【大学频道】北京大学量子材料科学中心呈献 | Hiroshi Onishi of Kobe University

原创 KouShare 蔻享学术

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图 | Hiroshi Onishi

题目：Pico-Newton force sensing at liquid-solid interfaces

报告人：Hiroshi Onishi

单位：Kobe University

时间：2019-12-11

地点：北京大学

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报告摘要

Frequency-modulation atomic force microscopy (FM-AFM) is a promising tool to observe solid topography and also liquid structure at liquid-solid interfaces. The cantilever with a tip is mechanically oscillated. The shift of the resonance frequency, Df, represents the force pushing or pulling the tip. Microscopes with a force sensitivity of 10 pN or better in water and organic solvents have been developed and commercialized to date. Using the advanced microscopes, we have examined structured liquids at a number of interfaces including water-CaCO₃, Al₂O₃, SrTiO₃, and hydrophilic molecular monolayers. The observed Df distributions are interpreted with water density distribution through Gibbs free energy perturbed by the solid surface. The force sensitivity of 10 pN is the key for probing force on single liquid molecules. Possible application of Df mapping to tribology research will also be mentioned.

个人简介

Hiroshi Onishi is a Professor in Department of Chemistry, School of Science, Kobe University. He obtained his PhD from The University of Tokyo in 1993, and was appointed as lecturer and associate professor of The University of Tokyo in 1996. In 1999, he was the leader of Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology. Since 2004, he has been a professor of Kobe University. Prof. Onishi was the pioneer of frequency-modulation Atomic Force Microscopy (FM-AFM) for atomic-resolution characterization of liquid-solid interfaces, which has been commercialized by Shimadzu Corp. He has received many awards for his achievements, such as Japan Society of Vacuum and Surface Science, Society Award (2019), Fellow of Surface Science Society of Japan (2010), Yazaki Award (2004), Surface Science Society of Japan, Technical Award (2003), Nano-probe Technology Award (2002), Young Scientist Award by Catalysis Society of Japan (2001), etc. Prof. Onishi is now the Program Officer of Japan Society for the Promotion of Science and serves Surface Science Report as one of the editors.