List of subject articles

In this paper, we synthesized the Ag and Cu nanorods and investigated the thermal conductivity behavior of nanofluids containing of them. The samples have been characterized by Xray diffraction (XRD) and transmission electron microscopy (TEM). XRD results revealed that More

In this paper, we synthesized the Ag and Cu nanorods and investigated the thermal conductivity behavior of nanofluids containing of them. The samples have been characterized by Xray diffraction (XRD) and transmission electron microscopy (TEM). XRD results revealed that the crystalline structure of Ag and Cu nanorods with cubic structure were formed. TEM image showed that the synthesis of Ag and Cu leads to the rod structures. The experimental results of termal conductivity showed that by increasing the temperature in the range of from 20 to 60°C and weight fraction from 0.25 to 0 %wt, thermal conductivity of all nanofluids increased. Meanwhile, it can be observed that the minimum and maximum thermal conductivity of Ag nanofluid were 0.56 W/m.K and 2.93 W/m.K respectively, and in the Cu nanofluid were 0.33 W/m.K and 2.74 W/m.K. The results of thermal conductivity behavior of nanofluids revealed that the thermal conductivity of all nanofluids, increases with temperature and weight fraction. However the influence of temperature is more significant than that of weight fraction. Manuscript profile

Open Access Article

6 - Copper manganese ferrite nanoparticles production via co precipitation method and study of its sensitivity property for ethanol detection
Hamid Reza Ebrahimi Majid Mozaffari Hasan Ghafuri Varzaneh Syed Alireza Sorori

20.1001.1.24233226.1396.11.4.4.2

A copper manganese ferrite nanoparticles from effective ferrites that applicable in sensitivity investigations was prepared in this study. Co-precipitation method was used for synthesis of this ferrite that is useful method for synthesizing of these compounds. For struc More

A copper manganese ferrite nanoparticles from effective ferrites that applicable in sensitivity investigations was prepared in this study. Co-precipitation method was used for synthesis of this ferrite that is useful method for synthesizing of these compounds. For structure evaluation, X-ray diffraction (XRD) experiments for phase formation confidence and transmission electron microscopy (TEM) for formation of nanoparticles below 30 nm scale confidence were used. By X-ray fluorescence (XRF) experiment exact percent of each element was determined in copper manganese ferrite compound. By (AGFM) experiments the magnetic behavior of powder and disk sample of copper manganese ferrite nanoparticles was determined. For sensitivity properties investigation of these nanoparticles, mentioned nanoparticles were converted to a tablet form. This tablet was putted in a temperature controlled box. Nine solvents were vaporized (gases) and exposed to this nanoparticles. Responses to these gases were transmitted to a computer by an electronic board connection. Result information was analyzed by software. Sensitivity study of this nano sensor was tested by using carbon tetrachloride, ethanol, methanol, acetonitrile, acetone, vinyl acetate, acrylonitrile, ammonia and formamide. Among these gases ethanol had the best sensitivity in 100˚C temperature. Manuscript profile

Open Access Article

7 - Investigation of influences of mechanical activation and heating rate on nanostructured NiAl-Al2O3 composites formation by combustion synthesis
Maryam Beyhaghi

20.1001.1.24233226.1396.11.2.1.5

Investigation of influences of mechanical activation and heating rate on nanostructured NiAl-Al2O3 composites formation by combustion synthesis Abstract The paper investigates influence of mechanical activation and heating rate (20°C/min and 40°C/min) on react More

Investigation of influences of mechanical activation and heating rate on nanostructured NiAl-Al2O3 composites formation by combustion synthesis Abstract The paper investigates influence of mechanical activation and heating rate (20°C/min and 40°C/min) on reactions occurrence in combustion synthesis process of nanostructured NiAl-Al2O3 composites by heating of Ni, NiO and Al powder mixture from 20°C to 1300°C. To study reactions occurrence, differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized. By heating the sample without mechanical activation, exothermic reaction of NiO reduction by Al and Ni-Al intermetallic phases production happened in the presence of molten Al; while mechanical activation caused occurrence of these reactions at lower temperatures and separately. By decrement in heating rate, reactions happened separately at lower temperatures. A mechanism for reactions occurrence during heating of mechanically activated sample is proposed. Keywords Composite, Nanostructured Materials, Combustion Synthesis, NiAl, Al2O3, Mechanical Activation, Mechanical Milling, Heating Rate Manuscript profile

Open Access Article

8 - Synthesis and characterization of ZrB2 nanopowder by Sol-gel method
Abolhassan Najafi Gholamreza Khalaj Milad Rahmani-Azad

20.1001.1.24233226.1401.16.4.4.7

In the present study, ZrB2 nano powders were synthesized using sol-gel method. Zirconium alkoxide was used as the source of zirconium and boric acid as the source of boron. The size of precursor nanoparticle was controlled using the pH parameter inside the sol, and the More

In the present study, ZrB2 nano powders were synthesized using sol-gel method. Zirconium alkoxide was used as the source of zirconium and boric acid as the source of boron. The size of precursor nanoparticle was controlled using the pH parameter inside the sol, and the formation of primary nuclei of ZrB2 phase and their crystallized amount were investigated using the temperature parameter. To evaluate the mechanism of product formation during the sol-gel process, DLS analysis showed that the size of precursor particle inside the sol at pH less than 5 was below 10 nm. Mixing of precursor particles at molecular level inside the sol was one of the important reasons in reducing the synthesis temperature of ZrB2 particles. FTIR analysis on chemical bonds showed that Zr-O-B bond was formed inside the gel powder.DTA analysis showed that the primary nuclei of ZrB2 particles were formed at a temperature of about 1400 °C. XRD observations proved that the primary nuclei of the ZrB2 phase crystallized and grew at a temperature of about 1500°C. Surface research revealed that the specific surface area of the synthesized ZrB2 particles is equivalent to 115 m2/g, and also the surfaces of these particles are porous, and the size of these porosities is in meso range. SEM analysis showed that the particle size of ZrB2 having homogeneous morphology is about 50 nm. TEM microstructural analysis revealed that ZrB2 particles were formed uniformly and orderly in very fine dimensions. Manuscript profile

Open Access Article

9 - Synthesis of Mg0.5Zn0.5Fe2O4 nanoparticles via co-precipitation method and study of its sensitivity properties
حمیدرضا ابراهیمی علی رضا امینی

20.1001.1.24233226.1395.10.4.12.3

In this study, synthesis and studying sensitivity of Nano sensor of zinc magnesium ferrite with common formula of Mg0.5Zn0.5Fe2O4 has been considered. Applied method for manufacturing Nano sensor is co-precipitation method that is a novel method for this combination. Na More

In this study, synthesis and studying sensitivity of Nano sensor of zinc magnesium ferrite with common formula of Mg0.5Zn0.5Fe2O4 has been considered. Applied method for manufacturing Nano sensor is co-precipitation method that is a novel method for this combination. Nano sensor structure was investigated using such experiments as X-ray diffraction (XRD(, transmission electron microscopy (TEM) and X-ray fluorescence (XRF). Respectively, XRD experiment confirmed the formation of ferrite phase, TEM image showed nanostructure formation of this ferrite and XRF information reconfirmed correct atomic relation of ferrite. Sensitivity of this Nano sensor was tested using a laboratory system equipped with sensor heater with the ability of temperature control on which Nano-sensor was put, a chamber for injecting various solvents and a connector electronic range that transferred Nano-sensor information to computer and it was analyzed by Lab View software. This system could control temperature and wetness and its volume was 5 litters. This Nano sensor was tested using ethanol, methanol, chloroform, acetonitrile, ammonia and acetone and sensitivity of methanol and acetonitrile was better than others. The best response temperature for this Nano sensor (between 100˚C -300˚C) was 300˚C. Manuscript profile

Open Access Article

10 - Effect of pH on the adsorption properties of zinc oxide-cadmium oxide nanoparticles for removal of methyl blue and methyl orange
Elahe Khalilifard Seye Ali Hasanzadeh Mojtaba Nasr Esfahani

20.1001.1.24233226.1396.11.1.4.6

ZnO-CdO nanocomposite was synthesized by a W/O microemulsion method. Effect of calcination temperature on phase transformations, crystal size and specific surface area of ZnO-CdO nanocomposite were investigated. The synthesized Products were studied by the X-ray diffrac More

ZnO-CdO nanocomposite was synthesized by a W/O microemulsion method. Effect of calcination temperature on phase transformations, crystal size and specific surface area of ZnO-CdO nanocomposite were investigated. The synthesized Products were studied by the X-ray diffraction results (XRD), thermogravimetric and differential thermal analysis (DTA-TG), Brunauer–Emmett–Teller surface area measurement (BET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Effect of pH on the removal of methyl blue and acid methyl orange was studied. XRD results showed that ZnO-CdO nanocomposites with crystallite size in nanometer scale were formed. Zinc oxide-cadmium oxide particles synthesized at 400 ˚C had the highest adsorption properties. The results showed that the adsorption of methyl blue and methyl orange on the surface of ZnO-CdO nanoparticles was higher at acidic conditions. Manuscript profile

Open Access Article

11 - Fabrication of Al2O3/SiC Nanoparticles from the Rice Hush Ash via Self-Propagation High-Temperature Synthesis and Ball Milling
قاسم دینی Morteza Hoseini

20.1001.1.24233226.1397.12.2.2.3

In this study, silica obtained from the rice hush was used to synthesis of Al2O3/SiC nanoparticles. The rice husk is an agricultural residue abundantly available in rice producing countries such as Iran. For this reason, the ash obtained from the burning of the rice hus More

In this study, silica obtained from the rice hush was used to synthesis of Al2O3/SiC nanoparticles. The rice husk is an agricultural residue abundantly available in rice producing countries such as Iran. For this reason, the ash obtained from the burning of the rice hush which contains more than 93% silica, and aluminum and carbon powders with the molar ratios of 3:4:6 were mixed and then pressed into pellets by using a cylindrical die under a pressure 50MPa. In order to conduct the Self-Propagation High-Temperature Synthesis (SHS), the produced pellets were placed in an electrical furnace at 850oC under the argon gas atmosphere. Then, a planetary ball-milling for 4, 8, 12, 16 and 24h was used to decrease the particle size of the synthesized composite. The results of XRF, XRD, SEM and DLS investigations shown that the rice hush ash can be used to fabricate Al2O3/SiC nanoparticles via SHS and ball-milling and the size of synthesized particles after ball milling for 4-24h is in the range of 870-65nm. Manuscript profile

Open Access Article

12 - Synthesis and characterization of Fe2O3/BaFe12O19 nanorods and investigation of their magnetic properties
محمد جزیره پور هرمزی محمد حسین شمس

20.1001.1.24233226.1396.11.1.11.3

In this paper Fe2O3/BaFe12O19 nanorods were synthesized by a simple low-cost hydrothermal process with large scale production capability. Morphologic characteristics of nanorods such as length, diameter and aspect ratio were controllable. EDTA was used in the synthesis More

In this paper Fe2O3/BaFe12O19 nanorods were synthesized by a simple low-cost hydrothermal process with large scale production capability. Morphologic characteristics of nanorods such as length, diameter and aspect ratio were controllable. EDTA was used in the synthesis process as the growth control agent. In this investigation the effects of different parameters such as temperature (115, 150 and 180 °C), time (5, 10, 40 h), growth controlling agent (EDTA, PEG400, PEG6000, CA) and basic agent (NaOH and NH3) were also studied. In different conditions different morphologies like spheres with a diameter of 50-100 nm and nanorods with diameters of 50-400 nm and lengths of 1-10 μm were synthesized. Morphological characteristics of the samples were studied by scanning electron microscope (SEM) and magnetic properties were measured by alternative gradient force magnetometer (AGFM). The nanorods of this research could be used for heavy metal ions removal from waste water, catalysts, solar cells and microwave absorbing materials. Manuscript profile

Open Access Article

13 - Synthesis and characterization of (Fe,Ti)3Al-Al2O3 nanocomposite via Fe2O3 reduction by Al
M. Rafiei M.H. Enayati F. Karimzadeh

20.1001.1.24233226.1396.11.2.6.0

In this research the (Fe,Ti)3Al-Al2O3 nanocomposite was synthesized via the reduction of Fe2O3 by Al during mechanical alloying (MA). For this purpose the Al, Ti and Fe2O3 powders were mixed with molar ratio of 3:1:1in a planetary ball mill. The structural and morpholog More

In this research the (Fe,Ti)3Al-Al2O3 nanocomposite was synthesized via the reduction of Fe2O3 by Al during mechanical alloying (MA). For this purpose the Al, Ti and Fe2O3 powders were mixed with molar ratio of 3:1:1in a planetary ball mill. The structural and morphology of powder particles during different milling times were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). In order to study the thermal behavior of powder particles, Heat treatment and differential thermal analysis (DTA) were done. It was found that, the reaction of nanocomposite formation is occurred in two stages during MA. The first and second reactions were reduction of Fe2O3 by Al and (Fe,Ti)3Al formation, respectively. The crystallite size and internal strain of powder particles for Al2O3 phase after 100 h of MA, were 20 nm and 3%, respectively. Also ball milling for long time led to the reduction of Fe2O3 by Al before Al melting during DTA. Manuscript profile

Open Access Article

14 - Production of porous TiC preform by the gel casting process in order to synthesize Ti3SiC2 MAX phase via infiltration of preform
حمزه فراتی راد hamidreza baharvandi mohamad maraghe

20.1001.1.24233226.1396.11.3.3.9

The ternary compound Ti3SiC2 is a representative of materials that exhibit both metals and ceramics characteristics. Similar to metals, this compound is electrical and thermal conductive material, not susceptible to thermal shock and shows plastic properties at high tem More

The ternary compound Ti3SiC2 is a representative of materials that exhibit both metals and ceramics characteristics. Similar to metals, this compound is electrical and thermal conductive material, not susceptible to thermal shock and shows plastic properties at high temperature. When considering as a ceramic, it is elastically rigid, lightweight, creep and fatigue resistant and maintains their strengths to high temperatures. In this paper, T3SiC2 bulks have been synthesized by infiltrating Si liquid into porous TiC preforms. High-purity TiC and Si powders with molar ratios of 3TiC:(1 + x)Si (where x = 0.30, 0.50, 1.00) were used as starting powders. Silicon pellets were placed at the top of the precursor pellets as a liquid source. The phase formation and microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) system. The results demonstrated that the 50 percent extra silicon results to formation of Ti3SiC2 with 92 wt.% purity. The conditions are favorable for the formation of the SiC secondary phase with increasing the amount of extra silicon to 100 percent. Also, an increase in the amount of extra silicon leads to the formation of Ti3SiC2 with the columnar morphology. Manuscript profile

Open Access Article

15 - Fabrication and investigation of structural and electromagnetic wave absorption properties of Barium Strontium Titanate/Cobalt Zinc Ferrite composites
احمد پوربافرانی

20.1001.1.24233226.1396.11.4.3.1

In this study, barium strontium titanate/cobalt zinc ferrite composites that composed of two different magnetic phases were investigated. Pyroelectric phase consists of barium strontium titanate particles with particle size of about 150 nm and soft magnetic phase consis More

In this study, barium strontium titanate/cobalt zinc ferrite composites that composed of two different magnetic phases were investigated. Pyroelectric phase consists of barium strontium titanate particles with particle size of about 150 nm and soft magnetic phase consists of cobalt zinc ferrite nanoparticles with particle size of about 30 nm. Two phases were prepared with sol-gel method and under appropriate stoichiometry. XRD analyses indicated formation of pure phase for each magnetic phases and FESEM analysis indicate the structural properties of Cobalt-Zinc ferrite and Barium Strontium Titanate nanoparticles. Investigation of permittivity, permeability and reflection loss of samples indicated the response of electromagnetic waves to these samples in the frequency range of 1-18 GHz. According to the reflection loss of composites, there are two mechanisms for the absorption of electromagnetic waves. In the first region of this frequency band, magnetic loss from Cobalt-Zinc ferrite nanoparticles is dominate and in the last region of this frequency band, dielectric loss from barium strontium titanate is dominate. Manuscript profile

Open Access Article

16 - The effect of temperature and time of calcination on synthesis of YAG nano-crystalline by normal co-precipitation method
امید میرزایی mahsa rahmani mohammad tajally

20.1001.1.24233226.1396.11.4.7.5

Nano-crystalline Yttrium aluminum garnet (YAG, Y3Al5O12) were synthesized by normal co-precipitation method using yttria and aluminum nitrates as the starting materials and ammonium hydrogen carbonate (AHC, NH4HCO3) as precipitant. To investigate the effect of temperatu More

Nano-crystalline Yttrium aluminum garnet (YAG, Y3Al5O12) were synthesized by normal co-precipitation method using yttria and aluminum nitrates as the starting materials and ammonium hydrogen carbonate (AHC, NH4HCO3) as precipitant. To investigate the effect of temperature and holding time the resultant precursors were calcined at 900-1100 °C for 2 h also at 1100 °C for other durations (15, 30, 45 and 60 min). The evolution of phase composition and micro-structure of the as-synthesized YAG powders were characterized by different techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermal analyses (TG/DTA), Speciﬁc surface area analyses (BET) and field emission electron microscopy (FESEM). The cubic YAG phase with an average grain size of 33 nm and speciﬁc surface area of 30 m2/g was completely formed at 1000 °C. In addition, pure YAG nano powders were obtained at 1100 °C in only 15 min calcination. Results showed that compared with increasing holding time, raising of temperature have more intense effect in increasing YAG crystal or particle size. Manuscript profile

Open Access Article

17 - An investigation on the behavior of manganese cobaltite spinel oxide as the SOFC interconnect coating materials
Pooria Lesani Alireza Babaei Abolghasem Ataie

20.1001.1.24233226.1396.11.4.9.7

In this study, Manganese cobaltite (MnCo2O4) spinel powders were synthesized by co-precipitation method. X ray diffraction (XRD) patterns show that the spinel phase was formed at around 350°C. Formation of spinel phase was further completed by increasing temperature More

In this study, Manganese cobaltite (MnCo2O4) spinel powders were synthesized by co-precipitation method. X ray diffraction (XRD) patterns show that the spinel phase was formed at around 350°C. Formation of spinel phase was further completed by increasing temperature up to 1000°C. Additionally, XRD patterns prove that MnCo2O4 spinel material has been stable in this temperature range. Field emission scanning electron microscope observations show that plate like particles with an average diameter of 148 and thickness of 18 nm was converted to equiaxed particles with an average particle size of 1.5 µm by increasing calcination temperature from 350 to 1000°C. Investigation of the coating of uncalcined and calcined powder on AISI 430 ferritic stainless steel shows that a proper dense coating is developed on the stainless steel surface by using uncalcined precursor powders. And also, this coating performs well by prohibiting of outward diffusion of Fe from the substrate. In this way, a low thickness chromia layer (Cr2O3) is formed between the coating and the substrate. EDX analysis shows that a mixed spinel zone is formed in the interface of the coating and the substrate due to diffusion of some elements such as Mn, Cr, and Fe from substrate to the coating, as well as Mn and Co from coating to the substrate. Manuscript profile

Open Access Article

18 - Determination of optimum production condition and characterization of Potassium Ferrate particles synthesized by electrochemical method
Sina Samimi Sede احسان صائب نوری seyed Ali Hasanzadeh Tabrizi

20.1001.1.24233226.1397.12.1.11.0

Production efficiency and energy consumption are two important factors in electrochemical synthesis of potassium ferrate particles. In this research, the effects of different parameters including applied current density, KOH electrolyte concentration and its temperature More

Production efficiency and energy consumption are two important factors in electrochemical synthesis of potassium ferrate particles. In this research, the effects of different parameters including applied current density, KOH electrolyte concentration and its temperature on production efficiency and energy consumption have been studied. The condition of optimized production has achieved in current density of 40 mA.cm-2, 13M KOH electrolyte with temperature of 70 oC for two hours. In this situation, the production efficiency was 84.63% and the energy consumption was 5.05 kwh/kg. In next step, the effect of time duration on production efficiency, purity, formed phases and the size of potassium ferrate particles has been investigated in optimal condition. The results showed that due to decomposition of potassium ferrate particles with time, iron hydroxides and oxides components have been formed which reduces the purity and production efficiency. The sizes of potassium ferrate particles were measured by two method of Debye-Scherrer and modified Debye-Scherrer. This revealed that the size of potassium ferrate particles increases as time passes. Manuscript profile

Open Access Article

19 - Synthesis and study of the highly effective catalytic activity of the Pt-LaFeO3 nanoparticles supported on polyaniline-chitosan for methanol electro-oxidation
Somaye Khammarnia Jilla Saffari Mehri-Saddat Ekrami-Kakhki Alireza Akbari

20.1001.1.24233226.1398.13.4.4.6

In this study, polyaniline (PA) accompanied by chitosan (CH) were used as effective and proper support for nanoparticles. LaFeO3 (LFO) nanoparticles were synthesized by sol-gel method and characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy More

In this study, polyaniline (PA) accompanied by chitosan (CH) were used as effective and proper support for nanoparticles. LaFeO3 (LFO) nanoparticles were synthesized by sol-gel method and characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) techniques. Pt-LFO/PA-CH nanocatalyst was prepared by chemical reduction of H2PtCl6 by NaBH4 on PA-CH support in the presence of LFO nanoparticles. The morphology and distribution of nanoparticles were determined by transmission electron microscopy (TEM) images. The catalytic activity of Pt-LFO/PA-CH nanocatalyst for methanol electro-oxidation was studied through cyclic voltammetry and electrochemical impedance spectroscopy. The effects of some experimental factors for methanol electro-oxidation, such as methanol concentration, scan rate and temperature were studied on the prepared catalyst. The activation energy of the anodic peak of methanol oxidation at Pt-LFO/PA-CH was also calculated and its value was obtained 14.17 kJ mol-1. The catalytic activity of Pt-LFO/PA-CH catalyst for methanol electro-oxidation was compared with Pt/PA-CH catalyst. The electrochemically active surface area of Pt-LFO/PA-CH catalyst (77.46 m2g-1Pt) was obtained more than Pt/PA-CH (54.69 m2g-1Pt). At methanol concentration of 1.76 M, the anodic peak current density of methanol oxidation at Pt-LFO/PA-CH (377.58 mA cm-2) was obtained more than Pt/PA-CH catalyst (203.67 mA cm-2). Higher electrochemically active surface area and current density of Pt-LFO/PA-CH for methanol oxidation indicating very improved catalytic activity of Pt-LFO/PA-CH for methanol electro-oxidation. Thus, the prepared catalyst can be utilized as effective catalyst for methanol electro-oxidation in direct methanol fuel cells. Manuscript profile

Open Access Article

20 - Study and investigation on the formation of NbAl3-based nanocomposite reinforced by Al2O3 particles: microstructural and thermal analysis investigation
Hossein Mostaan Mahdi Rafiei Mohammad Hasan Abbasi Fathollah Karimzadeh

20.1001.1.24233226.1397.12.2.5.6

The aim of this research is fabrication of NbAl3-based nanocomposite via mechanical alloying in order to increase its toughness and high-temperature strength. For this purpose, mixtures of 49 wt.% of aluminum and 51 wt.% of niobium oxides were mixed and mechanically all More

The aim of this research is fabrication of NbAl3-based nanocomposite via mechanical alloying in order to increase its toughness and high-temperature strength. For this purpose, mixtures of 49 wt.% of aluminum and 51 wt.% of niobium oxides were mixed and mechanically alloyed. Phase evolutions, microstructure and morphology of powder particles during milling were studied using X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In order to study the thermal behavior of powder particles, annealing treatment and differential thermal analysis (DTA) were carried out. It was found that the reaction between aluminum and niobium oxide is explosive and during this reaction NbAl3-based nanocomposite reinforced by Al2O3 particle is formed. The as-blended powders were studied by DTA and the results showed that in this condition NbAl3/Al2O3 composite is formed within two stages. At the first step, Nb2O5 is reduced by aluminum. At the second step, the retained aluminum is reacted by niobium and finally NbAl3/Al2O3 composite is formed. Observations by TEM revealed formation of nanostructure and nano-sized reinforcement particles. Manuscript profile

Open Access Article

21 - Investigations of ethanol, ethylene glycol and deionized water solvents effects on structural and optical properties of Ag-CuO hybrid nano-material synthesized by solvo/hydrothermal-microwave method
Mehrdad Soltani Farid Jamali-Sheini

20.1001.1.24233226.1397.12.3.13.6

In this research work, the synthesis of hybrid silver (Ag) and copper oxide (CuO) was carried out by solvo/hydrothermal-microwave process in the deionized water (H2O), ethanol (C2H6O) and ethylene glycol (C2H6O2) solvents and the effects of solvent type on structural an More

In this research work, the synthesis of hybrid silver (Ag) and copper oxide (CuO) was carried out by solvo/hydrothermal-microwave process in the deionized water (H2O), ethanol (C2H6O) and ethylene glycol (C2H6O2) solvents and the effects of solvent type on structural and optical properties were studied. The obtained samples were characterized by X-ray diffractometer (XRD), scanning and transmission electron microscopies (SEM and TEM), photoluminescence (PL) and absorption spectroscopies (UV-Vis). The XRD study of the samples showed presence of Ag (Cubic) and CuO (Monoclinic (phase in the obtained materials. Elemental analysis (EDS) showed presence of Ag, Cu, and O in the samples. Electron microscopes images revealed non-regular and impacted samples of Ag and CuO. The intensity of emission band of synthesized nanostructures in ethanol and ethylene glycol were reduced and it was observed a shift in the absorption edge towards lower wavelength (blue shift) in compared with synthesized samples in deionized water. Manuscript profile

Open Access Article

22 - The presence effect of H2O, benzyl alcohol and CNT percent on the properties of TiO2-CNT nanocomposite synthesized by in-situ sol-gel method
alireza shafei Saeed Sheibani

20.1001.1.24233226.1397.12.3.12.5

In this paper, nano-composite powder of TiO2 and multi-walled carbon nanotubes (CNTs) was synthesized by in-situ sol-gel method. The effect of processing parameters of benzyl alcohol, H2O and CNT content (1 and 10 wt.%) on the prepared powder morphology was investigated More

In this paper, nano-composite powder of TiO2 and multi-walled carbon nanotubes (CNTs) was synthesized by in-situ sol-gel method. The effect of processing parameters of benzyl alcohol, H2O and CNT content (1 and 10 wt.%) on the prepared powder morphology was investigated. The samples were characterized via field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analysis. Firstly, the influence of calcination stage on the powders structure was evaluated. XRD results showed amorphous structures for the composite powders before calcination and the dominant structure of anatase TiO2 after calcination treatment. FESEM results showed a non-uniform and agglomerated morphology without benzyl alcohol. Furthermore, addition of Tetrabutyl-orthotitanate solution to the initial solution containing H2O as the hydrolysis agent resulted in finer powder microstructure with uniform coating of TiO2 on CNTs due to slower hydrolysis reaction. The effect of CNTs on the morphology depends on percent of CNTs. Also, composite powder with higher particle size was formed with the decrease of CNT content from 10 to 1 percent which is attributed to the decreased and less accessible surface area to TiO2 particles formation. Manuscript profile

Open Access Article

23 - Investigation of reducing agent type on the synthesis behavior and microstructure of Ni-Cr-Mo alloy synthesized by microwave-assisted combustion synthesize
Mostafa Tahari Jalil Vahdati khaki Mostafa Mirjalili

This research investigated the effect of reducing agent type on the synthesis behavior and microstructure of Ni-Cr-Mo alloy, which was synthesized by microwave-assisted self-propagation high-temperature. For this purpose, powder mixtures with the same amount of NiO, MoO More

This research investigated the effect of reducing agent type on the synthesis behavior and microstructure of Ni-Cr-Mo alloy, which was synthesized by microwave-assisted self-propagation high-temperature. For this purpose, powder mixtures with the same amount of NiO, MoO3, and Cr2O3 as precursors and different ratios of aluminum to silicon as reductants were prepared. The mixtures were homogenized, compacted to a 20 mm diameter disk, and synthesized by a microwave oven. Results show that although the adiabatic temperature in the silico-thermic sample exceeded the merzhanov criteria, the synthesizing did not occur due to Si high-temperature melting point. The maximum recovery efficiency of Ni and Mo was observed in the Al50 with 92% and 96%, respectively. But, the recovery efficiency of Cr in this sample was 36%, which is very low. Using excess Al in 1.1 and 1.2 times more than the stoichiometric ratio in the Al50ex1.1 and Al50ex1.2 leads to the recovery efficiency of Cr rising 25% and reaching 45%. The presence of residual Si in the produced alloys caused to formation Mo2Ni3Si phase, which is a Mo and Si reach the compound. Microstructural investigation shows residual Si content, and Mo2Ni3Si phase percent were increased by adding excess Al in the initial mixtures. Also, the Mo2Ni3Si proeutectic phase has petaloid morphology. Although the Mo2Ni3Si phase is not formed in the Al100 sample, the severe segregation of Mo led to a continuous network of semi-dual phases in the dendrite boundary. Manuscript profile

Open Access Article

24 - Synthesis of Lanthanum Hexaaluminate (LaMgAl11O19) Powder in order to plasma spary coating on the nickel superalloy as Thermal Barrier coating
mohammad mehdi khorramirad محمد رضا رحیمی پور سید محمد مهدی هادوی کوروش شیروانی جوزانی

20.1001.1.24233226.1397.12.3.14.7

Lanthanum hexaaluminate (LaMgAl11O19) as a new thermal barrier coating due to the properties and superior features is selected as a preferred composition instead of yttria -stabilized zirconia (YSZ) Composition. In this paper, synthesis of this composition by solid stat More

Lanthanum hexaaluminate (LaMgAl11O19) as a new thermal barrier coating due to the properties and superior features is selected as a preferred composition instead of yttria -stabilized zirconia (YSZ) Composition. In this paper, synthesis of this composition by solid state reaction method was investigated then it was prepared to coat by atmospheric plasma spraying (APS) method. Scanning electron microscope with X-ray microanalysis (SEM-EDS), differential thermal analysis (TGA/DTA), X-ray diffraction (XRD) were used to characterize of the synthesized powder, granules and free standing as-sprayed LaMgAl11O19 coating. In this research first, α-Al2O3 powder was used as a raw material. The results showed that this material was not suitable for the synthesis of this compound. Therefore γ-Al2O3 powder was used. As a result of that, a single phase compound with plate-like morphology was formed and the synthesis temperature was 1330 Cº. Also α-Al2O3, LaAlO3 and MgAl2O3 compounds were formed at 850-1100 ºC that the final phase transformation was occurred due to reaction between these three compounds. From the phase analysis results, it can be concluded that the main role of γ -Al2O3 phase in structure is to reduce the synthesis temprature of MgAl2O4 spinel phase to a temperature of less than 1100 ºC. Also chemical analysis results of granules and APS coating with optimal parameters indicated the existence of single phase structure and the second phase was not found. Manuscript profile

Open Access Article

25 - Synthesis and characterization of hollow mesoporous Silica nanocomposites via polystyrene template
Abolhassan Najafi Mahdi Khoeini Mostafa Amani

20.1001.1.24233226.1399.14.1.4.7

In this study, the synthesis of hollow mesoporous silicate particles was studied using TEOS precursor in the presence of a polystyrene template and CTAB surfactant micelles. The process was carried out in based on alcoholic system with pH control and adding CTAB surface More

In this study, the synthesis of hollow mesoporous silicate particles was studied using TEOS precursor in the presence of a polystyrene template and CTAB surfactant micelles. The process was carried out in based on alcoholic system with pH control and adding CTAB surface activator at a suitable concentration. The results of the FTIR analysis showed that the pre-forming particles of TEOS formed surface boundaries during the synthesis process with CTAB surfactant agents. Also the presence of Si-O-Si bonds (range from 600 to 1320 cm-1) indicates the formation of silicate chains on polystyrene molds. Thermal analysis studies showed that using appropriate heat treatment and precise control, all organic compounds can be removed from the system and synthesized hollow mesoporous silica particle with the least structural defects at 380°C. The BET analysis showed that the specific surface of these synthesized mesoporous silicate particles is 1180 m2.g-1 X-ray diffraction results showed that the product obtained was amorphous silica and impurity phases are not formed in this system. The DLS analysis showed that the synthesized particles had dimensions ranging in size from 1 to 10 nm and the distribution of particle size has occurred in a narrow range. SEM images confirm the sphericality of nanoparticles with a mean size of 25-30 nm. Finally, the transmitted electron microscope images showed that the synthesized silicate particles were hollow, so that the diameter of the hollow cavity and its entire total diameter are about 30 and 80 nm, respectively. Manuscript profile

Open Access Article

26 - Investigating the effect of nickel particle size and green density on the properties of NiAl-TiB2-TiC composite produced by combustion synthesis
Mandana Adeli Rasoul Abdollahpour Mansour Soltanieh

20.1001.1.24233226.1398.13.3.5.5

In this study, the effect of nickel particle size and green density on the formed phases, ignition time, and porosity distribution in NiAl-TiB2-TiC composite produced by combustion synthesis method was investigated. For this purpose, reactive powders were weighed and mi More

In this study, the effect of nickel particle size and green density on the formed phases, ignition time, and porosity distribution in NiAl-TiB2-TiC composite produced by combustion synthesis method was investigated. For this purpose, reactive powders were weighed and mixed to form a mixture of Ni + Al + x (3Ti + B4C). The green mixture was compressed in the form of a cylinder. The samples were synthesized using an induction furnace which the sample with a constant heating rate. The reaction was ignited in a quartz tube under a flow of argon gas. The microstructure of the products was examined using Scanning Electron Microscopy (SEM), and the phases were determined using X-ray diffraction (XRD). The amount of open, closed and total porosity was measured using Archimedes method, and the distribution of porosity was analyzed by using image analysis software. The results showed that by decreasing the average particle size of nickel from 87µm to 3µm, due to increase in contact surfaces, there was a decrease in ignition time of the samples, and more intensive reactions were encountered. Using finer nickel resulted in a ca. 10% decrease in the porosity of products. The minimum ignition time was obtained at green density of 85%. Increase in the relative density of green sample reduced the amount of secondary open pores; the porosity of the samples with a relative density of 65% and 95% was 58.8% and 26.9% after synthesis, respectively. Manuscript profile

Open Access Article

27 - Synthesis of Nickel-Nickel oxide foam by electrochemical method and its application in supercapacitor
Majid Mirzaee Changiz Dehghanian

20.1001.1.24233226.1398.13.2.2.0

This paper investigates the applicability of nickel-nickel oxide metallic foams as a current collector for supercapacitor. A simple galvanic displacement reaction was employed to fabricate dendritic Cu dealloyed nanoporous Ni-NiO foam. A comprehensive characterization o More

This paper investigates the applicability of nickel-nickel oxide metallic foams as a current collector for supercapacitor. A simple galvanic displacement reaction was employed to fabricate dendritic Cu dealloyed nanoporous Ni-NiO foam. A comprehensive characterization of foams are presented and includes the analysis of their structural, chemical, and electrochemical properties. The process is studied under well-defined experimental conditions using XRD, SEM, electrochemical impedance spectroscopy (EIS) and galvanostatic charge and discharge (GCD). XRD results confirm the presence of nickel and nickel oxide phases. Also, in the SEM test, porosities were observed in the range of micro and dendrites in the nanoscale. The outcome of these experiments demonstrates that the Ni-NiO foam has a higher specific capacitance. The best specific capacitance for Ni-NiO foam was calculated 924 F/g at 1A/g. Ni-NiO foam maintains 81.8% of its specific capacitance at a current density of 20 A/g and after 3000 cycles. The created foam electrode can be used as a current collector for the deposition of subsequent layers and is a candidate for use in supercapacitors. Manuscript profile

Open Access Article

28 - Fabrication of Ni-VC Nano composite powder from oxide reactants by mechanochemical method
Seyed Amir Hossein Emami Seyed Kamal Hosseini Danial Davoodi

20.1001.1.24233226.1397.12.4.3.8

This research aims to produce Ni-Vanadium Carbide composite nano powder, known as a hard metal, from oxide raw materials and magnesium as a reductant, using mechano-chemical method. With regard to the adiabatic temperature (T=3964 K), this reaction is a mechanically ind More

This research aims to produce Ni-Vanadium Carbide composite nano powder, known as a hard metal, from oxide raw materials and magnesium as a reductant, using mechano-chemical method. With regard to the adiabatic temperature (T=3964 K), this reaction is a mechanically induced Self-sustaining (MSR) type. Raw materials were mixed according to stoichiometry reaction with a ratio of (1:1:6:2) for Nickel oxide, Vanadium oxide, Magnesium and graphite respectively. Milling was carried out in a planetary ball mill with a powder to ball ratio of 1:20 under argon gas atmosphere. After 40min of milling, combustion occurred out in the mill chamber. With regard to the results of X-ray difraction after the combustion, the intended products; that are, Nickel, Vanadium Carbide and Magnesium Oxide which is by-product of the reaction, were completely produced. HCl with a concentration of 9% was used to remove the magnesium oxide phase. The crystallite size and lattice strain were calculated using Williamson-Hall method, and the crystallite size and lattice strain of Ni and Vanadium Carbide were obtained 40nm, 0.00595, 54nm, 0.00615, respectively. Manuscript profile

Open Access Article

29 - Electrochemical deposition of hematite and investigation of its photoelectrochemical properties for water splitting
Gholamreza Heidari

20.1001.1.24233226.1397.12.4.8.3

Production of hydrogen using photoelectrochemical water splitting is a promising method for production of clean and renewable energy source. Using positive and negative semiconductors respectively as photocathode and photoanode, water can be splitted into hydrogen and o More

Production of hydrogen using photoelectrochemical water splitting is a promising method for production of clean and renewable energy source. Using positive and negative semiconductors respectively as photocathode and photoanode, water can be splitted into hydrogen and oxygen. In this study, hematite was synthesized using electrochemical deposition. The diffraction pattern obtained using x-ray diffraction showed hematite having rhombohedral crystal structure. Surface morphology obtained by scanning electron microscope showed a two-layer structure, lower layer with cracks and upper layer consisting of particles. Photocurrent density was obtained using linear sweep voltammetry under chopped illumination and it was obtained at 0.6V vs Ag/AgCl as 2.5 μA.cm-2. Nyquist plot of hematite at potentials of 0V and 0.6V was obtained using electrochemical impedance spectroscopy and an equivalent circuit was fitted to EIS data and the value of the parameters was obtained. Also, using Mott-schottky plot, the flat band potential and the carrier density were obtained to be -0.35V vs Ag/AgCl and 8.4×1018 cm-3. Manuscript profile

Open Access Article

30 - Synthesis of Ag doped ZnO nanoparticles by Pechini sol-gel method and investigation of their photocatalytic properties
Hamid Reza Yousefi Babak Hashemi

20.1001.1.24233226.1397.12.4.6.1

Zinc oxide is a semiconductor which has photo-catalyst properties and could be used for degradation of organic materials. In this research silver doped zinc oxide nanoparticles were synthesized using Pechini sol-gel method in order to investigate its photo-catalyst prop More

Zinc oxide is a semiconductor which has photo-catalyst properties and could be used for degradation of organic materials. In this research silver doped zinc oxide nanoparticles were synthesized using Pechini sol-gel method in order to investigate its photo-catalyst properties. Nanoparticles show good photo-catalyst properties due to high surface area to volume ratio and adding of noble metals to semiconductor decreases recombination of electron-hole. Samples with different weight percentages of silver (0.6, 1.8, 3.1 and 6.2) were synthesized. Samples were characterized by UV-Visible spectroscopy, X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Field Emission Scanning Electron Microscope (FESEM), Energy-Dispersive X-ray spectroscopy and Photo luminance Spectroscopy. Photo-catalyst properties of samples were analyzed by degradation of methylene blue. Results showed that Ag doping decreased the particle size of samples and the sample containing 1.8% Ag had maximum rate in degradation of methylene blue solution and this was coincidence with PL results. Adding of Ag to ZnO decreased recombination rate of electron-hole in oxide and therefore increased photo-catalyst properties of samples or degradation rate of solutions. To confirm the decolorization repeatability of the synthesized samples, three photocatalytic cycles were performed on the sample containing 1.8% wt% of silver. It was observed that the decolorization efficiency of sample was not significantly reduced, and it is indicate that the synthesized catalyst is stable and functional. Manuscript profile

Open Access Article

31 - Production of cupper manganese ferrite cadmium doped nanoparticles via co precipitation method and study of its sensitivity property for methane gas detection in telecommunications centers
Hossein Emami Seyed Mohsen Etesami

20.1001.1.24233226.1398.13.2.6.4

In this study, synthesis and studying sensitivity of nano particles of manganese copper ferrite with common formula of cupper manganese ferrite cadmium doped has been considered. Applied method for manufacturing this nanoparticle is co-precipitation method that is a nov More

In this study, synthesis and studying sensitivity of nano particles of manganese copper ferrite with common formula of cupper manganese ferrite cadmium doped has been considered. Applied method for manufacturing this nanoparticle is co-precipitation method that is a novel method for this combination. Nano particle structure has been investigated using experiments such as X-ray diffraction which showed single–phase and Nano characteristics of this combination and scanning electron microscope which showed the size of nanoparticles and uniformity. Sensitivity of the nano particles was tested using a laboratory system equipped with sensor heater with the ability of temperature control on which nano sensor was put, a chamber for injecting related materials and a connector electronic range that transferred Nano-sensor information to computer and it was analyzed by a software. This system could control temperature. This Nano sensor was tested using Methane that sensitivity and suitable temperature for this Nano sensor was 300˚C. Manuscript profile

Open Access Article

32 - Study on phase, structural changes and microwave absorption of magnetic powder with BaZn0.6Zr0.3X0.3Fe10.8O19 (X=Ti,Ce,Sn) composition
Mohsen Salehi Sahebali Manafi Seyed Salman Seyed Afghahi Mojtaba Jafarian

20.1001.1.24233226.1399.14.2.7.2

In this research, barium hexaferrite samples with BaZn0.6Zr0.3X0.3Fe10.8O19 (X=Ti,Ce,Sn) composition were synthesized via mechanical activation method and were evaluated by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), vibrating sample magnetomet More

In this research, barium hexaferrite samples with BaZn0.6Zr0.3X0.3Fe10.8O19 (X=Ti,Ce,Sn) composition were synthesized via mechanical activation method and were evaluated by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), vibrating sample magnetometer (VSM) and Vector network analysis (VNA). X-ray diffraction results confirmed the present of barium hexaferrite as a dominant phase with small amount of hematite as a non-magnetic phase in the sample compound. Lattice parameters a and c was increased due to the difference between ionic radius of guest and host ions and the largest increases was related to the sample that containing cerium ion. The FE-SEM results confirmed the average particles size of about 450 nm and 250 nm for samples without and with dopant respectively. According to M-H curves the value of saturation magnetization (Ms) and coercive force (Hc) was reduced in all cases and significant changes were observed in magnetic properties of barium hexaferrite with the effect of substitution of Fe ions. According to the results maximum magnetic saturation (33.1 emu/g) and minimum coercivity force (8.14 Oe) were related to samples with composition of BaZn0.6Zr0.3Ti0.3Fe10.8O19 and BaZn0.6Zr0.3Sn0.3Fe10.8O19 respectively. According to the results of microwave absorption in the frequency range of 8-12.4 GHz the maximum absorption was related to the sample with the composition of BaZn0.6Zr0.3Sn0.3Fe10.8O19 at the frequency of 11.1 GHz was -16.3 dB. Manuscript profile

Open Access Article

33 - Synthesis and Characterization of polyurethane/silver nanocomposite by Microwave assisted
seyed mohamad kazemzadeh Mohamad Reza Vaezi Seyyed Mohammad Mehdi Hadavi Masoud Esfandeh

20.1001.1.24233226.1397.12.4.9.4

In this study, the dielectric heating was performed by microwave irradition to synthesize polyurethane/silver nanocomposite, which was carried out by distributing and dissolving silver nitrate salt in the polyurethane and the reduction of silver cation retained in ethyl More

In this study, the dielectric heating was performed by microwave irradition to synthesize polyurethane/silver nanocomposite, which was carried out by distributing and dissolving silver nitrate salt in the polyurethane and the reduction of silver cation retained in ethylene glycol micelles in the prepolymer solutions. Decreasing the time and number of synthesis processes and, consequently, reducing production costs is one of the advantages of this technique. During the chemical reactions, microwave waves with constant intensity and frequency at 30, 60, 90, 120 seconds were applied to solvent prepolymer by a microwave oven. By completion of the chemical reactions, silver nanoparticles were synthesized in a polyurethane matrix. The effect of microwave and insitu synthesis of and silver nanoparticles on chemical bonding of polyurethane in terms of structure, morphology, composition and particle size distribution were studied by using UV-Vis spectroscopy, X-ray diffraction (XRD), transmitted electron microscopy (TEM), X-ray diffraction spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR) analysis. Produced nanoparticles have spherical and semi spherical morphology with particle size distribution in the range of 10 to 80 nm, and the fcc crystalline structure and uniform dispersion in the polyurethane matrix. Meanwhile, Fourier transform infrared spectroscopy of nanocomposites showed synthesis of silver nanoparticles no negative effect on polyurethane chemical bonds by this method. Manuscript profile

Open Access Article

34 - Synthesis, Identification and Application of Polyacrylamide Polystyrene/Bentonite Nanocomposite for Adsorbing of Lead and Cadmium from Contaminated Water
Amir Ebrahim Baradaran Mahdavi Ebrahim Panahpour Roozbeh Javad Kalbasi Ali Gholami

20.1001.1.24233226.1398.13.4.6.8

During last decade, the construction and application of various adsorbents of heavy metals have been interested by many researchers. Nanocomposites with high surface areaandporosity can remove large amount of these contaminants from aques media. In this research, nanoco More

During last decade, the construction and application of various adsorbents of heavy metals have been interested by many researchers. Nanocomposites with high surface areaandporosity can remove large amount of these contaminants from aques media. In this research, nanocomposites of polyacrylamide-polystyrene/bentonite synthesized,and identified. The effective parameters effective on adsorption Cd+2,Pb+2 cations including pH, Bentonite / Polyacrylamide ratio, adsorption rate, time contact, cationic and cationic activity of adsorption activity were illustrated. The structure of nanocomposites was carried out by TEM, BET, FT-IR and XRD methods. The rates of lead and cadmium adsorption were measured by atomic absorption. The results of microstructural investigations showed that in polyacrylamide-polystyrene/bentonite nanocomposite the interlayer distance in crystal structure and specific surface increased significantly in comparison with the modified bentonite. Also, the results approved that the highest adsorption at pH = 6, the best ratio of bentonite to polyacramide 2. 5: 5, the optimum absorbance was 5 g / l, the duration of the call was 12 hours, and the highest metal adsorption at 150 mg /l concentration. Manuscript profile

Open Access Article

35 - Green Synthesis of Fe3O4/SiO2/ZnMn2O4 Nanocomposite by AleoVera Extract and its Application as a Catalyst in Luminol-H2O2 Chemiluminescence
Abbas Eslami Ensieh Gholamrezapor Mohammad Javad Chaichi Afsaneh Nemati

20.1001.1.24233226.1399.14.3.7.4

Synthesis of metal oxide nanoparticles using microorganisms and plants, so-called green synthesis methods, has received a great amount of attention because of its easy and inexpensive synthesis condition with respect to usual chemical and physical methods. The luminol c More

Synthesis of metal oxide nanoparticles using microorganisms and plants, so-called green synthesis methods, has received a great amount of attention because of its easy and inexpensive synthesis condition with respect to usual chemical and physical methods. The luminol chemiluminescent reaction is among well-known quantitative methods in analytical spectroscopy due to its high sensitivity to presence of catalyst and low background signal. In this study, Fe3O4/SiO2/ZnMn2O4 nanocomposite was prepared by the green method using Aloe Vera extract solution and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometer (VSM). These magnetic nanoparticles were used as a catalyst in the luminol-H2O2 chemiluminescence system. The obtained results indicated that these nanoparticles have good catalytic activity in the chemiluminescence system so that the emission intensity was increased about fourfold in presence of catalyst at 3 second. The recovery of this catalyst was easily performed by an applying external magnetic field. Manuscript profile

Open Access Article

36 - Synthesis of Nickel Ferrite / Cadmium Oxide Compound Nanoparticles by Co-precipitation Method and Investigation its Sensitivity to Formaldehyde
saied nosohiyan Hamid Reza Ebrahimi amirabas nourbakhsh Gholam Reza Amiri

20.1001.1.24233226.1399.14.3.5.2

In this study, NiFe2O4-CdO compound nanoparticles were prepared through co-precipitation. The two variables of the synthesis method are, respectively, the temperature gradient reaching the temperature of the heat treatment of 500 ° C at 10°C/sec, 35°C/sec an More

In this study, NiFe2O4-CdO compound nanoparticles were prepared through co-precipitation. The two variables of the synthesis method are, respectively, the temperature gradient reaching the temperature of the heat treatment of 500 ° C at 10°C/sec, 35°C/sec and 60 °C/sec and the pure oxygen pressure as the heat treatment atmosphere for 0.5 hours, at 0.5 psi, 1 psi, and 1.5 psi. So, we found 9 samples, that the sample with the best sensitivity response to formaldehyde was characterized. X-ray diffraction, scanning electron microscopy, transition electron microscopy and X-ray fluorescence experiments were used to study the structure of these nanoparticles. X-ray diffraction experiment is confirmed formation of nickel ferrite and cadmium oxide phases. Scanning electron microscopy and transition electron microscopy experiments are confirmed nickel ferrite and cadmium oxide being nano-structure. NiFe2O4-CdO formula ratio is confirmed by X-ray fluorescence experiment. The sensitivity property of NiFe2O4-CdO nanoparticles for formaldehyde gas detection was studied at 50 °C. For testing the sensitivity of nanosensors, we used a laboratory 5 liters system with temperature and humidity control. This system equipped with a temperature control heater for heating sensors. Relationship between gas concentration (from 10 ppm to 200 ppm) and resistance change of nano sensor with the best response to formaldehyde was investigated, that this relationship was found linear. Manuscript profile

Open Access Article

37 - Investigation of Electromagnetic Properties and Microwave Absorption of Z-Type HexFerrite with Zinc Substitution
zinat mirzaei mohammad jazirehpour ahmad poorbafrani

20.1001.1.24233226.1399.14.3.6.3

In this research, the effect of different substitution quantities of zinc cations on electromagnetic and microwave absorption properties of Z-type barium hexaferrite with chemical composition of Ba3Co2-xZnxFe24O41 (x=0, 1.2, 1.3, 1.4, 1.5, 2) generated by high energy mi More

In this research, the effect of different substitution quantities of zinc cations on electromagnetic and microwave absorption properties of Z-type barium hexaferrite with chemical composition of Ba3Co2-xZnxFe24O41 (x=0, 1.2, 1.3, 1.4, 1.5, 2) generated by high energy milling method was studied. X-ray diffraction (XRD) method was used to verify the formation of Z type Ba-hexaferrite phase in the synthesis conditions. Magnetization properties of different compositions were studied by alternative gradient force magnetometery (AGFM). X-ray diffraction (XRD) method was used to confirm the formation of Z-type Ba-hexaferrite phase. The investigations by AGFM showed that the amount of magnetization increased by substituting the desired composition. So that the amount of magnetization (67 emu/g) for an unsubstituted sample will reach its maximum (84 emu/g) for the sample with composition of . In addition, complex permeability and permittivity coefficients of the samples were studied by vector network analyzer (VNA). Using the measured coefficients, reflection loss curves were plotted. The results of the reflection loss (RL) plots showed that, on average, the maximum absorption bandwidth occurred among the samples at a frequency range of 4-8 GHz. The best absorption (the most negative reflectance loss) was observed at -47 dB and at a frequency of 7 GHz for the sample with an index of substitution of x=1.3. Manuscript profile

Open Access Article

38 - Characterization of Electro Synthesized Perovskites Structured Ybmno3 Nanoparticles
hamid mohmmad shiri Saab Sadeghi Reza Safari Ali Ehsani Hamid Reza Ebrahimi hamid hadi

10.30495/apme.2021.1926291.2037

20.1001.1.24233226.1400.15.4.4.0

Prosciuttoes are compounds that have the general formula ABO3, such as YbMnO3. In this research, YbMnO3 nanostructure has been synthesized by electrochemical deposition technique which is the green simple and new method. Then, XRD, DSC, SEM and EDS characterization test More

Prosciuttoes are compounds that have the general formula ABO3, such as YbMnO3. In this research, YbMnO3 nanostructure has been synthesized by electrochemical deposition technique which is the green simple and new method. Then, XRD, DSC, SEM and EDS characterization tests were performed on the synthetic sample and the obtained results were analyzed. In addition, the morphological and structural properties of the synthetic nanomaterial showed that the main product was YbMnO3, with a nanoscale agglomerated structure with a particle size estimated at 35.5 nm. Also, some mechanical quantities, such as stress, strain, lattice constants and particle size of the synthetic perovskite compound, are calculated using the Scherer equation and the Williamson-Hall method, and the results were obtained with the results (values) obtained from the XRD spectra. And SEM were compared. It is predicted that the result of this research can open new horizons in the low-cost synthesis of eco-friendly (green Chemistry) nanomaterials and nanoparticles. Manuscript profile

Open Access Article

39 - The Effect of Gd Cation Substitution on the Structural and Electromagnetic Properties of Z-Type Barium Hexaferrite
Mohammad Jazirehpour Ahmad Poorbafrani Zinat Mirzaei

20.1001.1.24233226.1401.16.3.6.7

The effect of gadolonium cation substitution on the structural and electromagnetic properties of Z-type barium hexaferrite was investigated in this study. This group of compounds is known as Ba3Co2-xGdxFe24O41, and it was created using the energetic milling approach wit More

The effect of gadolonium cation substitution on the structural and electromagnetic properties of Z-type barium hexaferrite was investigated in this study. This group of compounds is known as Ba3Co2-xGdxFe24O41, and it was created using the energetic milling approach with substitution values of 0, 0.1, 0.3, 0.5, 0.8, 0.1, and 1.2. X-ray diffraction (XRD) analyses and scanning electron microscopy (SEM) photos of Ba3Co1.6Gd0.4Fe24O41 samples were obtained to investigate the phase formation temperature and the effect of particle size on the properties of this compound. A network vector analyzer was used to assess the real and imaginary components of the samples' electrical permittivity (ε) and magnetic permeability (μ) in order to evaluate their electromagnetic properties (VNA). Using these coefficients, reflection loss diagrams of the compounds were created in the frequency range of 1-18 GHz. By examining the samples in terms of maximum absorption intensity and bandwidth at the same time, the samples with Gd substitution with x = 0.5 in the frequency bands S and C1, the sample with x = 0.3 in the band C2, the sample with x = 0.3 in the X band, the sample with x = 0.1 in the X band, and the sample with x = 1.2 in the Ku band were chosen as the optimal samples (S: 1-2 GHz, C1: 2-4 GHz, C2: 4-8 GHz, X: 8-12 GHz, Ku: 12-18 GHz). Manuscript profile

Open Access Article

40 - Synthesis of Cadmium Doped Nickel Copper Ferrite Nanoparticles and Investigation of Their Sensing Properties for the Detection of Acetonitrile in Little Accounts
Hossein Emami Hamid Reza Ebrahimi

10.30495/apme.2021.1908397.2011

In this study cadmium doped nickel copper ferrite Ni0.5Cu0.5Fe2O4 (cd doped) nanoparticles with spinel structure were synthesized using co-precipitation method. The nanoparticles were employed as a gas sensing material. X-ray diffraction (XRD), X-ray fluorescence (XRF) More

In this study cadmium doped nickel copper ferrite Ni0.5Cu0.5Fe2O4 (cd doped) nanoparticles with spinel structure were synthesized using co-precipitation method. The nanoparticles were employed as a gas sensing material. X-ray diffraction (XRD), X-ray fluorescence (XRF) and transmission electron microscopy (TEM) techniques were used to characterize the nanoparticles structure. The sensing behavior of the nanoparticles was examined in the presence of different gases including. Acetone, acetonitrile, acrylonitrile, formamide, caron tetrachloride, vinyl acetate, ethanol, ammonia, and methanol. The characterization process was performed for a concentration of a 200 ppm and within a temperature interval from 50 ˚C to 300 ˚C and the best sensing behavior was found to be at 200 ˚C. Furthermore, various concentrations of acetonitrile gas at 200 ˚C within a concentration interval of 20 to 200 ppm were tested and it is found that the higher concentrations will result in a better response. Manuscript profile

Open Access Article

41 - Evaluation of Photocatalytic and Antibacterial Properties of Zno–Cuo Nanocomposites Synthesized by Sol-Gel Method
Seyedeh Zahra Anvari Mohammad Hajeb Mahmoud Fazel

10.30495/apme.2021.1922834.2031

In this research CuO and ZnO and CuO-ZnO nanocomposites were synthesized using sol- gel method. The samples were characterized by DRS-UV, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The results of XRD showed that the CuO and ZnO and More

In this research CuO and ZnO and CuO-ZnO nanocomposites were synthesized using sol- gel method. The samples were characterized by DRS-UV, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The results of XRD showed that the CuO and ZnO and ZnO-CuO composite are crystalline. The results of the DRS-UV analysis showed that the CuO, ZnO, and ZnO-CuO composite, respectively, have a mean band gap of 1.27 and 3.21 and 2.43 eV. According to calculations CuO, ZnO and ZnO-CuO composite show 40, 10 and 68% of degradation efficiency against of rhodamine B dye, respectively. Therefore, the addition of CuO to ZnO increased the photocatalytic activity of the products. The mechanism of photocatalytic activity of synthetic products and copper oxide is discussed in the process of increasing the photocatalytic process intervals. ZnO-CuO nanocomposite has an antibacterial ability against Staphylococcus aureus as a positive bacterium and E. coli as a negative bacterium. Manuscript profile

Open Access Article

42 - Synthesis of Zinc Ferrite Ferrofluid and Investigation of its Rheology and Magnetic Properties
Farshid Mahdavi Babak Hashemi

20.1001.1.24233226.1401.16.1.6.3

In this study, we first synthesized zinc ferrite nanoparticles by using co-precipitation method and adding zinc to iron ferrite in different amounts. Redistribution of Fe and Zn cations in tetrahedral and octahedral locations can significantly alter and increase saturat More

In this study, we first synthesized zinc ferrite nanoparticles by using co-precipitation method and adding zinc to iron ferrite in different amounts. Redistribution of Fe and Zn cations in tetrahedral and octahedral locations can significantly alter and increase saturation magnetization. The saturation magnetization of the synthesized ferrite nanoparticles was 57% higher than that of iron ferrite, and the nanoparticles had an average size of 35 nm. The synthesized nanoparticles were then functionalized using oleic acid and polyethylene glycol and three types of stable fluids based on water, engine oil and ethylene glycol were prepared. Optimal Ferro-fluid with the highest stability properties and amount of saturated magnetization was used to investigate the rheological properties. The non-Newtonian behavior of the fluid with different percentages of nanoparticles was investigated and the greatest change in behavior from the Newtonian state was related to the fluid with 15% by volume of nanoparticles. Manuscript profile

Open Access Article

43 - Preparation of Magnetic Nano Composite Modified with Orange Peel for Adsorption of Vitamin B5 from Aqueous Solution
Seyyedeh Ghazaleh Hashemipour Zavareh Fariba Tadayon Ruhollah Karami Osboo

20.1001.1.24233226.1401.16.2.3.2

One of the most important vitamins for human life is pantothenic acid (B5), because of its advantages such as production of blood cells, adrenal gland activity, stress management and energy production. The presence of this vitamin is important for plant growth and food More

One of the most important vitamins for human life is pantothenic acid (B5), because of its advantages such as production of blood cells, adrenal gland activity, stress management and energy production. The presence of this vitamin is important for plant growth and food production, because of its adsorption and determination were studied more than before.  Magnetic Nano adsorbent has been attracted great attention in the field of separation due to the simplicity, low cost and high speed. In this paper, the magnetic Nano composite modified with orange peel for adsorption efficiency of vitamin B5 from aqueous solution was synthesized. The Nano adsorbent structure was characterized using SEM-EDX, FTIR and XRD. The influence of adsorption parameters including pH, contact time, adsorbent dosage and initial concentration of B5 onto Nano adsorbent were evaluated. The best sorption of B5 via the Nano sorbent occurred at concentration of 300 mg L-1, 0.1 g of Nano adsorbent, 90 min of contact time at an optimum pH of 6. The Langmuir isotherm model (R2= 0.9899) was found to be fit with the isotherms data. The best kinetic model fit for adsorption of B5 from Nano adsorbent was found with the pseudo-first-order model (R2=0.9999). Manuscript profile

Open Access Article

44 - ساخت الکترودهای ابرخازنیِ نیکل منگنز اکسید (NiMnO3) نانوصفحه‌ای با استفاده از روش سنتز
Seyed Ali Hosseini Moradi Nader Ghobadi majid amirzade

20.1001.1.24233226.1402.17.2.3.9

The use of environmentally friendly energy storage systems is known as the best solution to reduce the bad effect of fossil fuels. Supercapacitors have received more attention than other energy storage devices (batteThe use of environmentally friendly energy storage sys More

The use of environmentally friendly energy storage systems is known as the best solution to reduce the bad effect of fossil fuels. Supercapacitors have received more attention than other energy storage devices (batteThe use of environmentally friendly energy storage systems is known as the best solution to reduce the fossil fuels consumption. Supercapacitors have received more attention than other energy storage devices (batteries and fuel cells) due to their high power density, high cycling stability and optimal energy density. The use of inexpensive and available electrode material is the key to the development of supercapacitors in the industrial and commercial scales. Nickel and manganese oxides have a high theoretical specific capacity, in addition to their availability and lower price. A type of morphology with many electrochemically active sites can be achieved by using these two metal oxides, together. In this research, nickel manganese oxide electrode material (NiMnO3) was synthesized using hydrothermal method. Then, the characterization tests of XRD, FT-IR and SEM were used to determine the crystallographic and morphological properties. Characterization analyses showed that the rhombohedral NiMnO3 nanoparticles with mesoporous structure were obtained. The electrochemical tests of CV, GCD and EIS showed that the NiMnO3 electrode has an excellent supercapacitive performance with the specific capacity of 444 F/g at a current density of 1 A/g. The great performance of NiMnO3 electrode can be related to the abundant and available electrochemical active sites of NiMnO3 electrode with appropriate mesoporous structure which led to the charge storage reactions. Manuscript profile

Open Access Article

45 - One-step synthesis of superparamagnetic iron oxide nanoparticles doped with zinc cations and coated with saccharides for biomedical applications
Hamze Foratirad Mustafa Aghazade

20.1001.1.24233226.1402.17.2.4.0

In this paper, three-types of metal-cations doped superparamagnetic iron oxide nanoparticles (IONs) including glucose-grafted Zn2+-doped MNPs (glucose/Zn-IONs), sucrose-grafted Zn2+-doped IONs (sucrose/Zn-IONs) and starch-grafted Zn2+-doped IONs (starch/Zn-IONs) are rep More

In this paper, three-types of metal-cations doped superparamagnetic iron oxide nanoparticles (IONs) including glucose-grafted Zn2+-doped MNPs (glucose/Zn-IONs), sucrose-grafted Zn2+-doped IONs (sucrose/Zn-IONs) and starch-grafted Zn2+-doped IONs (starch/Zn-IONs) are reported. These IONs are fabricated by OH– ions electrochemical generation through cathodic deposition method. The saccharide capped layer onto the surface of deposited IONs and also zinc cations doping into their crystal structure were confirmed via Fourier-transform infrared spectroscopy, Field-emission scanning electron microscopy and Energy Dispersive X-ray techniques. Figures of the Field-emission scanning electron microscopy showed that the morphology of particles synthesized is spherical. Analyses revealed magnetite crystal structure with about 10% doped zinc for all the prepared samples. The magnetic evaluations by sample vibrating magnetometer (VSM) technique specified the superparamagnetic behaviors for the prepared samples, where low coercivity and remanence values (i.e. Hci=8.9Oe and Mr=0.24 emu/g for glucose/Zn- IONs; Hci=3.6Oe and Mr=0.09 emu/g for sucrose/Zn- IONs; Hci=9.2Oe and Mr=0.28 emu/g for starch/Zn- IONs) were observed. Manuscript profile

Open Access Article

46 - Enhancing Electrochemical Performance of Super capacitors Electrode Using Nickel-Based Metal-Organic
Marziyeh Azadfalah Arman Sedghi Ali Mehdikhani hadi hosseini

20.1001.1.24233226.1401.16.3.5.6

Metal-organic frameworks (MOFs) have been used as electrode materials in supercapacitors (SCs) due to their high specific surface area and suitable porosity size. However, using single-component MOFs in SCs leads to poor electrical conductivity, insufficient stability, More

Metal-organic frameworks (MOFs) have been used as electrode materials in supercapacitors (SCs) due to their high specific surface area and suitable porosity size. However, using single-component MOFs in SCs leads to poor electrical conductivity, insufficient stability, and poor mechanical properties, and thwarts the effect of high capacity and efficient performance. In this paper, to improve the electron transfer rate and take advantage of the specific surface of MOFs, nickel-based metal-organic framework/graphene nanocomposites were prepared by hydrothermal in-situ synthesis, and to prevent agglomeration, graphene (0, 2.5, 5, and 10wt%) was added during the synthesis process. To characterize the structure of the nanocomposites, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM) were used. To study the supercapacitor behavior, electrochemical tests, such as cyclic voltammetry, electrochemical impedance, and repeatability behavior were used. The electrode prepared by the nickel-based MOFs in the 6M KOH electrolyte had a specific capacity of 660 F/g, while their composite with graphene had a specific capacity of 1017 F/g. As a result, benefiting from composite properties and increasing electrical conductivity of MOFs with graphene resulted in greater porosity availability and increased total storage capacity. Manuscript profile

Open Access Article

47 - Mechanical alloying and fabrication of Zn-4Mn fragments produced by SPS method for using in short-term implants
Nahid Hassanzadeh Nemati mohammad babaiee erfan chizari davood malekpajouh

20.1001.1.24233226.1401.16.4.2.5

Zn-based alloys (Zn) with control of the production process have the potential to give rise to a wide range of properties required for use in short-term implants. For this purpose, in the present study, a Zn-4wt%Mn alloy was prepared by mechanical alloying in three time More

Zn-based alloys (Zn) with control of the production process have the potential to give rise to a wide range of properties required for use in short-term implants. For this purpose, in the present study, a Zn-4wt%Mn alloy was prepared by mechanical alloying in three times of 10, 20 and 30 hours. Then some blocks were made by Spark plasma sintering (SPS) process. Heat treatment of manufactured parts was performed at three temperatures of 150, 200 and 250 ° C. The samples were characterized using XRD, dynamic polarization corrosion test and MTT cell viability evaluation. Also, the surface morphology of the samples was determined using scanning electron microscopy (SEM). The results showed that increasing the milling time to 30 hours created a more homogeneous composition, and the heat treated sample at 250 ° C had the highest corrosion resistance. Cell viability of the heat treated samples at this temperature showed higher viability than other samples. The results of this study are expected to be used in short-term implants. Manuscript profile

Open Access Article

48 - Sonochemical synthesis of Eu doped ZnS-Fe3O4 nanocomposite with improved photocalalytic performance in the remediation of dye organic pollutant
Shirin Kalantari Ali Shokuhfar

20.1001.1.24233226.1402.17.1.6.0

The purpose of this research is synthesis of nanocomposite with high photocatalyst property and magnetic separation ability in order to degradation of organic pollutants and reusability, respectively. Therefore, Eu doped ZnS - Fe3O4 nanocomposite is synthesized via sono More

The purpose of this research is synthesis of nanocomposite with high photocatalyst property and magnetic separation ability in order to degradation of organic pollutants and reusability, respectively. Therefore, Eu doped ZnS - Fe3O4 nanocomposite is synthesized via sonochemical method which this method is easy and low cost. The synthesized photocatalyst is investigated with X-ray Diffraction Pattern (XRD), Energy Dispersive X-ray Spectroscopy (EDS), Photoluminescence Spectroscopy (PL), UV-Vis Spectrophotometry. As a consequence of testing the capability of magnetic separation, the high amount of photocatalyst attracted by the magnet guarantees the property of recyclability. Photocatalytic application in presence of synthesized nanocomposite for degradation of Rhodamine-B dye under UV-C and visible lamp is studied and results showed 81% and 78% degradation efficiency under UV-C lamp for 3 hours and visible lamp for 1 hour, respectively. In addition, stability and reuse investigation showed that the nanocomposite still remains its photocatalytic capacity after 3 cycles test. Manuscript profile

Open Access Article

49 - Fabrication and Optimization of Humidity Sensor Based on Porous Nanostructure Tungsten Tri‌oxide / Silver Nanoparticles
Ayub Karimzad Ghavidel Gholamreza Kiani Mahsa Mahdavinia

20.1001.1.24233226.1402.17.1.3.7

The aim of this research is to fabricate a moisture sensor based on porous nanostructure of pure tungsten trioxide (WO3) and doped with silver nanoparticles (SN), and to use the properties of ohmic changes, capacitance and impedance versus moisture as output. The struct More

The aim of this research is to fabricate a moisture sensor based on porous nanostructure of pure tungsten trioxide (WO3) and doped with silver nanoparticles (SN), and to use the properties of ohmic changes, capacitance and impedance versus moisture as output. The structural characteristics of the prepared nanocomposite were examined by a scanning electron microscope and X-ray diffraction spectroscopy. The results showed that synthetic WO3 is in the form of spheres with dimensions of 3 to 7 μm, with a surface porous structure in size of 10 to 60 nm. To fabricate the sensors, first the materials were mixed and dispersed, then coated on the interdigitated electrode by sedimentation method. The investigation showed that the doped sensor with SN have a better performance in comparison with WO3 sample. Its sensitivity was obtained 4.4 and 0.68 MΩ/%RH for the relative humidity range of 20-50% and 50-90%, respectively, improved 7 and 5% compared to similar previous samples. The response and recovery time of this sensor was measured approximately 2 and 7 seconds, which is 37.5 and 41.4 times smaller than available samples, respectively. Decreasing the capacitance of the sensor to 3800 Pf by increasing the relative humidity to 90% is another finding. Significant impedance changes of the sensor versus the humidity alternations is other important result, showing that the impedance can be considered as a sensor output by compensating for errors of ohmic changes and capacitance. Manuscript profile

Open Access Article

50 - The effect of nanodiamond concentration on wear behavior of nickel-boron-nanodiamond composite coatings
Seyyed Saber Mirhosseini farzad mahboubi

One of the most important finishing operations that is usually performed as the final process when producing a part is the modification of surface properties with surface engineering operations. Many metals can be coated by the electroless-coating method. Electroless ni More

One of the most important finishing operations that is usually performed as the final process when producing a part is the modification of surface properties with surface engineering operations. Many metals can be coated by the electroless-coating method. Electroless nickel-boron coatings have been widely used in the industry due to their cheap price and uniform coating capability. In this article, nickel-boron-nanodiamond electroless coating with different concentrations of nanodiamond was applied on AISI 4140 steel, and its structural properties and wear behavior were investigated. The structural properties of the coatings were investigated with the help of X-ray diffraction tests, scanning electron microscopy, and hardness test. Also, the friction coefficient and wear properties of the samples were studied using the pin-on-disc test. The results show that with the increase in nanodiamond concentration, the structure of the coating changes from amorphous to semi-crystalline. In addition, the electron microscope images and the hardness test results show that adding nanodiamonds to the electroless bath increases the hardness. Adding nanodiamonds to a concentration of 0.5 g/L improved the wear resistance and reduced the friction coefficient. However, increasing the concentration of nanodiamonds up to 1 g/L due to the agglomeration of nanodiamonds caused an increase in the specific wear rate of the coating. Manuscript profile

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