carbon (DLC) and amorphous carbon-based coatings with tailored microstructures for enhanced wear resistance and low friction, the integration of self-powered sensing via triboelectric nanogenerators in mechanical components such as bearings, and the optimization of ultrathin lubricant films for magnetic storage devices. The lab also investigates surface modification techniques, including plasma treatment and self-assembled monolayers, to control interfacial properties at the nanoscale.
Figures are computed from collected data and may differ slightly.
Abstract With the rapid development of the Internet of Things and artificial intelligence (AI), the requirement for sensing technologies for smart bearings has increased dramatically. The general bearing sensors can only recognize the basic information from temperature or vibration, far from satisfying the self‐diagnosis and self‐maintenance. Recently, self‐powered sensing technologies based on triboelectric nanogenerators have paved a new route for fabricating smart bearings. In this study, the
Self-assembled monolayers (SAMs) of 1H,1H,2H,2H-perfluorodecyltriethoxysilane were deposited on the magnetic hard disk surface by immersion. SAM formation was confirmed by contact angle measurement, ellipsometry, and x-ray photoelectron spectroscopy. Friction of unlubricated, SAM-coated, and perfluoropolyether (PFPE) Zdol-coated disk surfaces was measured with lateral force microscopy, spin-stand tester, and scratch tester. The SAM-coated disk surfaces had lower friction as compared to the unlub
Abstract In the present study, the effects of silicon oxide layer of Si‐DLC coatings on the tribological properties were investigated. The Si‐DLC coatings were deposited on Si substrates using a bi‐polar type plasma‐based ion implantation and deposition technique (bi‐polar type PBII&D), and the surface of the Si‐DLC coating was treated by oxygen plasma for 180 seconds. The friction coefficient of the Si‐DLC coatings is effectively reduced due to the treatment of oxygen plasma whereas the wea
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