Professor Ryan Hayward
University of Massachusetts-Amherst
Hosted by Professor Jason Zhang
Tuesday January 29, 2019
11:00AM, CCB Auditorium
“Fabrication and Assembly of Shape-programmed Polymer Sheets”
Spatially non-uniform stresses within thin elastic structures can be used to define a wide variety of buckling modes that provide control over the three-dimensional shapes of materials. By incorporating stimuli-responsive polymer networks within such constructs, it is possible to prepare materials with dynamically reconfigurable shapes and properties. As one example, our group has prepared single- and multi-layer films of polymer gels that undergo swelling-induced buckling into well-defined 3D forms. Such control of shape also allows for the precise definition of the interactions between particles, for example due to capillary forces between patterned sheets adsorbed at fluid interfaces. Moving beyond materials with a single pre-defined shape transition, we seek to develop materials with shapes that can be continuously reprogrammed. In particular, we focus on photothermal actuation of nanocomposite gels, which allows for rapid and highly reversible shape changes and directed motion of gel sheets.
~Coffee/tea will b served prior to lecture.~