Nano-composite coating of Ni-Co/SiO2 is produced by the direct current electrochemical deposition method on the steel substrate. The analyze of X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM) are prepared by a nickel-cobalt alloy coatings and Nano-composite coating of Ni-Co / SiO2 that the electrochemical condition were the same in all of them and their grain size and their surface morphology were compared and analyzed. The grain size of Nano-composite coating was less than the alloy coating and surface morphology of the Nano-composite coating was finer and smoother than the alloy coating. The hardness of Nano-composite coating was more than alloy coating. If the electrolyte temperature be 50 degrees Celsius, then the Nano-composite coating of Ni-Co/SiO2 will have the maximum hardness. Adding surfactant to the electrolyte prevents agglomeration of nanoparticles and thus, increases the amount of particles in the coating and the micro-hardness of the Nano-composite coating of Ni-Co/SiO2.The effect of SDS was more than CTAB for the produced coating and the most optimal value for the SDS concentration in the electrolyte was 0.3 grams per liter.

The increasing worldwide demand for propylene has led extensive research to be deployed for establishing economically feasible alternative methods for propylene production. The oxidative dehydrogenation of propane is a promising route for propylene production that does not suffer from the any drawbacks of traditional methods. However, selectivity control in oxidative dehydrogenation of propane is the only main challenge to industrialization of this process, because propane and propylene can convert to COx and other products. In this investigation, titania-silica supported Nickel-Vanadium catalysts were synthesized and evaluated in oxidative dehydrogenation of propane. Catalysts were characterized by XRD, BET, FT-IR, and SEM tests. The propane oxidative dehydrogenation reactions were carried out in fixed-bed reactor. All samples were tested in the temperature range of 350-550° C The best performance among these prepared catalysts was obtained for 7. 5%Ni-7. 5%V/Si: Ti(1: 1) with propylene yield of 14. 33% at propane conversion of 41. 84% at 550° C

In the organic field effect transistors (OFETs) generation, the silicon gate oxide is 1-2 nm thick. A shrinking of this thickness down to less than 1 nm for the next generation will lead to a couple of orders of magnitude increase in tunneling as well as leakage currents. NiO-SiO2 can be used in a variety of devices, such as in circuit boards and detectors, including sensors, due to its porous structure. Owing to these specific properties, these composites attract the attention of many researches. The methods of sol-gel with using XRD (X-ray Diffraction) technique are used to determine the optimum conditions of obtaining composition and conditions of metallization. The obtained results show that increase in silicon oxide content in samples up to 10 wt. % would lead to almost complete the recrystallization of nickel particles at 50 ° C.

The aim of this study is preparation, characterization, and biological activity evaluation of 2 new collagen composites, Collagen/ (Ag/ RGO) and Collagen/ (Ag/RGO/SiO2) with expected antimicrobial activity. The loading of collagen matrix by self-prepared Ag/RGO and Ag/RGO/SiO2 was varied. The morphology of these antimicrobial agents, as well as of the corresponding collagen composites, was observed by SEM. Their biological activity was evaluated against 3 Gram-negative and 3 Gram-positive microbial strains, as well as against 3 type eukaryotic cells: osteoblast, fibroblast, and epithelial. Dependent on the concentration of Ag/RGO, well pronounced activity against Gram-negative bacterium (E. coli), fungus (C. Lusistaniae) and 2 Gram-positive bacteria (S. epidermidis and B. cereus) was found for Collagen/ (Ag/RGO) composites at weight ratios of 2: 1, 2: 0.8, and 2: 0.6, at the last one accompanied by low cytotoxicity. Dependent on the concentration of Ag/RGO/SiO2 biological activity was found for the Collagen/ (Ag/RGO/SiO2) composites also, better expressed than that of Collagen/ (Ag/RGO) composites with the same level of antimicrobial agent loading. The experimental results demonstrated that the doping of RGO with Ag nanoparticles increases the antimicrobial activity of the Collagen/ (Ag/RGO) composites. Improving its dispersion, the silane matrix in the Ag/RGO/SiO2 additionally increases the biological activity of the studied Collagen/ (Ag/RGO/SiO2) composites and their well- pronounced, broad spectrum (against 3 Gram-negative, 2 Gram-positive bacteria and a fungus), antimicrobial activity is similar to that of the broad spectrum antibiotics. The novel Collagen/ (Ag/RGO) and Collagen/ (Ag/RGO/SiO2) composites are promising antimicrobial collagen biomaterials that widen the assortment of such for variety biomedical applications.