In this paper, a hydroxylated graphite surface is generated as a hydrophilic oleophobic material for the application of oil-water separation, and the effects of hydroxyl density on the three-phase wettability are studied in oil-water-graphite systems. We analyze the adsorption of water molecules on the hydroxylated surfaces and obtain the relationship between water-oil-solid interfacial propert...

The objective of this contract was the study of rocket faikire mechanisms in conjunction with the development of nozzle materials for solid propellant motors. Study of graphite comprised the major part of the program, with emphasis on erosion mechanisms. Commercial and experimental graphite grades were tested in an oxy-acetylene torch and the effects of graphite purity, density, orientation and...

The thermodynamics of solid/liquid interfaces under nanoconfinement has tremendous implications for liquid transport properties. Here using molecular dynamics, we investigate graphite nanoslits and study how the water/graphite interfacial tension changes with degree confinement. We found that, nanochannel heights between 0.7 nm 2.6 nm, becomes more hydrophobic than in bulk, that value surface o...

Oxidation is a serious problem for C/C composites above 4OOT, which limits their application at high temperatures. It is experimentally shown that boron (B), when substituting for C atoms in the graphite structure, may significantly improve the oxidation behavior of a C/C composite [l-4]. However, there is very little known about the role of boron in reducing the oxidation rate of graphite alth...

in this research graphene oxide was synthesized by two methods. these methods were achieved by changing the improved hummers’ and modified hummers’ methods. structure of graphene oxide was characterized by scanning electron microscopy (sem) images, x-ray diffraction (xrd) patterns, raman spectroscopy and fourier transform infrared (ftir) spectra. according to sem image, the thickness of graphen...

We directly observed molecular-thick aqueous salt-solution pancakes on a hydrophobic graphite surface under ambient conditions employing atomic force microscopy. This observation indicates the unexpected molecular-scale hydrophilicity of the salt solution on graphite surfaces, which is different from the macroscopic wetting property of a droplet standing on the graphite surface. Interestingly, ...

Innovative nanostructured materials offer the possibility of enhancing tribological performance traditional like graphite and molybdenum disulfide (MoS2). In this study, scratch resistance two different copper powders, dendritic spherical, their composites with MoS2, nanometric graphene nanoplatelets was investigated. Metal powder metallurgy employed to produce composite 5 wt% 10 each solid lub...