AMA 2019 Speakers
Prof. Stephen M. Hsu (Plenary Speaker)
The George Washington University, USA
Biography: Hsu studied boundary lubrication under Prof. Elma Klaus at Pa State University. After graduation, he joined Amoco Chemicals to develop lubricant additives. After 4 years, he joined National Institute of Standards and Technology, a US National Lab. to lead the effort of Tribochemistry, Nanotechnology, and materials science. In 2009, he joined George Washington University to lead the Energy Initiative.
宾夕法尼亚州立大学博士，香港大学城市制造工程与工程管理系主任讲座教授，马里兰大学物理科学与技术学院兼任教授，马里兰大学材料科学系兼任教授，宾夕法尼亚州立大学化学工程客座教授兼客座教授，美国西北大学材料科学客座教授。Prof. Stephen M. Hsu的能源效率实验室和纳米材料实验室在建筑、交通和机械方面进行可再生能源和能源效率技术的研究，目前的项目包括摩擦控制表面纹理，多尺度多功能曲面设计包括疏水、疏冰，风能，自修复齿轮技术和纳米复合材料。Prof. Stephen M. Hsu的大多数项目是由工业伙伴和政府机构共同合作的。
Ttitle of Speech 1 : Multiscale, multifunctional surface: an engineering path towards applications
Abstract: Multiscale multifunctional surface, to some extent, is a natural outgrowth of extending smart surface to multifaceted active surfaces, which, in the age of autonomous systems, inevitably leads to self-healing and self-repairing. In self-healing and self-repairing systems, healing agents and catalysts have to be available in the system when healing is required. For polymer systems, the storage of healing agents can be embedded into the polymers, but the intimate contact with the catalysts necessary to initiate the repairing process is a challenge. For metal systems, the storage of healing agents is difficult especially for sliding interfaces, not to mention the lack of repairing mechanism for restoring processes of metal systems.
Ttitle of Speech 2 : Icephobic surface design and measurement technique
Abstract: The recent opening of the Northern Sea Route during the summer months, connecting Pacific Ocean and Atlantic Ocean through the Arctic Sea, has created a trillion dollar potential for development and world commerce. At the same time, this also has prompted the search for ice accretion control on ships under severe atmospheric conditions. Ice could severely hinder communication and radar functions, and make life boat launch difficult. During snow and ice storms, cumulative ice buildup could jeopardize ship stability.
Many papers report research on icephobic surfaces, and many papers are based on wetting theory and biomimetic surfaces. Yet under certain conditions, water moisture in air can sublime directly forming ice crystals and stick to the surface. Once a monolayer of ice crystals is connected on the surface, ice accretion will start regardless of the surface design. Our approach is to reduce the residence time of ice crystals/supercooled droplets to a minimum to prevent ice crystallization from propagation. Results are promising.
There is no standard icephobicity test method or widely accepted standards. We have developed several cryogenic thermal analysis instruments capable of measuring icing delay and accretion under seafaring conditions. This allows comparison of various icephobic coatings for potential application to shipping industry.