Dispersing Single-Walled Carbon Nanotubes with Surfactants: A Small Angle Neutron Scattering Study
Dispersing Single-Walled Carbon Nanotubes with Surfactants: A Small Angle Neutron Scattering Study
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DOI：
10.1021/nl048969z
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发表时间：
2004-08
期刊：
影响因子：
10.8
通讯作者：
Howard Wang;Wei Zhou;D. Ho;K. Winey;J. Fischer;C. Glinka;E. Hobbie
中科院分区：
文献类型：
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作者：
Howard Wang;Wei Zhou;D. Ho;K. Winey;J. Fischer;C. Glinka;E. Hobbie
用小角中子散射法研究了单壁碳纳米管在表面活性剂辛基酚聚氧乙烯醚(Triton X-100)存在下在重水中的分散行为。结果表明，分散的最佳表面活性剂浓度是表面活性剂在单壁碳纳米管表面吸附最大化和表面活性剂胶束介导的单壁碳纳米管束之间的耗尽相互作用竞争的结果。后一种效应促使单壁碳纳米管在临界胶束体积分数以上重新聚集。这些行为可普遍应用于两亲性表面活性剂分散单壁碳纳米管。数据还显示，单壁碳纳米管中氢的显著非相干散射，很可能是由于净化过程中的酸和水残留物造成的。
We have investigated the dispersion of single-walled carbon nanotubes (SWNTs) in heavy water with the surfactant octyl-phenol-ethoxylate (Triton X-100) using small angle neutron scattering. The results indicate an optimal surfactant concentration for dispersion, which we suggest results from competition between maximization of surfactant adsorption onto SWNT surfaces and a depletion interaction between SWNT bundles mediated by surfactant micelles. The latter effect drives SWNT reaggregation above a critical volume fraction of micelles. These behaviors could be general in dispersing SWNTs using amphiphilic surfactant. The data also reveal significant incoherent scattering from hydrogen in SWNTs, most likely due to acid and water residues from the purification process.