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会议通知->张奇博士学术报告会
   首页 -> 会议通知 -> 张奇博士学术报告会
张奇博士学术报告会
所属类型:会议通知   |   阅读次数:1998  
 

张奇博士学术报告会

 

 

报告题目:Materials for electrocaloric cooling and nanostructured materials for various applications

报告人:Dr Qi Zhang

邀请人:上官文峰袁坚

报告会时间:20111031(周一)上午1030-1130

报告会地点:机动学院大楼A501会议室

 

报告内容摘要:

An applied electric field can reversibly change the temperature of an electrocaloric material under adiabatic conditions, and the effect is strongest near phase transitions. This phenomenon has been largely ignored because only small effects (0.003 K V-1) have been seen in bulk samples such as Pb0.99Nb0.02(Zr0.75Sn0.20Ti0.05)0.98O3 and there is no consensus on macroscopic models. Here we demonstrate a giant electrocaloric effect (0.48 K V-1) in 300 nm sol-gel PbZr0.95Ti0.05O3 films near the ferroelectric Curie temperature of 220oC. We also demonstrate the electrocaloric effects on other ferroelectric materials that have phase transition temperature around room temperature. A solid state device concept for electrical refrigeration that has the capacity to outperform Peltier or magnetocaloric coolers will be suggested.

Nanostructured materials lie at the heart of fundamental advances in efficient energy storage and/or conversion, in which surface processes and transport kinetics play determining roles. We demonstrate a simple method to form a core-shell structure of two materials. An example of such core-shell structured material, fluorinated graphite (CFx) coated with carbon, has demonstrated that the electrochemical performance can be greatly improved by coating a uniform carbon layer on commercial CFx (x = 1) powder used as cathode material in lithium battery.

 

报告人简介:

Dr. Q Zhang is currently a senior lecturer in functional materials in Microsystems and Nanotechnology Centre at Cranfield University. His main areas of research are within synthesis of nanomaterials for various applications, fabrication of transparent conducting thin films and sol-gel synthesis and structural characterization of ferroelectric thin films for electrocaloric cooling. He is a fellow and charted scientist in the institute of Materials, Minerals and Mining. He authored and co-authored about 150 peer reviewed papers and book chapters including high-profile journals like Science and Nano letters, etc. He achieved Brian Mercer Feasibility Award of The Royal Society, UK for his outstanding work on nanomaterials in 2009.

 



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