The ideal (theoretical) strength was originally defined as the stress or strain at which perfect crystal lattice became mechanically unstable with respect to arbitrary homogeneous infinitesimal deformation. This has been intensely investigated because the ultimate strength without defects is a fundamental mechanical characteristic of materials. In the analyses, the instability criteria have bee...

The effects of electronic properties of inner and outer surfaces of Carbon Nano Tubes (CNTs) on the deactivation of cobalt Fischer-Tropsch (FT) catalysts were studied. The comparative characterization of the fresh and used catalysts by TEM, XRD, TPR, BET and H2 chemisorption showed that cobalt re-oxidation, cobalt-support interactions and sintering are the main sources o...

Theoretical analysis and Computer simulations have proven to be cost-effective and powerful tools in scientific studies of materials, particularly at nano-scale where synthesis of nano-structures, interpretation of their observed character and exploration of new structures are not always straight forward. We present here fundamental principles of techniques used today for computational simulati...

Drug delivered can have significant effect on its efficacy. Some drugs have an optimum concentration range with in which maximum benefit is derived and concentrations above (or) below the range can be toxic or produce no therapeutic effect. Various drug delivery and drug targeting systems are currently under development. The main goal for developing such delivery systems is to minimize drug deg...

Abstract The introduction of carbon nanotubes (CNTs) in the preparation nano-lead oxide (PbO) can effectively solve problem easy agglomeration oxide. This study used concentrated nitric acid and sulfuric mixed (volume ratio 1:3) to oxidize at 90 °C temperature for 0.5 h. Using oxidized CNTs as carriers, Pb(OAc) 2 · 3H O precursor, ammonia a precipitator, PbO/CNTs complexes were prepared by chem...

in this investigation a simplified arc discharge apparatus was used to synthesize mullti-wall carbon nanotubes. because of not requiring vacuum equipment, heat exchange system, active or inert gases, this method is found to be cheaper and simpler than traditional arc discharge in gas environment. using this method, cnts are produced by performing an arc discharge between two graphite electrodes...

The numerical scrutiny of unsteady incompressible magneto-hydrodynamics (MHD) for blood flow in carbon nano tubes (CNTs), past a sensor surface has been presented under the influences viscous dissipation, resistive heating, and thermal radiation. variables without having dimensions have deployed to alter reigning equations, which are non-linear, coupled partial differential equations (PDEs), in...

A possible way to increase thermal conductivity of working fluids, while keeping pressure drop at acceptable levels, is through nanofluids. Nanofluids are nano-sized particles dispersed in conventional fluids. great number materials have potential be used nanoparticles production and then nanofluids; one them Multi-Walled Carbon Nano Tubes (MWCNT). They around 3000 W/mK other as like CuO 76.5 W...