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The fluorine doped amorphous carbon nanoparticles (a-C:F NPs) films with sizes 50–100nm were deposited on polyethylene terephthalate in an atmosphere of CF 4 by a 90°-bend magnetic filtered cathodic arc plasma system. The surface morphology of a-C:F NPs films was observed by field emission scanning electron microscope and atomic force microscope. The microstructure and chemical bonding nature...
The inhibition effectiveness of thermally deposited phosphorus (P) compounds on the carbon oxidation catalyzed by potassium or calcium acetate has been investigated. The P deposit was formed by impregnating carbon/carbon composite samples with methanol solution of methyl-phosphoric acid or phosphorus oxychloride and heating at ca. 600°C. An amorphous layer formed by a relatively large amount of P...
Activated carbon modified by HNO 3 was used as the support during the production of TiO 2 by metal organic chemical vapor deposition (MOCVD). The HNO 3 modification increased mesopores surface area of activated carbon indicating the size of pores increased. The concentration of surface oxygen bearing groups on the HNO 3 modified activated carbon was much higher than...
Mesoporous carbon–ceramic honeycomb monoliths were prepared for catalyst supports by a polymer blend approach. In these monoliths, vanadium was supported by ion exchange of the cationic precursor with the protons of oxygenated surface groups. Previously to vanadium incorporation, the carbon–ceramic monoliths were oxidized using different agents under various conditions to get different oxidation degrees...
Water-soluble amino acid derivatives of gadolinium (Gd) endohedral metallofullerenes (AAD-EMFs), Gd@C 82 O m (OH) n (NHCH 2 CH 2 COOH) l (m≈6, n≈16 and l≈8) are synthesized by a direct reaction of the pure endohedral metallofullerene Gd@C 82 with an excess of alkaline solution of β-alanine. The structure of the AAD-EMFs is characterized by FTIR,...
We have studied the dynamic mechanical behavior of poly(methyl methacrylate) (PMMA)/acidified multiwalled carbon nanotube (MWNT) composites compatibilized with amine-terminated poly(ethylene oxide) (PEO-NH 2 ). PEO-NH 2 is ionically associated with acidified MWNTs via ionic interaction as shown by XPS and FTIR. The miscibility between PEO and PMMA improves the interfacial adhesion...
X-ray absorption near-edge structure (XANES) spectroscopy and photoelectron spectroscopy (PES) have been used to investigate single-walled carbon nanotubes (SWNTs) modified by immersion in a HBr solution at room temperature. After treatment XANES spectra of SWNTs show a new pronounced feature, which has been assigned to new bonds between the sidewall of the SWNTs and Br atoms. This investigation demonstrates...
Covalent fluorescent labeling of surface species (FLOSS) was used to detect relatively low concentrations of surface functional groups (OH, COOH and CHO) on activated carbon fiber surfaces. The chromophores were attached to the surface through a reaction specific to each type of surface functional group. FLOSS indicated the presence of 8.7×10 11 COOHgroups/cm 2 and 1.3×10 12 ...
We present a near edge X-ray absorption fine structure spectroscopy characterization of nanostructured carbon films containing carbynoid species. By a careful data analysis and normalization of the spectra at the carbon K-edge we have quantitatively evaluated the extent of valence sp hybridization of the films. A sp/sp 2 ratio between 10% and 25% has been obtained. This result allowed the...
Aluminium oxide reduction was performed in a laboratory electrolysis cell with different industrial carbon cathode blocks (semi-graphitic, graphitic, and graphitized blocks). During electrolysis, sodium species migrate from the bath into the carbon cathode. Consequences of this migration include expansion of the blocks—the so-called sodium swelling—that may lead to failure of the cell. Characterisation...
The amines octadecylamine, 2-aminoanthracene, 1-H,1-H-pentadecafluorooctylamine, 4-perfluorooctylaniline and 2,4-bis(perfluorooctyl)aniline, have been reacted with chemically modified single-walled carbon nanotubes (SWCNTs). The chemical modification consisted on a thermal treatment in air of arc discharge-grown SWCNTs with an optional purification with HNO 3 . The selected amines have been...
Activated carbon fibers were prepared from Nomex® [poly(m-phenylene isophthalamide)] by either H 3 PO 4 activation, H 3 PO 4 –CO 2 activation, or simply CO 2 or steam activation. These treatments converted amide groups from the polymer precursor into complex and heterogeneously distributed nitrogen functionalities. TPD, XPS and XANES were used to study...
The preparation of cheap nitrogen-enriched materials with large adsorptive capacities and selectivity towards volatile organic compounds remains a challenge. Ammoxidation has been used to prepare nitrogen-enriched activated carbons using a demineralised Polish lignite. The lignite samples were demineralised by two different methods before nitrogen-enrichment by ammoxidation and physical activation...
Single layers of C 60 mono- and bis-adducts have been obtained by functionalizing an acid-terminated self-assembled monolayer (SAM) of thiols on gold. X-ray photoelectron spectroscopy demonstrated the grafting onto the SAM by covalent bonding, via the formation of an amide bond, while cyclic voltammetry and electrochemical impedance spectroscopy provided information on the redox properties...
Sulfur forms deposited on carbonaceous surfaces after exposure to hydrogen sulfide were analyzed using XPS and XANES. Higher temperatures promote the formation of organic sulfur and the presence of H 2 S during the cooling process increased elemental sulfur content. Temperatures between 400–600°C were found to be optimal for producing effective mercury uptake sorbents. The increased amount...
Fulleropyrrolidine and pyrrolidine derivatives were studied using X-ray photoemission spectroscopy in order to determine the effects of the C 60 -cage on the pyrrolidine nitrogen, as well as the influence of further derivatisation. Charge transfer from the carbon pyrrolidine ring to the C 60 -cages is observed and this charge redistribution influences not only the carbon atoms but...
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