碳纳米管
化学工程
十二烷基硫酸钠
肺表面活性物质
材料科学
胶体
Zeta电位
水溶液
吸附
悬挂(拓扑)
分散剂
傅里叶变换红外光谱
扫描电子显微镜
降水
纳米颗粒
纳米技术
色散(光学)
化学
色谱法
有机化学
复合材料
工程类
同伦
气象学
物理
光学
纯数学
数学
作者
Linqin Jiang,Lian Gao,Jing Sun
标识
DOI:10.1016/s0021-9797(02)00176-5
摘要
Stable homogeneous dispersions of carbon nanotubes (CNTs) have been prepared by using sodium dodecyl sulfate (SDS) as dispersing agent. To our knowledge, it is the first report to quantitatively characterize colloidal stability of the dispersions by UV-vis spectrophometric measurements. When the sediment time reaches 500 h, the supernatant CNT concentration drops as much as 50% for the bare CNT suspension, compared to 15% with the addition of SDS. Furthermore, after 150 h, no precipitation is found for CNT/SDS dispersions, exhibiting an extreme stability. Zeta potential, auger electron microscopy, and FTIR analysis are employed to investigate the adsorption mechanism in detail. It has been concluded that the surfactant containing a single straight-chain hydrophobic segment and a terminal hydrophilic segment can modify the CNTs-suspending medium interface and prevent aggregation over long periods. The morphology of the CNT dispersions is observed with optical microscopy. An intermediate domain of homogeneously dispersed nanotubes exhibits an optimum at 0.5 wt% CNTs and 2.0 wt% SDS.
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