摘要
搅拌桨转速在800/1 000r/min下,对多壁碳纳米管(MWCNTs)进行湿式球磨0.5和1.0h。通过激光粒度仪、XRD、TEM、Raman光谱和TG-DTA,分别对球磨后MWCNTs的结构形貌、断裂机理和缺陷进行分析。结果表明,湿式球磨0.5和1h,可以快速切断MWCNTs得到U字形端口的MWCNTs,并且其主体结构没有被破坏;相比原始MWCNTs的无定形碳含量分别增加了2.2%和1.8%。MWCNTs湿式球磨断裂机理为高速碰撞的磨球产生巨大的压强作用在MWCNTs表面使其发生轴压屈曲形变,表现为凹陷、弯曲、扭结和断裂等。微观解释为,MWCNTs受到外加压强超过极限压强时,通过改变C—C键夹角释放部分能量来保持整个体系能量的平衡。
The multi-walled carbon nanotubes(MWCNTs)were processed by wet ball milling for 0.5and 1.0h at a rotational speed 800/1 000r/min.The structural morphology,fracture mechanism and defects of MWCNTs were analyzed by laser particle analyzer,XRD,TEM,TG-DTA and Raman spectrum.The results showed that,after wet ball milled for 0.5and 1.0h.The MWCNTs are quickly cut off,and the fracture of MWCNTs shape like a U letter,and that main structure were not damaged.At the same time,amorphous carbon content increased by 2.2%and 1.8%respectively.Fracture mechanism of wet ball milling of MWCNTs:MWCNTs obtained axial compression buckling deformation due to grinding balls of high-speed collision produced huge pressure on the surface,performance to the forced area of MWCNTs appeared as sunken,bend,kink and breaking.The root reason in microstructure is that when the additional pressure on carbon nanotubes exceeds the limit point,the bond angle of C—C reduced to release energy and keep the balance of the whole system.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2016年第1期1163-1168,共6页
Journal of Functional Materials
基金
云南省重大资助项目(2014FC001)
