SEMINAR

Shanghai Institute of Ceramics, Chinese Academy of Sciences

中国科学院上海硅酸盐研究所 

On the Inhomogeneity in the Silica Shells from Stober methods 

Speaker

Professor Hongyu Chen

Nanyang Technological University, Singapore 

时间：2012年5月4日（星期五）上午10:00

地点：2号楼607会议室

联系人：朱英杰研究员

欢迎各位老师和同学参加!

Abstract

The talk will consist of two parts. I will start by giving a brief summary of the research done in my lab, before focusing on controlling silica nanostructures. Structural control of nanomaterials is of paramount significance for optimizing the properties and functions of nanodevices. Through the mechanistic study of nanostructure formation, we can develop new synthetic methodology and move towards rational design and synthesis of more complex structures. I will highlight the concept, strategy, and scope of our works in the past 5 years, by quickly running through about 20 projects. In the second part, I will focus on the detailed mechanisms of controlling silica shells. We show that the sequential hydrolysis of TEOS in the traditional Stober methods probably leads to inhomogeneous composition in the resulting silica shells. Such inhomogeneity can be exploited for facile synthesis of multi-layer yolk-shell motives. I will also discuss the synthesis of Janus (two-sided) silica-metal nanoparticles and the underlying principles.

About the speaker: Dr. Hongyu Chen obtained his B. Sc. from University of Science and Technology of China (USTC) in 1998. He then moved to Yale University and studied Mn and water oxidation chemistry. After obtaining his Ph.D. degree in 2004, he worked as a post-doctoral fellow in Cornell University on the topic of protein-nanoparticle hybrids. In 2006, he joined the Division of Chemistry and Biological Chemistry in Nanyang Technological University in Singapore, where he is currently an Associate Professor. His main research interest is in the development of new synthetic methodologies for nanostructures.