(Lecture, May 17) Bio-inspired Design of Stimuli Responsive Materials Based on a Bilayer Structure
time: 2017-05-15


(Lecture, May 17) Bio-inspired Design of Stimuli Responsive Materials Based on a Bilayer Structure
Title: Bio-inspired Design of Stimuli Responsive Materials Based on a Bilayer Structure
Speaker: Prof. Luyi Sun (University of Connecticut)
Time: 15:00p.m., May 17th, 2017
Venue: Room 405, Shaw Engineering Building, Wushan Campus

Abstract:

A bilayer structure composed of polyvinyl alcohol (PVA) or PVA composite thin film atop thick polydimethylsiloxane (PDMS) substrate was prepared. The bilayer structure shows 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 switching “on/off” fluorescence, changing fluorescent color, revealing/hiding information upon mechanical stimuli were prepared. Mechanical and/or moisture responsive wrinkling surface can also be achieved in a similar manner. By altering the chemical structure of the PVA top layer, three different moisture responsive dynamic wrinkling surfaces can be prepared. Selectively inducing chemical modification on the PVA surface can create moisture responsive patterned wrinkles, which can lead to applications in encryption, anti-counterfeit tab, and water indicator for circuits.


Brief introduction to Prof. Luyi Sun:
Luyi Sun, Ph.D
Department of Chemical & Biomolecular Engineering
Polymer Program, Institute of Materials Science
University of Connecticut
Storrs, CT 06269
Tel:(860)486-6895
Email: luyi.sun@uconn.edu
Web: http://wp.luyi-sun.uconn.edu/

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 (100) peer-reviewed journal articles and is the inventor/co-inventor of thirty nine (39) International and US patents/patent applications. The scientific results by Dr. Sun 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), Materials360 Online of the Materials Research Society (MRS), Yahoo, MSN, etc. Dr. Sun was selected to be a Fellow of the Society of Plastics Engineers (SPE) in 2016.