時 間：2019年5月9日(星期四) 9:00-10:30
地 點：航空樓A706
報 告 人：西安交通大學陳小明教授
邀 請 人：張超教授
報 告 題目：Nanomechanical characterization of the mechanical strength of carbon nanotube - polymer interfaces
個人簡介：
陳小明博士現任西安交通大學機械工程學院教授。陳小明博士于2014年獲得美國紐約州立大學賓漢姆頓分校機械工程專業(yè)博士學位。并分別于2016和2017年入選西安交通大學“青年拔尖人才”支持計劃和國家級青年人才培養(yǎng)計劃。他主要從事微納制造技術及微納尺度界面效應等方面研究，主持或參加國家自然科學基金和國家重點研發(fā)計劃等國家級項目4項；并參與美國美國空軍科學研究項目，美國國家自然科學基金項目等國家級項目4項。在國際重要刊物上發(fā)表論文二十余篇，并參與撰寫學術書籍2部，擔任十余個國際高水平期刊評審專家。研究成果被包括Nature, Physical Review Letters等高水平期刊引用及被國際ScienceDaily, Phys.org等十多個知名科學信息平臺報導。
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.
