agal2o3 nanocomposite were synthesized by solution combustion technique using ammonium carbonate as a new fuel under simultaneous combustion of alumina and silver particles condition. samples prepared with different amount of silver, were characterized by xrd, bet, sem and optical absorption measurements. xrd analysis was used to determine the change in phase and size of the synthesized nanopar...

The effect of γ-Al2O3 nanoparticles on heat transfer rate, baffle spacing and pressure drop in the shell side of small shell and tube heat exchangers was investigated numerically under turbulent regime. γ-Al2O3-water nanofluids and pure water were used in the shell side and the tube side of heat exchangers, respectively. Since the properties of γ-Al2O3-water nanofluids were variable, they were ...

Significant progress has been made on the synthesis and application of mesoporous γ-alumina. To date, little attention has been paid to the synthesis of microporous crystalline alumina. Here, fabrication of microporous crystalline γ-alumina using a microporous covalent triazine framework (CTF-1) as a template is described. Microporous crystalline γ-alumina with a micro-meso binary pore system w...

Increasing the thermal conductivity of PDMS (polydimethylsiloxane) based microfluidics is an important issue for the thermal management of hot spots produced by embedding electronic circuits in such systems. This paper presents a solution for enhancing the thermal conductivity of such PDMS based microfluidics by introducing thermally conductive alumina (Al2O3) nanoparticles, forming PDMS/Al2O3 ...

The effect of submicron-sized Al2O3 particle addition on the crystal structure and superconducting properties of YBa2Cu3O7-δ ceramics was systematically studied. Series of YBa2Cu3O7−δ + x Al2O3 samples (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5,0.6 wt.% ) were prepared using the solid state reaction method. The lattice parameters and the orthorhombicity were decreased slightly with Al2O3 addition. No ch...

We report on our investigation of the electrical properties of metal/Al2O3/GaN metal-insulatorsemiconductor capacitors. We determined the conduction band offset and interface charge density of the alumina/GaN interface by analyzing the capacitance-voltage characteristics of atomic layer deposited Al2O3 films on GaN substrates. The conduction band offset at the Al2O3/GaN interface was calculated...

AgAl2O3 nanocomposite were synthesized by solution combustion Technique using ammonium carbonate as a new fuel under simultaneous combustion of alumina and silver particles condition. Samples prepared with different amount of silver, were characterized by XRD, BET, SEM and optical Absorption measurements. XRD analysis was used to determine the change in phase and size of the synthesized n...

Two-dimensional neutronics calculations have been performed to determine the nuclear radiation environment at selected locations in the FIRE diagnostics penetrations and to assess the impact of streaming on average flux outside the port flange. The total neutron flux (integrated over all energies), the fast neutron flux (E > 0.1 MeV) and the total gamma flux were calculated at the front of the ...

Alumina (Al2O3) is a widely used material for catalysis in the chemical industry. Besides high specific surface area, acid sites on Al2O3 play crucial role transformation of adsorbed molecules, which ultimately react and desorb from catalyst. This study introduces synthetic method based electrospinning to produce nanofibers (ANFs) with acidity porosity tuned using different aluminum precursor f...

To understand the effect of different thermal conductivities on catalytic combustion characteristics, effect of thermal conductivity on micro-combustion characteristics of hydrogen-air mixtures in Pt/γ-Al2O3 catalytic micro-combustors were investigated numerically with detailed chemical kinetics mechanisms. Three kinds of wall materials (100, 7.5, and 0.5 W/m·K) were selected to investigate the...