Journal of Nanoanalysis
Volume:3 Issue: 1, Apr 2016

Oxidation of cyclooctene was studied in presence aqueous hydrogen peroxide (30%, v/v) over nano iron oxide. The catalyst prepared by microemulsion method and characterized using various techniques including XRD, TEM and BET techniques for evaluating phase, structure and morphology and surface area. In this study, we investigated the effects of varying the catalyst content, reaction temperature, H2O2 to cyclooctene molar ratio, reaction temperature and solvent. Epoxycyclooctane was found to be the main reaction product, along with amounts of other products. The best result for epoxycyclooctane production is obtained using acetonitril as solvent at 78 oC for a 16 h reaction period with 0.32 g nano-sized iron particle catalyst. The nano-Fe2O3 catalyst has more conversion and yeild than the other iron catalysts in cyclooctene oxidation because of its high surface area and appropriate particle size.

Microwave absorbing property of composites containing Ag nanoparticles filled multiwalled carbon nanotube buckypaper (Ag-BP) has been investigated. Buckypaper doped with silver was prepared by direct dispersion and filtration method. From the low temperature resistivity measurement it was found that increasing doping level decreases the electrical conductivity of the buckypaper. 30 wt. % and 40 wt. % of Ag-BP samples shows the maximum transmission coefficient, with very high conductivity. The results demonstrate that microwave absorption of Ag-BP was attributed only due to the dielectric loss rather than other losses.The absorption peak frequency of the Ag/MWCNTs BP can be controlled easily in the presence of Ag nanoparticles into the CNT mats.

The Fe-Ni-Sb-B amorphous alloy has been prepared by a solid-solid chemical reaction of ferric trichloride, nickel chloride, antimony chloride and potassium borohydride powders at room temperature. The inductive couple plasma study indicates that the resultant is composed of Fe 5.38 %, Ni 56.19 %, Sb 29.02 % and B 0.44 %. The XRD and thermal analysis show that the alloy is a non-strict sense amorphous alloy which constituted with NiSb and FeNiB. The TEM image shows the resultant is spheroidicity particles which average size is estimated to be 20-30 nm. The mole ratio of the metal salts has been determined to be 1.0:1.0:0.25 to get the amorphous alloy. The largest saturation magnetization value of the 17.35 emu/g is obtained.

In this contribution, an effective and soft method for removal of template from nanochannels of mesoporous silica (MCM-41) is proposed. This method is based on chemically-modified solvent extraction which enhanced by means of an auxiliary organic compound, i.e. benzene sulfonamide. Template removal was performed in soft condition, i.e. in the presence of diluted sulfuric acid and at ambient temperature. Presence of benzene sulfonamide extremely improves efficiency of template removal process. The template-extracted mesoporous silica was characterized using powder X-ray diffraction, nitrogen adsorption, transmission electron microscopy, thermogravimetry, elemental analysis and FT-IR spectrometry. Results of XRD, nitrogen adsorption, and TEM displayed that well-ordered hexagonal array of mesopores remained intact after extraction. The obtained results from  thermogravimetry, elemental analysis and FT-IR spectrometry indicate that at least up to 94 wt % of template was removed in short time.