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RISS 인기검색어
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- 저자 : Kourosh Esfandiari (검색결과 2 건)
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CO2 and N2 adsorption and separation using aminated UiO-66 and Cu3(BTC)2: A comparative study
Kasra Pirzadeh,Kourosh Esfandiari,Ali Asghar Ghoreyshi,Mostafa Rahimnejad 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3
UiO-66 and Cu3(BTC)2, two well-known metal organic frameworks (MOFs), were aminated through insitu modification approach to improve CO2/N2 separation. UiO-66 was synthesized by solvothermal method, while Cu3(BTC)2 was synthesized with two electrochemical and solvothermal approaches for the sake of comparison. NH2- UiO-66 structure was optimized by evaluating the effect of key parameters, such as synthesis temperature, ligand to metal salt molar ratio, and modulator to metal salt molar ratio, on CO2/N2 selectivity. The effect of different weight percentage of 2-aminoterephthalic acid (NH2-BDC) on electrochemical synthesis of NH2-Cu3(BTC)2 was also investigated. Products were characterized by FTIR, BET, FESEM, XRD, and TGA analyses. Single CO2 adsorption experiment for NH2-UiO-66 showed higher capacity compared to UiO-66. However, for NH2-Cu3(BTC)2, an opposite trend was observed. The CO2 adsorption capacity for NH2-UiO-66 and NH2-Cu3(BTC)2 at 1 bar and 25 oC was 3.32 and 3.86 mmol/g, respectively. CO2/N2 selectivity with fixed concentration ratio (15/85 vol%) was also studied for aminated samples, and the values of 120 and 53 were determined for NH2-UiO-66 and NH2-Cu3(BTC)2, respectively. NH2-Cu3(BTC)2 showed the highest isosteric heat of adsorption among all samples (43 kJ/mol).
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Mahdieh Jahanbakhshi,Salman Nourouzi,Reza Naseri,Kourosh Esfandiari 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Aluminum alloys are used in numerous industrial fields due to low weight and high strength to weight ratio. Among differentforming processes, semi-solid casting is one of the most attractive methods for obtaining improved structures as well asminimizing the porosity and segregation problems of conventional casting. In this study, simultaneous employment of coolingslope and introducing mechanical vibration into the melt during solidification is investigated from viewpoint of microstructureof as-cast A356 aluminum alloy. Obtained results demonstrate that by simultaneous employment of cooling slope andmechanical vibration, more refinement can be occurred in comparison to distinct employment of these two procedures. Asa result of this research, in this experimental condition with vibration frequency of 20 Hz and time equal to 3 min, the finalaverage grain size of 50 μm and shape factor of 0.66 can be achieved. Furthermore, mechanical properties of as-cast alloyare also enhanced so that Brinell hardness number and compression strength of the optimum sample are determined equalto 74 Brinell and 486 MPa, respectively.
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