题目一：High Power Density Dual Phase Energy Harvesting

报告人  Prof.  Shashank Priya

Mechanical Engineering, Virginia Tech, Blacksburg, USA

题目二：Novel Thick Film Deposition Process: Aerosol-Deposition for Functional Materials at Room Temperature

报告人  Prof.  Jungho Ryu

Functional Ceramics Group, Korea Institute of Materials Science

Dept. of Materials Science and Engineering, Korea University of Science and Technology

 

 

报告内容摘要：

报告一：

Novel material properties open the possibility of developing new components and systems. These new components and systems require sustainable power to operate. This synergy between the materials – energy – smart systems has provided the new paradigm for innovation driving the emergence of efficient and high performance architectures. Some examples illustrating these platforms will be provided in this presentation. One such platform being the self-powered structural health monitoring and control nodes. The vast reduction in the size and power consumption of sensors and CMOS circuitry has opened the opportunity to develop on-board power sources that can replace or extend the life of the batteries. In some applications such as sensors for structural health monitoring in remote locations, geographically inaccessible temperature or humidity sensors, the battery charging or replacement operations can be tedious and expensive. Logically, the emphasis in such cases has been on developing the on-site generators that can transform any available form of energy at the location into electrical energy. Piezoelectric energy harvesting has emerged as one of the prime methods for transforming mechanical energy into electric energy. Various forms of piezoelectric transducer structures have been fabricated to capture the mechanical energy with high efficiency. At micro-to-nanoscale, the design of transducer becomes challenging as the size reduction is accompanied by enhancement in the resonance frequency. We will review the solution to the problem of low frequency resonant transducer structures. Next, we will utilize these novel transducers to develop dual phase harvesters, one that can capture mechanical energy and magnetic energy at the same time. Ferromagnetic – ferroelectric composite resonant transducers with giant magnetoelectric coefficient at ZERO bias were fabricated and utilized for the low frequency energy harvesting system. Transition of these structures on the micro/nano scale will be discussed and experimental results in this direction will be provided. Implementation of these structures on the practical platforms will be demonstrated.

 

报告二：

Room Temperature Powder Spray in Vacuum (RTPSV) process, known as Aerosol deposition (AD) is the process to fabricate thick and dense ceramic film at RT, based on impact collision of solid ceramic particles. This technique can provide crack-free dense thin and thick films with thicknesses ranging from sub micrometer to several hundred micrometers with very fast deposition rates. In addition, this technique is using pure solid particles (without any liquid phase) to form the ceramic films at RT, there is few limitation of the substrate and easy to control the compositions of the ceramic films. Functional ceramics group in KIMS is working on this process for various kinds of functional ceramic thick films for electronic, mechanical, environmental, energy, and biomedical applications since 2005. In this seminar, I review the progress made in synthesis of ceramic thick films based various ceramics such as piezoelectrics, dielectrics, solid electrolytes, thermoelectrics, biomaterials, photocatalyst, and etc by RTPSV. Especially, the noticeable experimental results, for examples, thickness controllability, residual stress control, large area ceramics films, patterning technique, multilayer deposition, and potential applications of ceramic thick film by RTPSV will be addressed.

 

 

报告人简介：

Shashank Priya (Virginia Tech, USA) is currently Professor in department of mechanical engineering. His research is focused in the areas related to multifunctional materials, energy and bio-inspired systems. He has published over 250 peer-reviewed journal papers and more than 50 conference proceedings covering these topics. Additionally, he has published more than four book chapters, five US patents, and five edited books. He is the founder and chair of the Annual Energy Harvesting Workshop series and Energy Summit. He is currently serving as the chief editor of journal “Energy Harvesting and Systems”, editorial board member of journal integrated ferroelectrics and advisory board member of journal of dielectrics. He is also serving as the member of the Honorary Chair Committee for the International Workshop on Piezoelectric Materials and Applications (IWPMA). Shashank has received several awards including: Alumni award for excellence in Research 2014, Fellow American Ceramic Society 2013, Turner Fellowship 2012, Dean’s Research Excellence Award 2011, and AFOSR Young Investigator Award.

 

Jungho Ryu: One of the pioneers in magnetoelectric laminate composites is the principal researcher of Korea Institute of Materials Science (KIMS), Korea. He received the B.S. and M.S. degrees in materials science and engineering from Yeungnam University, Korea in 1996 and 1998, respectively. He awarded his Ph.D degree from school of materials science and engineering at Seoul National University, Korea in 2001 on Magnetoelectric composite materials. During his Ph.D work, he had been working at the International Center for Actuators and Transducers (ICAT) of the Pennsylvania State University on magnetoelectric composites and piezoelectric materials. After being awarded his Ph.D degree, Dr. Ryu became a post doctoral researcher at this center continuing his work on high power piezoelectric materials. Prior to joining KIMS in 2006, he was a senior engineer and project leader at the Samsung Electro-Mechanics Co. Ltd, Korea. His current research interests include the development and processing of the piezoelectric and ferroelectric devices, energy harvesting, ceramic processing, smart actuators, and functional thin/thick ceramics film fabrication through aerosol deposition method. He has authored over 150 publications in peer-reviewed international journals and 80 patents in the magnetoelectric, piezoelectric materials and devices, and functional ceramic films. Total number of citation on his research articles are over 2500 times and h index is over 24

 

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