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- 저자 : Khajouei Mohammad (검색결과 3 건)
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Mohammad Khajouei‑Nezhad,Mohammad Hossein Paydar,Majid Mokarizadeh Haghighi Shirazi,Jenő Gubicza 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.12
In this study the feasibility of using high-pressure torsion (HPT) process as a suitable technique for solid-state recycling ofAl alloy machining chips has been evaluated. One and four turns of HPT were used for consolidation of 7075 Al alloy chips/commercially pure Al powder mixtures at room temperature. The prepared mixtures included different weight fraction ofchips in the range from 20 to 100%. The samples were fabricated from either annealed or non-annealed chips. Additionally,the effect of the fraction of 7075 Al chips on the density, microstructure and tensile behavior of the consolidated sampleswas investigated. It was found that the addition of pure aluminum powder played an important role as a binder in the consolidationprocess and yielded improved mechanical properties due to creating lower porosity and better bonding betweenthe chips. Tensile tests revealed that the highest ultimate tensile strength and fracture strain were obtained for the compositecontaining near 50 wt% annealed 7075 Al chips, and fabricated through 4 turns of HPT. Optical microscopy investigationsdemonstrated that these conditions resulted in a fine microstructure with uniform distribution of chips.
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Maryam Ariazadeh,Zahra Farashi,Navid Azizi,Mohammad Khajouei 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
Silica (SiO2) nanoparticles were first functionalized using (3-aminopropyl) triethoxysilane (APTES) and then utilized as filler for the preparation of poly (ether-block-amide) (Pebax®-1074) based mixed-matrix membranes (MMMs). To characterize the modified nanoparticles and the prepared membranes, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and thermal gravimetric analysis (TGA) were conducted. The influences of the pure and amine-modified nanoparticles content, and feed temperature and pressure on CO2 and CH4 permeability and ideal CO2/CH4 selectivity values of the membranes were studied. The permeation experiments exhibited that the incorporation of 12.5 wt% of amine-functionalized SiO2 nanoparticles into the Pebax matrix raises the CO2 permeability and ideal CO2/CH4 selectivity about 100 and 32%, respectively.
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Azizi Navid,Jahanmahin Omid,Homayoon Reza,Khajouei Mohammad 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
Mixed-matrix membranes (MMMs) composed of suitable CO2-philic polymers and fillers can be attractive candidates for CO2/CH4 and CO2/N2 separation due to their high CO2 permeability, good thermochemical stability, low fabrication cost, and fast production process. In this research, a novel ternary MMM was fabricated via the blending of poly (amide 12-b-ethylene oxide) (PEBAX-1074) with polyethylene glycol (PEG-200) and magnesium oxide (MgO) nanoparticles mixture. The effects of various loadings of the fillers on CO2, N2, and CH4 permeability values through the membranes were studied. Permeation of CO2, N2, and CH4 gases through the resultant membranes at pressures of 2, 4, 6, 8, and 10 bar and temperatures of 25, 35, 45, and 55 °C revealed the superiority of the MMMs for CO2/CH4 and CO2/N2 separation in comparison with the pristine membranes. Particularly, at 25 °C and 2 bar, the CO2 permeability, as well as ideal CO2/CH4 and CO2/N2 selectivity of the optimized MMM containing 40 wt% of PEG-200 and 8 wt% of MgO nanoparticles, rose to 210.1 Barrer, 24.9 and 60.9, corresponding to enhancement of around 225%, 23% and 24% of the CO2 permeability and selectivity compared to the neat membrane, respectively. Thus, the fabricated MMM has a satisfying potential to separate CO2 from N2.
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