Macroscopic concentration of massless charge carriers with linear conic spectrum Dirac Fermions (DF) was shown in 2004 to exist in Highly Oriented Pyrolytic Graphite (HOPG) and governs its electronic properties. These carriers can have the same nature as DF observed in graphite monolayer (Graphene) and let to view HOPG as superposition of 2D carbon layers, almost independent electronically. We ...

Recommendations are presented for the nomenclature and terminology of graphite intercalation compounds, i.e. compounds that retain the planarity of the layers in the graphite structure. Not included are compounds with covalent bonding of heteroatoms to the carbon atoms which leads to a sp3 hybridization of the carbon atoms and a corresponding loss of planarity of the layers. Rules for a structu...

Hydrophobicity properties of graphite and green synthesized graphene (gsG) from exfoliated graphite/GO towards polymer membrane characteristic and properties at different weight percentage concentrations (1, 2, 3, 4 and 5 wt. %) were investigated. PSf/graphite and PSf/gsG membranes were characterized in term of hydrophobicity, surface bonding, surface roughness and porosity. FTIR peaks revealed...

This thesis concerns the physicochemical understanding of radiation damage in graphite. It is structured in two parts, the first being a foundation of elastic and bonding properties in graphite and its intercalation compound with Bromine. The second builds on this with dislocation theory to analyse dimensional change and stored elastic energy. Part 1: Density functional theory (DFT) in the loca...

Pile Grade A graphite was used as a moderator and reflector material in the first generation of UK Magnox nuclear power reactors. As all of these reactors are now shut down there is a need to examine the concentration and distribution of long lived radioisotopes, such as 14C, to aid in understanding their behaviour in a geological disposal facility. A selection of irradiated graphite samples fr...

Based on density functional calculations, optimized structures of graphite oxide are found for various coverage by oxygen and hydroxyl groups, as well as their ratio corresponding to the minimum of total energy. The model proposed describes well known experimental results. In particular, it explains why it is so difficult to reduce the graphite oxide up to pure graphene. Evolution of the electr...

Magnetotransport measurements performed on several well-characterized highly oriented pyrolitic graphite and single crystalline Kish graphite samples reveal a reentrant metallic behavior in the basal-plane resistance at high magnetic fields, when only the lowest Landau levels are occupied. The results suggest that the quantum Hall effect and Landau-level-quantization-induced superconducting cor...

The multilayer graphene oxide membranes (MGOMs) are fabricated using graphite oxide synthesized using a rare form of high purity natural vein graphite (NVG) and are characterized using FE-SEM, AFM and C 1s and O 1s core level photoemission (ESCA) for their properties. It is observed that NVG based MGOM can be thermally reduced energy efficiently to obtain graphene-like membranes. Keywords—graph...

A ternary intercalation compound of graphite with AIF3 and F2, CXF(A1F3)J/ was prepared under fluorine atmosphere at temperatures of 20-400 °C. The typical 1st stage compound has a composition of C6F(AlF3)o,i5 with a repeat distance of 940 pm. Rapid progress in the reaction led of the formation of graphite fluoride, (C2F),,. ESCA spectra indicate that the chemical bond between host graphite and...

Introduction: Last year we reported the successful isolation of presolar graphite from Orgueil and presented C, N, O and Si isotopic ratios on individual graphite grains from seven density fractions, with grain sizes > 1μm (Table 1) [1, 2]. Except for fractions ORG1b and 1h, all fractions analyzed were found to contain presolar carbonaceous grains that are morphologically and isotopically simil...