期刊论文

Research of fracture mechanism and defects of MWCNTs by wet ball milling

Cai, X.

中文

功能材料

Journal of Functional Materials

1001-9731

2016

47

1

1163-1168

10.3969/j.issn.1001-9731.2016.01.033

云南省重大资助项目(2014FC001)；

本校为其他机构

搅拌桨转速在800/1 000 r/min下,对多壁碳纳米管(MWCNTs)进行湿式球磨0.5和1.0 h。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1 h,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 0.5 and 1.0 h at a rotational speed 800/1 000 r/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 0.5 and 1.0 h. 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% respecti...