美国加州大学陈大勇教授学术报告

报告题目：Modulating Surface Energy to Promote Superior Wettability and Mechanical Instability

报告人：陈大勇 教授

University of California, Los Angeles

主持人：陈永明  教授

时间：2017年8月23日（星期三）上午10：30

地点：丰盛堂A402

欢迎广大师生参加！

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.

个人简介：

陈大勇，本科和硕士毕业于天津大学。博士毕业于美国University of Massachusetts Amherst大学高分子专业。在Massachusetts Institute of Technology 两年博士后研究之后，现在在University of California, Los Angeles工作。主要研究方向包括高分子材料的弹性力学，弹性失稳，以及利用这些现象构建新型功能材料；表界面物理化学，润湿现象，和表界面粘附，摩擦控制；新型合成生物医学材料等。先后在 Proceedings Of The National Academy Of Sciences,Physical Review Letters, Science Advances, Advanced Materials, Materials Horizons, 等期刊发表20余篇论文。目前申请三项美国专利，其中一项现已授权于一个位于Boston, Massachusetts的公司进行商业化开发。2015年获得Exxon Mobil-MIT Energy Fellow 奖励资助。