Materials Literature
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An integration method for step-scanned single-crystal intensity data based upon fitting of the individual diffraction profiles by a pseudo-Voigt function is presented. Algorithms for both the recovery of weak intensities from data sets and the rejection of aberrant peak profiles are discussed. The ideas presented in t…
In-Plane Orientation and Polarity of ZnO Epitaxial Films on As-Polished Sapphire (α-Al2O3) (0001) Substrates Grown by Metal Organic Chemical Vapor Deposition, Zhang, Bao-ping, Manh, Le-hong, Wakatsuki, Katsuki, Tamura, Kentaro, Ohnishi, Tsuyoshi, Lippmaa, Mikk, Usami, Noritaka, Kawasaki, Masashi, Koinuma, Hideomi, Seg…
High pressure Raman spectra of KNbO 3 –KTaO 3 (KTN) and –NaNbO 3 (KNN) mixed crystals have been measured to study the behavior of the anomalous mode coupling as well as the phase transition and analyzed on the basis of the two-mode coupling model. The anomalous mode coupling has been observed for all samples under pre…
The high resolution transmission electron microscope (HRTEM) observation was carried out to investigate the microstructure of precipitates in a Mg-Gd-Y-Zr alloy. The b{sup ''} and b' phases have co-existed in the peak-aged specimen, and the morphology of their phases was expected as the needle. The interface between t…
\n\t\t\t\t\tRecently magnesium has been recognized as a very promising biomaterial for bone substitutes because of its excellent properties of biocompatibility, biodegradability and bioresorbability. In the present study, magnesium foams were fabricated by using a powder metallurgical process. Scanning electron micros…
We present a new route for the preparation of gamma-alumina and YAG nanoparticles. Metal salts of ethylhexanoic acids provide good solubility in hydrocarbon solvents and allow efficient ultrasonication. The sonication product is an alumioxane gel, which can reversibly collapse and reform, depending on the solvent used…
Wet chemical analyses of well-mixed fine drillings from a zirconium alloyed magnesium ingot showed that the resultant "soluble zirconium" was a function of the concentration of the hydrochloric or nitric acid that was used to digest the samples while the total zirconium could be readily and accurately determined. A so…
Several novel routes for the immobilization of modified Cu(salicylaldimine) complexes on commercially available silica are described. New pulse electron paramagnetic resonance (EPR) and electron-nuclear double resonance sequences, which provide more detailed information than that available previously, in combination w…
A protocol for setting up nanolitre sitting-drop vapour-diffusion experiments is reported. The procedure uses standard crystallization screening kits and 96-well crystallization plates. Reservoir solutions are transferred from 96-deep-well blocks to crystallization plates in a single step with a Robbins-Hydra pipettor…
0.9Pb(Zr 0.61 Ti 0.39 )–0.1Pb(Mn 1/3 Nb 2/3 )O 3 piezoelectric ceramics doped with Yb 2 O 3 were prepared by conventional ceramic processing, and the effects of the Yb doping on the sintering behavior and high power piezoelectric properties were investigated. X-ray diffractomer (XRD) measurements indicated that the pi…
A furnace covering the temperature range from 298 to 1300 K has been designed and constructed to study in situ the structural evolution of materials by using synchrotron X-ray microtomography. The furnace has cylindrical symmetry, compatible with the required 180° rotation, small dimensions and low absorption. It can…
The flow stress in tensile and compressive deformation has been determined in cast Mg, for a wide range of grain sizes between 36 mum and 1.5 mm. The grain size was varied by alloying Mg with small amounts of Zr. It was found that the 0.2% offset flow stress, sigma(y) (MPa), varies with the grain size, d (m), as sigma…
α-Allyl glucoside (AG) was incorporated into polyacrylonitrile by water-phase precipitation copolymerization (WPPCP) for the first time with K 2 S 2 O 8 −Na 2 SO 3 as initiator system to improve the resistance properties of protein adsorption and cell adhesion for acrylonitrile-based polymer. The effects of initiator…
Alkylborane type and boric ester type polymer electrolytes bearing mesitylboron units were prepared by hydroboration polymerization or dehydrocoupling polymerization using mesitylborane. The obtained well-defined organoboron polymer electrolytes showed ionic conductivities of 3.05 × 10 -5 −5.22 × 10 -6 S/cm at 50 °C i…
[reaction: see text] A new class of photochromic compounds based on the hexatriene backbone has been developed. The backbone, composed of a thiophene ring, a perfluorocyclopentene ring, and a trisubstituted olefin, undergoes reversible ring-opening and ring-closing photoisomerization reactions when irradiated with ult…
Experimental and theoretical directional magnetic Compton profiles (MCP's) of hcp-Co, fcc-Fe 50 Ni 50 and fcc-Ni are compared with each other to elucidate the difference of the electronic structures of magnetic electrons between fcc-Fe 50 Ni 50 (almost equivalent to fcc-Co) and hcp-Co, and between fcc-Fe 50 Ni 50 and…
Branched-chain amino acid aminotransferase (BCAT), which has pyridoxal 5'-phosphate as a cofactor, is a key enzyme in the biosynthetic pathway of hydrophobic amino acids (leucine, isoleucine, and valine). The enzyme reversibly catalyzes the transfer of the amino group of a hydrophobic amino acid to 2-oxoglutarate to f…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNewtonian Flow Behavior of Hyperbranched High-Molecular-Weight Polyethylenes Produced with a Pd−Diimine Catalyst and Its Dependence on Chain TopologyZhibin Ye and Shiping ZhuView Author Information Department of Chemical Engineering…
Comblike poly(ethyleneimine) (PEI) with −(CH 2 CH 2 )N(CH 2 CH 2 NH 2 )− as the repeating unit has been synthesized by employing a protecting group strategy, and analyzed by potentiometric titration. If the degree of protonation is plotted as a function of pH, the titration curve shows three protonation steps separate…
Mechanism of dinamic recrystallization (DRX) associated with twinning are proposed and discussed on the results of microstructure evolution during warm and hot deformation of a coarse-grained Mg