The paper presents results of rheological experiments on viscosity under anisotropic pressure and in electric field of diethylene glycol-based MgAl2O4 nanofluids. Nanofluids have been prepared in a two-step method. The dynamic viscosity of nanofluids with various mass concentrations of nanoparticles was measured in the range of shear rates from 10 s -1 to 1,000 s -1 in constant temperature unde...

Nanopowders of Al2O3, TiO2 and MgO were fabricated by high energy ball milling. The simutaneous synthesis and sintering of nanostuctured MgAl2O4-Mg3Al4Ti3O25 composite was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. A highly dense nanostructure...

Today, bi - reforming of methane is considered as an emerging replacement for the generation high-grade synthesis gas (H2:CO = 2.0), and also encouraging renewable energy substitute fossil fuel resources. For achieving high conversion levels CH4, H2O, CO2 in this process, appropriate operation variables such pressure, temperature molar feed constitution are prerequisites yield gas. One biggest ...

In this work, a transparent nanostructured ceramic magnesium aluminate spinel (MgAl2O4) was fabricated by Spark Plasma Sintering (SPS) from commercial nano-powders at different temperatures (1300, 1350 and 1400 °C). The sintered samples were thoroughly examined to assess their microstructural, optical, mechanical properties. Various techniques such as SEM, AFM, spectrophotometer with an integra...

Non-convergent cation ordering in the (Fe3O4)1-x(MgAl2O4)x solid solution was investigated using in-situ time-of-flight neutron powder diffraction. The approach to equilibrium in a sample with x = 0.75 was observed at 923 K by performing in-situ structure refinements at intervals of 5 min, and the ordering behavior was traced through the time-dependence of the lattice parameter, the cation-oxyg...

Research is being actively conducted to improve the carbon deposition and sintering resistance of Ni-based catalysts. Among them, Al2O3-supported Ni catalyst has been broadly studied for dry reforming reaction due its high CH4 activity at beginning reaction. However, there a problem deactivation Ni/Al2O3 Ni, which catalytically active material. Supplementing MgO in can result an improved MgAl2O...

This review considers problems related to design of efficient structured catalysts for natural gas and biofuels transformation into syngas. Their active components are comprised fluorite, perovskite spinel oxides or their nanocomposites (both bulk supported on high surface area Mg-doped alumina MgAl2O4) promoted by platinum group metals, nickel alloys. A complex modern structural, spectroscopic...

Nanoindentation tests were performed on nanostructured transparent magnesium aluminate (MgAl2O4) ceramics to determine their mechanical properties. These tests were carried out on samples at different applied loads ranging from 300 to 9,000 μN. The elastic recovery for nanostructured transparent MgAl2O4 ceramics at different applied loads was derived from the force-depth data. The results revea...