Materials Literature
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Phenols and naphthols were oxidized to the corresponding quinones using 60% p/V hydrogen peroxide and a substituted vanadium Keggin heteropolyacid (H4PMo11VO40.12H2O, HPA) as catalyst. The reactions were carried out at room temperature using acetone as solvent. This procedure was a mild and effective alternative for t…
This paper presents a numerical study of the failure response of an aircraft engine containment panel obliquely impacted by a titanium turbine fragment. A three-branch Bao-Wierzbicki fracture criterion is first calibrated for the target material (2219-T851 aluminum alloy) by performing tensile tests on round bars and…
The performance of single wall carbon nanotube field effect transistors (SWNT FETs) is greatly affected by the quality of its contacts. The presence of Schottky barriers imposes a strong scaling of the gate dielectric thickness. Here, we employ large diameter SWNTs in order to fabricate ohmically contacted FETs when a…
Structure and phase composition of cast high-chromium high-speed steel alloyed by tungsten, molybdenum, vanadium, and boron are studied. The results of metallographic, electron microprobe, and X-ray diffraction analyses of cast and heat-treated alloyed steels are discussed. The phase and chemical compositions of the s…
Unsolvated aluminum hydride has been synthesized by the “direct” reaction of aluminum bromide or sulfuric acid with an alkali metal tetrahydroaluminate at 90–102°C in pure toluene or in toluene containing 5–10 wt % diethyl ether. The reaction involving aluminum bromide yields a mixture of unsolvated aluminum hydride p…
The capacitance aging of multilayer ceramic capacitors (MLCCs) based on BaTiO 3 dielectrics under DC electric fields has been studied. At a DC field of 1 V/µm, the capacitance of MLCC specimens decreased immediately in a very short period (<10 s, the first stage) and then decreased continuously with time (the second s…
Amorphous Ru(P) films grown by chemical vapor deposition at 575 K using a single source precursor, cis-RuH2(P(CH3)3)4, or dual sources, Ru3(CO)12 and P(CH3)3 or P(C6H5)3, are studied. The phosphorus percentage affects the film microstructure, and incorporating &gt;13% P resulted in amorphous Ru(P) films. While cod…
If hot-rolled 40X steel bar is prepared for cold upsetting by the energy-saving technology here proposed, the production costs of the resulting bolts will be reduced.
Abstract The Charpy test is used throughout the world in a wide range of industries because of its low cost and the fact that notching and dynamic loading produces a crack tip stress field that is conservative for many applications. As a result of its widespread use, there is a compelling motivation to extract as much…
A theoretical model is proposed for the collective migration of two neighboring grain boundaries (GBs) in a nanocrystalline material under applied elastic stress. By analyzing the change in the energy of the system, it is shown that GBs can remain immobile or migrate toward each other depending on the values of the ap…
Abstract A new volatile organic compound (VOC) combustion catalyst of 0.1%Pt-0.5%Pd/stainless steel wire mesh (SSWM) was prepared via anodic oxidation treatment. The result of activity tests for complete oxidation of toluene, acetone, and ethyl acetate showed that 0.1%Pt-0.5%Pd/stainless steel wire mesh catalyst had g…
The lowest-energy structures and the electronic properties of Cd n S n ( n = 1–8) clusters have been studied by using density-functional theory simulating package DMol 3 in the generalized gradient approximation (GGA). The ring-like structures are the lowest-energy configurations for n = 2, 3 and the three-dimensional…
The reaction properties of Rh/TiO2 sodium tetrahydroborate hydrolysis catalysts reduced directly in the reaction medium depend on the temperature at which they were calcined. Raising the calcination temperature to 300°C enhances the activity of the Rh/TiO2 catalysts. Using diffuse reflectance electronic spectroscopy,…
CVD-diamond deposition onto steel substrates has been an important aim of research projects. The combination of the unique surface properties of diamond with steel as the most common substrate material would generate a new solution for machine parts with extreme loads by friction and wear. In this work the influence o…
Abstract Summary: Two different approaches to obtain electron donor‐acceptor interfaces via self‐assembly of block copolymer systems are discussed, where the donor domains are formed by a π ‐conjugated rod‐like polymer and the acceptor domains result from a coiled polymer modified by C 60 fullerenes. In the first stra…
We studied the effect of quantum confinement in Mn-doped InAs nanocrystals using theoretical methods. We observe that the stability of the impurities decreases with the size of the nanocrystals, making doping more difficult in small nanoparticles. Substitutional impurities are always more stable than interstitial ones…
Eu 3+ -doped tellurite glass of molar composition: TeO 2 + K 2 O + Nb 2 O 5 + Eu 2 O 3 (TKN1Eu) has been prepared by quenching the oxidic melts. The emission spectra and the decay curves for the 5 D 0 level of Eu 3+ ions in TKN1Eu glass have been measured and analyzed as a function of pressure up to 14.8 GPa at room t…
We have demonstrated the fabrication and characterization of hybrid CdSe-ZnS quantum dot (QD)-InGaN-GaN quantum well (QW) red light-emitting diodes (LED). The red-emitting QD-resin blend was dropped on the InGaN blue LED to complete the device fabrication. With proper blend ratio, the blue light from the InGaN QWs can…
CdS/PbS core−shell nanoparticles are grown via ion-exchange reaction route. Devices based on such nanoparticles exhibit electrical bistability and memory phenomena. We show that the bistability is due to charge confinement in the nanoparticles. Here, although the low-bandgap material allows facile carrier injection fr…
The flammability and the thermal oxidative degradation kinetics of expandable graphite (EG) with magnesium hydroxide (MH) in flame‐retardant polypropylene (PP) composites were studied by limiting oxygen index (LOI), UL‐94 test, and thermogravimetric analysis (TGA). The results show that EG is a good synergist for impr…