报告人： Hong Yang 教授 School of Mechanical and Chemical Engineering，University of Western Australia
Over the last two decades, extensive research and development have paved the way to the establishment of exciting fields of nanomaterials and nanotechnology. Many novel and exceptional properties of nanomaterials (compared to their bulk counterparts) stem from the unique shapes and architectures of nano-scaled crystals. Naturally, one would question the underlying reasons dictating the nanocrystal morphology.
This lecture explains the underlying mechanisms of crystal growth under thermodynamic and kinetic controlled conditions in two typical nanomaterials processing conditions: (i) 2D Cu dendritic single crystals formed in hydrothermal environment and (ii) 1D Co nanowires produced by electrochemical deposition using nano-channeled templates. These examples highlight different crystal growth controlling criterions at work during crystal growth. The hydrothermal environment is characteristic of high chemical reaction rates, quasi-weightless environment and confinement-free crystal growth conditions. The electrochemical deposition in nano-channeled template is characteristic of controlled atomic attachment and confined crystal growth. The final morphology of nanocrystals are dictated by the sequential operative mechanisms influenced by the specific chemical environments and kinetic conditions for the synthesis.
Prof. Hong Yang obtained her PhD from the University of Pennsylvania in 1991 and commenced her academic career in 1995 at the University of Western Australia (UWA). She is now a Professor of Materials Engineering in the School of Mechanical and Chemical Engineering at UWA. She has a broad research interest in the area of functional and engineering materials, including materials thermodynamics, materials chemistry, materials synthesis, nano-functional and microporous materials for catalysis and energy conversion, nano-engineered bulk metallic materials and martensitic transformations in metals. Professor Yang also actively engages in industrial research and her most recent industrial research includes corrosion control of subsea pipelines, waste to energy from biomass, and value-added products from spent types. Professor Yang serves as a member of international advisory committee of several international conference series and is a member of editorial board of Materials Technology: Advanced Performance Materials.