Materials Literature
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One-dimensional organization of copper nanoparticles has been achieved by chemical reduction using lipid-copper hybrid nanofibers as a template; the reduction of copper ions and the resulting formation of copper clusters occurred at intervals of 2–5 nm along the nanofibers.
Abstract For Abstract see ChemInform Abstract in Full Text.
First-principles calculations of \ensuremath{\beta}- and spinel-sialons $({\mathrm{Si}}_{6\ensuremath{-}z}{\mathrm{Al}}_{z}{\mathrm{O}}_{z}{\mathrm{N}}_{8\ensuremath{-}z})$ have been systematically made by a plane-wave pseudopotentials method, in order to find out atomic arrangements, bondings, and electronic structur…
Rotational (atropo-) isomers of Mn(III) meso-tetrakis(N-alkylpyridinium-2-yl)porphyrins and corresponding metal-free porphyrin ligands (where alkyl is methyl, ethyl, n-butyl, n-hexyl) and Zn(II) meso-tetrakis(N-methyl(ethyl,n-hexyl)pyridinium-2-yl)porphyrins were separated and isolated by reverse-phase HPLC. The ident…
Poly(ethylene terephthalate) (PET) ionomers containing terminal units derived from 3-sulfobenzoic acid, sodium salt (SSBA), were synthesized using metal-catalyzed melt polymerization techniques. SSBA (1.0−5.0 mol %) in the presence of sodium acetate (10 mol % compared to SSBA) served as an ideal chain-end functionaliz…
Abstract The melt rheological properties of linear low‐density polyethylene (LLDPE)/ethylene vinyl acetate (EVA) blends were investigated with special reference to the effect of blend ratio, temperature, shear rate, compatibilization, and dynamic vulcanization. The melt viscosity of the blends determined with a capill…
Abstract Graft copolymerization of acrylamide onto Cassia tora gum was studied in an aqueous medium using ceric ammonium nitrate‐nitric acid as the redox initiator. To optimize the reaction conditions for obtaining maximum percent grafting, the concentrations of Cassia tora gum, ceric ammonium nitrate, acrylamide, and…
Abstract D , L ‐lactide (LA) was first successfully ring‐opening polymerized in melt by Schiff base complexes K[ML] n H 2 O [M = Cu(II), Zn(II), Co(II), Ni(II); n = 2, 2, 3, 3.5; H 3 L = L ‐aspartic acid‐salicylidene Schiff base], which were prepared by Schiff base ligand derived from salicylidene and L ‐aspartic acid…
The objective of this study was to determine the effect of wood ash application on soil solution composition of three tropical acid soils. Calcium carbonate was used as a reference amendment. Amended soils and control were incubated for 60 days. To assess soluble nutrients, saturation extracts were analysed at 15 days…
The byssal threads of marine mussels represent a peculiar case of extraorganismic extracellular material. The threads consist of fibrous chimeric collagens such as preCol-P (with collagenous, elastin-like and histidine-rich domains) embedded in a microfibrillar matrix. We report here on the extraction, purification, a…
Phonon propagation in the disordered nanostructures at a high (about the Debye temperature or higher) temperature is considered. Scattering at the grain boundaries is assumed to be the main mechanism restricting the thermal conductivity. Influence of the structure (the grain size and its dispersion, the pore diameter…
We have studied in detail the structure and the nucleation and growth process of electrodeposited epitaxial hexagonal ZnO on GaN(0001). The crystallites grow with the c -axis perpendicular to substrate and the in-plane relationship is ZnO[100] || GaN[100]. We show that the deposit aspect progressively changes with the…
The aggregation of a copper(II) tetrasulfonated phthalocyanine (CuPcS 4 ) dye in aqueous sodium chloride solution has been studied using UV−vis spectroscopy and statistical mechanics. The concentration dependences of the molar absorption coefficients at 626 and 665 nm have been measured for CuPcS 4 solutions with conc…
Abstract For Abstract see ChemInform Abstract in Full Text.
Molecular dynamics simulation is used to reveal the origin of increased molecular mobility that accompanies plastic deformation of a glassy amorphous polymer under an applied stress. Significant increases in torsional transition rates are observed during active deformation prior to and just beyond the yield point. The…
Heterocyclic π-electron polymers such as polythiophene, polypyrrole, and polyfuran attract wide interest on both experimental and theoretical levels. While the optical properties of these materials are dominated by the band gap, no accurate, reliable computational method currently exists to predict the band gaps of la…
A phenomenological theory of magnetic and magnetoelectric (ME) susceptibilities of ferroelectric/ferromagnetic composites is presented and applied to the special case of layered structures. Expressions have been obtained relating the magnetic and ME susceptibility tensor components of the composite (symmetry point gro…
In this paper we develop a technique for determining interatomic potentials in materials in the quantum regime from single--shell Extended X-ray Absorption Spectroscopy (EXAFS) spectra. We introduce a pair distribution function, based on ordinary quantum time--independent perturbation theory. In the proposed scheme, t…
We present a numerical model study of the zero-temperature infrared optical properties of (III,Mn)V diluted magnetic semiconductors. Our calculations demonstrate the importance of treating disorder and interaction effects simultaneously in modelling these materials. We find that the conductivity has no clear Drude pea…
We have carried out an ultrahigh-field cyclotron resonance study of n-type ${\mathrm{In}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ films, with Mn composition x ranging from 0% to 12%, grown on GaAs by low-temperature molecular-beam epitaxy. We observe that the electron cyclotron resonance peak shifts to lower f…