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学术报告-Novel Development of Directionally Porous Ceramics for Lightweight Materials Design

作者:  2019-06-28

 

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类别     学术报告 发布单位     信息科学与技术学院
报告(活动)名称     Novel Development of Directionally Porous Ceramics for Lightweight Materials Design    
报告(活动)时间     2019/7/3 15:00:00 至2019/7/3 17:00:00    
报告(活动)地点     中心会议室(图书馆一层) 报告(活动)人数     80
报告(活动)内容     Ice-templated directionally porous, hierarchical ceramics are a new class of materials and can potentially impact a wide range of industries. However, processing innovations in templating are in urgent need for improved process control and enhancement of mechanical properties and functionalities, to accelerate the deployment of this technology for practical implementation. This talk will present an innovative methodology by incorporating dielectrophoresis (DEP) into the existing ice-templating process for the synthesis of ice-templated ceramics. When an AC field is applied to a suspension during the traditional ice-templating process, the field will result in a concentration gradient along the direction of applied field. This is attributed to the formation of chains of particles due to the assembly of the colloidal particles from the resulting DEP forces. Due to the DEP forces, a thick layer forms at the bottom of the suspension in which concentration of particles is relatively higher compared to the rest of suspension above it. Increase in concentration of particles at the bottom of a suspension will increase the number of sites for heterogeneous nucleation of ice crystals and thus the number of ice crystals, which thereby provides a novel approach to increase lamellar bridge density in ice-templated structure and enhance mechanical properties without the need of changing composition and freezing front velocity. 报告人简介 Shizhi Qian received his Ph.D. from Mechanical Engineering and Applied Mechanics at the University of Pennsylvania in December 2004. He was a World Class University Fellow in Korea during the period from 2009 to 2014. He is Associate Professor at the Department of Mechanical and Aerospace Engineering in Old Dominion University. His research focuses on microfluidics and nanofluidics, electrokinetic transport, and single micron/submicron (bio)particle manipulation and characterization. Since 2002, he has published 170+ peer-reviewed journal articles, 1 book, 5 book chapters, and ?100 works in conference proceedings.
类别     自然科学类    
主办单位     信息科学与技术学院研总支学生会    
报名方式     网上报名    
报名时间     2019/6/26 11:30:00 至2019/7/3 14:00:00