The information of carboxylated carbon nanotubes

To enhance its pseudocapacitance, ruthenium oxide must be formed with a hydrated amorphous and porous structure and a small size, because this structure provides a large surface area and forms conduction paths for protons to easily access even the inner part of the RuO2. In this study, we report that highly dispersed RuO2 nanoparticles could be obtained on carboxylated carbon nanotubes. This could be achieved by preventing agglomeration among RuO2 nanoparticles by bond formation between the RuO2 and the surface carboxyl groups of the carbon nanotubes. Highly dispersed RuO2 nanoparticles on carbon nanotubes showed an increased capacitance, which can be explained by the fact that with the decrease in size protons were able to access the inner part of RuO2, so that its utilization was increased. The high dispersion of RuO2 is therefore a key factor to increase the capacitance of nanocomposite electrode materials for supercapacitors.To functionalize our carboxylated carbon nanotubes  (produced by the CVD method), we perform a reflux in concentrated sulfuric / nitric acid. This process results in a large concentration of carboxyl (-COOH) groups on the nanotube surface, and also generates other groups. After functionalization, these carboxylated nanotubes have 2-7 wt% COOH by titration. These typically have a high zeta potential, varying from -30 to -70mV as a function of pH. Suspensions made from these nanotubes can be very stable.

Images below are FTIR spectrum and Raman Spectrum Data of our COOH functionalized Multiwall nanotubes. Click on the images to view in PDF. More analytical data can be requested via email.
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The characteristics of carboxylated carbon nanotubes

Carbon nanotubes have been idealized as vehicles for drug and gene targeted cell. The physicochemical properties of carbon nanotube also promote its function as a "thermal antennas" for the destruction of non-invasive cancer. Covalent Modification of carbon nanotubes is a result of acid purification resulting in carboxylated carbon nanotubes. In addition, this covalent modification allows the attachment of biological fragments for cell targeting. in contrast, the carboxyl carbon nanotubes are proposed to be cytotoxic to mammalian cells. the current study examines the potential cytotoxicity of short, carboxylated nanotubes of multi-walled carbon in vitro model of fibroblast culture of primary cells. cytotoxicity was assessed by vital staining using propidium iodide, and the other with an assay of lactate dehydrogenase color. results indicate a cytotoxic dose dependent relationship between the nanotubes carboxylated multiwall carbon tested and semiconductor fibroblast culture cells model.Carboxylated and metallic carbon nanotubes under transverse electric fields are studied by the functional theory density based on first principles calculations. the external field polarizes the system, resulting in a dipole moment induced electric field to the incident with the module depends directly on the field strength. the structural and electronic properties of the resulting system due to orbital hybridization between the nanotube and COOH states are shown to be affected by the applied field. These results open new perspectives for alternative uses,
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