Showing papers in "Carbon in 2005"

TL;DR: In this article, experimental conditions and mathematical fitting procedures for the collection and analysis of Raman spectra of soot and related carbonaceous materials have been investigated and optimised with a Raman microscope system operated at three different laser excitation wavelengths (514, 633, and 780 nm).

TL;DR: In this article, high resolution XPS analysis of chemical functionalised multi-wall carbon nanotubes (MWCNTs) and single wall carbon nanotsubes (SWCNT) was done with ESCA300 (overall instrument resolution of 0.35 eV).

TL;DR: In this paper, the effects of different dispersion states of carbon nanotubes (CNTs) on rheological, mechanical, electrical, and thermal properties of the epoxy nanocomposites were studied.

TL;DR: In this paper, multi-walled carbon nanotubes after modified by using a H2SO4 and HNO3 mixture solution were added to cement matrix composites to improve the flexural strength, compressive strength, and failure strain.

TL;DR: In this paper, the authors suggest that the limitation of C g can be attributed to a space constriction for charge accommodation inside the pore walls, and that the use of extremely high surface area carbons for EDLCs may be unprofitable.

TL;DR: In this paper, a new method based on optical microscopy is proposed for the determination of MWCNT solubility in concentrated aqueous-suspensions, which is found to correlate well with the area ratio of the G and D bands from the Raman spectrum.

TL;DR: In this paper, a linear relation between hydrogen uptake and specific surface area (SSA) was obtained for all samples independent of the nature of the carbon material, and the best material with a SSA of 2560m 2 /g showed a storage capacity of 4.5% at 77 K.

TL;DR: In this paper, the mechanism of porosity development during chemical activation by KOH and NaOH using various multiwalled nanotubes (MWNTs) of different structural organization was obtained.

TL;DR: In this article, the specific capacitance and the hydrogen adsorption capacity in the carbon nanopores were correlated with the microtextural properties, and a linear dependence has been found between the capacitance or the amount of electrochemically stored hydrogen and the ultramicropores (pores smaller than 0.7nm).

TL;DR: In this article, the preparation of metal-doped carbon aerogels, their physico-chemical surface properties and their applications as catalysts in various reactions are discussed, such as adsorption and catalysis.

TL;DR: In this article, surface modification of coal-based activated carbon (F400) was performed using thermal and chemical methods using Fourier transform infra red (FTIR) spectroscopy, pH titration, zeta potential measurements and sodium uptake capacity results.

TL;DR: In this article, the electrical conductivity of oxidized multiwalled carbon nanotubes (MWNT)/epoxy composites is investigated with respect to the chemical treatment of the MWNT.

TL;DR: In this article, a highly oxidized graphite oxide was synthesized from natural graphite powder by oxidation with KMnO4 in concentrated H2SO4 followed by hydrolysis, washing and centrifugation.

TL;DR: In this article, uniform dispersion of single-walled carbon nanotubes (SWNTs) in isotactic polypropylene (iPP) was achieved by shear mixing.

TL;DR: In this article, the core aggregates having a diameter range of 100-200 nm are extremely tight and could not be broken up by any known method of de-aggregation.

TL;DR: In this article, the effect of porosity and surface chemistry on the adsorption of two VOCs (benzene and toluene) at low concentration (200 ppmv) was investigated.

TL;DR: The mechanical and structural properties of individual PAN-derived carbon nanofibers are presented in this article, where the Weibull fracture stress fit to this statistical distribution was 0.64 GPa with a failure probability of 63%.

TL;DR: In this article, the pore texture of both dry and pyrolyzed carbon gels depends on the drying process, and several more or less expensive methods (supercritical drying, freeze-drying, evaporative drying) were tested in order to determine which process is the most suitable for the synthesis of a porous carbon with a definite texture.

TL;DR: In this paper, the thermal performance of nanocomposite carbon nanofibers filled paraffin wax was studied experimentally and analytically and the transient temperature response of made nanocomposition was measured during its solidification process and the cooling rate was predicted.

TL;DR: In this paper, the synthesis of doped polyaniline in its emeraldine salt form (PANI-ES) with carboxylic groups containing multi-walled carbon nanotubes (c-MWNTs) via in situ polymerization is described.

TL;DR: In this paper, a large number of porous carbon materials with different properties in terms of porosity, surface chemistry and electrical conductivity, were prepared and systematically studied as electric double layer capacitors in aqueous medium with H2SO4 as electrolyte.

TL;DR: In this paper, the electrical and mechanical properties of the epoxy-VGCF nanocomposite sheets with different weight percentages of VGCFs were discussed, and the results were that both had maximum tensile strength and Young's modulus at 5.5% for both materials and reduced the fracture strain with increasing filler content.

TL;DR: In this paper, the surface chemistry of activated carbon adsorbents was investigated by elemental analysis, cation exchange capacity (CEC, measured by neutralization of NaOH with acidic surface groups), infrared spectroscopy and potentiometric titration.

TL;DR: In this paper, the authors investigated the thermal degradation of wood biopolymers and evolution of the atomic/molecular and mesoscopic structure of the carbonaceous material by wideangle X-ray scattering, small-angle Xray scattering and Raman spectroscopy, and concluded that the unique microfibril orientation of cellulose in the native wood cell wall might affect the carbon composite material.

TL;DR: In this article, a large-scale production of pure carbon spheres, with diameters from 50nm to 1μm, has been achieved via direct pyrolysis of a wide range of hydrocarbons, including styrene, toluene, benzene, hexane, cyclohexane and ethene, in the absence of catalyst.

TL;DR: In this article, carbon-supported catalysts were held at elevated temperatures under dry air conditions, and the carbon support was evaluated with a first-order kinetic model to describe the results.

TL;DR: In this article, single-walled carbon nanotubes (CNTs) were synthesized at different conditions by a novel aerosol method based on the introduction of pre-formed iron catalyst particles into conditions leading to CNT formation.

TL;DR: In this article, a continuous heating transformation (CHT) diagram was constructed from kinetic data and used to predict the optimum heating rate for thermostabilization; a heating rate of 0.06°C/min or lower was required in order to maintain T g ǫ>ǫ T during lignin degradation.

TL;DR: In this article, the structure and nature of the resulting Ag/MWNT composite were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD), the results show that the electrochemically synthesized Ag nanoparticles were homogeneously dispersed and well-separated from one another on the modified MWNT surfaces.