报告题目：Soft Materials and Soft Machines: from Tunable Surfaces to Emerging Electronics and Medical Devices
报 告 人:Changyong Cao (Duke University)
Soft materials, such as polymers, foams and hydrogels, are defined as those that can deform easily and to very large strains. Their shapes and sizes can vary greatly even if the applied forces are small. Soft materials, different from the “hard materials” like steel and concrete, have very different properties and applications, but have been much less explored. This offers us a great opportunity for breakthrough discoveries and inventions in engineering and medicine. In this talk, I will focus on the mechanics and applications of the soft materials, in particular the instabilities of film-substrate system. The mechanical instabilities of hybrid materials result in self-organized patterns and drastic changes in morphology, which can lead to unprecedented functions of materials and structures. I will first describe how to use numerical and experimental methods to identify the instability modes and the scaling laws for generating desired tunable surface patterns. Then I will demonstrate you how to harness mechanical instabilities and large deformations in soft materials to develop stretchable supercapacitors and novel medical devices. I will also show you some interesting projects on tunable composites, tough hydrogels and printed electronic systems.
Dr. Changyong Cao is now a Postdoctoral Research Associate in Electrical Engineering and Mechanical Engineering at Duke University, USA. He obtained his Ph.D. in Mechanical Engineering & Materials Science from the Australian National University (ANU) in 2013 with an emphasis in computational mechanics and solid mechanics. His research interests are primarily in the area of soft materials, nanomaterials and emerging electronics, including the mechanics of soft materials, nanomaterials and biological materials, the design and fabrication of flexible/stretchable/printable electronics and medical devices, as well as the multiscale and multifield analysis of advanced materials. Dr. Cao has coauthored over 30 peer-reviewed publications and his work has received widespread media attention and reorganization. He has also been awarded many awards and scholarships, including the prestigious ANU Vice Chancellor’s and Dean’s Fellowships, Chinese Government Award for Outstanding Self-financed Students Abroad, MRS Best Poster Award, and many others.