Materials Literature
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MPB for repair of concrete was prepared by proportionally mixing burned MgO powder(M) with NH 4H 2PO 4 powder(P) and setting modifying admixtures. It has excellent properties such as rapid setting with high strength, high bonding strength to old concrete and so on. The study was focused on the key factors influencing…
It is well known that water treeing in polyethylene (PE) is sensitive to frequency, but there is not yet a reliable analytic model describing this empirical observation. We show from existing published data that the length L of water trees grown in the laboratory under one given ionic solution varies linearly when plo…
The methods currently used to study the bulk and surface transport properties of insulators usually consist of charging the sample by corona or electrons, and monitoring the natural decay of the surface potential or its buildup after a temporary short circuit (return potential). These measurements have become quite ea…
Copolyimide thin film, which has low-level stress and stress relaxation induced by water sorption, was characterized for potential applications as an encapsulant, a stress-relief buffer, and in interlayer dielectrics. The polyimides examined were poly(p-phenylene pyromellitimide) (PMDA-PDA) and poly(p-phenylene biphen…
For the actively cooled first wall panels of the W7-X stellarator under construction at Greifswald, Germany, boron carbide (B 4 C) coatings with a thickness up to 500 µm are being developed as plasma facing surface on the stainless steel component. Different coating technologies (vacuum plasma spray (VPS), atmospheric…
During the last fifty years blending of dissimilar polymers has been a major path to tailor materials with new properties in industry. Especially in the area of engineering thermoplastic materials this approach has led to a significant number of large volume products, like Polyphenyleneether/High Impact Polystyrene-bl…
Increasing the time allowed for hydrothermal crystallisation during high temperature (150 °C) synthesis of MCM-41 appears to result in some ordering (nanocrystallites) within the pore walls which is accompanied by increase in pore wall thickness, pore size, silica condensation and the formation of elongated or rod-lik…
This work employs X-ray diffraction, X-ray reflectivity, and transmission electron microscopy, along with electrical (sheet resistance and resistivity) and bending-beam stress analyses, to characterize the intrinsic properties and barrier behavior of 40 nm thick thin films of sputter-deposited single-layered Ta 2 N ,…
Domain switching behavior of sol-gel derived PZT thin films at high frequencies has been investigated for ferroelectric memory applications by measuring P-E hysteresis curves as a function of frequency. The coercive field (Ec ) of the PZT thin films strongly depended on the measuring frequency, nevertheless their rema…
This paper considers the perforation characteristics of orthotropic and quasi-isotropic carbon fiber composite laminates struck by a steel ball projectile, both analytically and experimentally. Two analytical models, which are developed on the basis of the conservation laws of momentum and/or energy, are introduced. H…
Reaction of [Fe3(μ3-O)(O2CPh)6(H2O)3](O2CPh) with pyridine yields a product (2) which on recrystallisation rearranges to [Fe6(μ-O)2(μ-OH)2(O2CPh)12(py)2] (3). Magnetic and Mössbauer spectral analyses suggest that compound (2) contains an Fe4(O)2 cluster. The unrecrystallised material (2) reacts with Zr(OBut)4 to form…
The macrocluster formation of propionic acid adsorbed onto silica (glass and silicon oxide) surfaces from propionic acid-cyclohexane mixtures has been studied using surface forces measurement, adsorption excess isotherm measurement and Fourier transform infrared spectroscopy (FTIR) in the attenuated total reflection (…
Using potassium chlorate, sulfuric acid and ferrous sulfate as a catalytic oxidation system to oxidize the aryl substituted carbazide to prepare new type bisazo compounds in one phase have been described for the first time in this paper. Eight bisaryl carbodiazones have been synthesized in high yields under mild condi…
L-Lysine derivatives of viologens form supramolecular assemblies of fibers and ribbons in some aromatic solvents, and the charge separation reaction in these self-assembling systems proceeds with a similar efficiency to the MV2+ system.
Electron and Li ion conducting properties of room temperature sputtered amorphous tantalum oxide films were studied in order to evaluate the feasibility of using in electrochromic device applications. The films were investigated using the galvanostatic intermittent titration technique, impedance spectroscopy, and isot…
Poly(3-hydroxy-5-phenylvalerate) [P(3HPV)] was efficiently accumulated from 5-phenylvalerate (5PV) in Pseudomonas putida BM01 in a mineral salts medium containing butyric acid (BA) as the cosubstrate. A novel aromatic copolyester, poly(5 mol% 3-hydroxy-4-phenylbutyrate -co- 95 mol% 3-hydroxy-6-phenylhexanoate) [P(3HPB…
It is well known that the structures of the organisms give some important hints for the material development. To obtain a new idea on the optimum design of the material structures, the fore-wing of Allomyrina dichotoma was used and its mechanical properties and micro structures were investigated. As a result, the non-…
In Situ processing and microstructure of calcium dialuminate (CaAl4O7)-based porous materials have been investigated. Powder mixtures of CaCO3 and α-Al2O3 (1:2 in molar ratio, doped with 0.5mass% LiF), and CaCO3, α-Al2O3, and ZrO2 (2:2:1 with 0.5mass% LiF) were prepared by a high-energy ball-mill process. Reactions of…
Pyrolytic Carbon Deposition on Porous Cathode Tubes and Its Use as an Interlayer for Solid Oxide Fuel Cell Zirconia Electrolyte Fabrication , Basu, Rajendra N., Altin, Orhan, Mayo, Merrilea J., Randall, Clive A., Eser, Semih
An impedance model for the electrochemical dissolution of lithium in alkaline solutions is presented. The construction technique of the impedance function depends on calibration to steady-state properties, described in Part II of this series. The model, which is based on the point defect model for the growth and break…