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aluminum-oxide-nanoparticle
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Modification of Surface Nanostructure and Mechanical Properties by Friction Stir Processing in Al 5083 with Al2O3 and Cu Particles
, M.Sc. Thesis Sharif University of Technology ; Kokabi, Amir Hossein (Supervisor) ; Akbarzadeh Changiz, Abbas (Supervisor)
Abstract
Al 5083 is a non-heat treatable alloy that widely used in the aerospace and automotive industry due to its low density and high strength. However, poor wearing behavior and low elastic modulus restrict its engineering applications. Metal matrix composites (MMCs) have advantages of high strength and modulus by reinforcement of second phase. Also, MMCs have excellent dimensional stability, damping capacity and wear, creep and fatigue resistances as compared with the corresponding monolithic alloys. Vast loss in ductility and toughness occurs by non- deformable ceramic reinforcements. For the surface engineering purposes, ceramic particles are added in the surface layers of components, whereas...
Fabrication and Characterization of Sn-Ag-Cu Solder Reinforced with Al2O3 Nano Particles Employing Mechanical Alloying
, M.Sc. Thesis Sharif University of Technology ; Kokabi, Amir Hossein (Supervisor) ; Simchi, Abdolreza (Supervisor)
Abstract
Many regulations have been introduced over the world to urge the elimination of lead and lead containing solders, due to increasing pressure of the environmental and health concerns associated with lead-containing solders in the electronics industry. Therefore, efforts to develop and promote lead-free soldering have recently intensified. Conventional solder technology may not guarantee the required performance at such pitches due to problems such as higher diffusivity and the softening nature of the solder. To solve these problems, efforts have been made to develop solders with a low melting point, higher strength, better microstructure properties, and high creep resistance. Recently...
Effect of Operating Conditions and Additives on the Product Yield and Sulfur Content in Thermal Cracking of a Vacuum Residue from the Abadan Refinery
, Article Energy and Fuels ; Volume 29, Issue 8 , 2015 , Pages 5452-5457 ; 08870624 (ISSN) ; Ivakpour, J ; Khorasheh, F ; Sharif University of Technology
American Chemical Society
2015
Abstract
Thermal cracking of a vacuum distillation residue of the Abadan refinery in Iran was performed under delayed coking conditions to investigate the effect of operating conditions on the yield and sulfur content of products. At reaction temperatures of 440-500 °C and pressures of 1, 3, and 5 bar, the products included gases, liquids, and coke. The yields of liquid products were higher at 1 bar compared to those for higher pressures. Increasing the reaction temperature at a given reaction pressure led to an increase in the yield of liquid products. Increasing the reaction pressure at a given reaction temperature led to higher yields of coke and gases as well as a decrease in the sulfur content...
Delafossite-alumina nanocomposite for enhanced catalytic wet peroxide oxidation of anionic pollutants
, Article Journal of Hazardous Materials ; Volume 417 , 2021 ; 03043894 (ISSN) ; Nouri, O ; Xie, Z ; Setayesh, S. R ; Wei, Z ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Mass transfer efficiency and catalytic reactivity are the two major hurdles for heterogeneous catalytic wet peroxide oxidation (CWPO) technologies. To address these issues, nanocomposite CuFeO2/Al2O3 was synthesized and assessed as a novel catalyst for enhanced adsorption and oxidation of anionic pollutants (catechol and reactive red 195 (RR195)) in waters. With a positive charge on the nanocomposite by introducing Al2O3, the adsorption of anionic pollutants was promoted. The surface complexation reaction on CuFeO2/Al2O3, which fits well to the Langmuir isotherm, has engined the mass transfer of pollutants to the nanocatalyst that demonstrated 96.46% and 99.75% removal of catechol and RR195...