第45讲

讲座题目：Novel functional materials based on metal nanostructures
演讲嘉宾：邵丽华 博士
时间：2015年12月4日上午10：00-11:30
地点：交通学院会议室501室
摘要：Nanomaterials with tunable electronic structure exploit the large specific surface area of metal nanostructures along with the strategy of tuning the surface properties through the controlled introduction of space-charge regions. In this way, materials with tunable macroscopic properties can be created. Based on this idea, electrochemically tunable functional nanomaterials for actuation and photonics have recently been demonstrated. The talk will present an overview over the recent achievements and the ensuing opportunities for future research.
Using nanoporous metals, one can achieve large strain amplitude and mechanical energy density in a stiff actuator material. The underlying mechanism is the changes in the surface stress of the metal when in contact with an electrolyte and subject to potential variation. A similar concept may be applied to carbon aerogel, which is a light-weight, low cost porous material with extremely large surface area that can be loaded in compression. Recent work demonstrates the potential of this material for actuation application with large reversible strain amplitude. This material also exhibits large mass-specific strain energy density, which even exceeds that of piezoceramics and of nanoporous metal actuators.

Another instance for the concept of tunable nanomaterials is electrically tunable photonic metamaterials. Metamaterials use arrays of lithographically structured resonators to achieve an unconventional optical response. Here, the space-charge at the surface of each resonator is controlled via an applied potential. This leads to a reversibly tunable optical resonance. Recent research exemplifies the new opportunities for designing functional nanomaterials which exploit nanoscale structure along with interfacial processes at electrode surfaces.

简介： 2008年在德国卡尔斯鲁厄理工学院（KIT）攻读博士学位，其后跟随导师Joerg Weissmueller教授在汉堡工业大学完成博士论文及答辩并在2012年初以最优成绩（top 3%）取得博士学位，之后在汉堡工业大学材料物理与技术系做博士后。2015年4月作为“卓越百人计划”副教授加入北航航空科学与工程学院。主要从事对新型纳米功能材料及其在力、电、化学等多场耦合下的性能的研究。在毛细力驱动下的纳米多孔材料的变形机理分析、开发碳气凝胶轻质驱动器、电信号可控光子超材料以及碳纳米管增强复合材料宏观力学性能等研究领域取得了极具价值的成果。相关工作得到国际领域广大专家的认可，并已在各材料类顶级期刊、物理及力学类等优秀期刊上发表。