Materials Literature
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A broad classification scheme is proposed for half-metallic ferromagnets which embraces the possibilities of itinerant and localized electrons, as well as semimetallic and semiconducting electronic structure. Examples of each type are given. The problems of defining and measuring spin polarization are discussed and so…
A topological anomaly present at zero energy is shown to give rise to a peculiar and singular behavior of the dynamic and static conductivity in two-dimensional honeycomb lattices. A calculation in a self-consistent Born approximation reveals that this singular dependence prevails although being somewhat smoothed out…
Nanoparticles of LaF 3 doped with Ln 3+ (Ln = Eu, Er, Nd, and Ho) have been prepared that are dispersible in organic solvents. From the spectrum of Eu 3+ it has been concluded that the dopant ion occupies a La 3+ site. The luminescence decays are fitted biexponentially. A given possible explanation for this is a diffe…
LCSL
Transmission electron microscopy analysis of self-ordered porous alumina obtained by electrochemical anodization shows that self-ordering requires a porosity of 10%, independent of the specific anodization conditions. This corresponds to a volume expansion of alumina to aluminum of about 1.2. We propose that self-orde…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Neodymium doped phosphate glasses have been prepared by the semi-continuous melting technique. Their absorption and emission spectra have been recorded at room temperature. The Judd-Ofelt theory has been applied to evaluate the stimulated emission cross sections of 4 F 3/2 → 4 I 11/2 transition for Nd 3+ . The higher…
Abstract The melting behavior and crystallization kinetics of poly(2‐hydroxyethoxybenzoate) (PHEBA) were investigated with differential scanning calorimetry and hot‐stage optical microscopy. The observed multiple endotherms, commonly displayed by polyesters, were influenced by the crystallization temperature. By the a…
The temperature dependence of lattice constants a and c of intermetallic compounds R Mn 2 Ge 2 ( R = Sm, Gd) is measured in the temperature range 10-800K by using the x-ray diffraction method. The magnetoelastic anomalies of lattice constants are found at the different kinds of spontaneous magnetic transitions. The tr…
Extended X-ray absorption fine structure (EXAFS) spectroscopy and transmission electron microscopy (TEM) have been used to investigate Ni/Co bimetallic nanoparticles (bi-MNPs) in carbon species such as single-walled carbon nanotubes (SWNTs) produced via laser vaporization of a carbon−metal mixture. Results from select…
In this study, we systematically investigated 39 secondary amines as additives in concentrated EB/NMP solutions for gelation and degradation. We discovered that when both the width (defined as the longest distance between two hydrogens in the plane perpendicular to the NH bond of the amine) and depth (defined as the l…
A carboxylic acid-substituted picolinic hydrazone ligand (pcoap) forms a homoleptic [2 × 2] tetranuclear Cu(II)4 complex with four six-coordinate Cu(II) centers bridged by μ-O alkoxide groups in a square grid structure. The terminal carboxylic groups complete the six-coordinate structures at each copper centre, cappin…
We study transient drop deformation in dilute emulsions for large values of the capillary number Ca . We consider steady planar linear flows characterized by the dimensionless vorticity β. For drop-to-matrix viscosity ratios λ < 1, we find that the drops are strongly elongated by the extensional component of the flow…
Novel poly(ester−urethane) block copolymer has been synthesized by use of telechelic hydroxylated poly-[( R )-3-hydroxyoctanoate] (PHO-diol) with number-average molecular weight ( M n ) of 2400 as the amorphous soft segment, telechelic hydroxylated poly-[( R )-3-hydroxybutyrate] (PHB-diol) with M n of 2600 as the crys…
Abstract The influence of molecular architecture on morphology, mechanical properties, and micromechanical deformation behavior of asymmetric styrene/butadiene star block copolymers is investigated by transmission electron microscopy (TEM) and uniaxial tensile testing. In contrast to diblock copolymers, star block cop…
Both Fe(C) and Fe(O) nanoparticles have been successfully synthesized using a modified graphite arc-discharge method. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HREM), and electron diffraction (SAED) analyses indicated that both of these Fe nanoparticles have an average grain size of 15…
A novel complexed bridging ligand [Cu(bptap)2] which acts as a ferromagnetic coupler forms one dimensional chain consisting of tri-copper(II) [Cu2(Cu(bptap)2)]4+ units in which adjoining copper(II) ions are ferromagnetically coupled.
We have studied the experimental and theoretical aspects of the interaction of gold nanoshells on a waveguiding structure. Gold nanoshells are core−shell particles consisting of a silica core surrounded by a thin gold shell. The waveguiding structure consists of a 2 μ m thick layer of gold with a dielectric layer of v…
Abstract Electrochemical copolymerization of pyrrole and indole was performed galvanostatically in a solvent of acetonitrile (AN)/water (vol %: 99/1). The product obtained was characterized by cyclic voltammetry and infrared spectroscopy. The influence of the monomer feed ratio of pyrrole and indole on the synthesis o…
A new series of polymeric chainlike materials exhibiting the spin crossover phenomenon has been synthesized in aqueous conditions using different iron(II) salts and 4-(formylamino)-1,2,4-triazole (fatrz). The magnetic and thermogravimetric behaviors of the compounds of general formula [Fe(fatrz) 3 ](A) 2 · x H 2 O are…