2018年3月24日上午美国康州大学Luyi SUN教授学术报告

“化时代，聚前沿”化工学科系列讲座第34讲

报告题目： Bio-inspired Multifunctional Stimuli-Responsive Materials

报告人：  Prof. Dr. Luyi Sun

主持人：  李伟华 院长

报告地点： 珠海校区海滨红楼5号104室

报告时间： 2018年3月24日（星期六）9:00AM

报告人简介：

Dr. Luyi Sun is a Castleman Professor in Engineering Innovation in the Department of Chemical & Biomolecular Engineering and Polymer Program, Institute of Materials Science at the University of Connecticut. His current research focuses on the design and synthesis of nano-structured multifunctional materials for various applications. Dr. Sun has published more than one hundred forty (140) peer-reviewed journal articles and is the inventor/co-inventor of forty three (43) patents/patent applications. The scientific results by Dr. Sun’s group have been reported by major media including Chemical & Engineering News, Smithsonian Magazine, New Scientist, Yahoo, MSN, etc.

报告内容：

A number of marine organisms use muscle-controlled surface structures to achieve rapid changes in color and transparency with outstanding reversibility. Inspired by these display tactics, we develop analogous deformation-controlled surface-engineering approaches via strain-dependent cracks and folds. A bilayer structure composed of polyvinyl alcohol composite thin film atop elastomer substrate was designed and prepared to achieve dynamic strain-responsive optical properties. The transition between a transparent state to an opaque state can be easily achieved by uni-axially stretching and releasing the device. Also, a series of derivative mechanochromisms with capabilities of switch “on/off” fluorescence, change fluorescent color, reveal/hide information upon mechanical stimuli are prepared. These devices feature virtually no changes in optical/mechanical properties after being repeatedly stretched and released thousands of times, promising for widespread applications. Corresponding mechanics simulation was also explored, which helped to guide a more precise design of the bilayer structure. In addition to the above mechanochromisms, a series of moisture responsive wrinkle dynamics inspired by human skin were achieved on a similar bilayer structure featuring different reversibility and stability. These unique responsive dynamics result in the invention of a series of optical devices triggered by moisture, including anti-counterfeit tabs, encryption devices, water indicators, light diffusors, and anti-glare films.