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Hydrogen was adsorbed on carbon coils under 10 MPa hydrogen gas at liquid nitrogen temperature. The equilibrium pressure of hydrogen desorbed from the as-grown carbon coils with an amorphous structure was three to four times greater than those of multiwall carbon nanotubes (MWNT) and active carbons (AC). The heat treatment of the carbon coils at 850 o C contributed to an increase in hydrogen...
Pyrolytic carbon layers were deposited from methane on planar substrates (pyrolytic boron nitride) at various residence times, methane pressures and deposition temperatures. The depositions were performed in a cavity oriented perpendicular to the gas flow. The small surface area/reactor volume ratio of the reactor geometry allows depositions in the growth and nucleation mechanism. Transmission electron...
An investigation was conducted to determine how the aspect ratio of single walled carbon nanotubes (SWNTs) affects the dynamics of epoxy/amine networks at various stages of cross-linking. A new insight at the molecular level was obtained by employing a novel experimental approach based on simultaneous dielectric-infrared measurements. In particular, evidence was found which supports the formation...
A series of carbon films have been prepared by plasma-based ion implantation (PBII) with C on pure Al and Si. Emphasis has been placed on the effect of implanting voltage on the characteristics of these films. The structures of the films were analyzed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The morphologies were observed by atomic force microscope (AFM). Surface hardness...
We present the results on the fabrication and characterization of high-quality transparent heterojunction between n-type ZnO film and p-type diamond single crystalline film on the substrate of diamond bulk single crystal. The results indicated that the current density of the fabricated p-n junction reaches 110 A/m 2 when the forward bias voltage is 2.5 V, and the turn-on voltage value is about...
This paper describes an integrated granular activated carbon (GAC) adsorption/microwave (MW) irradiation process used for the treatment of high concentration pentachlorophenol (PCP) wastewater. Firstly, PCP in water was adsorbed onto GAC, then the PCP was decomposed and GAC regenerated by MW irradiation. The liquid and gas produced during irradiation were collected through condensing, and absorbed...
Carbon membrane materials are becoming more important in the new era of membrane technology for gas separation due to their higher selectivity, permeability and stability in corrosive and high temperature operations. Carbon membranes can be produced by pyrolysis of a suitable polymeric precursor under controlled conditions. This paper reviews the fabrication aspects of carbon membranes, which can...
Creamy white powders were obtained by the chemical vapor reaction of carbon tetrachloride and ammonia at 1000 o C, followed by washing with boiling water. The composition of the material was C 3 N 5.5 O 0.5 H 5.4 , having a nitrogen content greater than that of the hypothetical hard material C 3 N 4 . The powders...
Natural graphite particles with a high crystallinity, which were sieved to obtain particles less than 63 μm, were ground with a ball mill under a dry atmosphere and various alcoholic vapors such as i-C 3 H 8 OH, n-C 3 H 8 OH, C 2 H 5 OH, and CH 3 OH. The size and flakiness of the ground products and the electrical conductivity of the films made...
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