摩擦を原子レベルで初めて可視化。 New Research Published in Nature Nanotechnology Unveils First Visualization of Friction at the Atomic Level
2022-07-25 ピッツバーグ大学
これまで誰も、原子レベルで分解された摩擦プロセスを、はっきりとした界面で実際に見ることができなかったので、摩擦メカニズムと界面の関係は十分に理解されていませんでしたが、この研究では、これまでシミュレーションによってのみ示されていた、界面原子の滑り経路と、界面における動的なひずみと応力の変化を実際に見ることができた。
＜関連情報＞
- https://news.engineering.pitt.edu/understanding-friction-the-unavoidable-enemy/
- https://www.nature.com/articles/s41565-022-01126-z
透過型電子顕微鏡による単一アスペリティコンタクトの原子スケールでの摩擦の解明 Atomic-scale friction between single-asperity contacts unveiled through in situ transmission electron microscopy
Xiang Wang,Zhenyu Liu,Yang He,Susheng Tan,Guofeng Wang & Scott X. Mao
Nature Nanotechnology Published:23 May 2022
DOI:https://doi.org/10.1038/s41565-022-01126-z
Abstract
Friction and wear are detrimental to functionality and reduce the service life of products with mechanical elements. Here, we unveil the atomic-scale friction of a single tungsten asperity in real time through a high-resolution transmission electron microscopy investigation of a nanocontact in countermotion, induced through a piezo actuator. Molecular dynamics simulations provide insights into the sliding pathway of interface atoms and the dynamic strain/stress evolution at the interface. We observe a discrete stick–slip behaviour and an asynchronous process for the accumulation and dissipation of the strain energy together with the non-uniform motion of interface atoms. Our methodology allows for studying in situ atomic-friction phenomena and provides insights into friction phenomena at the atomic scale.
