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Title:
Novel Nanoscience in Superfluid Helium |
Abstract:
Helium droplet have now emerged as a powerful tool for the synthesis of novel nanomaterials.They possess unique properties such as 1) a very low temperature (0.37 K); 2) superfluidity; and 3) ultrahigh thermal conductivity. Additionally, they allow sequential addition of materials, facilitating the formation of core-shell structures, and can form 1-D nanostructures by utilizing quantum vortices as the intrinsic one-dimensional templates. These properties make helium droplet technology uniquely powerful for the fabrication of novel nanomaterials, offering unusual degree of control.
This lecture will provide a comprehensive coverage on helium droplet technology, including the fundamentals, apparatus, recent progress and their perspective as nano-reactors for the growth of novel nanostructures. Recent discoveries including the first observation of ferromagnetism in antiferromagnetic chromium nanoparticles, the direct growth of nanoparticle assemblies using weak van der Waals templates, and the manipulation of quantized vortices in superfluid helium will be highlighted.
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Biography:
Dr Shengfu Yang FRSC is a Professor in Physical Chemistry and Nanochemistry at the School of Chemistry, University of Leicester, UK. He has worked in several world-class laboratories in China (University of Science and Technology of China), France (Université Joseph Fourier, Grenoble), United States (Massachusetts Institute of Technology) and Finland (University of Helsinki). His current research focuses on superfluid helium droplets, covering both physical chemistry and nanoscience. He is internationally leading in the fabrication of novel nanomaterials using superfluid helium droplets as the growth medium.
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