CEE Infrastructure Seminar Series (Presented by EERI Student Group): “Multifunctional Materials for Autonomous Infrastructures”
Friday, January 11, 2019 - 1:00pm

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In this seminar, the speaker will present his research effort to realize autonomous infrastructures with intelligent, self-sustainable, and resilient features using multifunctional materials. The autonomous infrastructures are envisioned to sense external stimuli to autonomously detect damage and self-heal the damage without human intervention. In addition, energy being dissipated in infrastructures will be harvested as a supplemental energy source for sustaining the sensor network as well as whole infrastructure systems. To encode the sensing, self-healing, and energy harvesting capabilities into the infrastructures, the speaker has employed multifunctional materials to design mechano-luminescence-optoelectronic (MLO) composites. The MLO composites are composed of two functional building blocks: 1) mechano-optoelectronic (MO) conjugated polymer and 2) mechano-luminescent (ML) crystals. The functional building blocks are designed to attain target functionalities for scaling up from molecular to device scale. The MLO composites generate direct current (DC) through two-step mechanical-radiant-electrical energy conversion. It was shown that the DC varied its magnitude with tensile strain level and loading frequency. The generated DC can be used as a supplemental energy source. In addition, selfhealing capability will be encoded into the MLO composites using light-sensitive polymer along with the ML crystals. The MLO composites will be applicable for devising self-powered internet-of-things (IoT) sensors for autonomous structural health monitoring (SHM) systems, self-powered sensing skin, autonomous composites (AutoCom) for self-sustainable infrastructures, and wearable devices for monitoring human motions.


Donghyeon Ryu, Ph.D., P.E., is an assistant professor in the Department of Mechanical Engineering at New Mexico Tech (August 2014 – present). He obtained a Ph.D. in the Department of Civil and Environmental Engineering in September 2014 and M.S. in the Department of Mechanical and Aerospace Engineering in March 2014 from the University of California, Davis. Before then, he obtained M.S. (2008) and B.S. (2004) in the Department of Civil and Environmental Engineering at Yonsei University in Seoul, South Korea. Dr. Ryu is active in research on multifunctional materials and nanocomposites for autonomous infrastructures, structural health monitoring, multi-modal sensors, and energy harvesting. His research has been funded by NASA, Office of Naval Research, Federal Aviation Administration, Los Alamos National Lab, among some others. He won three best paper awards from America Society of Mechanical Engineers, 9th International Workshop on Structural Health Monitoring, and 10th International Conference on Damage Assessment of Structures. He was an ASCE ExCEEd Teaching Workshop Fellow in 2018. He has edited 1 book series, authored 2 book chapters, 11 journal papers, and 24 conference papers.