Li Dong, Xin Liantao, Yang Bocheng, Chen Zizheng, Wu Qianru, Han Fangqian, Hao Shulan, Feng Lihu, Wang Xiaoyu, Wang Shiying, Wang Lei, He Maoshuai
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Molecules. 2022 Nov 7;27(21):7657. doi: 10.3390/molecules27217657.
Homogenously dispersing single-walled carbon nanotubes (SWNTs) in solvents has been one critical step towards exploiting their exceptional properties in high-performance components. However, the solubility of SWNTs is severely limited by the inert tube surfaces and strong tube-tube van der Waals attractions. Starting with carbon nanotubides, i.e., negatively charged SWNTs reduced by alkali metals, we herein propose a sonication-free approach to prepare an aqueous dispersion of SWNTs. The approach combines the spontaneous dissolution of nanotubides in polar aprotic solvents with polyvinylpyrrolidone wrapping and dialysis in deionized HO, which results in well-dispersed, neutralized SWNTs. The gelation of concentrated SWNT dispersion leads to the formation of hydrogels, which is subsequently transformed into SWNT aerogels through lyophilization. The prepared SWNT aerogels exhibit high-mass-sorption capacities for organic solvent absorption, paving the way towards harvesting the extraordinary properties of SWNTs.
将单壁碳纳米管（SWNTs）均匀分散在溶剂中一直是在高性能组件中利用其优异性能的关键一步。然而，SWNTs的溶解度受到惰性管表面和强烈的管间范德华引力的严重限制。从碳纳米管盐（即通过碱金属还原得到的带负电荷的SWNTs）开始，我们在此提出一种无需超声处理的方法来制备SWNTs的水分散体。该方法将纳米管盐在极性非质子溶剂中的自发溶解与聚乙烯吡咯烷酮包裹以及在去离子水中的透析相结合，从而得到分散良好、已中和的SWNTs。浓缩的SWNT分散体的凝胶化导致水凝胶的形成，随后通过冻干将其转化为SWNT气凝胶。所制备的SWNT气凝胶在有机溶剂吸收方面表现出高质量吸附能力，为利用SWNTs的非凡性能铺平了道路。
