Nanoparticles of TiO2 and TiO2-ZnO composite (2:1 molar ratio) were synthesized utilizing the sol-gel and solution combustion approaches, respectively. Scanning electron microscopic, energy dispersive x-ray, x-ray diffraction, UV-visible spectroscopy, and Brunauer–Emmett–Teller analysis were employed to characterize the synthesized nanoporous TiO2 and the composite of TiO2-ZnO nanoparticles. Fabrication of dye-sensitized solar cells (DSSCs) was carried out by incorporating the synthesized nanoporous materials coating on the photoanodes using the doctor blade technique. Nano TiO2 and the composite of TiO2-ZnO were also analyzed using cyclic voltammetry test, and their performance was compared for the electrochemical detection of potassium ferrocyanide. The composite of TiO2-ZnO exhibited better electrocatalytic activity in comparison with the pure TiO2 nanoparticles. The fabricated DSSCs by employing nano TiO2 particles and TiO2-ZnO composite as the semiconductor photoanode materials were compared for photovoltaic performance. The DSSC fabricated with TiO2 nanoparticles exhibited better photovoltaic performance with an efficiency of 2.22% and a current density of 4.152 mA cm−2 than that fabricated with TiO2-ZnO composite with an efficiency of 0.0022% and a short circuit current density of 0.014 mA cm−2.
Titanium and it's alloys are used in the aerospace industry due to its light weigh, strength and ability to withstand extreme temperatures. Also titanium is as strong as Steel but much lighter, it is twice as strong as aluminum. It is nearly as resistant to corrosion as platinum. Titanium is used in dental implants due to its ability to Osseo integrate (an unusual ability by which titanium fuses with bone tissue through the titanium oxide layer on titanium metal). Titanium dioxide is relatively clear and has an extremely high index of refraction with an optical dispersion higher than diamond. Titanium dioxide is used extensively for paints as it is permanent and has good covering power. The present work involves optimization of the electrolyte composition in order to get a coating with high emissivity on titanium alloy using micro arc oxidation process. It also involves study of other parameters such as Thermo-optical properties, surface and characterization of the coating.
ZnO nano particles and cerium oxide-ZnO composite were synthesized using gel combustion approach. The synthesized ZnO nano particles and CeO2-ZnO composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). Dye sensitized solar cells (DSSC's) were fabricated by coating the photoanodes with the synthesized nanomaterials employing doctor blade technique. The performance of DSSC fabricated using ZnO nanoparticles was compared with the one which was prepared using CeO2-ZnO composite. The nanomaterials of ZnO and CeO2-ZnO were subjected to cyclic voltammetry tests for the electrochemical determination of adrenaline(AD).The DSSC fabricated with ZnO nanoparticles exhibited higher power conversion efficiency when compared to the DSSC fabricated using CeO2 -ZnO composite but the cerium oxide-ZnO composite showed better sensor properties compared to ZnO nanoparticles for the electrochemical determination of Adrenaline (AD).
Titanium and its alloys are very interesting materials for space applications due to their low density and high Static and dynamic strength. They have outstanding strength to weight ratio, good fatigue strength and toughness, low elastic modulus, good bio compressibility, corrosion resistance and anti-magnetic properties. However the tribological properties such as low resistance, high suction Coefficient and difficulty to lubricate have a major restriction to their extensive applications.
Micro-arc-oxidation is an advanced anodic oxidation process, with the combination of electrochemical oxidation and high voltage spark treatment. This novel coating technique is capable of disposing dense, hard ceramic composite coatings for the enhancement of tribological properties and the resistance towards corrosion, electrical and their conductivity and chemical actions.A method for obtaining high micro-hard coating has been discussed.The present work involves optimization of two important parameters: electrolyte composition and current density in order to get a ceramic like coating on Ti 6 Al 4 V alloy with required thermos-optical properties. It also involves the study of various other parameters that would affect the thermo-optical property, surface and characterization of the coating.
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