Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201Magnetic Properties and Phase Transitions in a Spin-1 Random Transverse Ising Model on Simple Cubic Lattice1611663927ENH.Mohammadi KamravaDepartment or Physics, Faculty of Sciences, Shiraz University, Shiraz, I. R. IranM.BaratiDepartment or Physics, Faculty of Sciences, Shiraz University, Shiraz, I. R. IranJournal Article20111018Within the effective-field theory with correlations (EFT), a transverse random field spin-1 Ising model on the simple cubic (z=6) lattice is studied. The phase diagrams, the behavior of critical points, transverse magnetization, internal energy, magnetic specific heat are obtained numerically and discussed for different values of p the concentration of the random transverse field.https://www.ijnnonline.net/article_3927_d2dc6368837861b42020ee72b0896182.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201A Simple New Method to Synthesize Nanocrystalline Ruthenium Dioxide in the Presence of Octanoic Acid As Organic Surfactant1671723928ENM.Khorasani-MotlaghDepartment of Chemistry, University of Sistan & Baluchestan, Zahedan, I.R. IranM.NoroozifarDepartment of Chemistry, University of Sistan & Baluchestan, Zahedan, I.R. IranM.YousefiDepartment of Chemistry, University of Sistan & Baluchestan, Zahedan, I.R. IranJournal Article20111005Ruthenium dioxide nanoparticles (RuO2 ) with an average particle size of 50 nm are readily synthesized from RuCl3.xH2O via the precipitation process in the presence of in-situ sodium octanoate as anionic surfactant. The phase composition, morphology, lattice parameters and size of nanoparticles in these products are characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM).https://www.ijnnonline.net/article_3928_1597d21403f63da1bb0539592597a525.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201Transport of a Liquid Water-Methanol Mixture in a Single Wall Carbon Nanotube1731823929ENN.FarhadianChemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, I. R. IranJournal Article20110917In this work, a molecular dynamics simulation of the transport of water - methanol mixture through the single wall carbon nanotube (SWCNT) is reported. Methanol and water are selected as fluid molecules since water represents a strongly polar molecule while methanol is as an intermediate between polar and strongly polar molecules. Some physical properties of the methanol-water mixture such as radial and axial density, hydrogen bonding, number of contacts and minimum distance between mixture and SWCNT molecules and also diffusivity of the mixture as a transport property were calculated during the simulation. Results showed that mixture of the selected molecules inside SWCNT have different properties during transport along the SWCNT in comparison with pure fluids inside SWCNT. Also methanol molecules diffuse faster than water molecules inside nanotube due to a weaker hydrogen bonding network. These differences among physical properties of the fluids inside SWCNT can be a key parameter for designing the new separation equipments and sensors using SWCNT.https://www.ijnnonline.net/article_3929_79f69230354b71206fb723c571cce58b.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201Fabrication of Copper and Iron Nano/Micro Structures on Semiconducting Substrate and Their Electrical Characterization1831893930ENJ.KaurDepartment of Physics, Guru Nanak Dev University, Amritsar, IndiaS.SinghDepartment of Physics, Guru Nanak Dev University, Amritsar, IndiaR.KumarDepartment of Physics, Haryana College of Technology and Management, Kaithal, IndiaD.KanjilalIUAC New Delhi, IndiaSh.ChakarvartiManav Rachna International University(MRIU),Faridabad, IndiaJournal Article20110910In this paper, we have studied the electrical properties of the randomly distributed metallic (Co and Fe) nano/ micro wires on Silicon substrate. Deposition was carried out potentiostatically into the pores of the track-etch polycarbonate membrane spin coated onto the Si substrate. Spin coated films were irradiated with 150MeV Ni (+11) ions at a fluence of 8E7 ions/cm2, followed by UV irradiation and chemically etching in aqueous NaOH (6N, at room temperature). The size, shape and morphology of the synthesized nano/micro structures is strongly dependent on the preparation conditions such as deposition potential, current density, electrolyte and etching conditions. Later, morphological and electrical properties of the so deposited nano-/micro structureswere studied.https://www.ijnnonline.net/article_3930_679d8bbd776e0bbf3b044306c5be94ae.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201The Effects of Strained Multiple Quantum Well on the Chirped DFB-SOA All Optical Flip-Flop1901963931ENM.JabbariDepartment of Electrical Engineering, Marvdasht branch, Islamic Azad University,
Marvdasht, I. R. Iran.M. K.Moravvej-FarshiAdvanced Device Simulation Lab, Electrical and Computer Engineering Department,
Tarbiat Modares University, I. R. IranR.GhayourElectrical Engineering Department, Shiraz University, Shiraz, I. R. IranA.ZarifkarIran Telecommunication Research Center, Tehran, I. R. IranJournal Article20111101In this paper, based on the coupled-mode and carrier rate equations, a dynamic model and numerical analysis of a multi quantum well (MQW) chirped distributed feedback semiconductor optical amplifier (DFB-SOA) all-optical flip-flop is precisely derived. We have analyzed the effects of strains of QW and MQW and cross phase modulation (XPM) on the dynamic response, and rise and fall times of the DFB-SOA all optical flip flop. We have shown that strained MQW active region under an optimized condition into a DFB-SOA with chirped grating can improve the switching ON speed limitation in the abovementioned device, significantly while the fall time is increased. The values of the rise times for such an all optical flip-flop, are obtained in an optimized condition, areas tr=255ps.https://www.ijnnonline.net/article_3931_acff1af62d0f91f4be73f4857552d70c.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201Magnetic iron oxide nanoparticles, Polyethylene glycol, Surfactant, Superparamagnetic, Chemical co-precipitation1972003932ENZ.Khayat SarkarKimiya Pajooh Afagh-e- Kavir Research & Technology Company, Yazd, I. R. IranF.Khayat SarkarKimiya Pajooh Afagh-e- Kavir Research & Technology Company, Yazd, I. R. IranJournal Article20111008In this study, magnetic iron oxide nanoparticles (Fe3O4) with the size range of 20-30 nm were prepared by the modified controlled chemical co-precipitation method from the solution of ferrous/ferric mixed salt-solution in alkaline medium. In this process polyethylene glycol was used as a surfactant to prevent the solution from agglomeration. The prepared magnetic nanoparticles were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and vibrating-sample magnetometer (VSM). XRD image indicates the sole existence of inverse cubic spinel phase of magnetic iron oxide nanoparticles (Fe3O4). SEM image show that the dimension of magnetic iron oxide nanoparticles (Fe3O4) is about 24 nm. VSM patterns demonstrate superparamagnetic properties of magnetic nanoparticles.https://www.ijnnonline.net/article_3932_c56a022b15250525f8b9bdfc41a13152.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-70047420111201I-V Characteristics of a Molecular Wire of Polyaniline (Emeraldine Base)2012043933ENH.Milani MoghaddamSolid State Physics Department, University of Mazandaran, Babolsar, I. R. Iran
Molecular Electronics Lab., University of Mazandaran, Babolsar, I. R. IranJournal Article20110811In this study, Polyaniline molecule (emeraldine base) is modeled as a molecular wire and the effects of the metal/molecule coupling strength and the molecule length on the current-voltage (I-V) characteristics are numerically investigated. Using a tight-binding Hamiltonian model, the methods based on Non-equilibrium Green’s function theory, Landauer formalism and Newns-Anderson model, our calculations indicate that the I-V curve has the step-like form and the current is very sensitive to the metal/molecule coupling strength. A negative differential resistance region is also exhibited after second voltage step in the I-V curves and the line slope at that region is studied as a function of two parameters, which are the metal/molecule coupling strength and the molecule length.https://www.ijnnonline.net/article_3933_298f587406c914fad5373bb689300433.pdf