title: Aqueous stability of oxidized carbon nanotubes and the precipitation by salts.
abstract: The stability of nitric acid oxidized carbon nanotubes (CNTs) and the precipitation of oxidized CNTs in water by salts were investigated. Stability investigation shows that during an aging time of 30 days, oxidized CNTs dispersion shows characteristic UV-vis absorbance peak of individual CNTs at 252 nm and CNTs concentration in the dispersion after 30d aging is 85% of the initial concentration. The precipitation value of salts were measured and the precipitation value follows the order of NaCl>KCl>1/2(MgCl(2))>1/2(CaCl(2))>1/3(FeCl(3))>1/3(AlCl(3)). The nature of anions investigated has little effect on precipitation values of salts.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China. xjpeng@rcees.ac.cn
authors.forename: Xianjia
authors.initials: X
authors.lastname: Peng
authors.forename: Jianjun
authors.initials: J
authors.lastname: Jia
authors.forename: Xuemin
authors.initials: X
authors.lastname: Gong
authors.forename: Zhaokun
authors.initials: Z
authors.lastname: Luan
authors.forename: Bin
authors.initials: B
authors.lastname: Fan
mesh_terms: D011232:Chemical Precipitation; D037742:Nanotubes, Carbon / Q000737:chemistry*; D017942:Nitric Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D012492:Salts; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D014867:Water
chemical_list: D037742:Nanotubes, Carbon; D012492:Salts; D014867:Water; D017942:Nitric Acid