The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A highly effective hydroxylated-functionalization of carbon fibres for use as electrodes of all-vanadium redox flow battery (VRFB) was developed. Carbon paper made of carbon fibres was hydroxylated ultrasonically with mixed acids (H 2 SO 4 /HNO 3 , VH2SO4/VHNO3=3/1) in a Teflon-lined stainless steel autoclave for different time at 80°C. The structure, composition, and electrochemical...
Carbon xerogels synthesized with a fixed resorcinol/sodium carbonate molar ratio (R/C) were physically activated using CO 2 . The effect of activation temperature and activation time on the final properties of the activated carbon xerogels was evaluated. The specific surface area increases from ∼600m 2 g −1 to 2000m 2 g −1 and more by increasing the temperature...
We developed a simple, rapid and highly efficient flame synthesis method for direct growing carbon nanofibers (CNFs) on carbon paper (CP) using a common laboratory ethanol flame as both heat and carbon sources. High density CNFs with tangled solid-cored structure were uniformly formed over the Ni-plated CP surface in ∼20s. The morphologies of the CNFs were characterized by scanning electron microscopy...
We synthesized centimeter-scale single- to few-layer graphene (FLG) films via chemical vapor deposition (CVD) on Ni foils. We demonstrates that the precipitation mechanism may not be the only important mechanism in the formation of graphene by CVD in Ni system, and that controlling the cooling rate in the CVD process may not be the appropriate way to control the thickness of graphene films. In addition,...
A simple and precise method for determining the point of gelation in microwave-assisted synthesis of organic gels is reported. This method provide a relevant information in the carbon gels field, as it can be applied to stop the gelation process at the precise instant for using the material in further processes where it is necessary to have the material with a specific viscosity (i.e., point of gelation).
Dapsone is an anti-microbial and anti-inflammatory drug. Water-dispersible dapsone-modified multi-wall carbon nanotubes (dap-MWCNTs) were prepared by chemical modification of the carboxyl groups introduced on the surface of the nanotubes using O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA). The modification was confirmed by...
We investigated the effect of the reaction parameters on the structure of multi-walled carbon nanotubes containing different concentrations of nitrogen and boron. The nanotubes were produced using a ‘standard’ aerosol chemical vapour deposition technique in conjunction with benzylamine, triethylborane, hexane and toluene mixtures. These precursors were thermally decomposed between 800 and 1100°C under...
An azobenzene molecule (AZO) with a flexible alkyl chain was attached to the sidewall of few-walled carbon nanotube (FWCNT) to form a FWCNT-chain-AZO hybrid by covalent bonding. Transmission electron microscopy image shows individually well-dispersed FWCNT packed underneath AZO molecules. The flexible spacer between the FWCNT and the AZO led to the efficient photoisomerization and thermal reversibility...
A new route for the synthesis of silicon nanoparticle (Si NP)/carbon nanotube (CNT) composites by a low-temperature magnesiothermic reduction process is presented. The size of the Si NPs can be controlled by varying the silica (SiO 2 ) thickness of SiO 2 /CNT precursors. The structural and morphological characterizations of the Si NP/CNT composites have been carried out using powder...
A first stage binary graphite intercalation compound was synthesised in the lithium–europium–graphite system by direct immersion of a pyrolytic graphite platelet in a molten lithium-based alloy with a well chosen Li/Eu ratio at 350°C. The as-obtained bulk EuC 6 compound exhibits mono-layered intercalated sheets of europium surrounded by two graphene sheets with a repeat distance equal to 487pm...
We analyzed defects created by low-energy irradiation in single-wall carbon nanotubes (SWCNTs) using Raman spectroscopy. The analysis is based on the recovery curves of the G/D ratio and there is no need to assume a specific functional form between the G/D ratio and the defect density. The obtained activation energies of defect healing are 0.7 or 1.4eV, depending on the extent of the damage, which...
Polyhedral silica nanofoam (PNF-SiO 2 ) analogues of dry soap froths with minimal surface area were used as templates for making polyhedral carbon nanofoams (PNF-C). Furfuryl alcohol or triblock copolymers were used as carbon sources. The volume of carbon precursor relative to the internal pore volume of PNF-SiO 2 ’s was systematically varied between 50% and 100% in order to investigate...
The adhesion of single-walled carbon nanotubes to the surface of graphene has been studied, mixing shortened tubes of different chiralities and few-graphene crystal membranes. The spontaneous atomic match of the two lattices was directly imaged using high-resolution transmission electron microscopy and carefully analyzed by means of electron diffraction, and we found evidences that surfaces of few-graphene...
Processes involved in using SiO 2 particles as catalysts for stacked-cup carbon nanotube formation in a spray pyrolysis chemical deposition method from ethanol were investigated. In addition, the recyclability of the SiO 2 substrates is investigated. The SiO 2 particles are shown to reduce to SiC. Moreover, the addition of triethylborate to produce boron species, and extended...
Differences of the electric response of metallic and semiconducting single-walled carbon nanotubes (SWCNTs) to a DC electric field applied by the tip of a scanning probe microscope are reported. We show that conventional Electric Force Microscopy (EFM) images can be used to directly distinguish metallic from semiconducting SWCNTs on a process-free sample. Not only the magnitudes of their response...
Deposition of amine-functionalized carbon nanofibers (CNFs) on the surface of carbon fibers (CFs) using water as dispersive medium was achieved by a two-stage scalable electrophoretic process. The resulting hybrid CNF–CF layers showed uniform distribution and microfiber wrapping of amidized-CNFs not seen when depositing oxidized-CNFs on the same substrate. Such layers provide potential for improving...
In contrast to conventional solid materials used as precursors for carbon materials, which are typically organic polymers and macromolecules, a solid of relatively small organic molecules mixed with metal salts was directly used to form a functional carbon material. Heat treatment of a mixture of 1,4-diamino-2,3-dicyano-9,10-anthraquinone, Fe gluconate, and Mg acetate produced a highly porous carbon...
Activated carbon samples have been prepared by heating China fir (Cunninghamia lanceolata) wood impregnated with phosphoric acid in an effort to elucidate the effect of the heating history of impregnated material on the porous texture of the activated carbon. Analysis of the pore structure of the activated carbon in terms of nitrogen adsorption isotherms showed that both using an intermediate isothermal...
An azobenzene (AZO) chromophore was covalently attached to graphene oxide (GO) through an amide linkage. The microstructure of the GO–AZO hybrid was characterized by microscopic and X-ray diffraction methods. An internal short-range ordered crystalline structure similar to graphite was observed. Spectroscopic evidence testified the strong electronic interactions between the AZO and GO in this GO–AZO...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.