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Molecule hydrogen is known to have a weak van der Waals potential, which makes it difficult to raise its storage efficiency for physisorption based methods. In this report, we explore the other side of such a weak potential, the well-known compressibility of hydrogen. A (20,0) single wall carbon nanotube based nanocontainer is designed, in which a C 60 “peapod” at the cap section of the nanotube...
A CNT stack formation technique is used for the pseudo in-situ monitoring of CNT growth in the kinetics-controlled regime. CNT stacks are fabricated by water-assisted selective etching and the cyclic introduction of ethylene into the chemical vapor deposition (CVD) reactor. By varying the growth temperature and the ethylene flow rate within growth cycles, the reaction was shown to be first order with...
Platelet graphite nanofibers have been characterized by scanning electron microscopy, transmission electron microscopy, electron diffraction, X-ray photoemission spectroscopy, and atomic force microscopy. The results show that the graphene sheets are stacked parallel to each other and are perpendicular to the fiber axis; the interlayer spacing is 0.34nm. A small fraction of carbon atoms are bonded...
The mechanisms by which carbon nanotubes nucleate and grow remain poorly understood. This paper reviews the models which have been proposed to explain nanotube growth in the arc-evaporation and laser-vaporisation processes. Many of the early models assumed that growth is a gas phase phenomenon but there is growing experimental evidence that the formation of both multiwalled and single-walled tubes...
Adsorption of hydrogen sulphide (H 2 S) onto activated carbons derived from oil palm shell, an abundant solid waste from palm oil processing mills, by thermal or chemical activation method was investigated in this paper. Dynamic adsorption in a fixed bed configuration showed that the palm-shell activated carbons prepared by chemical activation (KOH or H 2 SO 4 impregnation)...
Commercial carbon black, spark generator soot, Diesel soot from passenger car and high-purity graphite were used for the investigation of the reaction of carbonaceous materials with NO 2 applying diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The occurrence of infrared bands was analyzed as they were depending on the reaction temperature. The focus of interest was particularly...
A fabrication technique of high-purity vertically aligned single-walled carbon nanotubes (VA-SWCNTs) using atmospheric pressure plasma enhanced chemical vapor deposition is presented. Although densely mono-dispersed Fe–Co catalysts of a few nanometers is primarily responsible for VA-SWCNT growth, carbon precipitation was virtually absent in the thermal CVD regime at 700°C. On the other hand, high-purity...
Dense carbon nanotubes (CNTs) were grown via a thermal chemical vapor deposition process on titanium treated carbon cloths. The catalysts in the form of either platinum (Pt) or platinum–ruthenium (Pt–Ru) nano-sized particles were then deposited on the CNT surface by potentiostatic electrodeposition. After the deposition process, the surface morphology of prepared specimens was examined by scanning...
A carbon aerogel (CA) loaded with platinum nanoparticles can achieve good catalytic performance in proton exchange membrane fuel cells. Pt–Ru bimetallic nanoparticles were loaded onto a carbon aerogel through a simple process. The PtRu/CA achieved good cell performance when used as a direct methanol fuel cell anode catalyst. The advantages of carbon aerogel may be attributed to the mesopore structure...
A consolidated composite reactive bed for refrigeration sorption systems made from expanded graphite powder impregnated with CaCl 2 was produced and tested. The composite material was compressed under a pressure of 10MPa to enhance its heat transfer properties. Experimental results showed that this material could incorporate 0.90kg of NH 3 per kg of salt and that the agglomeration...
Systematic isothermal annealing has been carried out on catalytic chemical vapor deposition-derived highly disordered multi-walled carbon nanotubes in order to understand the structural evolution of carbon nanotubes kinetically. After specified isothermal time the crystallographic parameters strongly depend on annealing temperature, and can be divided into three stages. Rapid structural enhancement...
An electrochemical method for determining the number of carboxyl groups on glassy carbon (GC) has been developed. In this method, a carboxyl group is modified with 3,4-dihydroxybenzylamine (DHBA) by the action of carbodiimide. The number of carboxyl groups can be determined from the peak area of DHBA in cyclic voltammograms of GC. The physical adsorption of DHBA on GC is not desirable for this quantification...
Poly(styrene-β-isobutylene-β-styrene) (SIBS) is a block copolymer that has been used extensively as a coating for medical devices in which it acts as a carrier for therapeutics. In this study the incorporation of carbon nanotubes (CNTs) into SIBS coatings was investigated as a means of modifying both the electrical conductivity and the surface characteristics of the SIBS coatings in order to affect...
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the editor as it duplicates significant parts of a paper that had already appeared in: Langmuir-Blodgett Films of Single-Wall Carbon Nanotubes: Layer-by-layer Deposition and In-plane Orientation of Tubes. Jpn. J. Appl...
α-Iron filled multiwalled carbon nanotubes were prepared through filling of commercially available carbon nanotubes, after oxidative opening, with ferrofluid particles. After washing and reduction with hydrogen clean tubes filled with α-iron were obtained.
Poly(phenylenebutadiynylene) derivatives (PPBs) were synthesized and carbonized by thermolysis from room temperature to 900°C under flowing argon, affording porous carbonaceous materials in high yields. The nanostructures and the graphitization behavior of the carbonized materials were investigated by XRD, Raman, electron microscopy, and N 2 adsorption methods. The carbonized material was...
The collisions of a carbon atom with a single-wall carbon nanotube are investigated by means of the molecular dynamics modeling. The results show a variety of channels for the process depending on the collision parameters. The effective cross sections of the channels have been calculated. The kinetic model of the nanotube transformations is formulated and the rate coefficients as functions of temperature...
Cement reinforced with discontinuous carbon fiber is known for its piezoresistivity-based strain sensing ability, its electrical conductivity and the consequent multifunctionality. The high cost of carbon fiber is disadvantageous. Both carbon fiber and carbon black (used with silica fume in the amount of 15% by mass of cement) increase the DC conductivity and the EMI shielding effectiveness of cement,...
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