Parametric Investigation of EP To Enhance Surface Characteristics of Maraging Steel With Organic Electrolyte

Maraging steel 300 is widely used in aircraft, tools, and automotive industries, which requires a polished surface for better performance. In conventional methods of polishing, the abrasives directly contact the workpiece surface and deteriorate its property. Thus, a non-conventional method like Electropolishing (EP), is utilized to finish maraging steel with acetic acid (99.7 wt.%) and perchloric acid (70 wt.%) mixed in the volume of 3:1. Linear sweep voltammetry (LSV) is performed to determine the passive region that gives the best electropolishing performance. Different parameters, namely temperature, agitation, and polishing time and their effect on surface roughness and surface reflectance, are observed during EP. The optimized process parameters which give the best EP performance are the temperature at 60ºC, rotation of magnetic stirrer at 400 rpm, and polishing time of 6 minutes. An improvement of 56% in surface roughness and 60% in surface reflectance from its initial value of 21% is observed. EP makes the surface hydrophilic as the contact angle changes from 111.2º to 68.6º. Energy-Dispersive X-Ray Spectroscopy analysis suggests that after EP, a metal oxide layer forms on the surface which helps in increasing corrosion resistance.

COMPUTER QUANTUM-CHEMICAL SIMULATION OF MULTICOMPONENT SIO-MEO SYSTEMS

Впервые с помощью компьютерного квантово-химического моделирования показана возможность формирования поликомпонентных систем SiO - FeO, SiO -MnO и SiO - CuO путем адсорбции на поверхности микросфер SiO металлоксидного слоя, состоящего из наночастиц диоксида марганца (IV), смешанного оксида железа или наночастиц оксида меди (II). По результатам сканирующей электронной микроскопии установлено, что формирование металлоксидного слоя в образце SiO - FeO произошло наиболее равномерно среди всех представленных образцов поликомпонентных систем. В рамках квантовохимического моделирования установлено, что наиболее энергетически выгодным и стабильным является взаимодействие SiO с наночастицами FeO . For the first time, in this work, the possibility of forming multicomponent SiO -FeO, SiO -MnO and SiO - CuO systems by adsorption of a metal oxide layer consisting of nanoparticles of manganese (IV) dioxide, mixed iron oxide or nanoparticles of copper (II) oxide on the surface of SiO microspheres has been shown by means of a computer quantum-chemical simulation. According to the results of the scanning electron microscopy, it was found that formation of a metal oxide layer in the SiO - FeO sample occurred most uniformly among all the presented samples of multicomponent systems. Within the framework of quantum-chemical simulation, it was found that the most energetically favorable and stable was the interaction of SiO with FeO nanoparticles.

Enhancing Perovskite Solar Cell Performance through Surface Engineering of Metal Oxide Electron-Transporting Layer

Perovskite solar cells have gained increasing interest in recent times owing to the rapidly enlarged device efficiency and tunable optoelectronic properties in various applications. In perovskite solar cells, interface engineering plays an important role in determining the final device efficiency and stability. In this study, we adopted TiCl4 treatment to reduce the surface roughness of the metal oxide layer and improve the perovskite film quality to obtain better device performance. After proper TiCl4 treatment, the efficiencies of TiCl4–TiO2- and TiCl4–ZnO-based devices were significantly enhanced up to 16.5% and 17.0%, respectively, compared with those based on pristine TiO2 and ZnO (13.2% and 10.2%, respectively).

Durable organic solar cells produced by in situ encapsulation of an air-sensitive natural organic semiconductor by the fullerene derivative and the metal oxide layer

Oxygen-barrier properties of PC71BM and MoO3 enable the production of long-lasting organic solar cells employing highly oxygen-sensitive small electron donors.

Resistive Switching Behavior of Au/TiO2/NiCr Structure

Thin film memristor behavior depends on the choice of top and bottom electrode material and metal oxide layer. In the present work, the influence of the top and bottom electrode layers on the electric field-induced resistance switching phenomena of TiO2-based MIM was studied. Au/TiO2/NiCr and NiCr/TiO2/Au structures were fabricated by depositing TiO2 active layer by reactive dc magnetron sputtering technique between thermally evaporated NiCr and Au electrodes. TiO2 layer was sputtered with a cathode power of 150[Formula: see text]W keeping the other deposition parameters constant. TiO2 films were analyzed by X-ray diffractometer, field emission scanning electron microscopy and UV–Visible spectrophotometer to investigate their structural, morphological and optical behavior. Structural studies of the films reveal that the samples were amorphous. And the [Formula: see text]–[Formula: see text] analysis for the fabricated MIM structure was analyzed.