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Mustafa Aghazadeh,Isa Karimzadeh,Mohammad Ghannadi-Maragheh,Mohammad Reza Ganjali 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.6
A novel electrochemical procedure was developed for the facile preparation of Gd-doped iron oxide nanoparticles (GdIO-NPs). A simple galvanostatic deposition (i=10mA cm2) was done in an additive-free aqueous solution containing FeCl2·4H2O, Fe(NO3)3·9H2O and GdCl3·6H2O. The XRD, FE-SEM, EDS and TEM characterizations showed that the product is composed of 15% GdIO-NPs with 10 nm in size. VSM analysis proved that the GdIONPs are superparamagnetic. The cyclic voltammetry and charge-discharge tests showed that the prepared GdIO-NPs are capable to deliver specific capacity as high as 190.1 F g1 at 0.5A g1 and capacity retention of 95.1% after 2000 cycling. Based on the results, it was concluded that the developed electrochemical strategy acts as an efficient procedure for the preparation of lanthanide doped MNPs with proper magnetic and supercapacitive characters.
Saeed Heidary,Saeed Setayeshi,Mohammad Ghannadi-Maragheh 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.5
The aim of this study is to compare the adaptive neuro-fuzzy inference system (ANFIS) andthe artificial neural network (ANN) to estimate the cross-talk contamination of 99mTc / 201Tlimage acquisition in the 201Tl energy window (77 ± 15% keV). GATE (Geant4 Application inEmission and Tomography) is employed due to its ability to simulate multiple radioactive sourcesconcurrently. Two kinds of phantoms, including two digital and one physical phantom, are used. Inthe real and the simulation studies, data acquisition is carried out using eight energy windows. TheANN and the ANFIS are prepared in MATLAB, and the GATE results are used as a training dataset. Three indications are evaluated and compared. The ANFIS method yields better outcomes fortwo indications (Spearman’s rank correlation coefficient and contrast) and the two phantom resultsin each category. The maximum image biasing, which is the third indication, is found to be 6%more than that for the ANN.
Novel Method for Stripping of Molybdenum(VI) after Its Extraction with Cyanex 301
Saberyan, Kamal,Maragheh, Mohammad Ghannadi,Ganjali, Mohammad Reza Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.4
Hydrofluoric acid has been used as a novel stripping agent for molybdenum(VI) after its extraction with Cyanex 301. In the extraction step, the effects of parameters such as type and initial concentration of acid, type of diluent, extractant concentration, metal concentration and temperature have been studied. In the stripping step, the effects of various stripping agents on stripping efficiency have been investigated. Hydrofluoric acid has been chosen as an effective stripping agent, and the effects of concentration of hydrofluoric acid, stripping time, volume of hydrofluoric acid and the number of stages of stripping have been studied. Molybdenum(VI) has been effectively separated from a large number of elements in binary mixtures, with a very high tolerance limit. Finally, the optimized method has been extended for the analysis of Mo(VI) in spent molybdenum catalysts.
Effect of silica nanoparticles on the phase inversion of liquid-liquid dispersions
Hossein Abolghasemi,Maliheh Raji Asadabadi,Mohammad Ghannadi Maragheh,Payman Davoodi Nasab 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
The effect of silica nanoparticles on phase inversion of liquid-liquid dispersions in a stirred vessel was investigated. The studied systems were toluene dispersed in water and vice versa. In the first set of experiments, phase inversion behavior of systems without Silica nanoparticles was evaluated and subsequent experiments were conducted in the presence of the nanoparticles. For this purpose, Silica nanoparticles of different concentrations (0.01, 0.03, 0.05,0.07 wt%) were dispersed in water. The nanofluid stability was examined using an ultraviolet-visible (UV-vis) spectrophotometer. The results indicated that increase in silica nanoparticle concentrations up to 0.07 wt% led to increase in agitation speed of phase inversion 43-53.5% and 38.5-45% in the case of O/W and W/O dispersions, respectively. Consequently, the tendency of dispersions to inversion diminished as nanoparticle concentrations increased. Finally,0.05 wt% of silica nanoparticle was selected as the optimum on the range studied.
Synergistic extraction and separation of Dysprosium and Europium by supported liquid membrane
Parisa Zaheri,Hossein Abolghasemi,Toraj Mohammadi,Mohammad Ghannadi-Maragheh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Synergistic extraction and separation of Dysprosium (Dy) and Europium (Eu) via supported liquid membrane (SLM) were investigated using mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and Bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex272). The results showed that separation of Dy and Eu was highly dependent on the pH of feed solution. Dy can be extracted more than Eu, because the equilibrium constant for Dy using the mixture of D2EHPA and Cyanex272 was greater than that for Eu. Various parameters were optimized to achieve maximum separation factor, namely feed phase pH, carrier concentration and stripping phase concentration. The membrane was stable at six cycles of operation.
Development of $^{166}Ho$-phytate Complex for Radiosynovectomy
Jalilian, Amir R.,Anvari, Akbar,Bahrami-Samani, Ali,Mazidi, Mohammad,Ghannadi-Maragheh, Mohammad The Korea Society of Nuclear Medicine 2011 핵의학 분자영상 Vol.45 No.2
Background $^{66}Ho$-chloride was obtained by bombardment of natural $Ho(NO_3){_3}$ dissolved in acidic media using thermal neutron flux ($4-5{\times}10^{13}n.cm^{-2}.s^{-1}$). Methods $^{166}Ho$-holmium chloride (185 MBq) was used successfully for preparation of $^{166}Ho$-phytate complex with high radiochemical purity (>99.9 %, ITLC, MeOH: $H_2O$: acetic acid, 4: 4: 2, as mobile phase). The complex stability and viscosity were checked in the final solution up to 2 days. The prepared complex solution ($60{\mu}Ci/100{\mu}l$) was injected intraarticularly to male rat knee joints. Leakage of radioactivity from the injection site and its distribution in organs were investigated up to 2 days. Results Approximately all of the injected dose had remained in the injection site 2 days after injection. Conclusion The complex was proved to be a feasible agent for cavital radiotherapy in oncology and rheumatology.