Materials Literature
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Large magnetic entropy changes were observed in RCoAl compounds, where R = Gd, Tb, Dy, and Ho, at their Curie temperatures. These RCoAl alloys have a hexagonal, MgZn 2 structure and their Curie temperatures fall in the temperature range 10-100 K. A `table-like' behaviour was found in the temperature dependence of the…
Two-dimensional, hexagonally ordered silicas with large uniform mesopores (7.6−11.9 nm) have been assembled through a nonionic supramolecular assembly pathway using sodium silicate as a silica source and the triblock copolymer Pluronic P123 (EO 20 PO 70 EO 20 ) as a structure-directing agent. An increase in the synthe…
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Regular 2D rectangular lattices of permalloy nanoparticles (40 nm in diameter) were prepared by the method of the electron lithography. The magnetization curves were studied by Hall magnetometry with the compensation technique for different external field orientations at 4.2K and 77K. The shape of hysteresis curves in…
The large strain deformation response of 6061-T6 and Ti-6Al-4V has been evaluated over a range in strain rates from 10{sup -4} s{sup -1} to over 10{sup 4} s{sup -1}. The results have been used to critically evaluate the strength and damage components of the Johnson-Cook (JC) material model. A new model that addresses…
We report the structural and electron transport properties of 3R-Nb 1+ x S 2 ( x ⩾0.07) and 3R-Ga x NbS 2 (0.1⩽ x ⩽0.33) prepared as polycrystalline pellets as well as single crystals grown by vapour transport. We observe a resistance minimum in these compounds between 20 and 60 K, with T min proportional to x . The r…
On the basis of a first-principles electronic structure theory of finite temperature metallic magnetism in layered materials, we investigate the onset of magnetic order in thin (2-8 layers) fcc-Fe films on Cu(100) substrates. The nature of this ordering is altered when the systems are capped with copper. Indeed we fin…
In this work the interaction of electromagnetic field with quasi-periodic media has been scrutinized. We have obtained the formula for a distorted medium polarizability tenzor in the X-ray frequency band. Also there have been obtained the X-rays dynamic diffraction equations for media with arbitrary smooth distortion.…
When water is heated and pressurized above the critical point, it becomes a suitable solvent to employ organic capping ligands to control and stabilize the synthesis of nanocrystals. Without alkanethiol ligands, Cu(NO(3))(2) hydrolyzes to form polydisperse copper(II) oxide particles with diameters from 10 to 35 nm. Ho…
It is shown that the flow of a simple Newtonian liquid near a hard wall can be affected by the chemical nature of this wall. We have studied with a surface force apparatus (SFA) the hydrodynamic force between a sphere and a plane immersed in glycerol. The drainage of the thin film is different on a hydrophobic plane a…
Abstract The purpose of this study was to investigate the effects of reaction media, composition, and temperature on the rate of the alkaline depolymerization of poly(trimethylene terephthalate) (PTT). The alkaline depolymerization of PTT was carried out at 160–190°C in ethylene glycol (EG), diethylene glycol (DEG), t…
Oxidation of preadsorbed propyne has been characterized on the Pt(111) surface in oxygen at pressures up to 0.009 Torr using fluorescence yield ultrasoft X-ray adsorption methods above the carbon K edge. A combination of temperature-programmed reaction spectroscopy (TPRS) and temperature-programmed fluorescence yield…
Abstract Tensile properties of Attacus atlas ( Saturniidae ) silk were measured in air, water, and ethanol. Control samples in air showed a large variability, so a normalization method was developed to enable comparison with the behavior of samples submerged in the liquid media. Amino acid analysis demonstrated that t…
Abstract We report the transcrystallinity of poly(vinylidene fluoride) on several different types of substrate materials. The supermolecular structure and its development were characterized with polarization microscopy, whereas differential scanning calorimetry was used for monitoring the isothermal and nonisothermal…
Abstract The large deformation failure behavior of gelatin–maltodextrin composite gels was assessed. All the studied compositions were selected to lie within the incompatibility domain of the gelatin–maltodextrin phase diagram at 60°C, which produced gelatin continuous (maltodextrin included) and maltodextrin continuo…
A numerically exact solution of the time-dependent Schr\"odinger equation for noninteracting large-spin $(S=10)$ molecules in the presence of crystal-field anisotropy and time-dependent longitudinal magnetic field is performed. Crystal-field parameters and a field sweeping rate to fit experiment on ${\mathrm{Fe}}_{8}$…
Limited monomer solubility imposes very intriguing features on poly(p-phenylenebenzobisoxazole) polymerization. Only one type of functional group is detected at oligomer chain ends, and a high-molecular-weight polymer is obtained even when an excess of the monomer with low solubility is used. These remarkable phenomen…
We report an x-ray-scattering study of octahedral tilt ordering in the manganite series ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ with $x=0.4$ and 0.25 and in ${\mathrm{LaMnO}}_{3}.$ The sensitivity to tilt ordering is achieved by tuning the incident x-ray energy to the ${L}_{I},$ ${L}_{\ma…
We report image analysis of popping bubbles during the collapsing of two-dimensional (2D) and 3D aqueous foams. Although temporal and spatial correlations between successive popping bubbles within avalanches are emphasized, the breaking of a soap film at the air/foam interface seems to be independent of (i) the topolo…
Abstract The instability in water of poly(vinyl alcohol) (PVA)/poly(carboxymethyl cellulose) (CMC) was improved through radiation‐induced grafting with a styrene monomer. The PVA/CMC blend graft copolymer was used as a sorbent for dye wastes normally released from textile factories. The factors that may affect the sor…