【学术报告】赵辉：Mechanosensitive Non-equilibrium Supramolecular Polymerization in Closed Chemical Systems

Mechanosensitive Non-equilibrium Supramolecular Polymerization in Closed Chemical Systems

今邀请四川大学化学工程学院赵辉教授来我校进行学术访问并作学术报告，届时将与我校有关专家学者进行学术交流。欢迎广大师生踊跃参加！

报告题目：Mechanosensitive Non-equilibrium Supramolecular Polymerization in Closed Chemical Systems

报告时间：2023年4月17日（周一）16:00-17:00

报告地点：13号教学楼404室

附件：赵辉教授简介

科学技术处

化学化工学院

2023年04月14日

赵辉教授简介

赵辉，四川大学化学工程学院特聘教授，博士生导师，国家海外青年高层次人才，四川大学“双百人才计划”入选者。2013年毕业于德国汉堡大学高分子所，之后在以色列魏茨曼科学院和荷兰奈梅亨大学做博士后研究，2017-2020年在电子科技大学基础与前沿研究院工作，2020年初加入四川大学化工学院。研究兴趣包括材料合成生物学、分子组装和系统化学、基于活性酯化学的纳滤膜等，在Nature Nanotech.、Nature Chem.、Adv. Mater.、Macromolecules等国际知名学术期刊上发表论文40余篇，SCI他引2800余次，单篇最高引用400余次，4篇入选ESI高被引论文。担任J. Macromolecular Science Part A期刊副主编，Polymers期刊客座编辑。

报告摘要

Inspired by biofuel-driven dissipative self-assembly in nature, chemical fuel-driven supramolecular systems have been developed showing out-of-equilibrium functions such as transient gelation and oscillations. However, these systems suffer from undesired waste accumulation and they function only in open systems. In this talk, I will share our recent discovery on non-equilibrium supramolecular polymerizations in closed chemical systems. The system is built by viologens and pyranine in the presence of hydrazine hydrate. On shaking, the viologens were quickly activated by oxidation by air followed by self-assembly of pyranine into micrometer-sized nanotubes. The self-assembled nanotubes disassembled spontaneously over time by the reduced agent, with nitrogen as the only waste product. The dissipative supramolecular polymerization could be repeated at least 6 times even in a closed system. Our mechanosensitive dissipative self-assembly process could be extended to fabricate chiral transient supramolecular helix by introducing chiral charged small molecules into the system. More specifically, we show that shaking could induce transient fluorescence enhancement or quenching depending on substitution of viologens. Ultrasound was introduced as a specific shake way to generate template-free reproducible patterns.