Transition and Stability of Copolymer Adsorption Morphologies on the Surface of Carbon Nanotubes and Implications on Their Dispersion

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• 作者：Asghar Habibnejad Korayem ; Mohammad Reza Barati ; George P. Simon ; Tim Williams ; Xiao Ling Zhao ; Pieter Stroeve ; Wen Hui Duan
• 刊名：Langmuir
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：30
• 期：33
• 页码：10035-10042
• 全文大小：396K
• ISSN：1520-5827

文摘

In this study, the adsorption morphologies as well as stability and transitions of a commercial dispersant copolymer (BYK 9076) on the surface of multiwalled carbon nanotubes (MWCNTs) were studied using Fourier transform infrared and UV鈥搗is spectroscopy, dynamic light scattering, and electron microscopy techniques. The results show that the dispersion of carbon nanotubes in ethanol does not increase continuously with increasing copolymer/CNT ratio, which is correlated with the adsorption morphologies of the copolymer on the CNT surface. At a ratio of copolymer/CNT below 0.5, the morphology is random, shifting to a hemimicelle structure at a ratio from 0.5 to 1.0 while at ratios above 1.0, a cylindrical pattern is seen. The hemimicelle morphology is able to prevent the agglomeration of CNTs when the CNT concentration increases to 8.7 mg/mL, while cylindrical morphology is more efficient and stable to provide dispersion of CNTs at higher concentrations of CNTs.