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Synergetic effect of MWCNT/nanoclays on microcellular polystyrene hybrid nanocomposite foams
Hasanzadeh Rezgar,Darvishi Mohammad Mehdi,Azdast Taher 한국탄소학회 2020 Carbon Letters Vol.30 No.4
Synergetic efect of multi-walled carbon nanotubes (MWCNTs)/nanoclays hybrid was investigated on the properties of high�impact polystyrene (HIPS) nanocomposite foams. The glass transition temperature and the cellular structure including the cell size and cell density were studied in details. Adding MWCNT and nanoclay increased the glass transition temperature of HIPS by 8.5 °C and 1.5 °C, respectively. The experimental results indicated that the cell size of HIPS foams was reduced from 84.05 to 60.97 µm and 40.22 µm using MWCNTs and nanoclays, respectively. The synergetic efect of MWCNT/nanoclay was more signifcant by reducing the cell size to 13.69 µm. The cell density was improved from 5.79×104 to 1.77×105 cell/ cm3 using MWCNTs and to 9.39×106 cell/cm3 using nanoclays. The cell density reached to 2.90×107 cell/cm3 using the synergetic efect of MWCNT/nanoclay.
Hasanzadeh, Aliyeh,Khataee, Alireza,Zarei, Mahmoud,Joo, Sang Woo Elsevier 2018 CHEMOSPHERE - Vol.199 No.-
<P><B>Abstract</B></P> <P>This work reports the potential application of modified gas-diffusion electrode (GDE) with C<SUB>60</SUB>-CNT composite, as a stable and efficient cathode material for degradation of trifluralin (TRL) pesticide by photo-assisted electrochemical (PE) process. C<SUB>60</SUB>-CNT composite was prepared and characterized. Subsequently, a novel C<SUB>60</SUB>-CNT composite modified GDE cathode was developed and the electrochemical and physical characteristics of the modified GDEs were studied. C<SUB>60</SUB>-CNT composite/GDE showed great efficiencies for electro-generating H<SUB>2</SUB>O<SUB>2</SUB>, owing to huge surface area and high conductivity. Afterwards, a comparative study of TRL oxidation via photolysis, anodic oxidation (AO) and PE processes using C<SUB>60</SUB>-CNT composite/GDE revealed the degradation percentages of 42.2, 48.5 and 93.4%, respectively, after 180 min of treatment. The TRL degradation followed a pseudo-first-order kinetics, being faster in the order: photolysis < AO < PE. The effects of various operational conditions were assessed on the degradation of TRL. From the results, PE process using C<SUB>60</SUB>-CNT composite/GDE exhibited great performance for the degradation of TRL (20 mg L<SUP>−1</SUP>) under its original pH, Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte concentration of 0.05 mol L<SUP>−1</SUP>, applied current intensity of 300 mA, and flow rate of 12.5 L h<SUP>−1</SUP>. TOC results displayed that 92.8% of TRL was mineralized after 8 h of PE process. In addition, a plausible pathway for mineralization of TRL was proposed according to the identified by-products detected by means of gas chromatography–mass spectroscopy (GC–MS), High-performance liquid chromatography (HPLC) and ion chromatography analyses.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of C<SUB>60</SUB>-CNTs hybrid with covalently attached C<SUB>60</SUB> onto outer surface of CNTs. </LI> <LI> Modification of gas-diffusion electrode with C<SUB>60</SUB>-CNTs hybrid for H<SUB>2</SUB>O<SUB>2</SUB> electro-generation. </LI> <LI> Achievement of the highest value of H<SUB>2</SUB>O<SUB>2</SUB> electro-generation by C<SUB>60</SUB>-CNTs hybrid/GDE. </LI> <LI> High degradation efficiency of trifluralin using C<SUB>60</SUB>-CNTs hybrid/GDE in PE process. </LI> <LI> Offer the degradation pathway of trifluralin by photoassisted electrochemical process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Analysis and Optimization of Permanent Magnet Dimensions in Electrodynamic Suspension Systems
Hasanzadeh, Saeed,Rezaei, Hossein,Qiyassi, Ehsan The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
In this paper, analytical modeling of lift and drag forces in permanent magnet electrodynamic suspension systems (PM EDSs) are presented. After studying the impacts of PM dimensions on the permanent magnetic field and developed lift force, it is indicated that there is an optimum PM length in a specified thickness for a maximum lift force. Therefore, the optimum PM length for achieving maximum lift force is obtained. Afterward, an objective design optimization is proposed to increase the lift force and to decrease the material cost of the system by using Genetic Algorithm. The results confirm that the required values of the lift force can be achieved; while, reducing the system material cost. Finite Element Analysis (FEA) and experimental tests are carried out to evaluate the effectiveness of the PM EDS system model and the proposed optimization method. Finally, a number of design guidelines are extracted.
Hasanzadeh, Mohammad.,Shadjou, Nasrin.,Saghatforoush, Lotfali.,Khalilzadeh, Balal.,Kazeman, Isa. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Copper-dimethylglyoxime complex (CuDMG) modified Copper electrode (Cu/CuDMG) showed a catalytic activity towards cyclohexanol oxidation in NaOH solution. The modified electrode prepared by the dimethylglyoxime anodic deposition on Cu electrode in the solution contained 0.20 M $NH_4Cl\;+\;NH_4OH\;(pH\;9.50)\;and\;1\;{\times}\;10^{-4}$ M dimethylglyoxime. The modified electrode conditioned by potential recycling in a potential range of -900${\sim}$900 mV vs. Ag/AgCl by cyclic voltammetry in alkaline medium (1 M NaOH). The results show that the CuDMG film on the electrode behaves as an efficient catalyst for the electro-oxidation of cyclohexanol in alkaline medium via Cu (III) species formed on the electrode.
Performance Analysis of Contactless Electrical Power Transfer for Maglev
S. Hasanzadeh,S. Vaez-Zadeh 한국자기학회 2012 Journal of Magnetics Vol.17 No.2
Contactless electrical power transfer through an air gap is a revived technology for supplying energy to many movable applications including Maglev. In this paper, magnetic equivalent circuits and analytical models of contactless electrical power transfer systems are developed and evaluated through experiment. Overall coupling coefficient and overall efficiency are introduced as means for evaluating the systems’ performance. Compensating capacitors in primary and secondary sides of the systems improve the overall coupling coefficient and overall efficiency. Using the analytical models, the effects of different parameters and variables such as air gap and load current are analyzed to give a high coupling coefficient and an improved efficiency of power transfer for different compensation structures.
Mohammad. Hasanzadeh,Nasrin. Shadjou,Lotfali. saghatforoush,Balal. Khalilzadeh,Isa. Kazeman 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Copper-dimethylglyoxime complex (CuDMG) modified Copper electrode (Cu/CuDMG) showed a catalytic activity towards cyclohexanol oxidation in NaOH solution. The modified electrode prepared by the dimethylglyoxime anodic deposition on Cu electrode in the solution contained 0.20 M NH4Cl + NH4OH (pH 9.50) and 1 × 10-4 M dimethylglyoxime. The modified electrode conditioned by potential recycling in a potential range of ‒900 ~ 900 mV vs. Ag/AgCl by cyclic voltammetry in alkaline medium (1 M NaOH). The results show that the CuDMG film on the electrode behaves as an efficient catalyst for the electro-oxidation of cyclohexanol in alkaline medium via Cu (III) species formed on the electrode.
Mahdi Hasanzadeh,Abdolreza Simchi,Hossein Shahriyari Far 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Activated carbon (AC) is an inert adsorbent material that has widely been used in water treatment orremoving of environmental pollutants from water. In order to improve the adsorption of AC, which highlydepends on its pore size and surface area, we prepared highly porous adsorbent composites of activatedcarbon (AC)/chromium-based MOF (MIL-101(Cr)). The composite has a high specific surface area of2440 m2 g 1 and total pore volume of 1.27 cm3 g 1. To show the efficiency of the composite as anadsorbent, the removal kinetics of anionic dyes (Direct Red 31 and Acid Blue 92) from aqueous solutionsdependent on the amount of composite, adsorption time, concentration of dye and pH is demonstrated. Itis shown that the kinetics of organic dye removal by AC@MIL-101(Cr) composite is faster than MIL-101(Cr) under near neutral pH conditions. The half-time of removal is about 3 min while about 85% of the dyeis removed after 5 min. This study provides new idea into the design and synthesis of highly efficientnanoporous adsorbent based on MOFs for removal of pollutants as well as organic dyes from wastewater.
Analysis and Optimization of Permanent Magnet Dimensions in Electrodynamic Suspension Systems
Saeed Hasanzadeh,Hossein Rezaei,Ehsan Qiyassi 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
In this paper, analytical modeling of lift and drag forces in permanent magnet electrodynamic suspension systems (PM EDSs) are presented. After studying the impacts of PM dimensions on the permanent magnetic field and developed lift force, it is indicated that there is an optimum PM length in a specified thickness for a maximum lift force. Therefore, the optimum PM length for achieving maximum lift force is obtained. Afterward, an objective design optimization is proposed to increase the lift force and to decrease the material cost of the system by using Genetic Algorithm. The results confirm that the required values of the lift force can be achieved; while, reducing the system material cost. Finite Element Analysis (FEA) and experimental tests are carried out to evaluate the effectiveness of the PM EDS system model and the proposed optimization method. Finally, a number of design guidelines are extracted.