Seminar - Multifunctional composites containing ferromagnetic microwires by Professor Hua-Xin Peng
Date: 07 April 2014 (Monday)
Time: 4:00 pm – 5:00 pm
Venue: EF305, The Hong Kong Polytechnic University
Multi-functional composite essentially refers to a composite material that, beyond its primary structural function, possesses additional functionalities attained by constituent materials. Such a concept has led us to devote efforts in exploring ideal functional fillers that could meet the criteria: (i) a likely omnipotent functional filler that will ensure the realization of multi-functionalities and a relatively simple composite architecture, and (ii) a fine geometry and large susceptibility to external fields that will warrant a low and effective loading of fillers. In this context, soft ferromagnetic amorphous glass-coated microwires (AGCMs) with singular giant magneto-impedance (GMI) and/or giant stress-impedance (GSI) effect are promising candidates and led to the advent of ferromagnetic wire composites. In the present talk, the latest progress in microwave tunable properties and associated peculiarities of electromagnetic spectra are analysed in the presence of stress field and magnetic field. The developed microwire composites have demonstrated stress sensing, microwave absorption capability as well as emerging metamaterial characteristics. The understanding of the influence of composite architecture such as material parameters of microwires and microwire periodicity, offers useful insights in developing multifunctional microwire composites for specific engineering applications such as stress sensing, structural health monitoring, microwave absorption and invisible cloaking (stealth).
Dr. Peng is a full Professor of Aerospace Materials in ACCIS and the Deputy Director of NSQI at the University of Bristol. He gained his PhD (1996) and MSc (1993) in composite materials in Harbin Institute of Technology and BEng (1990) in Zhejiang University. Before joining Bristol University in 2002, he was a Research Fellow in the Materials Department at Oxford University and Brunel University. His research activities follow two main streams: (1): Nanomaterial through Engineering to Applications; and (2) Novel Composites and Microstructures. He has published over 90 peer reviewed Journal articles including two authoritative monographs in Progress in Materials Science. He has been invited to give Plenary/Keynote/Invited talks at over 15 international conferences/workshops and involved in organizing major international conferences including ICCM.