University of KashanJournal of Nanostructures2251-78712420121201Surveying and Comparing Thermal Conductivity and Physical Properties of Oil Base NanoFluids Containing Carbon and Metal Oxide Nanotubes405412541110.7508/jns.2012.04.001ENH.AhmadiSchool a Department of Mechanical Engineering of Agricultural Machinery, University of Tehran, Karaj, Iran.E.EttefaghiSchool a Department of Mechanical Engineering of Agricultural Machinery, University of Tehran, Karaj, Iran.A. M.RashidiNanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), Tehran, Iran.S. S.MohtasebiSchool a Department of Mechanical Engineering of Agricultural Machinery, University of Tehran, Karaj, Iran.A.NouralishahiCatalysis and Nanostructured Materials Research Laboratory, School of Chemical Engineering, University of
Tehran, Tehran, IranJournal Article20140514In this research, nano materials with tubular structures are added to SAE 20W50 engine oil to study the rate of their effects on the properties of engine oil. Multi-walled carbon nanotubes (MWCNTs) and vanadium oxide nanotubes (VONTs) has been used as two different additive materials, one of them is carbonic and the other is metallic oxides and their effect on different parameters containing viscosity, thermal conductivity coefficient, flash point and pour point of engine oil as the quality properties of engine oil has been studied and compared. The samples of two concentrations 0.1 and 0.2 wt% with using planetary ball mill were made. The obtained results show that MWCNTs in all cases, which have been evaluated, had better functionality with respect to vanadium oxide nanotubes. In the 0.1 wt% concentration, flash point of MWCNTs/oil and VONTs/oil increased about 9.3% and 5.8% respectively. In addition, thermal conductivity of them increased 13.2% and 10.2% respectively.https://jns.kashanu.ac.ir/article_5411_989d5cc9e3e1a0d92f8e60ed2047aaaa.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Synthesize of Superparamagnetic Zinc Ferrite Nanoparticles at Room Temperature413416541210.7508/jns.2012.04.002ENR.Raeisi ShahrakiCenter of Excellence for Magnetic Materials, School of Metallurgy and Materials, University of Tehran, Tehran,
Iran.M.EbrahimiCenter of Excellence for Magnetic Materials, School of Metallurgy and Materials, University of Tehran, Tehran,
Iran.Journal Article20140514Superparamagnetic single phase zinc ferrite nanoparticles have been prepared by coprecipitation method at 20 °C without any subsequent calcination. The composition, crystallite size, microstructure and magnetic properties of the prepared nanoparticles were investigated using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Fourier transmission infrared spectrum (FTIR) and vibrating sample magnetometer (VSM). The XRD pattern proved that the nanoparticles were single phase cubic spinel ZnFe2O4 with crystallite size of 5nm. The magnetic measurement showed that the as-prepared nanoparticles of zinc ferrite were superparamagnet at room temperature.https://jns.kashanu.ac.ir/article_5412_7b2b5bfaeda3a08a324e16492a8a4fd2.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Selective Magnetic Removal of Pb(II) from Aqueous Solution by Porphyrin Linked-Magnetic Nanoparticles417426541310.7508/jns.2012.04.003ENH.GhanbarnejadResearch institute of petroleum industry, P.O. Box 14665-137, Tehran, IranT.PoursaberiResearch institute of petroleum industry, P.O. Box 14665-137, Tehran, IranV.AkbarResearch institute of petroleum industry, P.O. Box 14665-137, Tehran, IranJournal Article20140514The discharge of lead containing effluents into the environment and water bodies is harmful for the human, animals, aquatic flora and fauna. Herein, a novel surface engineered magnetic nanoparticle for removing Pb2+ ions was studied. After surface modification of the magnetite by 3-amino-propyltriethoxysilane (APTES) magnetic nanoparticles with covalently linked porphyrins were synthesized. Two atropisomers of meso-tetrakis(2-carboxy-4-nonylphenyl) porphyrin (TCNP) were tested to analyze the atropisomeric effect on lead uptake. For characterize the synthesized nanosorbents methods like: Transform Infrared Spectroscopy, X-ray diffraction, Transmission Electron Microscopy and Thermo-Gravimetric Analysis were used. The effects of pH, contact time, sorbent dosage and some co-existing cations were investigated. Regeneration of lead adsorbed material could be possible and the modified magnetic nanoparticles exhibited good reusability. The use of such a system can provide fast and efficient removal of the lead ion by using an external magnetic field. The competitive adsorption tests showed good adsorption selectivity for lead ion.https://jns.kashanu.ac.ir/article_5413_96d381283174d3bbce01c5a479b0f924.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Synthesis of Polypyrrole Coated SnO2-ZnO Electrospun Nanofibers via Vapor Phase Polymerization Method427432541410.7508/jns.2012.04.004ENH. A.KhoramiDivision of Nanotechnology and Advanced Materials, Materials & Energy Research CenterM.Keyanpour-RadDivision of Nanotechnology and Advanced Materials, Materials & Energy Research CenterA.EghbaliDivision of Nanotechnology and Advanced Materials, Materials & Energy Research CenterM. R.VaeziDivision of Nanotechnology and Advanced Materials, Materials & Energy Research CenterJournal Article20140514This paper reports the synthesis of polypyrrole coated SnO2/ZnOelectrospunnanofibers via vapor phase polymerization method. In order to prepare one dimensional (SnO2- ZnO)/polypyrrole with the core sheath structure, first SnO2-ZnO composite nanofibers were synthesized via electrospinning method followed by adsorption of Fe 3+ on the surface of the SnO2-ZnO nanofibers and finally pyrrole was polymerized on the surface of the fibers. The results of simultaneous thermal analysis (STA), X- ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of the nanofibers confirmed the success of synthesis of (SnO2-ZnO)/polypyrrole core sheath compound.https://jns.kashanu.ac.ir/article_5414_ef042736f1c043d674e5a51630d0c34e.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Nano-Silica Phosphoric Acid: An Efficient Catalyst for One-Pot Synthesis of Tetrahydrobenzo[a]xanthenes-11-one Under Solvent- Free or Sonication Conditions433439541510.7508/jns.2012.04.005ENA.BamoniriDepartment of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. IranS.NazemianDepartment of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. IranB. F.MirjaliliDepartment of Chemistry, College of Science, Yazd University, Yazd, PO Box 89195-741, I. R. IranJournal Article20140514Two simple protocols for the synthesis of tetrahydrobenzo[a]xanthenes-11-ones using nano silica phosphoric acid are reported. Short reaction times, high yields, reusability of catalyst and easy workup are some advantages of these protocols.https://jns.kashanu.ac.ir/article_5415_d72cd02943306f494fdfa4a3d7ec9bbf.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Preparation and Application of MnO2 Nanoparticles/Zeolite AgY Composite Catalyst by Confined Space Synthesis (CSS) Method for the Desulfurization and Elimination of SP and OPP441455541610.7508/jns.2012.04.006ENM.SadeghiDepartment of Chemistry, Faculty of Sciences, Imam Hossein University, Tehran, IranM. H.HosseiniDepartment of Chemistry, Faculty of Sciences, Imam Hossein University, Tehran, Iran
b
Nano Center Research, Imam Hossein University, Tehran, IranJournal Article20140514In this work, zeolite NaY was prepared by hydrothermal method. Then, silver ions were replaced in the zeolite NaY with silver nitrate (AgNO3) solution via using ion exchange (IE) method. The Manganese dioxide (MnO2) nanoparticles (9.3 and 15.8 wt %) for guest were deposited in the zeolite AgY(host) structure with Mn(NO3)2 aqueous and KMnO4 solutions by confined space synthesis (CSS) method. Synthesized samples were studied and characterized via XRD, SEM/EDAX, FTIR, AAS and N2-BET techniques. The desulfurization and elimination reaction of 2- chloroethyl phenyl sulfide (2-CEPS) and DEPPT (O, S-diethyl phenyl phosphonothioate) have been investigated by 15.8 wt% Nano MnO2/Zeolite AgY composite and MnO2 nanoparticles catalysts and via GC, GC-MS and 31 PNMR.https://jns.kashanu.ac.ir/article_5416_fff10a92552f74df60b7065d6c0839a6.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Effect of Calcination Temperature on the Alumina-Zirconia Nanostructures Prepared by Combustion Synthesis457461541710.7508/jns.2012.04.007ENM.Jafar TafreshiFaculty of physics, University of Semnan, Semnan, IranM.FazliFaculty of chemistry, University of Semnan, Semnan, IranZ.Jafari AyoubFaculty of physics, University of Semnan, Semnan, IranJournal Article20140514In this research, a sol gel autocaombustion route has been proposed to synthesize alumina-zirconia composite powders, using ammonium bicarbonate as a new fuel. Then the effect of calcination temperature on phase transformation and crystallite sizes was investigated. To characterize the products XRD, TEM and BET analyses were used. XRD patterns of as-synthesized powder and calcined powders at 1100 ◦C and 1200 ◦C showed t-ZrO2 phase with small crystallite sizes (sintered at 1300 ◦C and the particle sizes after calcination were 14.90 nm and 50 nm for ZrO2 and Al2O3 phases, respectively as calculated from XRD and the transformation of t-ZrO2 to m-ZrO2 started at 1300 ◦C. TEM micrograph of as-synthesized powder revealed nanosize spherical particles of about 8 nm.https://jns.kashanu.ac.ir/article_5417_d04597196df4768870d4ebcfc142189a.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Studies on Thermal Decomposition of Aluminium Sulfate to Produce Alumina Nano Structure463468541810.7508/jns.2012.04.008ENM.Jafar-Tafreshi,
Faculty of Physics, Semnan University, Iran, SemnanF.Bustanafruz,
Faculty of Physics, Semnan University, Iran, SemnanM.FazliFaculty of Chemistry, Semnan University, Iran, SemnanJournal Article20140514Aluminum sulfate nano structures have been prepared by solution combustion synthesis using aluminum nitrate nonahydrate (Al(NO3)3.9H2O) and ammonium sulfate ((NH4)2SO4). The resultant aluminum sulfate nano structures were calcined at different temperatures to study thermal decomposition of aluminum sulfate. The crystallinity and phase of the as-synthesized and calcined samples were characterized by both X- ray diffraction and FTIR measurements. These two analyses determined the temperature at which the aluminum sulfate is converted to γ-alumina nano particles. The specific surface area and pore size distribution for γ-alumina nano particles were determined by BET measurement. TEM measurement confirmed the size of the particles obtained by XRD and BET analyses.https://jns.kashanu.ac.ir/article_5418_7f84b8a40337d82f10eda2ef55fba4a7.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Improving Gas Sensing Properties of Tin Oxide Nanowires Palladium-Coated Using a Low Cost Technique469476541910.7508/jns.2012.04.009ENM.BarzegarDepartment of Physics, Shahrood University of Technology, Shahrood, 3619995161, IranM. B.RahmaniDepartment of Physics, Shahrood University of Technology, Shahrood, 3619995161, IranH.HaratizadehDepartment of Physics, Shahrood University of Technology, Shahrood, 3619995161, IranJournal Article20140514Thin films of SnO2 nanowires were successfully prepared by using chemical vapor deposition (CVD) process on quartz substrates. Afterwards, a thin layer of palladium (Pd) as a catalyst was coated on top of nanowires. For the deposition of Pd, a simple and low cost technique of spray pyrolysis was employed, which caused an intensive enhancement on the sensing response of fabricated sensors. Prepared sensor devices were exposed to liquid petroleum gas (LPG) and vapor of ethanol (C2H5OH). Results indicate that SnO2 nanowires sensors coated with Pd as a catalyst show decreasing in response time (~40s) to 1000ppm of LPG at a relatively low operating temperature (200o C). SnO2 /Pd nanowire devices show gas sensing response time and recovery time as short as 50s and 10s respectively with a high sensitivity value of ~120 for C2H5OH, that is remarkable in comparison with other reports. https://jns.kashanu.ac.ir/article_5419_74ddda505d69509e7e550f91618003bc.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Impact of Silicon Wafer Orientation on the Performance of Metal Source/Drain MOSFET in Nanoscale Regime: a Numerical Study477483542010.7508/jns.2012.04.010ENZ.AhangariDepartment of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, IranM.FathipourSchool of Electrical and Computer Engineering University of Tehran, TehranJournal Article20140514A comprehensive study of Schottky barrier MOSFET (SBMOSFET) scaling issue is performed to determine the role of wafer orientation and structural parameters on the performance of this device within Non-equilibrium Green's Function formalism. Quantum confinement increases the effective Schottky barrier height (SBH). (100) orientation provides lower effective Schottky barrier height in comparison with (110) and (111) wafers. As the channel length of ultra thin body SBMOSFET scales down to nanoscale regime, especially for high effective SBHs, quantum confinement is created along the channel and current propagates through discrete resonance states. We have studied the possibility of resonant tunneling in SBMOSFET. Resonant tunneling for (110) and (111) orientations appear at higher gate voltages.https://jns.kashanu.ac.ir/article_5420_9e9d3bd5833c7e84bb8c8f51338d52f5.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201The Investigation of a Linear-Dendrite Copolymeric Nanoparticles As Drug Carriers: ONIOM Study485488542110.7508/jns.2012.04.011ENM.OftadehChemistry Department, Payame Noor University, 19395-4697, Tehran, I. R. of IRANN.Madadi MahaniChemistry Department, Payame Noor University, 19395-4697, Tehran, I. R. of IRANR.Bahjatmanesh ArdakaniChemistry Department, Payame Noor University, 19395-4697, Tehran, I. R. of IRANJournal Article20140514Linear–dendrite copolymers containing hyper branched poly(citric acid) and linear poly(ethylene glycol) blocks PCA–PEG–PCA are promising nonmaterial to use in nanomedicine. To investigate their potential application in biological systems (especially for drug carries) ONIOM2 calculations were applied to study the nature of particular interactions between drug and the polymeric nanoparticles. Binding energy (BE) and interaction energy (IE) analysis of these complexes allowed the fundamental features of the drug- the Linear– dendritic copolymers interactions to be assessed based on ONIOM method. The results show that they have weak interaction and these complexes have relatively low stability and so PCA-PEG-PCA copolymers can use to as drug delivery.https://jns.kashanu.ac.ir/article_5421_8856b310b246e45d7d9a4cd6c52487d0.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Convenient One-Pot Synthesis of Spirooxindole-4H-pyrans in the Presence of SBA-Pr-NH2 and Evaluation of their Urease Inhibitory Activities489500542210.7508/jns.2012.04.012ENG.Mohammadi ZiaraniDepartment of Chemistry, Alzahra University, Tehran, IranN.Hosseini MohtashamDepartment of Chemistry, Alzahra University, Tehran, IranN.Lashgaria
Department of Chemistry, Alzahra University, Tehran, Iran
,School of Chemistry, College of Science, University of Tehran, Tehran, IranA.BadieiSchool of Chemistry, College of Science, University of Tehran, Tehran, IranM.AmanlouDrug Design and Development Research Center and Department of Medicinal Chemistry, Faculty of Pharmacy,
Tehran University of Medical Sciences, Tehran, IranR.BazlDrug Design and Development Research Center and Department of Medicinal Chemistry, Faculty of Pharmacy,
Tehran University of Medical Sciences, Tehran, IranJournal Article20140514A simple and efficient one-pot three-component synthesis of the biologically important spirooxindole-4H-pyrans was carried out by the reaction of isatin, activated methylene reagents, and 4- hydroxycoumarin in aqueous medium. SBA-Pr-NH2 was found to be an efficient heterogeneous nanoporous solid basic catalyst (pore size of 6 nm) which can be easily handled and removed from the reaction mixture by simple filtration. This method is of great value because of its environmentally benign character, high yield processing, and easy handling. The biological activity of target compounds was screened by evaluation of their urease enzyme inhibitionhttps://jns.kashanu.ac.ir/article_5422_bc233b6071e0e9ad2080121d582c8705.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Structural, Optical and Electrical Properties of SilverNanoparticlesDeposited by Spin Coating Method501504542310.7508/jns.2012.04.013ENS.DarvishiDepartment of physics, Payame Noor University, P.O.BOX 19395-3697, Tehran, IRAN.S. M.BorgheiDepartment of physics, Karaj Branch, Islamic Azad University, Karaj, IRAN.S. A.HashemizadehDepartment of physics, Payame Noor University, P.O.BOX 19395-3697, Tehran, IRAN.Journal Article20140514In this study, silver nanoparticles were synthesized by chemical reduction method at different concentrations of Ag colloid in the range of 500-16000 ppm. Nanoparticles were deposited by spin coating method on pre-etched glass and Si substrates. Structural, optical and electrical properties of the samples were studied using Scanning Electron Microscopy equipped with EDAX, UV-Vis spectrophotometry and four-point probe. Particles size was determined according SEM results and was compared for two different substrates.https://jns.kashanu.ac.ir/article_5423_da9d8a1f2b6badd3ebcd5a11f2600c96.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Solid-State Thermal Decoposition Method for the Preparation of CuO Nanoparticles505508542410.7508/jns.2012.04.014ENA.Dehno KhalajiDepartment of Chemistry, Faculty of Science, Golestan University, Gorgan, IranK.JafariCollege of Chemistry, Shahrood University of Technology, Shahrood, IranS.Maghsodlou RadDepartment of Chemistry, Faculty of Science, Golestan University, Gorgan, IranJournal Article20140514In this paper, CuO nanoparticles have been synthesized via solid- state thermal decomposition using copper(II) Schiff base complexes as new precursors at 600ºC under air atmosphere for 3 h. Surface morphology of the products were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM).https://jns.kashanu.ac.ir/article_5424_1778c5a1a31008fe7404ae99ac7bf919.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201Numerical Investigation of Nanofluid Mixed Convection and Entropy Generation in an Inclined Ventilating Cavity509518542510.7508/jns.2012.04.015ENH.KhorasanizadehFaculty of Mechanical Engineering, University of Kashan, Kashan, IranJ.AmaniFaculty of Mechanical Engineering, Isfahan University of Technology, Isfahan, IranM.NikfarFaculty of Mechanical Engineering, University of Kashan, Kashan, IranM.HemmatDepartment of Mechanical Engineering, University of Semnan, Semnan, IranJournal Article20140514This paper presents results of a numerical study of mixed convection and entropy generation of Cu–water nanofluid in a square ventilating cavity at different inclination angles. Except a piece of bottom wall with a uniform heat flux, all of the cavity walls are insulated. The inlet port is placed at the bottom of the left wall and the outlet port is positioned at the top of the right wall. Entropy generation, Bejan number, average Nusselt number and heat source temperature have been investigated for Richardson numbers between 0.1 and 10, Reynolds numbers in the range of 1 and 300, solid volume fractions between 0 and 0.06 and cavity inclination angles between ԟ90o and 90o . The results show that the average Nusselt number increases with increasing Richardson number for cavity inclination angle of 30o , 60o and 90o but decreases with increasing Richardson number for inclination angle of ԟ30o , ԟ60o and ԟ90o . Total entropy generation and entropy generation due to heat transfer decreases with increasing Richardson and Reynolds numbers, but the Bejan number increases with increasing Reynolds and Richardson numbers.https://jns.kashanu.ac.ir/article_5425_d2d328dc1f313fdb07cdd1b180526ea1.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201TEM Characterization and Properties of Cu-1 wt.% TiB2 Nanocomposite Prepared by Rapid Solidification and Subsequent Heat Treatment519526542610.7508/jns.2012.04.016ENM.SobhaniCenter of Excellence for high strength alloys technology, School of Metallurgy and Materials Engineering, IranH.ArabiUniversity of Science and Technology, IUST, Tehran, 16845-118, IranA. R.MirhabibiCenter of Excellence for Ceramic Materials in Energy and Environmental Applications, IUST, Tehran, IranJournal Article20140514Copper matrix composite reinforced by 1wt.% TiB2 particles was prepared using in situ reaction of Cu-1.4wt.% Ti and Cu-0.7wt.% B by rapid solidification and subsequent heat treatment for 1-20 hrs at 900ºC. High-resolution transmission electron microscopy (HRTEM) characterization showed that primary TiB2 particles were formed in liquid copper. Heat treatment of as-solidified samples led to the formation of secondary TiB2 particles via spinodal decomposition of titanium-rich zone inside the grains. Mechanical properties (after 50% reduction in area) as well as electrical conductivity of composite were evaluated after heat treatment and were compared with those of pure copper. The results indicated that, due to the formation of secondary TiB2 particles in the matrix, electrical conductivity increased along with hardness up to 10 hrs of heat treatment and reached 65% IACS and 155 HV, respectively. Moreover, the maximum ultimate (i.e. 580 MPa) and yield (i.e. 555 MPa) strengths of composite were achieved at this time.https://jns.kashanu.ac.ir/article_5426_629aec1e69749473686a97db1997350c.pdfUniversity of KashanJournal of Nanostructures2251-78712420121201A Simple Method for Synthesis of Strontium Ferrite Nanoparticles and their Polymeric Nanocomposites527532542710.7508/jns.2012.04.017ENG.NabiyouniDepartment of Physics, Faculty of Science, Arak University, Arak 38156-88349, IranA.YousofnejadDepartment of Physics, Faculty of Science, Arak University, Arak 38156-88349, IranM.SerajDepartment of Physics, Faculty of Science, Arak University, Arak 38156-88349, IranS.Farshad AkhtarianfarInstitute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, I. R.
IranD.GhanbariInstitute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, I. R.
IranJournal Article20140514Hard magnetic SrFe12O19 (SrM) nanoparticles were synthesized by a facile sonochemical reaction. The magnetic nanoparticles were then added to acrylonitrile-butadiene-styrene, polystyrene, polycarbonate, and poly sulfone to make magnetic nanocomposites. The magnetic properties of the samples were also investigated using an alternating gradient force magnetometer. The strontium ferrite nanoparticles exhibited ferrimagnetic behaviour at room temperature, with a saturation magnetization of 39 emu/g and a coercivity of 5070 Oe. The distribution of the SrFe12O19 nanoparticles into the polymeric matrixes increases the coercivity. https://jns.kashanu.ac.ir/article_5427_e22bb3dc859d24bd1221cc7ce99780b5.pdf