Department of Chemistry, Silesian University of Technology, B. Krzywoustego 4, 44-100 Gliwice, Poland.
Nanotechnology. 2018 Oct 5;29(40):405704. doi: 10.1088/1361-6528/aad359. Epub 2018 Jul 13.
We have demonstrated that large diameter (1.8 ± 0.4 nm) carbon nanotubes (CNTs) can be separated by means of the aqueous two-phase extraction (ATPE). This rapid and convenient tool has enabled us to isolate fractions of particular CNT diameter distribution. We have shown how a range of parameters can be used to fine tune the characteristics of the isolated material. Interestingly, by varying the pH of the medium, we have suppressed the extraction of low diameter CNTs and only large diameter CNTs were obtained. A number of other factors such as selected surfactant concentration steps, temperature or amount of starting CNT material have been found to have a significant effect on the end result of the CNT differentiation. The findings have provided us with more insight regarding the underlying mechanics of ATPE for processing polydisperse CNT mixtures.
我们已经证明，大直径（1.8±0.4nm）碳纳米管（CNTs）可以通过双水相萃取（ATPE）分离。这种快速便捷的工具使我们能够分离出具有特定 CNT 直径分布的馏分。我们已经展示了如何使用一系列参数来微调分离材料的特性。有趣的是，通过改变介质的 pH 值，我们抑制了低直径 CNT 的萃取，只得到了大直径 CNT。已经发现，许多其他因素，如选择的表面活性剂浓度步骤、温度或起始 CNT 材料的量，对 CNT 分化的最终结果有显著影响。这些发现为我们深入了解 ATPE 处理多分散 CNT 混合物的基本机制提供了更多的认识。
