时 间：2019年5月9日(星期四) 9:00-10:30
地 点：航空楼A706
报 告 人：西安交通大学陈小明教授
邀 请 人：张超教授
报 告 题目：Nanomechanical characterization of the mechanical strength of carbon nanotube - polymer interfaces
个人简介：
陈小明博士现任西安交通大学机械工程学院教授。陈小明博士于2014年获得美国纽约州立大学宾汉姆顿分校机械工程专业博士学位。并分别于2016和2017年入选西安交通大学“青年拔尖人才”支持计划和国家级青年人才培养计划。他主要从事微纳制造技术及微纳尺度界面效应等方面研究，主持或参加国家自然科学基金和国家重点研发计划等国家级项目4项；并参与美国美国空军科学研究项目，美国国家自然科学基金项目等国家级项目4项。在国际重要刊物上发表论文二十余篇，并参与撰写学术书籍2部，担任十余个国际高水平期刊评审专家。研究成果被包括Nature, Physical Review Letters等高水平期刊引用及被国际ScienceDaily, Phys.org等十多个知名科学信息平台报导。
摘要：
The light, strong and durable characteristics of nanofiber-reinforced polymer-matrix nanocomposites are attractive to a number of industries such as the aerospace and automotive industries. Carbon nanotubes (CNTs) are one of the most promising reinforcing fibers for nanocomposite due to their ultra-strong, resilient and low-density properties. However, the understanding of the interfacial load transfer on CNT-polymer interfaces remains elusive. In this talk, we present experimental studies of the mechanical strength of the interfaces formed by individual CNTs with PMMA/Epoxy matrices. The nanotube-polymer interfacial strength was characterized by using in situ electron microscopy nanomechanical single-tube pull-out techniques. By pulling out individual double-walled nanotubes from polymer matrices using atomic force microscopic force sensors inside a high-resolution scanning electron microscope, both the pull-out force and the embedded tube length were measured with resolutions of a few nano-newtons and nanometers, respectively. The interfacial shear strength (IFSS) of the CNT-polymer interface was quantified through interpreting the nanomechanical single-tube pull-out measurements using a continuum mechanics model. The nanomechanical measurements reveal the shear-lag effect in the load transfer on the CNT-polymer interface. The research findings help to better understand the load transfer on the tube-polymer interface and the reinforcing mechanism of the nanotubes, and ultimately contribute to the optimal design and performance of nanotube-reinforced polymer nanocomposites.
