专题：Superfluid Helium: a New Frontier in Nanoscience
主讲人：Shengfu Yang (Department of Chemistry, University of Leicester)
Helium droplets are clusters of helium whose size can vary over a huge range, spanning a few dozen to in excess of 1011 helium atoms. They possess some unique properties that are important for fabrication of nanomaterials, such as 1) a very low temperature (0.37 K), 2) superfluidity, 3) the ability to add materials sequentially, 4) the chemical inertness of helium.
Here we present the recent progress in the fabrication of novel nanoparticles and nanowires using superfluid helium droplets. A series of exploratory experiments will be reported, including the fabrication of single crystalline nanoparticles, core-shell nanoparticles and nanowires. A major breakthrough in nanomagnetics, namely, ferromagnetism in antiferromagnetic chromium, and ferromagnetic nanoparticles with the atomic magnetic moments, will also be highlighted.
Prof. Shengfu Yang obtained a BSc degree in Tsinghua University, a MSc degree in Dalian Institute of Chemical Physics and a PhD degree at University of Science and Technology of China. He has worked in several world-class laboratories in China (USTC), France (Université Joseph Fourier), United States (Massachusetts Institute of Technology) and Finland (University of Helsinki), where he led a number of research programmes and acquired a wide range of experience in physical chemistry. He joined the University of Leicester in 2003 and was awarded a prestigious EPSRC Advanced Research Fellowship in 2006, before being appointed to an associate professorship in 2011. At Leicester, his research focuses on superfluid helium droplets, covering both Physical Chemistry and NanoChemistry. He is currently an international leader in novel nanoscience based on superfluid helium.