Amir Abidov

The Evaluation of Photocatalytic Properties of Iron Doped Titania Photocatalyst by Degradation of Methylene Blue Using Fluorescent Light Source

Transition metal ion-doped titanium dioxide (TiO2) powders were prepared by mechanochemical milling. Photocatalytic properties of the prepared semiconductor were evaluated using photodegradation of methylene blue under UV and visible light. Dye bleaching was observed spectrophotometrically. Color removal was reached after 120 min. The effect of varying concentration of organic dye, amount of TiO2 photocatalyst, particle size, pH, and stirring rate was observed on the efficiency of reaction. The maximum photocatalytic decomposition of methylene blue solution was achieved with 25nm particle size TiO2, which was ascribed to the enlarged surface area. All obtained results were discussed.

Rapid & low-cost prototyping of metallic patterns in limited facilities condition

This paper presents rapid and cost-efficient prototyping metalizing method for fabrication of metal contacts. It demonstrates the technical improvement in metalizing achieved by transparency photomask printing compared to conventional methods. It describes fabrication of microelectrodes on various substrates such as glass and plastic using conventional office laser printer. Presented method can be used for quick prototyping of sensors, microheaters, micro hotplates and metal interconnects. Experimental results showed that prepared metallic micro contacts on glass substrate are compatible with conventional soldering.

Mechanical properties of stainless steel composites with titanium carbonitride consolidated by spark plasma sintering

In this paper, stainless steel–titanium carbonitride-based composites were fabricated and analyzed to utilize for bipolar plate in fuel cells. In order to study the size effect of titanium carbonitride on the mechanical and corrosion resistance properties of the composites, micro and nanosize titanium carbonitride powders were used. Stainless steel–carbonitride composites were prepared by spark plasma sintering and subsequently annealed at different temperatures up to 1100℃ to improve the morphological and mechanical properties. Various properties of the obtained samples were compared before and after annealing. It was shown that after heat treatment, the mechanical properties of the stainless steel–carbonitride composites improved due to the diffusion of titanium carbonitride particles into stainless steel. Addition of microsized titanium carbonitride powders was found to be effective to improve the mechanical properties, such as microhardness and compressive strength, of the composite. However, addition of nanosized titanium carbonitride powders led to an increase of corrosion resistivity of the composite. Physical properties, such as thermal and chemical stability of the obtained composite samples were investigated by microhardness tester, potentiostat, field emission-scanning electron microscope, EDX and X-ray diffraction.

Fabrication and Characterization of Amine Compounds Synthesized from Carbon Dioxide and Ammonia Water Using Transition Metal Doped TiO2

Capture and reforming fume gases from atmosphere became an ultimate task recently. Photocatalytic reduction to useful compounds is a key to the future. Photoinduced reduction of carbon dioxide and ammonia aqueous solution into amine compounds at room temperature and atmospheric pressure using transition metal doped titanium dioxide is reported in this paper. UV-visible spectra showed a high absorbance at 200 nm wavelength which is a characteristic of urea. High Performance Liquid Chromatography revealed presence of amine compounds and urea was found a main product of photocatalytic reaction.

A study on the photosynthesis of formic acid using iron-doped titanium dioxide

Abstract Formic acid has attracted much interest owing to potential use in the direct formic acid fuel cells. Photosynthesised formic can be used as a hydrogen carrier because it is liquid at standard temperature and pressure. It is much safer and easier for handling and storing than hydrogen. It can be directly fed to the fuel cell and does not need to be reformed. In this paper, formic acid was artificially photosynthesised in a photocatalytical reactor by using iron ion-doped TiO2. Water was used as a hydrogen source. CO2 was introduced by using continuous bubbling. Highest formic acid yield was obtained at 600 W visible light irradiation by using a 3 g L−1 photocatalyst load and a 5 L min−1 CO2 gas flow rate at continuous stirring. The resultant acid was characterised by using UV–visible absorbance spectrophotometer.

Synthesis, Characterization and Functionalization of the Coated Iron Oxide Nanostructures

The iron oxides nanoparticles and iron oxide with other compounds are of importance in fields including biomedicine, clinical and bio-sensing applications, corrosion resistance, and magnetic properties of materials, catalyst, and geochemical processes etc. In this work we describe the preparation and investigation of the properties of coated magnetic nanoparticles consisting of the iron oxide core and organic modification of the residue. These fine iron oxide nanoparticles were prepared in air environment by the co-precipitation method using of Fe 2+ : Fe 3+ where chemical pre- cipitation was achieved by adding ammonia aqueous solution with vigorous stirring. During the synthesis of nanoparti- cles with a narrow size distribution, the techniques of separation and powdering of nanoparticles into rather monodisperse fractions are observed. This is done using controlled precipitation of particles from surfactant stabilized solutions in the form organic components. It is desirable to maintain the particle size within pH range, temperature, solution ratio wherein the particle growth is held at a minimum. The iron oxide nanoparticles can be well dispersed in an aqueous solution were prepared by the mentioned co-precipitation method. Besides the iron oxide nanowires were prepared by using similar method. These iron oxide nanoparticles and nanowires have controlled average size and the obtained products were investigated by X-ray diffraction, FESEM and other methods.

Synthesis and Characterization of CIS Thin Film Using Chloride Solution

 Abstract—In this study, manufacturing cost reduced for CIS precursor solution from chloride series CuCl2, InCl3, GaCl3 mixed with acetone solvent without binder was discussed. CIS thin films were coated on a substrate using this precursor solution prepared at normal temperature and pressure by Doctor Blade method. We observed that CIS crystals began to form on the surface at 300° C and the surface and internal faults were growing with increasing the temperature. The intensity of main peak increased in CIS absorber layer.

Comparison Characteristic of Large Area Graphene Films Grown by Chemical Vapor Deposition with Nano-Graphite Structures

an attractive material for a wide variety of applications in nano-electronic. Various techniques have been developed to produce graphene to realize its potential applications. Chemical vapor deposition (CVD) of graphene films on Cu substrate is a primary technique for high quality graphene synthesis. In this work we demonstrate the growth of large area graphene layers by chemical vapor deposition (CVD) on copper substrates. Graphene growth was achieved by the flow of methane and hydrogen gasses over a copper thin film acting as catalyst at ambient pressure. Optimal growth conditions were found by varying the different parameters. A transfer process was carried out through treatment with a nickel etchant solution to isolate the graphene with using polymer bond for placement on an oxidized silicon substrate. Transfer methods are essential for effective optical contrast and SEM microscopy measurements. Characterization was performed with optical microscopy, Raman spectroscopy, XRD, SEM and other to determine the quality of layers.

Artificial Photosynthesis of Formic Acid Using Iron Doped TiO2

Formic acid has attracted much of interest due to potential using in Direct-formic acid fuel cells. Photosynthesized formic can be used as the hydrogen carrier because it is liquid at standard temperature and pressure. It is much safer and easier for handling and storing than hydrogen. It can be directly fed to the fuel cell and not need to be reformed. In this paper formic acid was artificially photosynthesized in photocatalytical reactor using Iron ion doped TiO2. Water was used as a hydrogen source. CO2 was introduced using continuous bubbling. Highest formic acid yield was obtained at 600W visible light irradiation using 3g/L photocatalyst load and 5L/min CO2 gas flow rate at continuous stirring. Resulted acid was characterized using UV-visible absorbance spectrophotometer and gas chromatography (GC).

Effect of TiH2 Composition on Porous Stainless Steel and Titanium Hydride Composite Synthesized by Spark Plasma Sintering

The main aim of this research was to investigate the influence of processing parameters on the me-chanical properties and morphology of porous STS:TiH2 composites made by using spark plasma sintering method. Mechanical parameters and structural analysis of the fabricated composite have been investigated by Rockwell hardness, density tester, optical microscope, XRD and FE-SEM. In particular the porous stainless steel (STS) and titanium hydride TiH2 composites materials with op-timal ratio were prepared with using additional hollow glass microsphere and water glass for con-trolling of the porosity degree. It is found, that the porosity degree depended on addition of TiH2 and hollow glass additive, resulting to modification of the pore shape and size. I was shown that the dispersion of STS/TiH2 composite which sintered by spark plasma sintering method without pressure result to increasing of mechanical properties (hardness and density). According to obtained results, the addition of TiH2 powder into STS improves the mechanical property of the synthesized specimens especially the specimens with addition 20 wt% and 50 wt% of TiH2 demonstrated high hardness values and good density.