Sol Sol-gel synthesis, structural and optical properties investigation of Ce4+ doped CdO sub-micron materials

Highly crystalline Ce4+ -doped cadmium oxide sub-micron structures were synthesized by calcinations of the obtained precursor of a sol-gel reaction. The reaction was carried out with cadmium nitrate (Cd(NO3)2.4H2O), cerium nitrate Ce(NO3)4.6H2O and ethylene glycol (C2H6O2) reactants without any additive at 80°C for 2h. Resulting gel was calcined at 900 °C with increasing temperature rate of 15°C per minute for 12 h in a furnace. As a result of heating, the organic section of the gel was removed and Ce4+ - doped cadmium oxide micro structure was produced. The obtained material synthesized from the sol-gel technique, possesses a cubic crystalline structure at micro scale. X-ray diffraction (XRD) study indicates that the obtained Ce4+ -doped CdO has a cubic phase. SEM images showed that the resulting material is composed of particles with cluster structure. Other two techniques FT-IR and UV-Vis spectroscopies were employed for further characterization of the Ce4+ -doped CdO micro structures. Downloaded from 78.38.150.28 at 1:07 IRDT on Thursday May 25th 2017 K e

One pot three component synthesis of 2-amino-4H-chromene derivatives under microwave irradiation using Sr2As2O7 nanocatalyst

2-Amino-4H-chromene compounds are belonged to an important heterocyclic groups that have extensive important in organic chemistry and medicine. The compounds have anti-cancer, anti-bacterial, anti-coagulation and anti-tumor properties and have applications to produce dye, make up and hygienic materials. Until know, several methods have been reported for the synthesis of the compounds. Most of them, suffers defects such as poisoning and volatile solvents, low yield, high length reaction time, and no reusability of used catalyst. In the present work, Sr2As2O7 pyrochlore material was used as a catalyst for the synthesis of 2-amino-4H-cromens derivatives using a three component one-pot synthesis method under microwave irradiation. The raw materials were aromatic aldehydes, malononitrile and beta-naphtol. Sr2As2O7 was synthesized by an ultrasonic assisted solvothermal method using H2O and C2H5OH solvents mixtures at the 1:1 volumetric ratio. The materials were characterized by PXRD, FESEM and FTIR techniques. Then, the catalytic performance of the synthesized nanomaterial was used for the synthesis of 2-amino-4H-chromene derivatives. To do the process, the reaction parameters such as reaction time, solvent type and catalyst amount were optimized and the reactions were performed under the conditions. It was found that the optimum conditions were 15 mg catalyst, H2O as solvent and 6-9 min reaction time

Investigation of lithium silicate compounds stability by means of x-ray diffraction method (XRD)

In this work, the comprision of phase stability of lithium silicates in the ratios of Li:Si 1:2 and 1:3 from the raw materials of lithium nitrate and silicic acid and in the ratio of Li:Si 1:2 from the raw materials of lithium sulphate and silicic acid in the temperatures of 48, 72, 96 and 120 h with using x-ray diffraction method was performed. Also, we calculated inter planar spacing (d) of the synthesized materials with using Braggs equation. Synthesized materials sizes were calculated via scherrer equation in different phases and in different Li:Si molar ratios. Cell parameters of lithium metasilicate are a=9.392, b=5.397 and c=4.66 Ã and the parameters for lithium disilicate are a=15.82, b=14.66 and c=4.79Ã. Cell parameters of lithium sodium silinaite are a=5.06, b=8.23 and c=14.38Ã with space group of A2/n. Results show that lithium metasilicate and lithium disilicate have space groups of Cmc21 and Ccc2, respectively