Materials Literature
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Fuels for future fast reactors will not only produce energy, but they must also actively contribute to the minimisation of long lived wastes produced by these, and other reactor systems. The fuels must incorporate minor actinides (MA = Np, Am, Cm) for neutron transmutation into short lived isotopes. Within Europe oxid…
Mullite ceramics have been known as the engineering materials due to their special properties such as high refractoriness, good thermal shock resistance, low thermal expansion, good strength at low and high temperatures, good creep resistance and low dielectric constant. In the present work, mullite samples were prepa…
Cordierite Mg2Al4Si5O18 is a material for diesel particulate filters (DPF) with high potential. Its resistance to a simplified model ash has been tested on single crystals at temperatures up to 1050°C, which are realistic for use under ‘worst case’ conditions. A mixture of Ca, Mg and Zn phosphates, which are typical m…
A zirconium tungstate (ZrW2O8) precursor was synthesized by a novel sol-gel method with zirconium oxychloride and tungstic acid as the zirconium and tungsten sources, respectively. Heat treatment at 600oC for 10 hours was adequate to crystallize the precursor. Use of excess zirconium source and the concentration of hy…
The new high-strength stainless steels alloyed by copper and nitrogen and possessing high resistance to corrosion by active micro-organisms in carbon-oxidizing, heterotrophic and sulfate-regenerating bacteria mediums are developed. The introducing of small addition of nitrogen (about 0.22 %) to the corrosion resistant…
Ferrite is popular as a core material for RF transformers. Since transmission characteristics of RF transformers are affected by the core’s permeability, which has a large temperature dependence, the development of a method for measuring the core permeability temperature profile is important. In this study, a temperat…
Dendrimers are highly branched organic macromolecules with successive layers or “generations” of branch units surrounding a central core. We show that tinchlorides complexes to the imines groups of a spherical polyphenylazomethine dendrimer in a stepwise fashion according to an electron gradient, with complexation in…
A survey of the organic chemistry literature for the past 50 years shows that graphene nanoribbon type molecules of only one benzene ring width, both with armchair (sexiphenyl) and zig-zag (hexacene) edges have been produced. The variation of the band gap of these molecules with the number of constituent aromatic ring…
Gold nanorods (GNRs) were deposited in ordered mesoporous silica SBA-15 by a liquid-phase synthesis. The X-ray diffraction pattern of GNRs-deposited SBA-15 (GNRs/SBA-15) confirmed that the mesoporous structure of the SBA-15 was maintained even after depositing GNRs in the SBA-15 pores. Laser irradiation and heat treat…
The object of the research was to compare the corrosion resistance of three types of multioxide technical ceramics in hydrofluoric acid containing aqueous media according to a full factorial experimental plan with pH and fluoride ion concentration as variables. The samples were a silicon carbide doped aluminum silicat…
This chapter contains sections titled: Introduction Equations of Motion Jellium Model for a CDW Current Effects of an Applied Electric Field CDW Acceleration and Effective Mass Conclusion Appendix
This contribution aims to provide a general overview of the potential of ceramic materials in several areas related to energy production and storage. Ceramic materials for both low and high temperature fuel cells are examined in some detail. Engineered, porous, ceramic support loaded with noble metals are particularly…
Shaped catalyst is much more practical than powder catalyst when the material is intended to technological applications. Nevertheless, shaping a reactive powder catalyst is not evident, loss in reactivity occurring by e.g. decreasing specific surface area. Addressing such problem has been our objective. The present pa…
The transport properties of Zn0.88-xMgxMn0.12O/ZnO modulation-doped heterostructures (x≤0.15) were investigated. The heterostructures were fabricated on ZnO single-crystal substrates by a pulsed laser deposition system. Atomic force microscope observation and X-ray diffraction analysis suggested that Zn0.88-xMgxMn0.12…
The mismatch of the coefficient of the thermal expansion (CTE) is one of the main causes of crack initiation and delamination for carbon fiber-reinforced polymer hybrids and metal/polymer hybrid materials. In this research, a negative CTE ceramic material (zirconium tungstate) was incorporated with a thermoset polymer…
Ti–Si–C coatings were formed at room temperature on AISI 316L steel substrates by dual beam ion assisted deposition technique from single compound Ti3SiC2 target. Scanning and transmission electron microcopy method were used to examine as-deposited coatings. Their morphology was smooth and dense and their thickness we…
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A multi-components multi-layer co-fired ceramic varactor with superior performance is here presented. The concept combines a tunable capacitor with optimized properties in a restricted temperature range with PTCR layers to control the overall device temperature. Different prototypes are produced as demonstrator units;…
Bone exhibits hierarchical levels of organization from macroscopic to microscopic to nanoscale. The objective of this work was to develop a bonemimetic composite matrix to provide structural support to the regenerating region and to support the cascade of osteogenic differentiation of progenitor marrow stromal (BMS) c…
By Raman spectroscopy we provide direct evidence for successive exchange of D atoms in the tetrahedral BH4 units of the molecular solid lithium borohydride. We prove the coexistence of all isotopomers by deconvolution of the D-stretching vibrations band of Raman spectra at 83 K and 5 K in partially D-exchanged LiBH4 a…