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Mechanics of Nanostructured Networks: Microstructural Evolution and Dynamic Properties

( 2017-06-19 )

  【报  告  人】 徐志平 教授,清华大学工程力学系

  【时     间】 2017年6月19日(星期一)上午10:00

  【地     点】 力一楼227会议室

  Abstract: Concepts such as entanglement and multimodality have been widely explored in polymer physics to understand the structures and mechanics of flexible molecular chain networks. Phenomena such as the glass transition and viscoelastic responses to external cues can be well explained with developed models in this field, allowing rational design of polymeric materials with high performance and multifunctions. In this talk, I will discuss how these ideas could be implanted into the network of semiflexible nanostructures, such as carbon nanotubes and graphene. We will demonstrate microstructural evolution of networks under mechanical loading, strengthening and toughening mechanisms of nanostructure assemblies by introducing bimodal crosslinks, and the dynamic properties of networks with responsive crosslinks. With the significance of enthalpic elasticity in these networks of low-dimensional nanostructures, their performance could be elevated compared to the polymer networks with an entropic nature, holding promises in relevant structural and functional applications.

  Biography: Dr. Zhiping Xu received his B.S. (2002) and Ph.D (2007) from Tsinghua University. After working at Rice University (2007-2008) and MIT (2008-2010), he returned to Tsinghua and now is a professor of engineering mechanics. His recent research interests include physics of networked materials, and microscale fluid-structure interaction.

  


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