I t has been recognized for some time that it is necessary to subdivide colloids into two groups, the hydrop~lic and the hydrophobic colloids, according to the influence of electrolytes on their precipitation. To the hydrophilic colloids belong among others proteins and soaps, and to the hydrophobic colloids, collodion, mastic, graphite, metal oxides, etc. The hydrophobic colloids (such as mast...

Abstract In this paper, we review recent research developments regarding the tribological performances of a series inorganic nano-additives in lubricating fluids. First, examine several basic types nanomaterials, including metallic nanoparticles, metal oxides, carbon and “other” nanomaterials. More specifically, nanoparticles include silver, copper, nickel, molybdenum, tungsten nanoparticles; o...

A recently developed empirical dispersion correction (Grimme et al., J. Chem. Phys. 2010, 132, 154104) to standard density functional theory (DFT-D3) is implemented in the plane-wave program package VASP. The DFT-D3 implementation is compared with an implementation of the earlier DFT-D2 version (Grimme, J. Comput. Chem. 2004, 25, 1463; Grimme, J. Comput. Chem. 2006, 27, 1787). Summation of empi...

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...

Lubrication of steel using two-dimensional (2D)-materials has been a growing interest in recent years at the macro/microscale for wide range applications including lubricating 440 C-steel satellite and automotive components. This work takes new approach comparing tribological behavior ultrathin-graphite ultrathin-MoS2 varying humidity against custom-fabricated counter-surface friction force mic...