@article { author = {Shojaosadati, S. A. and Ganji, F. and Zahedi, B. and Rafiee-pour, H. A. and Ghourchian, H.}, title = {Effect of Different CNT’s Oxidation Methods on Thiocoline Detection by Surfactant Modified Graphite Electrodes}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {195-204}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Carbon nanotubes are regarded as promising building blocks for the construction of novel biosensors due to their unique properties like fast electron transfer, high electrocatalytic effect and good biocompatibility. In the present study, the effect of different chemical oxidation’s methods of multi-walled carbon nanotubes (MWCNTs) on the electrochemical behavior of modified graphite electrodes has been investigated. The MWCNTs were oxidized by using three kinds of oxidants: a) concentrated nitric acid (65 wt %), b) mixture of concentrated sulfuric acid (98 wt %) and nitric acid (65 wt %) (3:1), and c) hydrochloric acid (2M) followed by acid mixture of (b). The results of oxidation procedures were characterized by infrared spectroscopy. Graphite electrode surface was modified with cationic, anionic, and non-ionic surfactants. The obtained results showed that amperometric responses of functionalized CNTs were enhanced with cationic surfactant-modified electrodes. The sensitivity of nitric acid treated CNT/DTAB/graphite electrode has been enhanced by 47% and its detection limit has reduced to 0.01 mM for amperometric thiocholine detection. }, keywords = {Multi-walled carbon nanotubes,Modified graphite electrode,Functionalization,Surfactants,Thiocholine detection}, url = {https://www.ijnnonline.net/article_3954.html}, eprint = {https://www.ijnnonline.net/article_3954_acc0c25b595b51a58661c5c8822b0a00.pdf} } @article { author = {Davoodi, J. and Ahmadi, M.}, title = {Size Dependence of the Elastic Properties of Pd Nanowire: Molecular Dynamics Simulation}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {205-209}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {The mechanical properties including elastic stiffness constants as well as bulk modulus of Palladium (Pd) nanowire were calculated in the constant temperature and pressure (NPT), ensemble by molecular dynamics (MD) simulation technique. The quantum Sutton-Chen (Q-SC) many-body potential was used to calculate the cohesive energy as well as forces experience by every atoms. The temperature and pressure of nanowire were controlled by Nose-Hoover thermostat and Berendsen barostat, respectively. The periodic boundary condition (PBC) was only applied along the axis of nanowire. The MD results show that the mechanical properties depend on diameter of nanowire. Our results show that elastic constants including C11 , C12 , C44 and bulk modulus increase nonlinearly with increasing the diameter of nanowire and then reach a constant value, which is a typical behavior of nanoscopic systems.}, keywords = {Pd nanowire,Mechanical properties,Molecular Dynamics Simulation}, url = {https://www.ijnnonline.net/article_3955.html}, eprint = {https://www.ijnnonline.net/article_3955_324cf61a1af8f8e45e29ca04cebe9b5f.pdf} } @article { author = {Bayat, Y. and Shirazinia, S. R. and Marandi, R.}, title = {Ultrasonic Assisted Preparation of Nano HMX}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {210-215}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Size reduction of high energy materials such as 1, 3, 5, 7-tetranitro- 1, 3, 5, 7-tetraaza cyclooctane (HMX) has considerable influences on improving their explosive characteristics. In this study, nanosized HMX par‌ticles were produced using ultrasonically reprecipitation method by applying water as a safe and accessible antisolvent instead of unsafe conventional methods. SEM photographs revealed that much uniform and low agglomerated spherical morphology can be obtained at low concentration of HMX- acetone solution with low temperature antisolvent. These results are achieved from SEM and TEM photographs and Digimizer - Winks software.}, keywords = {Ultrasonically reprecipitation,Nano-size HMX,Size reduction,High energetic materials}, url = {https://www.ijnnonline.net/article_3956.html}, eprint = {https://www.ijnnonline.net/article_3956_acae5b342fea18aeabcf6d1a98a94c91.pdf} } @article { author = {Movahedi, M. and Mahjoub, , A. R. and Yavari, I. and Kowsari, E.}, title = {Microwave Assisted Synthesis of Polycrystalline Flower-like ZincOxide Nanostructure Using Dicationic Ionic Liquid}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {216-222}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {In this paper, synthesis of the flower-like zinc oxide was performed using microwave assisted dicationic ionic liquid [mmp(im)2 ]Br2 . The polycrystalline flower-like zinc oxide nanostructure was obtained when a suitable mole ratio (ionic liquid /zinc acetate) and short duration microwave was used. X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were employed to characterize of the as-synthesized zinc oxide. The SEM image illustrates that the surface of flower-like zinc oxide is polycrystalline with nanoparticles of about 48 nm. The samples fabricated in presence and absence of ionic liquid exhibited (UV, green-yellow) and (UV, blue, green) emission, respectively, while Commercial ZnO exhibited UV and green emission. }, keywords = {Zinc oxide,Flower-like,Polycrystalline,Ionic liquid,Luminescence}, url = {https://www.ijnnonline.net/article_3957.html}, eprint = {https://www.ijnnonline.net/article_3957_5b91dee028384c84d59153ce72bf0b77.pdf} } @article { author = {Zare, D. and Akbarzadeh, A. and Bararpour, N.}, title = {Synthesis and Functionalization of Gold Nanoparticles by Using of Poly Functional Amino Acids}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {223-230}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Synthesis and characterization of two functionalized gold nanoparticles by using of two poly functional amino acids (L-Arginine and L-Aspartic acid) are reported. The gold nanoparticles were reduced by sodium citrate and functionalized with L-Arginine at the pH of 7 and 11 and L-Aspartic acid at the pH of 7. Transmission electron microscopy, UV-Vis spectroscopy, dynamic light scattering, zeta potential and agarose gel electrophoresis techniques were used for characterization and identification. The transmission electron microscopy image showed well distributed particles with an average size of about 10 nm. At the pH of 7, the results obtained, verified that the interaction between L-Arginine and gold nanoparticles was electrostatic and it was covalent/coordinate in the case of L-Aspartic acid. The functionalized gold nanoparticles possessing free amine and carboxylic groups (poly functional amino acid) could play an important role in conjugating biomolecules such as proteins (e.g. antibodies) and DNA in nanomedicinal and nanobiotechnological applications. In addition, if the pH of the target in vivo environment is constant, functionalized gold nanoparticles bound electrostatically will be preferred. On the other hand, if the pH of the target in vivo environment is variable, then amino acid capped gold nanoparticles bound covalently/coordinately are recommended.}, keywords = {L-Arginine,L-Aspartic acid,Functionalization,Gold Nanoparticles (GNPs)}, url = {https://www.ijnnonline.net/article_3958.html}, eprint = {https://www.ijnnonline.net/article_3958_493b42e25689c6ead1e5ea4a6464ebcc.pdf} } @article { author = {Mohammadkhani, S. and Aghaziarati, M.}, title = {Production of Iron Disulfide Nanoparticles by Hydrothermal Process}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {231-235}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {In this research, a single-stage low-temperature hydrothermal synthesis route was successfully developed for preparation of Iron Disulfide. The prepared powder was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). These analyses showed that nanoparticles were well crystallized, pyrite was the main product and the shape of crystals was nanorod. Also, the influences of reaction temperature and iron source on the formation of the target compound were investigated. }, keywords = {Iron Disulfide,nanoparticles,hydrothermal process,Pyrite}, url = {https://www.ijnnonline.net/article_3959.html}, eprint = {https://www.ijnnonline.net/article_3959_3e68e38f9774ce71a192bc28ea9ff935.pdf} } @article { author = {Sharma, P. and Singh, S. and S.Virk, H.}, title = {Formation of CdS Nanoparticles in Microemulsion Using Different Co-surfactant and Water to Surfactant Molar Ratio}, journal = {International Journal of Nanoscience and Nanotechnology}, volume = {6}, number = {4}, pages = {236-243}, year = {2010}, publisher = {Iranian Nanotechnology Society}, issn = {1735-7004}, eissn = {2423-5911}, doi = {}, abstract = {Cadmium Sulphide (CdS) nanoparticles were prepared using microemulsion method using cadmium chloride as cadmium source and sodium sulphide as sulphur source. The obtained nanoparticles structures were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) whereas optical characterization was done by Ultra Violet-Visible absorption. XRD result shows that CdS nanoparticles of hexagonal phase are formed. The TEM result indicates that the synthesized CdS nanoparticles are of variable morphology like spherical, cylindrical, nanorods and nanoneedles. Histograms help to evaluate size and aspect ratio of nanoparticles. UV-Visible spectroscopy reveals that as prepared CdS nanoparticles show a quantum confinement effect with shift in band gap. It is also found that water to surfactant molar ratio (wo) and co-surfactant are vital factors in the morphology and optical properties of CdS nanoparticles. }, keywords = {Microemulsion,nanoparticles,nanoneedles,Nanorods,Quantum confinement,molar ratio,Co-surfactant,band gap shift}, url = {https://www.ijnnonline.net/article_3960.html}, eprint = {https://www.ijnnonline.net/article_3960_33d57e386622fac5bfc8d3bcf923d96c.pdf} }