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Excellent photocatalytic performance under visible-light irradiation of ZnS/rGO nanocomposites synthesized by a green method

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Frontiers of Materials Science 2016年第4期10卷 385-393页

作者： Hassan Rayat AZIMI Mahmood GHORANNEVISS Seyed mohammad ELAHI mohammad Reza MAHMOUDIAN farid jamali-SHEINI Ramin YOUSEFI Plasma Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran Department of Chemistry Shahid Sherafat University of Farhangian 15916 Tehran Iran Advanced Surface Engineering and Nano Materials Research Center Department of Physics Ahvaz Branch Islamic Azad University Ahvaz Iran Department of Physics Masjed-Soleiman Branch isiamic Azad University Masjed-Soleiman Iran

ZnS/graphene nanocomposites with different graphene concentrations （5, 10 and 15 wt.%） were synthesized using L-cysteine as surfactant and graphene oxide （GO） powders as graphene source. Excellent performance for nanocomposites to remove methylene blue （MB） dye and hexavalent chromium （Cr（VI）） under visible-light illumina- tion was revealed. TEM images showed that ZnS NPs were decorated on GO sheets and the GO caused a significant decrease in the ZnS diameter size. XRD patterns, XPS and FTIR spectroscopy results indicated that GO sheets changed into reduced graphene oxide （rGO） during the synthesis process. Photocurrent measurements under a visible- light source indicated a good chemical reaction between ZnS NPs and rGO sheets.

关键词： ZnS/rGO nanocomposites graphene photocatalytic performance watertreatment green nanotechnology

Influence of growth conditions on the electrochemical synthesis of SnS thin films and their optical properties

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International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 348-357页

作者： Hosein Kafashan farid jamali-Sheini Reza Ebrahimi-Kahrizsangi Ramin Yousefi Advanced Materials Research Center Materials Engineering DepartmentNajafabad BranchIslamic Azad UniversityNajafabadIsfahanIran Department of Physics Ahvaz BranchIslamic Azad UniversityAhvazIran Department of Physics Masjed-Soleiman BranchIslamic Azad University(I.A.U)Masjed-SoleimanIran

Tin sulfide （SnS） thin films were prepared by electrodeposition onto fluorine-doped tin oxide （FTO） glass substrates using an aqueous solution containing SnCl2 and Na2S2O3 at various deposition potentials （L） and bath concentrations. The pH value and temperature of the solution were kept constant. The deposited films were characterized using X-ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, photoluminescence （PL）, and ultraviolet-visible （UV-Vis） spectroscopy. The FESEM images demonstrated that changes in the deposition potential （E） and solution concentration led to marked changes in the morphology of the deposited SnS films. Energy-dispersive X-ray analysis （EDXA） results showed that the SrdS atomic ratio strongly depended on both the solution concentration and the deposition potential. To obtain an SrdS atomic ratio approximately equal to l, the optimal Sn2＋/S2O2- 3 molar ratio and E parameter were 1/8 and -1.0 V, respectively. The XRD patterns showed that the synthesized SnS was obviously polycrystalline, with an orthorhombic structure. The effects of the variations of bath concentration and deposition potential on the band-gap energy （Eg） were studied using PL and UV-Vis experiments. The PL spectra of all the SnS films contained two peaks in the visible region and one peak in the infrared （IR） region. The UV-Vis spectra showed that the optical band-gap energy varies from 1.21 to 1.44 eV.

关键词： tin sulfide thin films electrodeposition structural properties optical properties

Electroplating of Ni/Co–pumice multilayer nanocomposite coatings: Effect of current density on crystal texture transformations and corrosion behavior

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International Journal of Minerals,Metallurgy and Materials 2019年第10期26卷 1299-1310页

作者： Mehdi Boroujerdnia Hamid Ghayour Ahmad Monshi Reza Ebrahimi-Kahrizsangi farid jamali-Sheini Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Advanced Surface Engineering and Nano Materials Research Center Department of PhysicsAhvaz BranchIslamic Azad UniversityAhvazIran

The present paper aims to investigate the influence of the current density in the electroplating process on the microstructure, crystal texture transformations, and corrosion behavior of Ni/Co pumice multilayer nanocomposite coatings. The Ni/Co pumice composite coatings were prepared by deposition of Ni, followed by the simultaneous deposition of pumice nanoparticles (NPs) in a Co matrix via an electroplating process at various current densities. Afterward, the morphology, size, topography, and crystal texture of the obtained samples were investigated. Furthermore, electrochemical methods were used to investigate the corrosion behavior of the produced coatings in a solution of 3.5wt% NaCl. The results indicated that increasing the plating current density changed the mechanism of coating growth from the cell state to the column state, in- creased the coating thickness, roughness, and texture coefficient (TC) of the Co (203) plane, and reduced the amount of pumice NPs incorporated into the Ni/Co pumice composite. The electrochemical results also indicated that increasing the current density enhanced the corrosion resistance of the Ni/Co pumice composite.

关键词： electroplating current density Ni/Co pumice corrosion resistance crystal texture of coating

Ultrasonic synthesis of Zn-doped CdO nanostructures and their optoelectronic properties

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2256-2265页

作者： Milad KAVAKEBI farid jamali-SHEINI Department of Materials Science and Engineering Ahvaz BranchIslamic Azad UniversityAhvazIran Advanced Surface Engineering and Nano Materials Research Center Department of PhysicsAhvaz BranchIslamic Azad UniversityAhvazIran

The effect of Zn dopant on the growth of cadmium oxide （CdO） nanostructures through a sonochemical method wasinvestigated. The X-ray diffraction （XRD） patterns of the nanoparticles show CdO cubic structures for the produced samples. Fieldemission scanning electron microscope （FESEM） images reveal that morphologies of the samples change, when they are doped withZn atoms, and their sizes reduce. Room temperature photoluminescence （PL） and UV-Vis spectrometers were used to study opticalproperties of the samples. Evaluation of optical properties indicates that different emission bands result from different transitions andthe value of CdO energy band gap increases due to doping. Studies of electrical properties of the nanostructures demonstrate that Zndopant enhances electrical conductivity and photocurrent generation as the result of light illumination on the nanostructures due toimproved density of photo-generated carriers. Considering the obtained outcomes, Zn dopant can alter the physical property of theCdO nanostructures.

关键词： Zn-doped CdO nanostructures ultrasonication method optical properties electrical properties

Influences of anionic and cationic dopants on the morphology and optical properties of PbS nanostructures

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Chinese Physics B 2014年第10期23卷 566-572页

作者： Ramin Yousefi Mohsen Cheragizade farid jamali-Sheini M. R. Mahmoudian Abdolhossein Saaédi Nay Ming Huang Depertment of Physics Masjed-Soleiman Branch Islamic Azad University (I.A.U.) Masjed-Soleiman Iran Department of Electrical Engineering Bushehr Branch Islamic Azad University (I.A.U.) Bushehr Iran Department of Physics Ahwaz Branch Islamic Azad University Ahwaz Iran Department of Chemistry Shahid Sherafat University of Farhangian 15916 Tehran Iran Low Dimensional Materials Research Center Department of Physics Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia

Selenium and zinc are used as anionic and cationic dopant elements to dope PbS nanostructures. The undoped and doped PbS nanostructures are grown using a thermal evaporation method. Scanning electron microscopy （SEM） results show similar morphologies for the undoped and doped PbS nanostructures. X-ray diffraction （XRD） patterns of three sets of the nanostructures indicate that these nanostructures each have a PbS structure with a cubic phase. Evidence of dopant incorporation is demonstrated by X-ray photoelectron spectroscopy （XPS）. Raman spectra of the synthesized samples con- firm the XRD results and indicate five Raman active modes, which relate to the PbS cubic phase for all the nanostructures. Room temperature photoluminescence （PL） and UV-Vis spectrometers are used to study optical properties of the undoped and doped PbS nanostructures. Optical characterization shows that emission and absorption peaks are in the infrared （IR） region of the electromagnetic spectrum for all PbS nanostructures. In addition, the optical studies of the doped PbS nanos- tructures reveal that the band gap of the Se-doped PbS is smaller, and the band gap of the Zn-doped PbS is bigger than the band gap of the undoped PbS nanostructures.

关键词： PbS nanostructures anionic dopant cationic dopant thermal evaporation optical properties

A drospirenone-containing oral contraceptive improved bleeding pattern and personal satisfaction in 914 women from Jordan, Lebanon and Syria

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Health 2013年第7期5卷 39-44页

作者： Ramzi Finan Abeer Wasfi Annab Salwa Abdalla farid Bedran Mazen El-Zibdeh Lina Shahen Christoph Gerlinger Erich Solomayer Kubilay Ertan Jan Endrikat Universite St.Joseph Hotel Dieu de FranceBeirutLebanon 2.Al Amal Maternity HospitalAmmanJordan 3.Private Clinic—Al-ShahBandar SquareDamascusSyria 4.Serhal Hospital-RabiehBeirutLebanon 5.Islamic HospitalAmmanJordan 6.Private Clinic—Al-Enshaat-Ragheb Al-Jamali StreetHomsSyria 7.Bayer HealtcareBayer AGBerlinGermany Department of OB/GYN Universitatskliniken des SaarlandesHomburg/SaarGermany 9.Department of OB/GYNLeverkusen Municipal HospitalLeverkusenGermany

Aim: We assessed bleeding pattern, tolerance and patient satisfaction of an oral contraceptive containing 3 mg drospirenone and 30 mcg ethinyl estradiol (DRSP/EE) under real-life conditions. Study Design: We performed a multicenter, prospective, 6-cycle, observational study in Canada, Europe and the Middle East. Detailed analyses of the three Middle East countries, Jordan, Lebanon andSyriawere presented here. The efficacy variables included an assessment of bleeding patterns, premenstrual symptoms of water retention and patient satisfaction, as determined by a visual analogue scale. Results: A total of 914 women were enrolled. The percentage of women with intermenstrual bleeding decreased from 37.4%, 48.7% and 32.2% at baseline to 9.7%, 6.1% and 10.9% at the end of cycle6 inJordan, Lebanon and Syria, respectively (creased sharply in all three countries (p Amenorrhea decreased significantly in Lebanon and Syria (p < 0.005). In addition, signs of water retention like abdominal bloating, breast tenderness and swelling of extremities decreased significantly over the course of 6 treatment cycles (p < 0.001). Patient satisfaction increased for all investigated items. Upon completion of the study, 82.7% of women answered “Yes” to continue treatment with this oral contraceptive. Conclusion: The oral contraceptive containing 3 mg drospirenone and 30 mcg ethinyl estradiol has beneficial effects on bleeding pattern, symptoms of water retention and patient satisfaction.

关键词： Bleeding Pattern Tolerance Drospirenone Oral Contraception