讲座题目：Multifunctional Biomimetic Nanocoatings: from an Intact Thin Film to Microcracks to Wrinkles and the Corresponding Property Tuning
主讲人：SUN LUYI – 美国康涅狄格大学教授
In this presentation, nanocoatings with three distinct microstructures inspired by nature will be discussed. In the first part, organic/inorganic hybrid nanocoatings with a nacre-like microstructure generated via a facile co-assembly process will be presented. Thanks to the high concentration (up to 70 wt%) of well-aligned inorganic nanosheets and a well-integrated structure after crosslinking, such thin coatings exhibit exceptional mechanical, barrier, and flame retardant properties, while maintaining a high transparency. In the second part, inspired by marine organisms that can use muscle-controlled surface structures to achieve rapid and reversible changes in transparency, color, and patterns, a series of strain dependent mechanochromic devices will be presented. Utilizing microcracks generated via deformation-controlled surface-engineering, rigid nanocoatings affixed atop a soft substrate exhibit abroad range of mechanochromic behaviors with high sensitivity and reversibility. In the third part, a series of moisture responsive wrinkle dynamics inspired by human skin on a similar bilayer structure featuring different reversibility and stability will be discussed. 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. The above three biomimetic nanocoatings are promising for widespread applications.
Dr. Luyi Sun is a Castleman Professor in Engineering Innovation in the Department of Chemical and Biomolecular Engineering, and the director of the Polymer Program at the University of Connecticut. His current research focuses on the design and synthesis of nano-structured multifunctional hybrids for various applications. Dr. Sun has published more than one hundred fifty (150) peer-reviewed journal articles. He is the inventor/co-inventor of forty (40) international and US patents/patent applications. Many of his patents have been licensed or commercialized. The scientific results by Dr. Sun’s group have been reported by major media including Chemical & Engineering News of the American Chemical Society, Plastics Engineering magazine of the Society of Plastics Engineers (SPE), New Scientist, Smithsonian Magazine, Yahoo, MSN, etc. Dr. Sun is a Fellow of the Society of Plastics Engineers (SPE) and a Fellow of the Royal Society of Chemistry (RSC).