Materials Literature
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We have prepared (Sm-Co)/Co multilayers with two different Co thicknes to study the hard magnetic properties (coercivity H ci and energy product BH max ) of nanostructured SmCo magnets consisting of hard SmCo and softer higher moment Co phases. Samples are annealed at a temperature in the range 450 – 700°C, for 20 min…
Volume is indexed by Thomson Reuters CPCI-S (WoS).X-ray powder diffraction is a non-destructive technique widely applied for the characterisation of crystalline materials. The method has been traditionally used for phase identification, quantitative analysis and the determination of structure imperfections. In recent…
Thermopiles are uncooled, broadband detectors that require no chopper or temperature stabilizer. Their wide operating- temperature range, lack of temperature stabilization, and radiometric accuracy make thermopiles well suited for some space-based scientific imaging applications. These detectors may also offer advanta…
Abstract Mathematical models are proposed to predict degradation of unstabilized low density polyethylene (LDPE) films and those stabilized with hindered amine light stabilizers (HALS) under both thermo‐oxidation at 90°C and natural weathering conditions. The degradation was measured by change in percent elongation at…
Abstract The reactivity of cyclosiloxane with 3,3,4,4,5,5,6,6,6‐nonafluorohexyl group and its application to fluorosilicone synthesis were studied. In contrast to the polymerization of the commercially available 1,3,5‐tris(3,3,3‐trifluoropropyl)‐1,3,5‐trimethylcyclotrisiloxane (CF 3 –D3), the polymerization of 1,3,5‐t…
Abstract A disperse dyeable polypropylene fiber has been prepared by admixing polystyrene to the polymer prior to extrusion. Polystyrene has been synthesized at suitable molecule weight and narrow mol wt distribution. The dyeability, mechanical properties, shrinkage, degree of crystallinity, and orientation of pure po…
The transverse Hall resistivity, ${\ensuremath{\rho}}_{\mathrm{xy}},$ and magnetization, M, of [110] and [100] oriented epitaxial ${\mathrm{Nd}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ films with large magnetoresistance were measured as a function of temperature and applied magnetic field to study the ordinary and…
A novel strategy for preparing a wide range of substituted poly(aniline)s from a single precursor is described. This approach relies on a boron activation/electrophilic displacement reaction resulting in ipso-substitution. Specifically, we demonstrate this strategy to prepare a few of the many possible structures that…
Starting with β-formyl- and β,β′-diformylporphyrins, novel mono- and dipyrroloporphyrins were synthesised via 1,5-electrocyclization of porphyrinic azomethine ylides.
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…