报告题目：Graphene Oxide Aerogel Metamaterials for Ultra-robust Directional Sensing at Human-machine Interfaces
时间：2025年1月16日（星期四）09:00-11:30
地点：南岭校区机械材料馆529室
报告人：Prof Ben Bin Xu
主持人：吴文征教授
举办单位：机械与航空航天工程学院 数控装备可靠性教育部重点实验室
报告人简介：
Ben Bin Xu (FRSC, FIMMM, FRSA, FSCI) is a Professor (Chair) of Materials and Energy in the Department of Mechanical and Construction Engineering at Northumbria University, UK. Ben’s research interests cover Materials, Surface/interface, Sustainability, Energy, Biomedical engineering and micro-engineering. He has published 270+ peer reviewed journal articles (40+ ESI highly cited paper in the WoS by Nov 2024), 10 books/chapters, 7 patents, given 100+ invited talks and won multiple awards (Stanford/Elsevier World Top 2% Scientist (2024), AIChE Excellence in Research - Mid-Career Investigator Award in the ‘composites’ area (2023), Technology for Social Impact Award in The IET Excellence and Innovation Award Event (2023), 2016 Young investigator award from the International Polymer Networks Group, etc.). Ben chairs the Materials Characterization & Properties Group in the Institute of Materials, Mining and Minerals (IoM3) and the Composites Division in the American Institute of Chemical Engineers (AICHE, US). He holds the title of visiting professorship in 10+ universities globally. Ben is an advisory council member for IoM3, panel member for UKRI and RSC grant committee, etc.
报告摘要：
Graphene aerogels hold huge promises in developing high performance pressure sensors for future human machine interface, due to their highly ordered microstructure and conductive network. However, the bottleneck to their application is the limited strain sensing range caused by intrinsic stiff honeycomb-like structure. Herein, an anisotropic crosslinked chitosan and reduced graphene oxide (CCS-rGO) aerogel metamaterial with a buckling network is realized for the first time, by reconfiguring the microstructure from honeycomb to buckling structure on the cross-section plane, via simple freeze-casting and heating/post-crosslinking strategies. The reconfigured CCS-rGO aerogel shows hyperelasticity with extraordinary durability - no obvious structural damage after 20,000 load-unload cycles under a directional compressive strain up to 0.7. The novel CCS-rGO aerogels based conceptual pressure sensors exhibit an ultrahigh sensitivity of 121.45 kPa-1, an unprecedent sensing range (maximum compressive stress of 146.7 kPa, peak directional compressive strain of 0.95), and robust mechanical and electrical performances. The aerogel metamaterials sensors are assembled and demonstrated to monitor human motions, control robotic hand and even integrated in a flexible electrical keyboard to play music. The functionalities enabled by CCS-rGO may open a wide application potential in future human machine interface.
