摘要 : We investigated the multiwalled carbon nanotubes (MWCNTs) stability (ability to stay in the water column) in aqueous solutions meant to emulate the ionic nature of the major types of natural waters with the idea of simulating thei... 展开 We investigated the multiwalled carbon nanotubes (MWCNTs) stability (ability to stay in the water column) in aqueous solutions meant to emulate the ionic nature of the major types of natural waters with the idea of simulating their behavior and possible interactions in natural aqueous systems. Synthesized MWCNTs were suspended in anionic, non-ionic, and cationic surfactants. Subsequently, the MWCNTs were added to: a) solutions containing Ca2+, Mg2+, or Na+, and b) four types of artificial waters (sodium carbonate, calcium carbonate, sodium chloride, and magnesium sulfate). Its stability was determined using UV-Vis spectroscopy and transmission electron microscopy. The MWCNTs stability was found to be a function of the concentration and valence of the major water cations and was higher when suspended in anionic and non-ionic surfactants as compared to a cationic surfactant. The results of this study suggest that MWCNTs suspended in cationic surfactants might sediment independently of the type of water, while MWCNTs suspended in anionic and non-ionic surfactants may remain in the column of a sodium chloride type water. This study helps to better understand the behavior and likely fate of MWCNTs in natural aqueous systems, a topic that gains growing importance as the production and application of these types of nanomaterials are increasing. 收起