@article { author = {Khosroshahi, M. E. and Ghazanfari, L.}, title = {Synthesis of Three-Layered Magnetic Based Nanostructure for Clinical Application}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {57-64}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {The 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.}, keywords = {Multilayer nanostructure,Magnetic Properties,UV-Vis Spectroscopy}, url = {https://www.ijnnonline.net/article_3941.html}, eprint = {https://www.ijnnonline.net/article_3941_238cb31aa941657e125c7e7b04e6cd0d.pdf} } @article { author = {Salehani, H. K. and Esmaeilzadeh, M. and Shakouri, Kh. and Abolhassani, M. R. and Faizabadi, E. and Majlesara, M. H.}, title = {Electronic Properties of a Concentric Triple Quantum Nanoring}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {65-71}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {In 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.}, keywords = {Quantum rings,Electronic properties,Energy spectra,Magnetic flux}, url = {https://www.ijnnonline.net/article_3942.html}, eprint = {https://www.ijnnonline.net/article_3942_0596e7b3519a2a8a422846c327f0256c.pdf} } @article { author = {Sabbaghi, S. and Bazargan Lari, R. and Zeraatkar, M.}, title = {Multilayer Nano Films for Corrosion Control}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {72-77}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Nano 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.}, keywords = {Corrosion,Nano films,Nanotechnology}, url = {https://www.ijnnonline.net/article_3943.html}, eprint = {https://www.ijnnonline.net/article_3943_4c52d9cde7154192baa4c809c58394cd.pdf} } @article { author = {Pipelzadeh, E. and Valizadeh Derakhshan, M. and Babaluo, A. A. and Haghighi, M. and Tavakoli, A.}, title = {Formic Acid Decomposition Using Synthesized Ag/TiO2 Nanocomposite in Ethanol-Water Media Under Illumination of Near UV Light}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {78-86}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {The 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.}, keywords = {Nanocomposite,TiO2,Ag,Calcination,photocatalytic activity,Ethanol-water media}, url = {https://www.ijnnonline.net/article_3944.html}, eprint = {https://www.ijnnonline.net/article_3944_00d686d587cfcd5a3a7d27ef13f08f90.pdf} } @article { author = {Ayati, A. and Ahmadpour, A. and Bamoharram, F. F. and Heravi, M. M . and Rashidi, H. and Tanhaei, B.}, title = {Application of Molybdophosphoric Acid as Reducing Agent/ Stabilizer in the Synthesis of Gold Nanoparticles under UV Irradiation}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {87-93}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {In 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.}, keywords = {Polyoxometalate,Molybdophosphoric acid,Gold,Nanoparticle,UV irradiation}, url = {https://www.ijnnonline.net/article_3945.html}, eprint = {https://www.ijnnonline.net/article_3945_d4ce36e5eff68b5636794bedcdd44a2b.pdf} } @article { author = {Taghvaei, V. and Habibi-Yangjeh, A. and Behboudnia, M.}, title = {Simple and Low Temperature Method for Preparation of Nanocrystalline ZnO in Presence of [EMIM][EtSO4] and Their Photocatalytic Activities}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {94-101}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Simple, 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.}, keywords = {Zinc oxide,Room-temperature ionic liquid,Nanocrystalline,Photocatalysis}, url = {https://www.ijnnonline.net/article_3946.html}, eprint = {https://www.ijnnonline.net/article_3946_6b09621a3b4a4f520a1300e1a2c313bf.pdf} } @article { author = {Sheikhloo, Z. and Salouti, M.}, title = {Intracellular Biosynthesis of Gold Nanoparticles by the Fungus Penicillium Chrysogenum}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {7}, number = {2}, pages = {102-105}, year = {2011}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {In 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.}, keywords = {Gold nanoparticles,Biosynthesis,Penicillium chrysogenum}, url = {https://www.ijnnonline.net/article_3947.html}, eprint = {https://www.ijnnonline.net/article_3947_37c90565faf74a81804dca14d363f606.pdf} }