Materials Literature
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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
There are still several problems associated with the spinning of dialyzed silk fibroin solutions. In this work some of these problems have been examined. The calcium nitrate tetrahydrate-methanol system was used to dissolve the silk fibroin. A compositional phase diagram was constructed at various concentrations of th…
An initial tranche of results from day-to-day use of a robotic system for setting up 100 nl-scale vapour-diffusion sitting-drop protein crystallizations has been surveyed. The database of over 50 unrelated samples represents a snapshot of projects currently at the stage of crystallization trials in Oxford research gro…
Single-walled carbon nanotubes (SWNTs) are insoluble in either water or oil. When mixtures of SWNTs, water, and toluene are sheared vigorously, a macroscopic emulsion of water droplets forms in toluene, with the SWNTs residing at the interface between the immiscible fluids, acting as a natural “surfactant” or interpha…
We demonstrate that an organic Mott insulator, β'-(BEDT-TTF) 2 ICl 2 , is metallized by application of extremely high pressure by means of the cubic anvil press. When the metallic state is stabilized, superconductivity with the highest transition-temperature ( T c ) among the organic systems appears. The lower limit o…
Comprehensive investigation of lithium ion complexation with 15 N-labeled polyphosphazenes 15 N -poly[bis(2-(2-methoxyethoxy)ethoxy)phosphazene] ( 15 N -MEEP) and 15 N -poly-[((2-allylphenoxy) 0.12 (4-methoxyphenoxy) 1.02 (2-(2-methoxyethoxy)ethoxy) 0.86 )phosphazene] ( 15 N -HPP) was performed by NMR, IR, and Raman s…
Using X-ray scattering over a large range of scattering vectors, it is shown how to measure both the pore volume fraction and pore specific surface of an assembly of porous grains forming a powder. Depending on the presence or not of solvent in the inner pores and in the intergranular media, the scattered signal per u…