Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Synthesis of Three-Layered Magnetic Based Nanostructure for Clinical Application57643941ENM. E. KhosroshahiLaser and Nanobiophotonic Lab., Biomaterials Group, Faculty of Biomed. Eng., Amir Kabir University of Technology, Tehran, I.R. IranL. GhazanfariLaser and Nanobiophotonic Lab., Biomaterials Group, Faculty of Biomed. Eng., Amir Kabir University of Technology, Tehran, I.R. IranJournal Article20110510The main objective of this research was to synthesize and characterize gold-coated Fe3O4 /SiO2 nanoshells for clinical applications. Magnetite nanoparticles (NPs) were prepared via co-precipitation. The results showed that smaller particles can be synthesized by decreasing the NaOH concentration, which in our case this corresponded to 35 nm by using 0.9 M of NaOH at 750 rpm. The NPs were then modified with a thin layer of silica using Stober method. The surface of Fe3O4 /SiO2 nanoshells was then terminated with amine groups with 3-aminopropyltriethoxysilane (APTS) in ethanol. Small gold colloid (1-3 nm) were adsorbed on the particle surface via the interaction between the negative charge on the Au nanoparticles and the positive charge of -NH3 on the SiO2 shell modified by APTS. Gold nanoshell formation, morphology and dimensions were assessed with a UV-Vis spectrophotometer, atomic force microscope (AFM), and transmission electron microscope (TEM). The synthesized nanostructures exhibited an absorption peak at ~550 nm with a magnetization value of 1.3 emu/g. Based on the X-ray diffraction (XRD) results, three main peaks of Au were identified. The formation of each layer of a nanoshell is also demonstrated by Fourier transform infrared (FTIR) results.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Electronic Properties of a Concentric Triple Quantum Nanoring65713942ENH. K. SalehaniPlasma Physics Research Center, Science and Research Branch, Islamic Azad University,
Tehran, I.R. IranM. EsmaeilzadehDepartment of Physics, Iran University of Science and Technology, Tehran, I.R. IranKh. ShakouriDepartment of Physics, Iran University of Science and Technology, Tehran, I.R. IranM. R. AbolhassaniPlasma Physics Research Center, Science and Research Branch, Islamic Azad University,
Tehran, I.R. IranE. FaizabadiDepartment of Physics, Iran University of Science and Technology, Tehran, I.R. IranM. H. MajlesaraDepartment of Physics, Faculty of Science, Tarbiat Moallem University, Tehran, I.R. IranJournal Article20110105In this paper, we study the electronic properties of a concentric triple quantum ring using exact diagonalization technique. The energy spectra and magnetization for a single electron and two electrons, in the presence of an applied magnetic field, are calculated and discussed. It is shown that, for two-interacting electrons, the period of Aharonov-Bohm oscillations decreases to the half of that for non-interacting electrons which shows the fractional Aharonov-Bohm oscillations for interacting electrons. It is found that the spin-singlet state for two electrons is more stable than the spin-triplet states. Also, magnetization effect decreases due to the electronelectron interaction.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Multilayer Nano Films for Corrosion Control72773943ENS. SabbaghiNano Chem. Eng. Dep., Faculty of Nanotechnology, Shiraz University, Shiraz, I.R. IranR. Bazargan LariNanotechnology Research Institute, Shiraz University, Shiraz, I.R. IranM. ZeraatkarIranian Oil Terminal Company, Khark, I.R. IranJournal Article20110315Nano films consisting of an alternating sequence of positively and negatively charged polyelectrolytes have been prepared by means of the electrostatic layer-by-layer (LBL) sequential assembly technique on treated and untreated mild steel wires. Inhibitor was encapsulated between cationic and anionic polyelectrolyte nano films. This paper mainly focuses on the effect of these nano-films of polyelectrolytes with different functional groups on corrosion protection. Weight loss method was used for measuring the corrosion rate of coated and uncoated mild steel substrate. Scanning Tunneling Microscope (STM) and Scanning Electron Microscope (SEM) were used for monitoring the surface morphology of the obtained nano films. Finally, the best efficiency was realized with 40 layers deposited on treated mild steel in the presence of 1mM benzotriazole inhibitor.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Formic Acid Decomposition Using Synthesized Ag/TiO2 Nanocomposite in Ethanol-Water Media Under Illumination of Near UV Light78863944ENE. PipelzadehChemical engineering department, Sahand University of Technology, Tabriz, I.R. Iran
Nanostructure material research center (NMRC), Sahand University of Technology, Tabriz, I.R. IranM. Valizadeh DerakhshanChemical engineering department, Sahand University of Technology, Tabriz, I.R. Iran
Nanostructure material research center (NMRC), Sahand University of Technology, Tabriz, I.R. IranA. A. BabaluoChemical engineering department, Sahand University of Technology, Tabriz, I.R. Iran
Nanostructure material research center (NMRC), Sahand University of Technology, Tabriz, I.R. IranM. HaghighiChemical engineering department, Sahand University of Technology, Tabriz, I.R. Iran
Nanostructure material research center (NMRC), Sahand University of Technology, Tabriz, I.R. IranA. TavakoliChemical engineering department, Sahand University of Technology, Tabriz, I.R. Iran
Nanostructure material research center (NMRC), Sahand University of Technology, Tabriz, I.R. IranJournal Article20110110The effect of ethanol-water media on the synthesis of Ag/TiO2 nanocomposite was investigated with 0.05, 0.1 and 0.5 (wt.%) of Ag content. Ethanol was used as hole-scavenger enhancing the photodecomposition of Ag+ ions under illumination of near-UV light. The nanocomposites were further calcined to 300˚C and 400˚C under controlled atmosphere. The synthesized nanocomposites were tested for photocatalytic efficiency decomposing formic acid as an organic pollutant under irradiation of a 4W near UV lamp with lmax at 365nm and the results were compared with that of non-modified commercially available Degussa TiO2 (P25). The synthesized nanocomposites were characterized using XRD and SEM micrographs. The photocatalytic studies have revealed a constant overall performance for all synthesized nanocomposites. The initial rate of decomposition was observed to increase with decreasing Ag content, in the case of 0.05 wt.% having the best initial rate. Calcination of the nanocomposites was found to have activating properties on the synthesized nanocomposites where nanocomposite with 0.05 (wt.%) Ag content calcined at 300°C was distinctively advantageous overother calcined nanocomposites.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Application of Molybdophosphoric Acid as Reducing Agent/ Stabilizer in the Synthesis of Gold Nanoparticles under UV Irradiation87933945ENA. AyatiDepartment of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. Iran.A. AhmadpourDepartment of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. Iran.F. F. BamoharramDepartment of Chemistry, School of Sciences, Mashhad Branch, Islamic Azad University,
Mashhad, I.R. Iran.M. M . HeraviDepartment of Chemistry, School of Sciences, Alzahra University, Tehran, I.R. IranH. RashidiDepartment of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. Iran.B. TanhaeiDepartment of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. Iran.Journal Article20110308In this paper, we have described the size-controlled synthesis of gold nanoparticles based on the reduction of Au3+ (HAuCl4 ) using molybdophosphoric acid (H3[PMo12O40 ], HPMo) under UV-irradiation. In the process, HPMo plays the role of photocatalyst, reducing agent and stabilizer and propan-2-ol acts as a sacrificial agent. This method allows the synthesis of uniform hexagonal nanoparticles with an average size that is tunable between 1.93 and 119 nm by varying the gold ion concentration, HPMo dose (or molar ratio of gold ion to HPMo) and Propan-2-ol amount. We have found that there is a critical ratio for [Au3+]/[HPMo], in which two opposing trends in the size of gold nanoparticles would happened.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Simple and Low Temperature Method for Preparation of Nanocrystalline ZnO in Presence of [EMIM][EtSO4] and Their Photocatalytic Activities941013946ENV. TaghvaeiDepartment of Chemistry, University of Mohaghegh Ardabili, Ardabil, I.R. IranA. Habibi-YangjehDepartment of Chemistry, University of Mohaghegh Ardabili, Ardabil, I.R. Iran.M. BehboudniaDepartment of Physics, Urmia University of Technology, Urmia, I.R. IranJournal Article20110202Simple, low temperature and environmentally benign green route is proposed for preparation of nanocrystalline ZnO in presence of a low-cost and halide-free room-temperature ionic liquid (RTIL) by refluxing at 95 °C for 60 minutes. The X-ray diffraction (XRD) studies display that the products are well-crystallized in the form of wurtzite hexagonal. Morphology of the as-prepared ZnO was characterized by scanning electron microscopy (SEM) and the results demonstrate that the prepared nanocrystalline ZnO in presence of the RTIL is smaller than that of prepared in water. Energy dispersive X-ray spectroscopy (EDX) investigations reveal that the products are extremely pure. Diffuse reflectance spectra (DRS) of the prepared sample in the neat RTIL shows blue shift (0.33 eV) relative to the bulk ZnO that can be attributed to quantum confinement effect of nanocrystalline ZnO. Investigation of photocatalytic degradation of methylene blue (MB) on the prepared samples demonstrates that rate constant of the reaction increases with the RTIL content of the media.Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047220110601Intracellular Biosynthesis of Gold Nanoparticles by the Fungus Penicillium Chrysogenum1021053947ENZ. SheikhlooDepartment of Microbiology, Faculty of Sciences, Zanjan Branch, Islamic Azad University, Zanjan, I.R. IranM. SaloutiDepartment of Microbiology, Faculty of Sciences, Zanjan Branch, Islamic Azad University, Zanjan, I.R. IranJournal Article20110212In this study, the biosynthesis of gold nanoparticles by Penicillium chrysogenum, isolated from Ahar copper mine, was investigated. The gold nanoparticles were synthesized by reducing the aqueous gold ions using the culture supernatant of the filamentous fungi. The UV–vis spectrum displayed a characteristic peak at 532 nm that is very specific for gold nanoparticles. The XRD spectrum confirmed the presence of crystalline gold nanoparticles. Transmission electron microscopy exhibited the intracellular formation of gold nanoparticles in spherical, triangle and rod shapes with the size range of 5 to 100 nm.