美國加州大學陳大勇教授學術報告

報告題目：Modulating Surface Energy to Promote Superior Wettability and Mechanical Instability

報告人：陳大勇 教授

University of California, Los Angeles

主持人：陳永明  教授

時間：2017年8月23日（星期三）上午10：30

地點：豐盛堂A402

歡迎廣大師生參加！

摘要：

Functional surfaces play important roles in many technical applications including drag reduction, anti-icing, water harvesting and heat transfer. Modulating surface energy and interfacial interactions can lead to desirable surface and interfacial properties, which will cast tremendous beneficial impact on the aforementioned applications. In this talk, I will first show that a low surface energy amplified by surface roughness gives rise to a superhydrophobic surface. Trapping air between water and a superhydrophobic surface can induce significant drag reduction for flow past the surface. Second, I will describe a new antiicing strategy by modulating interfacial interactions between water molecules and solid surfaces, yielding surfaces with remarkably low ice adhesion strength. In addition, patterning a surface with high and low surface energy contrast can enhance the efficiency of water harvesting and heat transfer. In the third example, I will show that surface energy or “wettability” can be patterned spontaneously on both flat and curved surfaces in a single step process, by taking advantage of a reversible creasing instability on a polyurethane elastomer film. Such patterned surfaces show potential in enhancing water collection efficiency. Surface energy can significantly influence the deformation of soft materials. Finally, I will focus on how surface energy retards creasing instability observed on elastomers under large compression.

個人簡介：

陳大勇，本科和碩士畢業于天津大學。博士畢業于美國University of Massachusetts Amherst大學高分子專業。在Massachusetts Institute of Technology 兩年博士後研究之後，現在在University of California, Los Angeles工作。主要研究方向包括高分子材料的彈性力學，彈性失穩，以及利用這些現象構建新型功能材料；表界面物理化學，潤濕現象，和表界面粘附，摩擦控制；新型合成生物醫學材料等。先後在 Proceedings Of The National Academy Of Sciences,Physical Review Letters, Science Advances, Advanced Materials, Materials Horizons, 等期刊發表20餘篇論文。目前申請三項美國專利，其中一項現已授權于一個位于Boston, Massachusetts的公司進行商業化開發。2015年獲得Exxon Mobil-MIT Energy Fellow 獎勵資助。