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RISS 인기검색어
- 검색키워드
- 저자 : Masoumeh Ghalkhani (검색결과 3 건)
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Ghalkhani Masoumeh,Mirzaie Rasol Abdullah,Shahmoradi Fatemeh,Firooz Azam Anaraki 한국탄소학회 2024 Carbon Letters Vol.34 No.1
In the current research, a manganese and cobalt oxides-based nanocatalyst was developed which was used to make an efficient cathode electrode for fuel cells. The nano MnOx/MnCo2O4 was synthesized through a hydrothermal procedure followed by sintering at 500–600 °C. X-ray diffraction and scanning electron microscopy besides electrochemical techniques were applied for the characterization of the synthesized nanocatalyst. The carbon black type Vulcan (XC-72R) and PTFE were used to prepare the active reaction material of the cathode electrode named carbon paste (CP). Loading of the synthesized nano MnOx/MnCo2O4 on CP was optimized in a weight ratio of 10–90% for the oxygen reduction process in neutral conditions. The best performance was gained for the 50 W% MnOx/MnCo2O4 loaded CP, whose active surface area was twice the bare CP. The values of the exchange current density of the ORR obtained by electrode containing 50 W% MnOx/MnCo2O4 was calculated as 0.12 mA/cm2. The low price, good catalytic efficiency, and cyclic stability of the MnOx/MnCo2O4 nanocatalyst compared to the commercial platinum-based catalysts confirm its ability to develop fuel cell electrodes.
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Maryam Sabbaghan,Masoumeh Ghalkhani,Mahshid Hosseini,Maryam Ghanbari 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
ZnS nanostructures with Mn2+ doping (5%) have been prepared in ionic liquid (IL) through the refluxmethod. The undoped ZnS and Mn2+ doped ZnS (Mn.ZnS) nanostructures produced in the presence andlack of IL, were analyzed using X-ray diffraction, scanning electron microscopy, and Brunauer–Emmett–Teller methods. Then, the surface of the glassy carbon electrode (GCE) was modified by synthesized nanoZnS and Mn.ZnS and electro-activated by successive cyclic voltammetry (CV) in a NaOH solution. Thesensing ability of the modified GCEs towards isoprenaline (ISP) was examined by CV and differentialpulsed voltammetry (DPV) for which less over potentials with sharper redox currents were resultedcompared to the bare GCE. The optimized Mn.ZnS/GCE was stable in buffer solutions in the pH range of 2–8 and exhibited a linear response for ISP concentrations in the range of 0.5–30 mM with promisingsensitivity of 2.1 mA/mM and low detection limit of 90 nM. Adequate selectivity for determining ISP in thepresence of other biological compounds such as ascorbic acid, uric acid at pH 5.0 confirmed the potentialapplicability of Mn.ZnS/GCE for ISP sensing in real biological samples. Finally, an electrochemicalmechanism for the catalytic oxidation of ISP was proposed.
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Development of an electrochemical fentanyl nanosensor based on MWCNT-HA/ Cu-H3BTC nanocomposite
Maryam Akbari,Maryam Saleh Mohammadnia,Masoumeh Ghalkhani,Mohammad Aghaei,Esmail Sohouli,Mehdi Rahimi-Nasrabadi,Mohsen Arbabi,Hamid Reza Banafshe,Ali Sobhani-Nasab 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Fentanyl is a potent narcotic drug with the same effects as morphine or heroin, but it’s significantly morepotent than these drugs. That means a tiny dose can have a dangerous impact and is also lethal, so it isessential to measure it. In this work, we have developed a new electrochemical sensor to measure thisdeadly drug utilizing a nanocomposite of multi-walled carbon nanotube, hydroxyapatite, and copperbasedmetal–organic framework (MWCNT-HA/Cu-H3BTC). The nanocomposite was first examined byX-ray diffraction, field emission scanning electron, Infrared, and Raman spectroscopic techniques. Theglassy carbon electrode (GCE) modified with MWCNT-HA/Cu-H3BTC was employed to determine fentanylin aqueous solutions. The highest oxidation current was generated for fentanyl at GCE/MWCNT-HA/Cu-H3BTC compared to the GCE, GCE/MWCNT, GCE/MWCNT/HA, and GCE/Cu-H3BTC. The GCE/MWCNT-HA/Cu-H3BTC showed a linear relationship between the concentration and the oxidation current of fentanylin the 0.01 to 100 lM with a detection limit of 3 nM. Finally, the fentanyl quantification in blood serumsamples was successfully performed. The GCE/MWCNT-HA/Cu-H3BTC’s reproducibility and stability wereindeed excellent.
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