Materials Literature
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One of the main challenges in the perspective of a hydrogen economy is the development of a storage system both safe and with high weight capacity. Among the most promising systems are the storage in metals and chemical hydrides and the high pressure storage in tanks made of composite materials. Both these technologie…
Degradation and disintegration of the nickel base cermet anode is a serious problem in direct utilization of hydrocarbon fuels, especially for liquid fuels such as kerosene. Cell operation test was carried out for the SOFC with nickel – scandia stabilized zirconia (Ni-ScSZ) cermet anode by direct feeding of several li…
We studied the electrical transport properties of indium contacted graphene, few layer graphite (FLG) and bulk graphite samples under ambient conditions. Some of the contacted samples showed nonlinear transport characteristics. The initial electrical properties of the samples were changed reversibly by light illuminat…
Polycrystalline ytterbium-doped barium cerate with composition BaCe0.95Yb0.05O3- has been fabricated by solid state reaction. The compound has an orthorhombic perovskite structure and a fine and homogeneous grain size distribution, with a mean value of 0.4 m. The creep behavior was studied by means of constant cross…
The solar furnace is a heating system based on concentrated sunrays on the material surface. It is an original method for testing ultra-high-temperature ceramics (UHTC) at very high temperature (above 2200°C) in air with an exposure time of several minutes. In this study, the solar flux is 15.5 MW.m-2 with a homogeneo…
The microwave resonance absorption at wavelengths 871, 406, 305, and $118\text{ }\ensuremath{\mu}\text{m}$ (frequencies 344, 739, 984, and 2540 GHz) in tetragonal layered perovskites ${\text{HoBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{x}$ $(x\ensuremath{\approx}6.0,6.3)$ in pulsed magnetic fields up to 40 T has been observed…
A dense alumina body with anisotropic grains was fabricated from anisotropic particles (platelets) after heating at 1650°C for 15 min under applying pressure of 60 MPa using a PECS technique. When the alumina was cut on the vertical plane to the load direction while sintering, the breakdown voltage was 15 KV/mm and th…
SiC films were deposited by reactive DC magnetron sputtering of high purity (99.999%) Si target. 3 types of substrates, AISI M2 grade high speed steel, glass and Si (100) wafer were used in each deposition. The effect of different CH4 flow rates on the microstructural properties and surface morphologies were character…
TrpY regulates the transcription of the metabolically expensive tryptophan-biosynthetic operon in the thermophilic archaeon Methanothermobacter thermautotrophicus. TrpY was crystallized using the hanging-drop method with ammonium sulfate as the precipitant. The crystals belonged to the tetragonal space group P4(3)2(1)…
In rocket engine combustion chambers, the cooling channels experience extremely high temperatures and environmental attack. Thermal protection can be provided by Thermal Barrier Coatings. Due to the need of good heat conduction, the inner combustion liner is made of copper. The performance of a standard coating system…
Fuel cell technology has merged in recent years as a keystone for future energy supply. The proton exchange membrane fuel cell (PEMFC) is one of the most promising projects of this energy technology program; the PEMFC is made of a conducting polymer that usually operates at temperatures in the range 20-80°C. In order…
Mesoporous silicon oxynitride and nitride were prepared through nitridation of various mesoporous silica, MCM-41, -48, and SBA-15 with ammonia in a plug flow reactor. The nitrogen contents were dependent on the reaction temperature and the amount of ammonia supplied per sample weight. The appropriate nitridation tempe…
Active researches have been conducted to seek the application of ceramics as structural components. However, the lack of damage tolerance ability has been a critical problem. Laminated composites as one of the main way for improving the brittleness of ceramics are getting more and more attention from the biomimetic po…
To modify the relatively low fracture toughness of monolithic ceramics, the incorporation of long ceramic fibre within a matrix material has been extensively performed. In this case, as cracks form in the matrix material and approach the fibres, they will be deflected at the interface between the fibre and the matrix.…
The Vitrification Test Rig (VTR) is a full scale non-active waste vitrification plant (WVP), that replicates the lines used for immobilising highly active reprocessing waste at Sellafield in the UK. In the high level waste (HLW) vitrification process, liquid HLW is dried in a rotating tube furnace then mixed with an a…
To be used as environmental barrier coatings, yttrium silicates must be thermally and chemically stable at high temperatures, under high pressures in a moist environment. This work proposes a full method to quantify their thermo chemical and mechanical stabilities: (i) in a corrosive environment at high temperature an…
There has been growing interest in developing new semiconducting polymers for applications in optoelectronics (OLEDs) due to their exceptional processability and appealing characteristic of manipulating electronic and optical properties by tuning of molecular structure and self-assembling. This study is an investigati…
The luminescence properties of rare-earth doped Gd4Si2O7N2 with cuspidine structure were examined. The Gd4Si2O7N2 powder, i.e., a host material, was prepared by mechanically mixing α-Si3N4, SiO2, Gd2O3 and rare-earth oxide (activator) powders (in the stoichiometric ratio Si3N4 : SiO2 : Gd2O3 = 1 : 1: 4) by heating the…
Natural tissue, especially autologous tissue is one of ideal materials for tissue regeneration. Decellularized tissue could be assumed as a second choice because the structure and the mechanical properties are well maintained. Decellularized human tissues, for instance, heart valve, blood vessel, and corium, have alre…
Many physical and chemical problems in solid oxide fuel cells (SOFC) are induced by the operating temperature of approximately 800 ~ 1000°C. The focus of the research in SOFC’s is, thus, on running the systems at the intermediate operating temperature range below 800 °C. A way to achieve this includes changing the ele…