LDRD Seminar Series: ‘Wearable Electronics and Sensors: Self-Assembly of Block Copolymers in Ionic Liquid’
Postdoctoral Appointee Yunsong Xie (ES), will discuss his Laboratory-Directed Research and Development (LDRD) sponsored work at the LDRD Seminar Series presentation Tuesday, March 6, 2018. “Wearable Electronics and Sensors: Self-Assembly of Block Copolymers in Ionic Liquid” begins at 12:30 p.m. in the Building 203 Auditorium. All are welcome to attend.
This LDRD Seed project has led to a highly active university/government/industry collaboration. This collaboration covers the entire chain of how a material was developed in fundamental research, used in a device in a product development and eventually found to meet the needs of a particular group of customers.
An ultra-stretchable and highly conductive iono-elastomer was developed by self-assembly of block copolymers in ionic liquid. SAXS data reveals that this iono-elastomer has a FCC-to-HCP microstructure transition during elongation. The iono-elastomer further shows an interesting electrical behavior: the conductance decreases while being elongated and increases while being heated. We discovered the conductance change could be increased over 10 times by tuning the water content in the iono-elastomer.
By capitalizing on the improved electrical response, a wireless wearable thermo-mechano sensor has been designed, fabricated and characterized. This wearable sensor not only measures the motion of the human body in real time, but also provides local body surface temperature information in real time. Combining printing circuit board, 3-D printing and Bluetooth technologies, this device is not only functional as a stand-alone product, but also has a miniaturized size and customer-friendly appearance.
Customer interviews have been carried out to evaluate this wearable thermo-mechano sensor. It was found that sports athletes and heat rehab patients are particularly interested in this product.
Yunsong Xie joined the Energy Systems Division as a postdoctoral researcher in 2016. He has a Ph. D. in physics from the University of Delaware and has published more than 30 journal and conference papers. Throughout his career, he has contributed to various projects funded by the National Science Foundation, the National Aeronautics and Space Administration, the U.S. Army, the Defense Advanced Research Projects Agency, LDRD and industrial companies. His material research areas include development of devices and advanced materials. The device research includes analog (signal processing and sensing applications), RF and terahertz circuit/device/system design, fabrication and characterization.
The advanced material research includes nanomagnetic materials, supercapacitors electrode materials, stretchable conductive materials and solar steam materials. Xie currently works on stretchable electronics, RF energy harvesting and additive manufacturing. He was recently selected as a Chain Reaction Innovation competition semifinalist for the progress of RF energy harvesting research.