scholarly journals How to remove the influence of trace water from the absorption spectra of SWNTs dispersed in ionic liquids

2011 ◽  
Vol 2 ◽  
pp. 653-658 ◽  
Author(s):  
Juan Yang ◽  
Daqi Zhang ◽  
Yan Li
Keyword(s):  
Ionic Liquids ◽  
Absorption Spectra ◽  
Pure Water ◽  
High Concentration ◽  
Quantitative Characterization ◽  
Intrinsic Structure ◽  
Nir Absorption ◽  
Walled Carbon Nanotubes ◽  
Trace Water

Single-walled carbon nanotubes (SWNTs) can be efficiently dispersed in the imidazolium-based ionic liquids (ILs), at relatively high concentration, with their intrinsic structure and properties retained. Due to the hygroscopicity of the ILs, water bands may be introduced in the absorption spectra of IL-dispersed SWNTs and cause problems in spectral deconvolution and further analysis. In order to remove this influence, a quantitative characterization of the trace water in [BMIM]+[PF6]− and [BMIM]+[BF4]− was carried out by means of UV–vis-NIR absorption spectroscopy. A simple yet effective method involving spectral subtraction of the water bands was utilized, and almost no difference was found between the spectra of the dry IL-dispersed SWNT samples treated under vacuum for 10 hours and the spectra of the untreated samples with subtraction of the pure water spectrum. This result makes it more convenient to characterize SWNTs with absorption spectra in the IL-dispersion system, even in the presence of trace amount of water.

Quantitative Characterization of Lewis Acidity and Activity of Chloroaluminate Ionic Liquids

2016 ◽  
Vol 55 (46) ◽  
pp. 11878-11886 ◽  
Author(s):  
Xuan Zhang ◽  
Rui Zhang ◽  
Haiyan Liu ◽  
Xianghai Meng ◽  
Chunming Xu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Lewis Acidity ◽  
Quantitative Characterization

scholarly journals Detection of Redox Properties of (6,5)-Enriched Single-Walled Carbon Nanotubes Using Potassium Permanganate (KMnO4)

2020 ◽  
Vol 6 (2) ◽  
pp. 30
Author(s):  
Yuji Matsukawa ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectra ◽  
Near Infrared ◽  
Single Walled Carbon Nanotubes ◽  
Redox Properties ◽  
Single Walled Carbon ◽  
Langmuir Adsorption ◽  
Oxidizing Power ◽  
Nir Absorption ◽  
Walled Carbon Nanotubes

It has been reported that even if single-walled carbon nanotubes (SWNTs) are coated with the same polymer, the redox characteristics change of each chirality may differ. Particularly, the addition of hydrogen peroxide (H2O2) minimally affects the near-infrared (NIR) absorption spectra of the dsDNA-(6,5)-enriched SWNT complex (DNA-SWNT complex). Detecting the redox properties of (6,5) chirality using NIR absorption spectra has been one of the issues to be solved. We hypothesized that an oxidizing agent with high oxidizing power is required to detect the absorption spectra of (6,5) chirality. In this study, we used KMnO4, which contains atoms with a high oxidation number. A dispersion was prepared by mixing 0.5 mg of (6,5)-enriched SWNT powder with 1 mg/mL of DNA solution. After adding H2O2 or KMnO4 to this dispersion and oxidizing it, catechin solutions were added to reduce the dispersion. The absorption peak of the DNA-SWNT complex decreased by 23.9% following the addition of KMnO4 (final concentration: 0.5 µM) and recovered 30.7% following the addition of the catechin solution. We revealed that the changes in the absorption spectra change of (6,5) chirality, which could not be detected by H2O2, can be detected by using KMnO4. We also varied the concentration of KMnO4 and verified whether the adsorption of KMnO4 can be modeled as a Langmuir adsorption isotherm.

Preparation and characterization of biocompatible molecularly imprinted poly(ionic liquid) films on the surface of multi-walled carbon nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 43526-43538 ◽  
Author(s):  
Haoyuan Ding ◽  
Rongfeng Chen ◽  
Mingming Liu ◽  
Rong Huang ◽  
Yamei Du ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Films ◽  
Molecularly Imprinted ◽  
Multi Walled Carbon Nanotubes ◽  
Poly Ionic Liquid ◽  
Walled Carbon Nanotubes ◽  
Anion Species

A series of novel biocompatible MIPs were synthesized for BSA recognition by using MWCNTs with different outside diameters as substrates, and allyl-functionalized ionic liquids with different anion species as monomers.

Sign in / Sign up

Export Citation Format

Share Document