报告人：闫澄教授 澳大利亚昆士兰科技大学

题目：Fabrication and mechanical characterization of advanced carbon and energy materials

时间：2015年12月4日10:00

地点：综合1号实验楼602

Carbon nanotube (CNT) and graphenehave attracted major interest due to their exceptional electrical, mechanical, and thermal properties. The potential applications include structural and functional composites, energy harvesting and storage systems, bio devices and filtration membranes.CNT/graphene based nanocomposites can be applied to flexible displays, photovoltaic cells, and electromagnetic-wave interference materials. Based on the relationship between conductivity and mechanical strain, resistance-type strain sensors can be also built. In spite of these promising results, fundamental understanding of mechanical and electrical properties of CNT, graphene and their polymer nanocomposite is still lacking. In this presentation, our recent work on modeling and characterization of CNT/graphene polymer interfaces will be briefly introduced.  

On the other hand, advanced energy systems with enhanced conversion efficiencies, improved storage capacities and better reliabilities are being developed to meet the global energy needs.Lithium ion battery technology is increasingly used in portable electronic devices and electric vehicles owing to its high energy density and long lifespan. Silicon, with its highest theoretical specific capacityhas emerged as a promising candidate as anode material. However, maintaining structural integrity of silicon remains as a challenge due to its huge volume expansion and possible mechanical failure during lithiation/delithiation process. In this presentation, our recent work on the stress profiles and atomic structure evolutions under electrochemical process will be introduced. 

Cheng Yan got his PhD from the University of Sydney in 1998. He is a professor in the School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Australia. His main research interests include composites, nanomaterials and nanomechanics, energy materials, biomaterials and biomechanics. He has generated more than 140 journal publications and received more than A$5 million research fund. Many publications appear in top international journal such as Nano Letters, Scientific Report, Carbon, ActaMaterialia, etc. He was awarded several competitive fellowships from the Australian Research Council (ARC APD and ARC ARF) and has been committee member of Australia Fracture Group and Australian ATN Nanotechnology Network. He is the editorial member of Composite Communications, Materials Technology, Graphene, etc.