Materials Literature
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Ab initio molecular dynamics simulations are performed on small single wall nanotubes. By structural relaxation, the equilibrium C-C bond lengths and bond angles are determined. Our result shows that for both zigzag and armchair nanotubes there are two nonequivalent bond lengths. One bond stretches from that of the gr…
Single crystals of K 2 Te 4 O 9 ·3.2H 2 O, KGaTe 6 O 14, and KGaTe 2 O 6 ·1.8H 2 O have been synthesized by supercritical hydrothermal methods using KOH, TeO 2, and Ga 2 O 3 as reagents. K 2 Te 4 O 9 ·3.2H 2 O has a layered structure, whereas KGaTe 6 O 14 and KGaTe 2 O 6 ·1.8H 2 O have three-dimensional frameworks. In…
Abstract With trimesinic acid as a molecular weight regulator, the hydrolytic polymerization of ϵ‐caprolactam was carried out, and nylon‐6 or polyamide‐6 with three‐branched chains was obtained. Through a systematic study of the effects of conditions such as the reaction time and concentration of trimesinic acid on th…
The classical approach for solving magnetic structures is the “trial and error” (TE) method. The reason is that many studies have been performed on relatively simple systems and the fact that the dominant isotropic exchange interactions, in absence of frustration, favour simple collinear structures. The improvement of…
Analytical profiles are used in most programs for Whole Powder Pattern Fitting (WPPF) and Reitveld method used in microstructural as well as in structural studies. The present work deals with the effect of microstructure and lattice defects on the shape, width and position of diffraction profiles, and their role in WP…
Recent interest has been generated in composite materials for which both the dielectric constant and the magnetic permeability are negative. These composites behave as if they possess a negative index of refraction, although the broader, less specific adjective "left-handed" has also been applied to them. Such composi…
A renormalization method is developed for the Kubo-Greenwood formula, in order to analyze the electronic transport in large quasiperiodic lattices at zero temperature, within a tight-binding model. The results show a scaling invariance of the conduction spectrum around the transparent state, where a periodic oscillati…
Abstract We investigated the effect of reactive blending on the mechanical properties and morphology of high‐density polyethylene (HDPE)/plasticized starch blends. HDPE was chemically modified to enhance the compatibility with the plasticized starch. The modified HDPE, HDPE‐ g ‐glycidyl methacrylate (GMA), was synthes…
We have investigated thermal hysteresis of magnetization and resistivity in $\mathrm{La}{}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0.5\ensuremath{\le}x\ensuremath{\le}0.6)$ with an $A$-type antiferromagnetic structure. For $0.52\ensuremath{\le}x\ensuremath{\le}0.56$, the magnetization curve exhibits a…
To synthesize functionalized poly(lactic acid-co-glycolic acid)-based polyesters for biomedical and pharmaceutical applications such as controlled drug delivery, D-gluconic acid was considered as an interesting source of comonomer. Accordingly D-gluconic acid was used to synthesize novel 1,4-dioxane-2,5-diones with pr…
Abstract Cellulose regenerated by the viscose process was previously investigated as an implantable material in orthopedic surgery. It was envisaged to take advantage not only of its good matching with mechanical properties of bone but also of its hydroexpansivity, therefore allowing a satisfactory fixation to hard ti…
Abstract Virgin ethylene propylene diene monomer (EPDM) rubber in a thermoplastic elastomeric blend of polypropylene (PP) and EPDM rubber was substituted by ground EPDM vulcanizate of known composition, after which the mechanical properties of the raw EPDM/waste EPDM/PP blends were determined. The ratio of the rubber…
The structure of the Ru(II) ion pairs trans-[Ru(COMe)[(pz(2))CH(2)](CO)(PMe(3))(2)]X (X(-) = BPh(4)(-), 1a; BPh(3)Me(-), 1b; BPh(3)(n-Bu)(-), 1c; BPh(3)(n-Hex)(-), 1d; B(3, 5-(CF(3))(2)(C(6)H(3)))(4)(-), 1e; PF(6)(-), 1f; and BF(4)(-), 1g; pz = pyrazol-1-yl-ring) was investigated in solution from both a qualitative (c…
The surfactant properties of solutes play an important role in the sonochemistry and sonoluminescence of aqueous solutions. Recently, it has been shown, for relatively low molecular weight surfactants, that these effects can be correlated with the Gibbs surface excess of the solute. In the present study we investigate…
Abstract Copolymer latices of styrene–butyl acrylate–silicone were prepared using a semicontinuous addition process and batch and monomer emulsion addition processes. The results showed that a stable latex with narrow particle size dispersion and a high monomer conversion can be obtained only by the semicontinuous add…
Abstract Processing, cure characteristics, and mechanical properties of EPDM rubber containing ground EPDM vulcanizate of known composition were studied. Mooney viscosity increases and Mooney scorch time decreases by the addition of the ground vulcanizate. At higher loadings of the ground rubber, the maximum rheometri…
The synthesis and structural characterization of several new cyano-bridged copper(II) and nickel(II) homodinuclear complexes is presented. The measure of magnetic properties for these complexes is complemented with a computational study of the exchange coupling for several model structures representing this family of…
Abstract CoFe 2 O 4 magnetic nanoparticles were prepared by in situ precipitation and oxidation of Co 2+ and Fe 2+ within a sulfonated polystyrene resin. The nanometric particles were characterized by X‐ray diffraction. A ferrofluid was prepared from the CoFe 2 O 4 mineralized polymer resin and water. Poly(vinyl alcoh…
[reaction: see text]. The chlorosulfonation of tris(pentafluorophenyl)corrole proceeds with an extremely high selectivity as to afford one out of 139 possible isomers in very high yield. The bis-chlorosulfonated corrole is an excellent precursor to the planar-chirality (triphenylphosphine)cobalt(III) complex (fully ch…
Copper–cobalt–aluminium hydrotalcites with (Cu + Co)/Al atomic ratio of 3.0 and Cu/Co atomic ratios 80:20, 75:25, 50:50, 33:67, 25:75 and 20:80 were synthesized by coprecipitation under low supersaturation and characterized by various physicochemical techniques. Powder X-ray diffraction (PXRD) showed a single phase wi…