Materials Literature
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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…
Applying the dynamical coherent potential approximation to a simple model, we have systematically studied the carrier states in $A_{1-x}$Mn$_xB$-type diluted magnetic semiconductors (DMS's). The model calculation was performed for three typical cases of DMS's: The cases with strong and moderate exchange interactions i…
Silver nanoprisms (∼74-nm edge length) were etched with HAuCl 4 to generate gold−silver alloy framework structures. Interestingly, these triangular nanoframes possess no strong surface plasmon bands in the ultraviolet or visible regions of the optical spectrum. By adding a mild reducing agent, l -ascorbic acid, gold a…
X-Cell is a novel indexing algorithm that makes explicit use of systematic absences to search for possible indexing solutions from cells with low numbers of calculated reflections to cells with high numbers of reflections. Space groups with the same pattern of systematic absences are grouped together in powder extinct…
Recently great advances have been made in demonstrating the viability of using carbon nanotubes (CNTs) to detect the presence of chemical gases such as NO 2, NH 3, and O 2, and they have led to the design of a new breed of sensor devices. Based on intrinsic CNTs, the devices are capable of detecting small concentratio…
Photoinduced electron accumulation in ZnO nanoparticles results in the bleaching of the exciton band as well as quenching of green emission. In the absence of an electron scavenger, photogenerated electrons are stored near the conduction band edge and promote charge recombination via a nonradiative process. By exposin…
A new biomimetic strategy for modification of biomaterial surfaces with poly(ethylene glycol) (PEG) was developed. The strategy exploits the adhesive characteristics of 3,4-dihydroxyphenylalanine (DOPA), an important component of mussel adhesive proteins, to anchor PEG onto surfaces, rendering the surfaces resistant t…
A reflection intensity integration method is presented based upon ab initio calculation of three-dimensional ( x , y , ω) reflection boundaries from a few physical crystal and instrument parameters. It is especially useful in challenging circumstances, such as the case of a crystal that is far from spherical, anisotro…