Stability of the aqueous suspensions of nanotubes in the presence of nonionic surfactant

被引:105
作者
Lisunova, Milana O.
Lebovka, Nikolai I. [1 ]
Melezhyk, Exander V.
Boiko, Yurie P.
机构
[1] Natl Aviat Univ, Fac Appl Phys, Kiev, Ukraine
[2] Natl Acad Sci Ukraine, Inst Biocolloid Chem, Kiev, Ukraine
[3] TM Spetsmash Ltd, Kiev, Ukraine
关键词
nanotubes; aqueous suspensions; electrical conductivity; percolation; fractal dimension;
D O I
10.1016/j.jcis.2006.03.012
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
Stability of aqueous suspensions of multiwalled carbon nanotubes (MWNTs) and their percolation behavior are investigated. Nanotubes of aqueous suspensions show a strong tendency to aggregation and networking into electroconductive clusters. The percolation threshold of the electrical conductivity is rather low and of order phi approximate to 0.01 (where phi is the volume fraction), which can be explained by the high aspect ratio of MWNTs. Strong influence of the nonionic surfactant Triton X-305 on the colloidal stability of aqueous suspensions of MWNTs is observed. Addition of surfactant exerts a stabilizing effect at surfactant concentration C-s proportional to the weight concentration C of MWNTs, C-s approximate to C mol/dm(3). The transient behavior of electrical conductivity in the aqueous suspensions is explained by fractal aggregation processes. The fractal dimension is shown to be sensitive to the surfactant concentration C-s. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:740 / 746
页数:7
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