Effects of Surface Modification of Carbon Nanotube on the Mechanical Properties of Multi-Walled Carbon Nanotube/Alumina Composites
Effects of Surface Modification of Carbon Nanotube on the Mechanical Properties of Multi-Walled Carbon Nanotube/Alumina Composites
复制标题
碳纳米管表面改性对多壁碳纳米管/氧化铝复合材料力学性能的影响
DOI：
10.1299/kikaia.78.843
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Hashida
中科院分区：
文献类型：
--
作者：
G. Yamamoto;K. Shirasu;Y. Nozaka;M. Omori;T. Takagi;T. Hashida
用含量高达3.7体积%的多壁碳纳米管（MWCNT）增强的氧化铝复合材料通过前驱体法制备。本研究中使用的多壁碳纳米管通过酸处理0 ~ 4 h进行改性。酸处理背后的基本原理是引入纳米级缺陷并在MWCNT表面上吸附带负电荷的官能团。为了评估多壁碳纳米管的酸处理对复合材料的力学性能和纳米/微观结构的影响，我们研究了多壁碳纳米管的结晶和断口形貌。我们发现，对于提高复合材料的力学性能，存在一个最佳酸处理时间，即，复合材料的弯曲强度和断裂韧性与MWCNT在基体中的分散度密切相关。在酸处理2 h后，MWCNT的伸长率和复合材料的力学性能同时增加，然后随着酸处理时间的增加而逐渐降低。TEM观察显示，对于酸处理3和4小时的MWCNT粉末，观察到MWCNT结构中的几层剥离。这些结果表明，过多的酸处理的多壁碳纳米管导致降解的多壁碳纳米管和复合材料的力学性能。这可能是由于MWCNT结构中几层剥离导致带负电荷的官能团数量减少。
Alumina composites reinforced with multi-walled carbon nanotube (MWCNT) content up to 3.7 vol.% were prepared by precursor method. The MWCNT used in this study were modified with the acid treatment for 0 ~ 4 hours. The rationale behind the acid treatment was to introduce nanoscale defects and adsorb negatively charged functional groups on the surface of the MWCNT. In order to evaluate the effects of the acid treatment of the MWCNT on the mechanical properties and nano/microstructures of the composites, we investigated the dispersibility of MWCNT and morphology of the fracture surface. We found that there was an optimal acid treatment time for improving the mechanical properties of the composites, i.e., the bending strength and fracture toughness of the composites were correlated highly with the dispersibility of the MWCNT in the matrix. The dispersibility of MWCNT and mechanical properties of the composites were simultaneously increased up to 2 hours, and then they were decreased gradually with increasing acid treatment time. TEM observations revealed that peel-off of a few layers in the MWCNT structure was observed for the MWCNT powders acid-treated for 3 and 4 hours. These results implied that the excessive acid treatment of the MWCNT resulted in degradation of the dispersibility of MWCNT and mechanical properties of the composites. This may be due to the decrease in the number of the negatively charged functional groups by the peel-off of a few layers in the MWCNT structure.
DOI：
10.1016/j.mseb.2007.09.013
发表时间：
2008-02
影响因子：
3.6
作者：
G. Yamamoto;M. Omori;K. Yokomizo;T. Hashida;K. Adachi
通讯作者：
G. Yamamoto;M. Omori;K. Yokomizo;T. Hashida;K. Adachi
影响因子：
4.1
作者：
Yamamoto, Go;Suk, Ji Won;Ruoff, Rodney S.
通讯作者：
Ruoff, Rodney S.
影响因子：
2.8
作者：
Mielke, SL;Troya, D;Belytschko, T
通讯作者：
Belytschko, T