Hidden pathways in molecular and colloidal self-assembly revealed through the development of in situ characterization methods

2019年03月18日

报告题目:Hidden pathways in molecular and colloidal self-assembly revealed through the development of in situ characterization methods

报告人:王宇博士, 美国加州大学伯克利分校

时间:2019-03-25 16:00

地点:卢嘉锡楼202报告厅

报告摘要:

Molecular and colloidal self-assembly has been recognized as an important “bottom-up” approach to constructing functional materials and self-organized systems for various applications. An understanding of the self-assembly pathways is significant for designing routes to the desired structures and the emergence of novel properties. However, it remains a great challenge to unveil the hidden pathways and translate states during self-assembly due to the difficulty of in situ characterizations, especially in complex hierarchical and/or multi-component systems. In this talk, we report our developments on in situ characterization methods and their effectiveness in revealing the hidden pathways during molecular and colloidal self-assembly. For instances, using in situ combined spectroscopies, we elucidate the transient structures during the self-assembly of organic cages and provide deep insights into the chiral amplification in multi-component supramolecular systems. Through a variety of in situ studies on molecular assembly, we discover and establish a new assembly mode that we name catalyzed assembly (catassembly) for its resemblance to catalysis. Finally, we highlight our discovery of the dynamic deformation of individual PbSe nanocrystals during colloidal assembly into superlattice through in-situ liquid-phase TEM. We show an unprecedented phenomenon that inorganic semiconductors are “soft materials” at the nanoscale. The discovery is significant not only for the designing of nanocrystals and nanocrystal architectures with desired properties for various applications, but also for controlling the physical and chemical processes of a wide range of matter at the atomic or nanometric level.

报告人简介:

王宇博士于2009年毕业于南京大学基础学科强化部获得化学学士学位,于2016年毕业于厦门大学化学系获得博士学位。2016年5月至2017年8月在美国阿克伦大学从事博士后研究。2017年8月至今在美国加州大学伯克利分校从事博士后研究。长期从事分子与纳米粒子可控组装的方法学发展以及组装原位表征技术发展。利用原位光谱、原位X射线衍射、原位透射电子显微镜研究小分子、高分子、生物大分子、金属或半导体纳米粒子的组装行为和组装产物功能。已发表SCI论文15篇,其中以第一/共同第一作者或通讯作者发表论文9篇,包括三篇Nature Commun.以及 Chem. Soc. Rev.、JACS等顶级刊物。