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Mozaffar Abdollahifar,Mohammad Haghighi,Ali Akbar Babaluo 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The Ni/Al2O3–MgO nanocatalyst with Al/Mg ratio of 1.5 was prepared successfully using sonochemistry method and shown high activity and stability in dry reforming of methane. XRD, BET, FESEM, TEM and EDAX-dot mapping techniques have been used for nanocatalyst characterization. XRD analysis confirmed the formation of MgO and NiO cubic phases. According to the FESEM micrographs, nanostructure grains with uniform surface size distribution have been observed in of the synthesized nanocatalyst. The TEM micrographs showed that ultrasound-assisted preparation method induced uniform morphology without agglomeration of particles. The activity of synthesized nanocatalyst could reach thermodynamic equilibrium conversions and H2/CO ratios.
Structural properties of water around uncharged and charged carbon nanotubes
Mozaffar Ali Mehrabian,Amir Reza Ansari Dezfoli,Hassan Hashemipour Rafsanjani 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
Studying the structural properties of water molecules around the carbon nanotubes is very important in a wide variety of carbon nanotubes applications. We studied the number of hydrogen bonds, oxygen and hydrogen density distributions, and water orientation around carbon nanotubes. The water density distribution for all carbon nanotubes was observed to have the same feature. In water-carbon nanotubes interface, a high-density region of water molecules exists around carbon nanotubes. The results reveal that the water orientation around carbon nanotubes is roughly dependent on carbon nanotubes surface charge. The water molecules in close distances to carbon nanotubes were found to make an HOH plane nearly perpendicular to the water-carbon nanotubes interface for carbon nanotubes with negative surface charge. For uncharged carbon nanotubes and carbon nanotubes with positive surface charge, the HOH plane was in tangential orientation with water-carbon nanotubes interface. There was also a significant reduction in hydrogen bond of water region around carbon nanotubes as compared with hydrogen bond in bulk water. This reduction was very obvious for carbon nanotubes with positive surface charge. In addition, the calculation of dynamic properties of water molecules in water-CNT interface revealed that there is a direct relation between the number of Hbonds and selfdiffusion coefficient of water molecules.
Asadi, Mozaffar,Ghatee, Mohammad Hadi,Torabi, Susan,Mohammadi, Khosro,Moosavi, Fatemeh Korean Chemical Society 2013 대한화학회지 Vol.57 No.1
Some vanadyl complexes were synthesized by treating a methanolic solution of the appropriate Schiff base ligand and one equivalent of $VO(SO_4)_2$ to yield [($VOL_2^{1-14}$)](L=Salicylaldehyde's derivatives, Schemes 1, 2). These oxovanadium (IV) complexes were characterized based on their FT-IR, UV-Vis spectroscopy and elemental analysis. The IR spectra suggest that coordination takes place through azomethine nitrogen and phenolate oxygen. In addition, the formation constants of the oxovanadium (IV) binary complexes were determined in methanolic medium. The ab initio calculations were also carried out to determine the structural and the geometrical properties of one of the complexes and its calculated vibrational frequencies were investigated.
Afsharfard, Aboulfazl,Mozaffar, Mohammad,Orang, Elahe,Tahmasbpour, Eisa Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Background: Breast cancer (BC) is the top cancer among women worldwide and the most frequent malignancy among Iranian women over the past few decades. The increasing trend and high mortality rate of BC in the developing world necessitates studies concentrating on its characteristics in countries in Asia. The current study focused on clinical and histopathological features of BC among Iranian females. Materials and Methods: This retrospective study involved 714 Iranian patients with histopathologically proven BC undergoing resection of primary tumours and axillary clearance. Demographic, clinical and histopathological data were obtained and studied between ten year age groups (${\leq}40$ years, 41-50 years, 51-60 years, 61-70 years, and ${\leq}71$ years) in four chronologic phases from 1994-2009. Results: Mean age of patients was $49.4{\pm}13.1$ years. Most of cases (33.2%) were in 41-50 group. Mean size of primary tumors was $3.94{\pm}2.47$ cm and 87.1% of cases had infiltrative ductal carcinoma. Modified radical mastectomy was the most common method of surgery carried out (48.8%). Some 57.1% of tumors were in pT2 and tumor size decreased significantly during the period (p<0.05). The most common BC stage was llla (27%). Lower BC stages (0 and 1) constituted 13.9% of the diagnosed tumors. Our series of patients aged ${\leq}40$ had larger tumors (mean $4.73{\pm}3.02$ cm) compared to older age groups (p=0.003). Lower stages (0 and I) were more frequent among the oldest patients while nearly 50% of patients aged ${\leq}40$ had tumor stage III. We also observed a significant decreasing trend in the mean LN count (p<0.05) and blood vessel invasion (p=0.023) from younger to older age groups. Conclusions: More aggressive disease for younger age groups, earlier peak incidence age and high rate of advanced BC at the time of diagnosis among Iranian women, were the main findings of this study.
Zahra Asadi,Mozaffar Asadi,Fahimeh Dehghani Firuzabadi,Mohammad Ranjkesh Shorkaei 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
This study presents a new method in synthesis of nano uranyl Schiff base complexes. In thismethod slowaddition of dilute uranyl(VI) acetate solution to dilute Schiff base solution following the reflux for about24 h, yields nano uranyl(VI) Schiff base complexes. Characterization of Schiff base ligands and nanouranyl complexes has been done using 1H NMR, IR, UV–vis spectroscopy, elemental analysis. Schiff baseligands were synthesized by the condensation of one mole 3,4-diaminobenzophenone and two molessalicylaldehyde or substituted salicylaldehyde (3-OMe, 4-OMe, 5-OMe, 5-Br, 5-Cl). The electrochemicalproperties of the uranyl(IV) complexes were investigated by cyclic voltammetry. A good correlation wasobserved between the oxidation potentials and the electron withdrawing character of the substituentson the Schiff base ligands, according to the following trend: 5-MeO < H < 5-Br 5-Cl. Also the effect ofthe position of the substituted groups of Schiff base on the anodic potentials is as follows: 5-OMe < 3-OMe < 4-OMe.
Zeynab Seyfouri,Mehran Ameri,Mozaffar Ali Mehrabian 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.2
In the present study, a totally heat-driven refrigeration system is proposed and thermodynamically analyzed. This system uses a low-temperature heat source such as geothermal energy or solar energy to produce cooling at freezing temperatures. The proposed system comprises a Rankine cycle (RC) and a hybrid GAX (HGAX) refrigeration cycle, in which the RC provides the power requirement of the HGAX cycle. An ammonia–water mixture is used in both RC and HGAX cycles as the working fluid. A comparative study is conducted in which the proposed system is compared with two other systems using GAX cycle and/or a single stage cycle, as the refrigeration cycle. The study shows that the proposed system is preferred to produce cooling at temperatures from 2∘C to −50∘C. A detailed parametric analysis of the proposed system is carried out. The results of the analysis show that the system can produce cooling at −50 ∘ C using a low-temperature heat source at 133.5∘C with the exergy efficiency of about 20% without any input power. By increasing the heat source temperature to 160∘C, an exergy efficiency of 25% can be achieved.
Influence of γ-Al2O3 nano particles on the properties of washcoats deposited on cordierite monoliths
Shahram G. Pakdehi,Mozaffar Salimi,Maryam Rasoolzadeh,Mojtaba Abbasi 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.5
The main aspects of washcoating of ceramic monolith by nano γ-Al2O3 slurry were studied. Some of the deposition characteristics of the washcoat such as morphology and homogeneity, specific load, thickness of the layer and adherence were examined. SEM was applied to assess the quality of the washcoat layer and measure its thickness. The adhesion of nano γ- Al2O3 washcoat on cordierite monolith was investigated by a vibrational ultrasonic and thermal shock tests. Nano γ-Al2O3 washcoat forms a good homogeneous layer on the monolith in comparison with the common micron size γ-Al2O3 particles, but some cracks appeared on washcoated layer.
Shahram G. Pakdehi,Abdolhamid Asadi,Mozaffar Salimi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Ni/γ-Al2O3 nanocatalyst was synthesized by incipient wetness impregnation method for using in the catalytic decomposition ofhydrazine. To stabilize the catalyst, γ-Al2O3 support was precalcined which resulting 8% reduction in specific surface area. Thecatalyst was characterized by XRD, BET and TEM. The results showed that increasing the number of impregnation steps ledto a reduction in size of nickel particles. In addition, the number of impregnation steps had a direct effect on strength ofcatalyst and could reduce the catalyst loss. TPR analysis showed that Ni/γ-Al2O3 nanocatalyst was reduced at about 700 oC.