时间: 2025年04月03日（周四）下午16:00-17:30

Time: 16:00-17:30, Thursday, April 3^rd, 2025

主持人: 西湖大学理学院PI 陈虹宇 博士

Host: Dr. Hongyu Chen, PI of School of Science, Westlake University

地址：西湖大学云谷校区E10-201

Venue: E10-201, Yungu Campus, Westlake University

讲座语言：英文

Lecture Language: English

Prof. Zhaoxiong Xie（谢兆雄）,

Department of Chemistry

Xiamen University

E-mail: zxxie@xmu.edu.cn

主讲人/Speaker:

Zhaoxiong Xie received his B.S. (1987) in Chemistry and his M.S. (1990) and Ph.D. (1995) in Physical Chemistry from Xiamen University, China. Since 2002, he has held the position of Professor of Chemistry at Xiamen University. His current research is focused on the surface/interface chemistry of functional nanocrystals. He has been devoted to develop new methodology and corresponding theory for the synthesis of thermodynamically metastable nanocrystals. He has been awarded the National Science Fund for Distinguished Young Scholars from NSFC (2007) and Changjiang Scholarship from MOE of China (2014). He used to be the director of the State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University) (2010-2014) and the dean of the College of Chemistry and Chemical Engineering of Xiamen University (2018-2024). He is now the fellow of Chinese Chemical Society, and the Associate Editor of Chinese Journal of Structural Chemistry.

讲座摘要/Abstract:

In addition to the most stable thermodynamic state, there are many forms of thermodynamic metastable nanocrystals, such as nanocrystals with exposed crystal facets with high surface energy, and nanocrystals with metastable bulk structure. However, there is no mature theory to guide the synthesis of metastable nanocrystals, and the thermodynamic metastable nanocrystals are usually synthesized by chance or trial and error in the experimental process. In this report, we focus on the researches of our group in the past ten years in the field of thermodynamic metastable nanocrystals, such as the controls of nanocrystals with exposed high energy surfaces and metastable bulk phase structures. Starting from the basic theory of thermodynamics of crystallization, we deduce that the surface energy of the exposed crystal facet of nanocrystals is positively correlated with the chemical potential of crystal growth units, and experiments show that the surface structure of nanocrystals can be well regulated by controlling the chemical potential of nanocrystals growth units (i.e., by controlling the supersaturation of the growth process). In addition, we propose and verify that the chemical potential of crystallization units can affect the bulk phase structure of crystal nuclei during the nucleation stage of nanocrystals. For example, we can control the formation of penta-twinned nanocrystals of some precious metals by simply controlling the reaction vessel, and so on.

讲座联系人/Contact:

理学院，石新玉，邮箱：shixinyu@westlake.edu.cn

School of Science, Xinyu Shi, Email: shixinyu@westlake.edu.cn