Effects of oxidative conditions on properties of multi-walled carbon nanotubes in polymer nanocomposites
Effects of oxidative conditions on properties of multi-walled carbon nanotubes in polymer nanocomposites
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DOI：
10.1016/j.compscitech.2006.06.003
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发表时间：
2007-05-01
影响因子：
9.1
通讯作者：
Advani, Suresh G.
中科院分区：
文献类型：
--
作者：
Hong, Chang-Eui;Lee, Joong-Hee;Advani, Suresh G.
研究了氧化条件对多壁碳纳米管(MWNTs)性能的影响。多壁碳纳米管已经用硫酸和硝酸的混合物进行了氧化。改变MWNTs氧化过程的时间和温度，以了解MWNTs氧化的临界过程和性质的变化。用扫描电子显微镜和透射电子显微镜观察了不同氧化条件下碳纳米管的形貌。随着回流时间和回流温度的增加，多壁碳纳米管的长度急剧减少。基于实验结果，提出了一个唯象模型，该模型预测了多壁碳纳米管的平均长度随氧化时间和温度的变化。结果表明，通过控制氧化过程的有效参数可以获得理想的多壁碳纳米管的平均长度。通过透射电子显微镜观察多壁碳纳米管壁面的损伤情况，了解多壁碳纳米管的长度磨损情况。此外，MWNTs长度越短，MWNTs/PP纳米复合材料的分散性越好。(C)2006爱思唯尔有限公司。保留所有权利。
This study investigates the effects of the oxidizing conditions on the properties of the multi-walled carbon nanotubes (MWNTs). MWNTs have been oxidized using a mixture of sulfuric and nitric acids. The time and temperature of the oxidation process of MWNTs were varied to understand the critical process and the changes in properties of the MWNTs. The morphologies of MWNTs oxidized under various conditions were observed with a scanning electron microscopy (SEM) and a transmission electron microscope (TEM). The length of MWNTs decreased dramatically when the refluxing time and temperature were increased. Based on the experimental results a phenomenological model is suggested that predicts the average length of MWNTs as a function of oxidation time and temperature. The results suggest that it is possible to obtain the desired average length of MWNTs by controlling the effective parameters of the oxidation process. The damages in the wall of the MWNTs were monitored through TEM to understand the attrition in length of the MWNT. Further, better dispersion was observed in the MWNTs/PP nanocomposites with the shorter length of MWNTs. (c) 2006 Elsevier Ltd. All rights reserved.