時(shí) 間：2019年5月9日(星期四) 9:00-10:30
地 點(diǎn)：航空樓A706
報(bào) 告 人：西安交通大學(xué)陳小明教授
邀 請(qǐng) 人：張超教授
報(bào) 告 題目：Nanomechanical characterization of the mechanical strength of carbon nanotube - polymer interfaces
個(gè)人簡(jiǎn)介：
陳小明博士現(xiàn)任西安交通大學(xué)機(jī)械工程學(xué)院教授。陳小明博士于2014年獲得美國(guó)紐約州立大學(xué)賓漢姆頓分校機(jī)械工程專(zhuān)業(yè)博士學(xué)位。并分別于2016和2017年入選西安交通大學(xué)“青年拔尖人才”支持計(jì)劃和國(guó)家級(jí)青年人才培養(yǎng)計(jì)劃。他主要從事微納制造技術(shù)及微納尺度界面效應(yīng)等方面研究，主持或參加國(guó)家自然科學(xué)基金和國(guó)家重點(diǎn)研發(fā)計(jì)劃等國(guó)家級(jí)項(xiàng)目4項(xiàng)；并參與美國(guó)美國(guó)空軍科學(xué)研究項(xiàng)目，美國(guó)國(guó)家自然科學(xué)基金項(xiàng)目等國(guó)家級(jí)項(xiàng)目4項(xiàng)。在國(guó)際重要刊物上發(fā)表論文二十余篇，并參與撰寫(xiě)學(xué)術(shù)書(shū)籍2部，擔(dān)任十余個(gè)國(guó)際高水平期刊評(píng)審專(zhuān)家。研究成果被包括Nature, Physical Review Letters等高水平期刊引用及被國(guó)際ScienceDaily, Phys.org等十多個(gè)知名科學(xué)信息平臺(tái)報(bào)導(dǎo)。
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.
