Materials Literature
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This paper describes the implementation of real-space torsion-angle refinement as a tool for model (re)building. The algorithmic details and parameterization for a number of different protocols are presented, as well as the handling of special conditions. Examples illustrating the use of the algorithms show that these…
The preparation and characterizations of new hybrid organic–inorganic nanocomposites consisting of acrylonitrile–butadiene–styrene terpolymer and a Na+-exchanged montmorillonite (MMT) are described by direct intercalation through one-step emulsion polymerization. Those products were purified by successive hot acetone…
A new magnesium alloy strengthened by icosahedral quasicrystalline particles and precipitates was developed by thermomechanical processes for an as-cast Mg-rich Mg95Zn4.3Y0.7 alloy. Quasicrystalline particles of 0.5–2 \\micron in size were distributed in the α-Mg matrix by the hot-rolling process, and nanoscale quasic…
We applied dynamic light scattering technique on the model system of hen egg lysozyme in salt-free aqueous ethanol solution to study the mechanism of denaturation and aggregation of protein. At low ethanol concentration [0-63% (v/v)], the fast relaxation mode was observed, which was caused by lysozyme molecules in the…
This work describes a new strategy for the preparation of hyperbranched polymers from commercially available A2 and BB′2 type monomers without any catalysts; the rapid reaction of A groups with B groups results in the formation of dimers that can be regarded as a new sort of AB′2 type monomer; further polymerization o…
The absorption and scattering of light by silver and gold nanoparticles and their aggregates provides a powerful mechanism for detecting important molecules in a variety of applications. The authors describe recent advances in determining nanoparticle optical properties using computational electromagnetics.
Cereals & Grains Association is a nonprofit organization dedicated to advancing the knowledge and understanding of cereal grain science through research leadership, education, superior technical service, and advocacy.
Efficient syntheses are reported for tetraiodotetrathiafulvalene 2, 4-iodo-5-methyl-4′,5′-bis(methylsulfanyl)TTF 3, and 4-iodo-4′,5′-bis(methylsulfanyl)TTF 4 by iodination, using perfluorohexyl iodide, of lithiated derivatives of the corresponding TTF system. Bromination and chlorination of lithiotrimethylTTF using 1,…
This paper presents a generalized 2-D tensor finite element model, which can be used to evaluate force components in electromagnetic devices including those due to the magnetostrictive phenomenon. Magnetostriction is a property of ferrous alloys in which the material will exhibit strain in the presence of magnetic fie…
Corrosion products formed on copper plates exposed in urban, rural/coastal, and hot spring areas in Japan were characterized by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and coulometric reduction. The exposure tests were carried out for a month in summer. XRD patterns showed that hydrated copper sulfa…
Poly[(3,4-ethylenedioxy)pyrrole-2,5-diyl] (PEDOP) and poly[(3,4-propylenedioxy)pyrrole-2,5-diyl] (PProDOP) were synthesized by in situ chemical polymerization yielding highly transmissive, conductive and electroactive thin films. PProDOP coatings exhibit a surface resistivity of 16 kΩ □−1 at 60% and 58 kΩ □−1 at 99.9%…
The light induced excited spin state trapping LIESST and the reverse LIESST-like phenomena are observed below and above the spin transition temperature, respectively, for new dinuclear diiron(II) complexes and familiar Fe(II) complexes with thiocyanate ligands by monitoring the Raman spectra where only excitation ligh…
The potential cytotoxicity on vascular smooth muscle cells of corrosion products from 316 L stainless steel, one of most popular biomaterials of intravascular stents, has not been highlighted. In this investigation, 316 L stainless steel wires were corroded in Dulbecco's modified eagle's medium with applied constant e…
The catalytic hydroxylation of alkanes by an electron-deficient cobalt(III) porphyrin complex and m-chloroperbenzoic acid yielded alcohols as major products with a high kH/kD value, >99% retention of stereochemistry, and a high regioselectivity; a high-valent cobalt–oxo porphyrin complex was suggested as a reactive hy…
A series of six dye-functionalized Nd3+ complexes have been synthesized and their photophysical properties have been studied and evaluated. The incorporated dyes dansyl, coumarine, lissamine, and Texas Red possess broad and intense absorption bands in the visible spectral region and therefore are ideally suitable as p…
Copolymers containing Ru(bpy)3 and coumarin-2 chromophores prepared using both grafting and copolymerization approaches exhibit Förster-type energy-transfer efficiencies ranging from 70% to above 98%.
The optical absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine (EHO) is highly sensitive to low concentrations of NO2 in nitrogen. LB films prepared at much faster than conventional deposition rates (∼1000 mm min−1) yield t50 response and recovery times of…
Polystyrene microspheres coated with cationic surfactants are easily prepared by microemulsion polymerization. These microspheres can be used in place of surfactants to synthesize porous silica foams. The nature of the foams depends strongly upon the synthesis conditions. Under basic catalysis, “closed-cell” foams are…
Two series of hexakis(alkyloxy)triphenylenes have been synthesised and characterised. All materials contain two different lengths of n-alkyloxy chains. Series I (C5Cn) materials contain three –OC5H11 chains and three –OCnH2n + 1 chains. Series II (CmCn) materials contain three –OCmH2m + 1 chains and three –OCnH2n + 1…
The evolution of globular and dendritic structures in solidification of an Al–7mass%Si alloy has been investigated by a modified cellular automaton model (MCA). Besides retaining the probabilistic aspects of the classical CA model for the heterogeneous nucleation and the preferential growth orientations of the nuclei,…