The study is aimed at investigating the diffusion of single-walled nanotubes in liquids with the weight concentration of nanotubes varied from 0.00001 to 0.01%. Water solutions of sodium dodecylbenzene sulfate and polyvinylpyrrolidone, which are usually used as surfactants, are applied here as a carrier liquid. Their concentration is either equal to the concentration of nanotubes or twice greater. Depending on the concentration, the diffusion coefficient of nanotubes is found to change from 1.02·10⁻¹¹ to 0.7·10⁻¹² m²/s. Based on the data on the diffusion coefficient, the effective hydrodynamic size of nanotubes and their length are retrieved. The efficiency of nanotube separation by means of centrifugation and the changes in their characteristics during long-term storage are discussed.

该研究旨在研究单壁纳米管在液体中的扩散，纳米管的重量浓度范围为0.00001至0.01％。通常用作表面活性剂的十二烷基苯硫酸钠和聚乙烯吡咯烷酮的水溶液在此用作载液。它们的浓度等于纳米管的浓度或两倍以上。根据浓度，发现纳米管的扩散系数从1.02·10 ^-11变为0.7·10 ^-12 m ²/ s。根据有关扩散系数的数据，检索纳米管的有效流体动力学尺寸及其长度。讨论了通过离心分离纳米管的效率及其在长期保存过程中特性的变化。