Mechanism of carbon nanotube dispersion and precipitation during treatment with poly(acrylic acid)

被引：11
|
作者：
Tran, N. H. [1 ,2 ]
Milev, A. S. [1 ]
Wilson, M. A. [1 ,2 ,3 ]
Bartlett, J. R. [1 ]
Kannangara, G. S. K. [1 ,2 ]
机构：
[1] Univ Western Sydney, Sch Nat Sci, Penrith, NSW 1797, Australia
[2] Univ Queensland, ARC Ctr Excellence Funct Nanomat, Brisbane, Qld 4072, Australia
[3] CSIRO, Div Petr Resources, N Ryde, NSW 1670, Australia
来源：
SURFACE AND INTERFACE ANALYSIS | 2008年 / 40卷 / 09期
基金：
澳大利亚研究理事会;
关键词：
poly(acrylic acid); carbon nanotube; dispersion;
D O I：
10.1002/sia.2889
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Carbon nanotubes have been shown to be easily dispersed within an acidic aqueous solution of poly(acrylic acid) but precipitate when the pH is increased. Transmission electron microscopy showed that the nanotubes were more exfoliated under the acidic condition but highly aggregated under the basic condition. Carbon K-edge NEXAFS spectroscopy showed that the carbon nanotubes did not chemically react with poly(acrylic acid) during the dispersion or precipitation and that the dispersion mainly involved physical adsorption of poly(acrylic acid) onto the nanotubes. Together with the carbon K-edge NEXAFS spectra, the cobalt L-3,L-2-edge NEXAFS spectra suggested that under the basic condition, the cobalt impurity within the nanotubes strongly reacted with poly(acrylic acid) resulting in complex formation. Cobalt reduces the adsorption of poly(acrylic acid) onto the nanotubes, which then reduced the nanotube dispersion and resulted in the precipitation. Copyright (C) 2008 John Wiley & Sons, Ltd.
引用
收藏
页码：1294 / 1298
页数：5
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