Materials Literature
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Carbon fibers are oxidized in two electrolytes at different electrolyte concentrations and potentials. The chemical composition of the fiber surface changes considerably in both cases. The oxidation in H2SO4 results in the formation of sulfur containing groups, but quinoidal compounds are also detected on the surface.…
Measurements of dielectric properties (a real part of dielectric permittivity and a dielectric loss tangent tan in the microwave range (0.5-2.5 GHz) at room temperature and at temperatures from room one up to 490 K at microwaves have been carried out in the BiFeO3-SrTiO3 system. Both and tan maximum values (sigma = 53…
ZnO quantum dots were prepared by the reaction of Zn2+ with OH— in alcoholic solution. By annealing (150–500 °C), both the particle size and the surface conditions could be changed intentionally. The structural properties of the dots were characterized by X-ray diffraction and Raman measurements, and the optical prope…
This work reports on the synthesis of tin and germanium phthalocyanine complexes containing phenoxy and substituted phenoxy groups as phthalocyanine ring substituents. The compounds studied are: dichlorogermanium phthalocyanine complexes containing eight phenoxy (4a), o-methyl phenoxy (4b) or estrone (4c) groups on th…
Pr 3 + -doped YF 3 , LiCaAlF 6 , and LiSrAlF 6 polycrystalline samples were prepared and investigated by means of high energetic excitation with synchrotron radiation. In the emission spectra, bands due to the intraconfigurational 1 S 0 → 4 f 2 transitions were observed. Simultaneously observed emission bands due to 4…
The book summarizes the history and current status of the development of gas turbine engines and ancillary equipment using ceramic hot section components. Specifically, the book focuses on the evolution of component and engine designs, and the demonstration of design concepts through rig and engine testing of the cera…
Emulsification of vegetable oil-based resins was a daunting task when the author began his research, but the subsequent technology spawned a generation of stable emulsions for waterborne coatings base
Abstract Nanocrystals of metals covered by alkanethiols organize themselves in two-dimensional arrays. We discuss such arrays of metal nanocrystals at length, with focus on the dependence of the structure and the stability of the arrays on the particle diameter and the distance between the particles. Three-dimensional…
Atomic force microscopy (AFM) was used to examine the surface structure of self-assembled films obtained from water-soluble chitosan rich solution precursor. The film was supported onto functionalized glass slides resulting in a mountain-and-valley structure. This feature is attributed as resulting of the experimental…
Stable icosahedral quasicrystals with wide composition ranges have been found in the systems Cd-Mg-Yb and Cd-Mg-Ca. The icosahedral quasicrystals form in the following composition ranges: 25-85at.%Cd, 0-60at.%Mg and 10-20at.%Yb for the Cd-Mg-Yb system; 33-85at.%Cd, 0-52at.%Mg and 10-20at.%Ca for the Cd-Mg-Ca system. A…
The X-band ( x ; 9.4 v GHz) electron spin resonance (ESR) spectra of the un-doped isotopically enriched lithium tetraborate (LTB) Li 2 B 4 O 7 single crystals, irradiated by thermal neutrons (fluences | n =2.74 ‐ 10 15 1 1.79 v ‐ 10 18 v cm m 2 ) were investigated at 300 and 77 v K. The LTB crystals of high chemical p…
The local structure of the iron centres in the as-synthesised and calcined FAPO-5 and FAPO-18 catalysts has been investigated using a combination of techniques, including X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Mössbauer spectroscopy and computational modelling.…
A self-assembled thin film edge emitter has been fabricated. The unique fabrication process requires only a tetrahedral amorphous carbon (ta-C) thin film with one photolithography step to generate a three-dimensional structure. A high emission site density was achieved compared with that obtained from a flat ta-C film…
The phase relations and equations of state of ZrO 2 and HfO 2 high-pressure polymorphs have been investigated by means of in situ observation using multi-anvil type high-pressure devices and synchrotron radiation. Baddeleyite (monoclinic ZrO 2 ) transforms to two distorted fluorite (CaF 2 )-type phases at 3-4 GPa depe…
A carbon-supported platinum electrocatalyst was modified with molybdenum using surface organometallic chemistry. The catalyst was characterized using transmission electron microscopy, cyclic voltammetry (CV), polarization studies, and in situ fluorescence extended X-ray absorption fine structure (EXAFS) studies. The C…
The structural characterization of drug substances by X-ray diffraction plays a central role during the development of pharmaceuticals. While powder diffraction is usually employed for the identification of solid phases, the single crystal technique yields detailed structural information, which is needed for purity co…
The paper presents the X-ray photoelectron spectra (XPS) of the valence band and core levels of semiconductor ferroelectric Sb2S3 single crystals, which show weak phase transitions and anomalies of various physical properties. The XPS were measured with monochromatized Al K α radiation in the energy range 0-1450 eV an…
This paper describes the manufacture and testing of polymer matrix Terfenol-D particulate composites fabricated with a [112] preferred crystal orientation. The results demonstrate that crystal orientation permits higher saturation strain than previously obtained in particulate composites. Oriented particle composites…
The flexural properties of 2D plain-woven Hi-NicalonTM fiber reinforced SiC/SiC composites with various PyC and PyC-SiC multilayers were studied at ambient temperature. The composites were fabricated by chemical vapor infiltration process (CVI). The interlayers were deposited by isothermal CVI process from methane for…
The Behavior of Polypyrrole-Coated Electrodes in Propylene Carbonate Solutions : I. Characterization of PPy Films by a Combination of Electroanalytical Tools and XPS, Levi, M. D., Lankri, Eli, Gofer, Y., Aurbach, D., Otero, T.