NANOSCALE
Year:2016 | Volume:3 | Issue:1|Papers Count:7

In this research, magnesium ferrite, copper ferrite and cadmium ferrite nanoparticles were synthesized by thermal treatment method by using a solution that contained poly (vinyl alcohol) (PVA). The structural characteristics of the calcined samples were determined by X-ray diffraction (XRD) that the results confirmed the presence of crystal phases in the all ferrite nanoparticles. Field emission scanning electron microscope (FESEM) 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 spectroscopy (FT-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 magnetization (Ms) and magnetic cA/mrcivity (Hc) were obtained at room temperature by using a vibrating sample magnetometer (VSM) which demonstrated cadmium and copper ferrites had ferromagnetic behaviors and magnesium ferrite had super paramagnetic. Electron paramagnetic resonance (EPR) spectroscopy showed the existence of unpaired electrons for the all ferrite nanoparticles and measured the peak-to-peak line width (DHpp), the resonant magnetic field (Hr) and the g-factor values.

Au nanoparticles have been synthesis by chemical method. Optical properties of Au nanoparticles have been studied by using UVVis, 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 refraction and nonlinear absorption indexes obtained in order of 10-8 cm2/W −and 10-4 cm2/W with using continue wave Nd: YAG laser (l=532 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.

Crystalline CeO2/TiO2 core/shell nanoparticles with and without hydroxypropyl cellulose were synthesized via a three-step process. The CeO2/TiO2 core/shell structure formation was confirmed by x-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and field emission scanning electron microscopy (FESEM). The nanoparticles exhibited notable sensitivity to volatile organic compounds at room temperature and selective gas sensing properties. CeO2/TiO2 core/ shell nanoparticles were showed at 340 ppm of ethanol with and without HPC sensitivity 16 and 10 units, respectively. Short response and recovery times and low temperature sensing were measured as other improvement properties of the sensors. The sensing mechanism nanoparticles were explained based on the change of the heterojunction barrier formed at the interface of CeO2 and TiO2.

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 CZA (G/N=2) 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.

First of all, two medical nanofluids containing single-walled carbon nanotube as nano-platform with loaded (MF1) and conjugated (MF2) anticancer drug cisplatin were prepared and thermal characteristics of these nanofluids were surveyed. The thermal property of nanofluid can play an important role on drug release of cisplatin in target region especially cancerous tumors. Due to different bonds of cisplatin on carbon nanotubes, thermal property of nanofluids were completely different which were checked using thermal conductivity (TK). Results show siginificant change of TK during dialysis of MF2 nanofluid because of entrapped cisplatin release inside carbon nanotube. This shows the important role of cisplatin as a thermal drug to increase of drug efficacy and reduce the drug side effects for cancer treatment.

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 super paramagnetic 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 pH=6, time=15 min and pollutant concentration= 10 mg/ml. Absorbtion process resulted from Tempkin adsorption isotherm and quadratic kinetics is R2=0.99 and R2=0.986, respectively. The results obtained from this study showed the ability of magnetic graphene oxide to the elimination of ketoconazole drug from water.