Wu Jianpeng

Facile synthesis and enhanced photocatalytic activity of Sm(OH)3 nanorods

Samarium hydroxide (Sm(OH)3) nanorods with enhanced photocatalytic activity to degrade RhB were prepared by a facile precipitation method. The phase composition, morphology and optical properties of the as-prepared sample were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The results show that the as-prepared Sm(OH)3 nanocrystallites are hexagonal phase with a rod-like microstructure, and exhibit a strong absorption ability of UV light. Moreover, the low temperature precipitation synthesis introduced an amorphous layer on the Sm(OH)3 nanorods, which was confirmed to have a positive impact on improving the photocatalytic activity of Sm(OH)3 nanorods.

Synthesis Of Nanometer LiNiVO4 By A Wet Chemical Process Under Ultrasonic Irradiation

Experimental Analytical grade NH4 VOy LiCI2, NiCl2 and NH2CONH2 were selected for use in this work. A tool for irradiating ultrasound was an available commercial device (ultrasonic irradiator, Jiu Zhou, China) with a variable power of l00-300W. The sonic horn was made ofTi (tip diameter x length = <l>lOmmx 70mm) was driven by a PZT transducer. Firstly, NH4V03, LiCl2 and NiCl2 were weighed and mixed according to the mol ratio of Li/NiN= 1/1/1. The mixtures were dissolved in distilled water to form a homogenous solution. During the solution process, the solution was heated and maintained at 40°C. Then the NH2CONH2 was added into the solution under vigorous stirring to make a homogenous sol. The concentration of [Li+] and [NH2CONH2] in the solution was controlled at 0.664mol/L and 3.32mol/L respectively. During this process, the sonic horn was dipped into the solution around IOmm distance from the bottom of the flask and the ultrasonic sonic power and amplitude were adjusted to provide different power output of the generator (1oo-3OOW).After 6 hours reaction under ultrasonic irradiation, the sol was dry in 80°C for a sufficient time to make the sol into dry gel precursor. Next, the gel was dried at 100DCfor two hours and primrose yellow Li-Ni-V-O dry gel precursor was prepared. After that, the dry gel was heated slowly at 5°C/min up to 300-700°C in an electric furnace using alumina crucibles and maintained at the highest temperature for various times. After calcining, the powders were allowed to cool down to room temperature and ground up lightly with mortar and pestle. Finally, the powders were washed with de-ionized water 4 times to remove any dissoluble ion and then with alcohol twice to prevent the agglomeration of the particles. The as-prepared powders were characterized by X-ray diffractometry (XRD) using a high-resolution Seifert-FPM diffractometer operating with CuKa radiation at 40kV and 40mA, divergence slit of 1°, receiving slit width of 0.1 mm and a scan rate of 2°/min. Peak position and line width variation were controlled with the measurement of XRD lines of a standard silicon sample. The Debye-Scherrer equation, r = KAlBcosS, was used in order to determine the crystallite sizes of LiNiV04 along the (311) direction where; r is the crystallite size, K is a constant, Iv is the wavelength of the CuKu radiation and B is the line width of the XRD peak. Thermal studies of the gel precursor were carried out in air at a heating rate of IO°Cmin-L using a Simultaneous TG/DTA Thermal Analyzer, ranging from room temperature to 8000C (made by Dupont Company of USA). The crystallite morphologies of the samples were analyzed in a transmission electron microscope (TEM) operated at 200 kV.TEM specimens were prepared by depositing a few drops of LiNiV04 dispersed in acetone on a carbon-coated copper grid. 70 (I) (4)

Fabrication Of Samarium Monosulfide Thin Films By An Electrodeposition Process

Conclusions A new technique, called equal channel angular rolling (ECAR) was used to fabricate AZ31 magnesium alloy sheets. Compared with the as-received/annealed sheets the press formability of the AZ31 magnesium alloy sheets produced by this technique at room temperature was improved dramatically. This was seen to be very useful technique for application to the production of magnesium alloy structures.