Materials Literature
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A SiC powder of median size 0.8 μm was mixed with polyacrylic acid (PAA, dispersant) in a 0.3 mol/l-R(NO3)3 solution (R=Yb, Y, Gd, Sm, Nd and La) at pH 5 to adsorb uniformly the sintering additive (R3+ ion) on the SiC surface. The aqueous 30 vol% SiC suspension with 0.52 mass% PAA and 1.50 mass% R2O3 (as R(NO3)3), rel…
The study deals with changes in clay mineral associations with soil development and related implications for land users in the Lusikisiki area of the Eastern Cape Province of South Africa. Fifteen profiles, encompassing all major soil forms in the region, were investigated. The pedons developed from pre-Jurassic sedim…
This paper, a review of the state of the art of the drying process in wet porous media, presents an overview of thermodynamic relations in heat treatment of synthetic fiber fabrics. Heat and mass transfer in wet porous media are coupled in a very complicated way. The structure of the solid matrix varies widely in shap…
Abstract Density functional theory (DFT) calculations were carried out to characterize the optimal site of the protons and the precise protonation state in the polyoxometalate (POM) anions [V 13 O 40 ] 15− and [H 12 V 13 O 40 ] 3− . Six kinds of possible protonated stable isomers with the whole Keggin anion units are…
Acoustic waves at the interface between a polymeric solid and a glass-forming liquid are studied through impulsive stimulated thermal scattering (ISTS), a photoacoustic method. The transverse character of the interface waves provides a unique window into the shear relaxation dynamics of supercooled liquids. Real and i…
The effect of annealing at 1400 ˚C in argon on the bond structure of graphite ball milled for 100 h at 400 rpm in polar (water) and in non-polar (n-dodecane) liquids was investigated primarily by near-edge X-ray absorption fine structure spectroscopy (NEXAFS) and transmission electron microscopy (TEM). Carbon K-edge N…
Diels-Alder reaction of ethynyl p-tolyl sulfone with 1,3-dienes gave the corresponding tosyl-1,4-cyclohexadienes. The resulting adducts could be converted into 4,7-dihydro-2H-isoindole derivatives including bicyclo[2.2.2]ocatadiene(BCOD)-fused pyrrole as an isoindole equivalent.Tetrabenzoporphyrin and its derivatives…
It was found that the lower photoluminescence of hydrothermal under excitation is mainly due to the presence of . The electron paramagnetic resonance spectra confirmed the existence of in hydrothermal , and the was difficult to eliminate completely by calcination in air. The emission spectra showed the induced redunda…
In order to evaluate the deterioration characteristics during the lifecycle of bridge rubber bearing, a series of long-term accelerated exposure tests are performed on four kinds of rubber materials widely utilized for bridge bearings. Different degradation factors are applied in these tests, such as thermal oxidation…
A thermoelectric generator (TEG) usually works in dynamic operating conditions due to the time change, in real applications, of the electric load and hot or cold temperatures. Thus understanding transient thermal and electrical behavior of the device, besides the steady-state behavior, is important in order to investi…
Improvement of Electromigration Lifetime of Submicrometer Dual-Damascene Cu Interconnects Through Surface Engineering, Vairagar, A. V., Gan, Zhenghao, Shao, Wei, Mhaisalkar, S. G., Li, Hongyu, Tu, K. N., Chen, Zhong, Zschech, E., Engelmann, H. J., Zhang, Sam
The corrosion of pure chromium was studied in four molten glasses, using both scanning electron microscopy and electrochemical methods to characterize the metal/glass interactions. It is shown that direct immersion of chromium into glass does not allow obtaining a protective oxide scale, even if the glass contains oxi…
Pd metal supported on Cs2.5H0.5PW12O40 is an efficient bifunctional catalyst for the one-step conversion of acetone to methyl isobutyl ketone in gas and liquid phase.
Abstract We report on ab initio calculations of the electronic and magnetic properties of metal–benzene sandwiches M n (C 6 H 6 ) m (M = V, Nb, Ta) and infinite wires, obtained by an infinite repetition of metal–benzene half‐sandwiches, based on the density functional theory (DFT) in the generalized gradient approxima…
Reversible switching between intra- to intermolecular electron transfer paths has been accomplished by adding and extracting potassium ions to the supramolecular porphyrin-fullerene conjugates formed by complexing porphyrin functionalized with a benzo-18-crown-6 entity and fullerene functionalized with an alkylammoniu…
We apply self-assembly pattern of diblock copolymers for fabrication of patterned magnetic media. FePt dot arrays with 30 nm center-to-center distance have been fabricated using self-assembled pattern formation of polystyrene-polymethylemethacrylate(PS-PMMA) diblock copolymer. The FePt dot arrays have strong perpendic…
We have synthesized dendrimers of the amino-acid lysine bound to a central poly(ethylene glycol) (PEG) core, and then formed multiple diazeniumdiolate nitric oxide (NO) donors on the lysine residues. NO release from these materials occurred for up to 60 days under physiological conditions. These materials display the…
The non-linear electrical characteristics of a polymeric electrochemically controlled junction based on a conducting polymer (polyaniline) and a solid electrolyte (Li doped polyethylene oxide) are considered as basic features for the realization of smart materials based on the statistical occurrence of such heterojunc…
An engine oil condition sensor based on multiwall carbon nanotubes was fabricated with the screen printing method. Carbon nanotube (CNT) paste was printed between two parallel-aligned electrodes. The conductivity change in the engine oil according to mileage was measured by using CNT oil sensor. The sensor output was…
In order to obtain highly dispersed heteropolyacids (HPAs) species, H3PMo12O40 and H4PVMo11O40 were supported on various supports: silica (Aerosil - Degussa and Romsil types) and TiO2. The structure and thermal decomposition of supported and unsupported HPAs were followed by different techniques (TGA-DTA, FTIR, XRD, l…