2026-04-24 北海道大学
＜関連情報＞
- https://www.hokudai.ac.jp/news/2026/04/post-2267.html
- https://www.hokudai.ac.jp/news/pdf/260424_pr4.pdf
- https://iopscience.iop.org/article/10.1088/1674-1056/ae5db4
応力によって生じる流動下のメカノケミカル反応の律速過程のクロスオーバーCrossover of limiting processes in mechanochemical reactions under flow driven by applied mechanical stress
Tetsuya Yamamoto, Koji Kubota, Yu Harabuchi, Julong Jiang and Hajime Ito
Chinese Physics B Published:10 April 2026
DOI:10.1088/1674-1056/ae5db4
Abstract
Mechanochemical organic synthesis using ball milling leverages mechanical energy to drive chemical reactions. A comprehensive understanding of the underlying reaction kinetics is essential for the continuous development of mechanochemical synthesis. However, the rate-limiting processes of mechanochemical reactions remain poorly understood because molecular behavior at interfacial length scales is still largely unknown. We have theoretically predicted that the mechanochemical reactions of two solid reactants form a layer of phase rich in products at their interface due to the instability arising from the immiscibility of products and reactant solids and that the applied mechanical stress accelerates the diffusion of reactants through the product-rich layer by decreasing the thickness of this layer. To shed the light in the rate-limiting processes governing such mechanochemical reactions, we here develop a scaling theory. This theory predicts that the rate-limiting process depends on the thickness of the product-rich layer and can therefore change overtime. Unlike conventional solution-based reactions, the crossover between regimes of rate-limiting process is influenced not only by the diffusion length but also by the extent of reactant dissolution into the product-rich layer and magnitude of the applied mechanical stress. The model developed in this study provides a fundamental framework for a deeper understanding of mechanochemical organic reactions occurring during ball milling.
