Materials Literature
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The mechanical properties of advanced SiC/SiC composite and polycrystalline, monolithic β-SiC under dual- and triple-ions irradiation to 1 and 10 dpa at 800°C, 1000°C, and 1300°C were investigated by a Nano-indentation test. Preliminary microstructural analysis by transmission electron microscopy was performed. Hardne…
Reaction of a freshly prepared Ni(OH)2−2 x (CO3) x ·yH2O with maleic acid in H2O at room temperature afforded [Ni(H2O)6][Ni(H2O)2(C4H2O4)]·4H2O, which consists of [Ni(H2O)6]2+ cations, [Ni(H2O)2(C4H2O4)]2− anions and lattice H2O molecules. Ni atoms in cations are octahedrally coordinated and Ni atoms in anions are eac…
Density and refractive index measurements in the discotic liquid crystal hexaheptyloxytriphenylene were performed in the hexagonal columnar Colho and isotropic I phases. The temperature dependence of the density ρ(T) for this compound was obtained by combining small angle X-ray data and capillary methods. The ordinary…
Frequency domain PD testing offers a rich set of PD characterization tools, the most basic of which are described in the article. PD detection sensitivity under field conditions is one to two orders of magnitude greater than for time domain testing as a result of (i) no need to trigger on the first PD pulse above the…
One of the clear visions of microelectronic device engineering has been to replace the thermal cathode by a “cold” emitting cathode. The main advantages of using a cold cathode are that it is smaller and consumes less energy than its thermal counterpart. For a long time the main obstacle to designing such a device was…
Abstract The preparation of nanoparticle suspensions was carried out by using commercial biodegradable polymers as poly(d,l‐lactide), poly(d,l‐lactide‐ co ‐glycolide) and poly(d,l‐lactide‐ co ‐ϵ‐caprolactone). The method of preparation was based on the controlled addition of polymer organic solution to an aqueous phas…
Fusion enthalpies were measured by differential scanning calorimetry (DSC) for mineral mixtures of eutectic composition in the systems anorthite-diopside (An 42 Di 58 , wt%), anorthite-akermanite (An 46 Ak 54 ), akermanite-diopside (Ak 42 Di 58 ), diopside-silica (Di 84 Qt 16 ), and anorthite-diopside-forsterite (Di 4…
This book is one of the eleven volumes of the ''Encyclopaedia of Electrochemistry'' and provides both an introduction to the different fields of corrosion as well as a detailed overview of the subjects. The volume is divided into seven main chapters each of them containing some special papers written by well known spe…
A new process has been developed for the synthesis of nanocrystalline AlN powder by the nitridation of coarse aluminum powder in flowing NH 3 gas, using NH 4 Cl and KCl as additives. The resulting powders have been characterized using XRD, TEM, and XRF techniques. XRD‐pure AlN nanoparticles with a diameter of 10–20 nm…
Theoretical calculations have been performed and applied to determine the most likely geometry for the pyrosulfate ion. The main question was to determine as to whether the system has C 2 or C 2 v conformation. The present study favors C 2 symmetry. Bond lengths and angles have been calculated for the isolated ion, an…
Silicon oxide (SiO x ) and silicon nitride (Si x N y ) thin films of different thicknesses were deposited on the polyimide (PI, Kapton HN) film surfaces via plasma-enhanced chemical vapor deposition (PECVD). The silica films were prepared from two types of gaseous mixtures, including (1) tetraethyl orthosilicate (Teos…
We have suggested an atomic layer deposition (ALD) method for preparing W–N films on Si and non-Si surfaces by using WF6 and NH3. It is very difficult to deposit W–N films with sequential exposures of WF6 and NH3 because WF6 either reacts with Si quickly due to the catalytic reaction of Si, forming a thick W layer ins…
Abstract Raman spectroscopy was applied to monitor the growth of diamond in different plasma‐assisted chemical vapour deposition reactors. A gated, multichannel detection system was used to discriminate against the high level of background radiation produced by the plasma and the hot substrate. As a result, Raman spec…
Abstract The interaction between collagen and organometallic aluminum complexes was studied. From the analysis of the IR and UV spectra, the viscosity of collagen, and the treated collagen, a possible interaction model of the collagen with the aluminum tanning agent has been found. It indicates that such an aluminum t…
We propose using ion-beam etching as an additional tool for the accurate control of the thickness of thin films during the manufacture of sensitive optical multilayer coatings. We use a dual ion-beam sputtering system in the deposition and etch modes. In the deposition mode both the assist and sputtering ion beams are…
Polymorphism in barium gallate BaGa2O4 was studied using electron diffraction and high resolution electron microscopy. Three modifications of BaGa2O4 with structures closely related to the high-temperature α-form were observed. The phase transitions from γ-BaGa2O4 (a γ = 18.6143(2) Å = 2<formula><radical><radicand>3</…
In this work we have explored the possibilities to create layered organizations of the Mn 12 single-molecule magnets using the Langmuir–Blodgett technique or attaching these clusters onto a metal surface by preparing self-assembled monolayers (SAMs). In the first part we discuss the use of the Langmuir–Blodgett (LB) t…
Abstract A novel tert ‐butyl‐containing dianhydride was prepared from readily available reagents. It was reacted with various aromatic diamines to prepare a set of polyimides containing tert ‐butyl pendent groups. The resulting polyimides exhibit high molecular weights (high inherent viscosity), and a combination of d…
Abstract Raman spectroscopy is a powerful tool for the study of solids under extreme conditions of pressure and temperature. This technique can be used to determine phase diagrams and study phase transition mechanisms. Raman spectroscopy can be used to characterize disorder present in crystalline solids and is sensiti…
β-4-(N-Tert-butyl-N-aminoxyl)-1,1‘-biphenyl-3‘,5‘-dicarboxylic acid forms stacked, intercalated, 1-D hydrogen-bonded chains whose nitroxide groups interact with m-phenylene C−H bonds of neighboring radicals, yielding chains of NO···HC close contacts perpendicular to the hydrogen-bonded chains. The latter chain appears…