Prof. Junhui Hu
Prof. Junhui Hu
Nanjing University of Aeronautics and Astronautics, China
Title: Nano cutting and pressing based on ultrasonic vibration
Cutting and pressing of a nanoscale workpiece is useful in nano testing and fabrication, and novel cutting and pressing methods with simple device structures and easy operation are needed for practical applications in nano engineering. In this speech, ultrasonic cutting and pressing strategies for nano samples, which were proposed and developed by our group recently, are presented. With the strategies, cutting and pressing of individual silver nanowires with a diameter from 50 nm to 400 nm have been implemented. In the tooling, vibration velocity amplitude of the micro ultrasonic tool’s root was from 18 to 220 mm/s, and the working frequency was about 96.9 kHz and 45.2 kHz, respectively. The measured dependency of the vibration velocity and AgNW diameter on the cutting and pressing quality is also given and discussed.
Junhui Hu is a Chang-Jiang Distinguished Professor, and the deputy director of Interdisciplinary Research Institute of Aeronautics and Astronautics at Nanjing University of Aeronautics and Astronautics, China. He received his Ph.D. Degree from Tokyo Institute of Technology, Tokyo, Japan, in 1997, and B. E. and M. E. degrees in electrical engineering from Zhejiang University, Hangzhou, China, in 1986 and 1989, respectively. He is also a Shuang-Chuang expert of Jiangshu Province. He was an assistant and associate professor at Nanyang Technological University, Singapore, from 2001 to 2010. His research interest is in piezoelectric/ultrasonic actuating technology. He is the author and co-author of about 250 papers and disclosed patents, including more than 80 full SCI journal papers and one editorial review for an international journal, and the sole author of monograph book “Ultrasonic Micro/Nano Manipulations” (2014, World Scientific, Singapore). He is the editorial board member of three international journals. Dr. Hu won the Paper Prize from the Institute of Electronics, Information and Communication Engineers (Japan) as the first author in 1998, and was once awarded the title of valued reviewer by Sensors and Actuators A: Physical and Ultrasonics. His research work has been highlighted by 7 international scientific media. He has given more than ten keynote speeches/ invited talks at international conferences, and served as the honorary chairman of 2011 International Workshop on Piezoelectric Materials and Applications in Actuators, and general chairman of 2016 International Conference on Mechanical Control and Automation (ICMCA2016) and 2017 International Conference on Electric Engineering and Automation Control.