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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 6: 1122 - 1126

DOI: https://doi.org/10.3724/SP.J.1077.2007.01122

Research Paper

Dispersion of Carbon Nanotubes in Aqueous Solution with Cationic Surfactant CTAB

  • XIAO Qi ,
  • WANG Ping-Hua ,
  • JI Ling-Ling ,
  • TAN Xiao-Ke ,
  • OUYANG Lin-Li
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  • (Department of Inorganical Materials, School of Mineral processing and Bioengineering, Central South University, Changsha 410083, China)

Received date: 2006-10-21

  Revised date: 2006-11-24

  Online published: 2007-11-20

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Abstract

Stable homogeneous dispersions of carbon nanotubes were prepared by using cetyl trimethyl ammonium bromide (CTAB) as dispersant. Surface chemistry of the carbon nanotube was investigated by measuring isotherm adsorption and Zeta potential. The stabilization mechanism of the carbon nanotubes in aqueous solution of surfactant CTAB was discussed. In the CTAB solutions, the Zeta-potential of carbon nanotube surface progressively increases with increasing the CTAB concentration, in which the Zeta potential of carbon nanotube changes from -29mV to 65mV. The isotherms of CTAB adsorption on carbon nanotubes indicate a two-step mechanism of adsorption, and the isotherms reach the saturation plateau at CTAB concentration of about 9×10-4 mol·L-1. The optimum concentration of CTAB to obtain a stable homogeneous dispersions of carbon nanotubes is about 9×10-4 mol·tL-1.

Key words： carbon nanotubes; cetyl trimethyl ammonium bromide (CTAB); dispersion

Cite this article

XIAO Qi , WANG Ping-Hua , JI Ling-Ling , TAN Xiao-Ke , OUYANG Lin-Li . Dispersion of Carbon Nanotubes in Aqueous Solution with Cationic Surfactant CTAB[J]. Journal of Inorganic Materials, 2007 , 22(6) : 1122 -1126 . DOI: 10.3724/SP.J.1077.2007.01122

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