以十六烷基三甲基溴化铵(CTAB)为分散剂, 制备了分散性能良好的碳纳米管悬浮液. 通过测定等温吸附曲线和悬浮液的Zeta电位, 研究了CTAB对碳纳米管表面性质的影响. 结果表明, CTAB的加入使Zeta电位由-29mV变为65mV左右; 等温吸附曲线表明,CTAB在碳纳米管表面为“两阶段吸附”, CTAB浓度为9×10-4 mol·L-1时, 在碳纳米管表面达到饱和吸附. 通过悬浮碳纳米管浓度测定确定了所需最佳CTAB的用量为9×10-4 mol·L-1左右, 同时对CTAB的吸附分散机理进行了分析和讨论.
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.
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