graphite oxide constitutes carbon network with oxygen atoms both on hexagonal arrangement and the edge sites. structural and electronic properties for graphite-oxygen complexes have been explored using first-principles total-energy calculations within the local density approximation (lda). band structures and density of states for the propose carbon 3d models are reported. a finite energy gap and...

In this study, Aluminium2024- Graphite composites containing 5, 10, 15 and 20 weight percent of graphite were produced by solid assisted melt disintegration (SAMD) technique which resulted in production of Al/Gr powder mixtures which subsequently consolidated and sintered for preparation of Al/Gr composites. In this technique, powder mixture was prepared by addition of flake graphite (mean diam...

Layer-by-layer (LBL) assembly of polyelectrolyte multilayers (PEM) has become a ubiquitous process for creating functional ultrathin films. Introduced by Decher, the simple deposition of two oppositely charged polyions can be performed on many types of surfaces giving them new functionality based on the type of polyelectrolytes utilized. Incorporating new functional materials such as nanopartic...

available online at http://meteoritics.org 1255 © Meteoritical Society, 2003. Printed in USA. Carbon isotope fractionation between graphite and diamond during shock experiments Teruyuki MARUOKA,1†* Christian KOEBERL,1 Jun-ichi MATSUDA,2 and Yasuhiko SYONO3 1Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria 2Department of Earth and Science, Gradua...

Density functional theory was used to study the effects of different types of oxygen-containing functional groups on the adsorption of oxygen molecules and single active oxygen atoms on carbonaceous materials. During gasification or combustion reactions of carbonaceous materials, oxygen-containing functional groups such as hydroxyl(-OH), carbonyl(-CO), quinone(-O), and carboxyl(-COOH) are often...

A dual-gate InSb nanosheet field-effect device is realized and used to investigate the physical origin controllability of spin-orbit interaction in a narrow bandgap semiconductor nanosheet. We demonstrate that by applying voltage over dual gate, efficiently tuning can be achieved. also find presence an intrinsic at zero identify its as build-in asymmetry layer structure. Having strong controlla...

The nature and composition of the surface of pyrolytic graphite and the consequent possible effects, when the material is used as an electrode. are considered on the basis of the structure of the graphite and of the handling and/or treatment to which the electrodes may have been exposed. Because of the relatively limited studies on pyrolytic graphite, certain aspects of the behavior of other ty...

In this present work effect of temperature and graphite contents on the microstructural and mechanical properties of iron based powder metallurgy freeform was studied. The different graphite contents (0%, 2%, 5% and 10%) were mixed in iron powder and compact them in 100 KN. These specimens were sintered at 7000 C, 8500 C and 10000 C in muffle furnaces. Microstructural properties were evaluated ...

We report simulations of the elastic scattering of atomic hydrogen isotopes and helium beams from graphite (0001) surfaces in an energy range of 1-4 eV. To this aim, we numerically solve a time-dependent Schrödinger equation using a split-step Fourier method. The hydrogen- and helium-graphite potentials are derived from density functional theory calculations using a cluster model for the graphi...

The UK nuclear power industry is predominantly based on gas-cooled, graphite moderated reactors with their being 20 operating and 6 shutdown Magnox reactors. The radioactive graphite issues associated with the Magnox reactors relate mainly to the reactor core graphite but, at two of the stations, there is also another graphite waste stream which results from the handling of their particular des...