فصلنامه نانو مقیاس
سال سوم شماره 1 (پیاپی 9، بهار 1395)

In this research, magnesium ferrite, copper ferrite and cadmium ferrite nanoparticles were synthesized by thermal treatment method by using a solution that contained polyvinyl alcohol PVA. The structural characteristics of the calcined samples were determined by X-ray diffractionXRD that the results confirmed the presence of crystal phases in the all ferrite nanoparticles. Field emission scanning electron microscopeFESEM obtained the particle sizes of the 5 to 8, 10 to 33 and 47 to 138 nm for magnesium ferrite, copper ferrite and cadmium ferrite nanoparticles respectively. Fourier transform infrared spectroscopyFT-IR confirmed the presence of metal oxide bands for the all calcined samples. Moreover, FT-IR spectra showed that the modes which related to organic compounds removed in more than 773 K. Magnetic properties such as saturation magnetizationMs and magnetic coercivityHc were obtained at room temperature by using a vibrating sample magnetometerVSM which demonstrated cadmium and copper ferrites had ferromagnetic behaviors and magnesium ferrite had superparamagnetic. Electron paramagnetic resonanceEPR spectroscopy showed the existence of unpaired electrons for the all ferrite nanoparticles and measured the peak-to-peak line width ΔHpp, the resonant magnetic fieldHr and the g-factor values.

Au nanoparticles have been synthesis by chemical method. Optical properties of Au nanoparticles have been studied by using UV-Vis and z-scan method and Raman spectroscopy. In addition, the mass attenuation coefficients of the synthesized nanoparticles at different energies were measured by the gamma spectroscopy method. The UV-Vis spectrum of these nanoparticles exhibit an absorption peak at 530 nm region. Nonlinear reflection and nonlinear absorption indexes obtain from close aperture and open aperture z-scan in order of 10-8 cm2/W and 10-4 cm/W were studied with using continue wave Ne: YAG laser λ532 nm by use of closed aperture and open aperture z-scan setup, respectively. The performed measurements show that gamma irradiation affects the mass attenuation coefficient and optical properties of Au nanoparticles.

In recent decades, the utilization of hydrogen as a clean energy carrier due to environmental problems of fossil fuels is highly regarded. In order to produce on-board hydrogen from methanol as an effective method for applying feed of fuel cell vehicles, in this paper CuO-ZnO-Al2O3 nanocomposites are used. These nanocomposites were synthesized by the fast and simple microwave assisted combustion method. Considering that the fuel/nitrates ratio is one of the effective parameters on quality of the prepared nanocomposite, the effect of glycerol to nitrates ration were investigated in this study. XRD, FESEM, FTIR, EDX, and BET analyses were used to determine the physicochemical properties of fabricated nanocomposites. These analyses suggested that increasing of this ratio led to decrease of zinc oxide crystallinity. Also the change of this ratio resulted an optimum of active phase dispersion and surface area. The catalytic experiments results proved that enhancement of glycerol/nitrates ratio to methanol conversion have an optimum value which is 2. As a result, the CZAG/N2 due to higher surface area and dispersion of active phase has higher methanol conversion. Also, the stability results of this sample for 1440 minutes showed that no significant change in methanol conversion and products selectivity.

In this paper, the structure of the magnetic core-shell nanoparticles functionalized by an imide group was investigated by a simple co-precipitation method. The Fe3O4 nanoparticles as a super paramagnetic and Non-toxic core it was covered with a layer of silica. The resulting nanoparticle functionalized by amino trie thoxy silane and then by Perylene pigments Ttracrbonic acid anhydride. The magnetic structural and thermal properties of the new imide functionalized nanoparticles investigated. The crystaline structures of the nanoparticles were studied by X-ray diffraction and crystalline size was calculated using the Debye-Scherrer formula. The shape, morphology and The approximate size of the nanoparticles was determined by scanning electron microscopy SEM.The magnetic properties of nanoparticles was investigated by Magnetometer vibrating sample VSM that shown superparamagnetic behavior for the samples. The thermal properties of the new imide functionalized nanoparticles were investigated by thermal analysis TGA. Finally, infrared spectrometer FTIR was used to identify the nanoparticles functionality.

In recent years the use of anti-fungal for the treatment of diseases in agriculture and animal husbandry industry has increased. This compounds are metabolized and freely broadly entered into surface water sources, drinking and soil. The distribution of anti-fungal in nature, causing problems such as destruction of indigenous fungal population And fungal resistance to the antifungal gets. In this research, design and manufacture of magnetic graphene oxide nano sheet to produce suitable absorbent to absorb the antifungal ketoconazole. And the Staden-Meier method was used to produce graphene oxide And the stand-Meier method was used to produce graphene oxide.The results of present study showed that the highest removal efficiency of studied variables are pH6, time 15 min and pollutant concentration 10 mg/ml. Absorbtion process resulted from Tempkin adsorption isotherm and quadratic kinetics is R20/99 and R20/986,respectively. The results obtained from this study showed the ability of magnetic graphene oxide to the elimination of ketoconazole drug from water.