Materials Literature
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The magnesium oxysulfate whisker/ABS composites were prepared by making the magnesium oxysulfate whisker as dispersed phase.Scaning electron microscope(SEM) was used to test the distribution of whiskers in ABS matrix.Effect of the surface modification and the amount of whiskers to the mechanical properties of composit…
Fe-Cu-C sintered steels are widely used for automobile parts. However, low-cost Cu free general-purpose sintered steels are also required from the viewpoint of recycling because Cu in steels deteriorates their properties. In this study, Mn and Si were selected as new strengthening elements to replace Cu and the effect…
Mixed oxides with the perovskite-like structure, possessing mixed electronic and ionic electrical conductivities, are proposed for dense ceramic membranes production for both oxygen separation and oxy-combustion processes. In the study three perovskite-type mixed oxides La0.6Sr0.4Fe0.8Co0.2O3+� (LSCF), Ba0.5Sr0.5Co0.8…
In this paper we present some results regarding undoped and doped ZnO thin films deposited on various substrates like glass, silicon and kapton by rf magnetron sputtering. The influence of the amount of aluminum as well as the usage of different substrates on the final photovoltaic properties of the thin films is stud…
ZnO thin films were fabricated by the sol‐gel method using Zn(CH3COO)2.2H2O (zinc acetate) as starting material. A homogenous and stable solution was prepared by dissolving the zinc acetate in a solution of ethanol and ethanolamine. Deposition of ZnO solution on Si substrate was performed by spin‐coating technique and…
M‐type Barium Magnesium hexaferrite with the composition BaMg2Fe10O19 was successfully prepared with and without surfactant by using a citrate precursor route. The obtained precursors were calcined at various temperatures. The crystalline structure, phase analysis and particle size were investigated by using X‐ray dif…
Temperature-dependent μ-photoluminescence of self-trapped exciton (STE)-based radiation in Si nanocrystals (Si-nc's) with sizes enlarging from 2.3 to 4.5 nm is demonstrated, while the monotonically decreasing trend of the STE activation energy (from 1.75 to 1.2 meV) with Si-nc size-dependent dielectric permittivity is…
It is shown that the nonexchange sorption of phenylalanine on dissimilar anion exchangers occurs by the same mechanism, determined by the structure of the amino acid, while the absorbed amount of substance depends on the sorbent structure. It is established that the micelle formation and the phenylalanineanion exchang…
A self-assembled monolayer (SAM) technique was employed to produce carbonate apatite (CA) coatings onto Ti substrates after sulfonation. The Ti substrates thus treated (S-SAM-Ti) were immersed in metastable calcium phosphate solutions containing carbonate to induce precipitation of carbonate apatite on the surface. Th…
Several methods have been developed for producing high-porosity open-cell metal foams, but no method is available for producing closed-cell type metal foams with a porosity of more than 95 %. We therefore developed a novel process for producing a high-porosity closed-cell metal foam using a hydro-gel binder. This proc…
In this study, a thin (less than 1 micrometer) interlayer of gadolinia doped ceria (GDC) was applied by aerosol deposition (AD) process between YSZ electrolyte and LSCF-GDC composite cathode. The GDC interlayer was co-fired with the cathode without an additional heat treatment step. Performance of the cells with the G…
Amorphous carbon (a‐C) thin films were deposited by thermal chemical vapor deposition (CVD) using camphor oil on quartz substrates. The photoconductivity and optical properties of the thin films were studied with varying the deposition temperatures ranging from 650 to 900 °C. The film deposited at 750 °C shows large p…
This paper presents direct growth of horizontally aligned carbon nanotubes (CNTs) between two predefined various inter-spacing up to tens of microns of electrodes (pads) and its use as CNT field-effect transistors (CNT-FETs). The catalytic metals were prepared, consisting of iron (Fe), aluminum (Al) and platinum (Pt)…
The relationship between hydrogen embrittlement and temper embrittlement of 2.25Cr-1Mo steel was investigated by Auger electron spectrometer testing and electrochemical hydrogen charging. The results indicate that atomic hydrogen increases the grain boundary concentration of impurity element P and temper embrittlement…
We have recently developed design and fabrication techniques that provide refractive diffusers with true bandlimited performance. We discuss design principles, comparison with alternate diffuser technologies, fabrication, testing, and some applications of bandlimited diffusers.
One of the most popular methods for producing nanostructures on solid surface is laser ablation. The experimental results of ultrashort pulses laser interaction with metals and carbon are presented. Our femtosecond laser system generates pulse trains with Epulse=1 mJ, pulse duration Tpulse=50 fs and repetition rate fr…
The main aim of this work is to investigate experimentally the influence of ultrasonic waves, on the heat transfer enhancement, from a stainless steel circular cylinder to distilled water, in subcooled boiling conditions. This study has carried on for a few years at the Department of Energetics “L.Poggi”. The effect w…
Improved oxygen diffusivity is essential for reducing mass transport losses in polymer electrolyte fuel cells (PEFCs). In this work, effective oxygen diffusivity in the presence of liquid water inside a gas diffusion layer (GDL) was investigated by means of coupled experimental and numerical analyses. In order to cont…
Silicon powder was encased within carbon gel microspheres with different porosities by simply adding silicon powder to the water phase during the inverse emulsion polymerization of resorcinol with formaldehyde, followed by drying and carbonization. From the results of charge-discharge experiments, it was confirmed tha…
At Japan Atomic Energy Agency (JAEA), a MeV accelerator has been developed to demonstrate acceleration of H− ion beams at the ITER-relevant power density. After long pulse beam acceleration tests of up to 10 s, molten areas were observed around the apertures of the grids due to excess heat load on the grids. To identi…