Materials Literature
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The fire retardant action of red phosphorus in nylon 6 was im proved by co-addition of ferric/ferrous oxides. It was found that the activity of Fe oxides depends on the product grade. Polymer formulations, non-ignitable in air were obtained by co-addition of Fe 3 O 4 /Fe 2 O 3 = 3:2 with red phosphorus. Scanning elect…
Within the wealth of hydrocarbon polymers, poly(p-phenylene alkylene)s (“alkarotics”) hold a special position since they have been a long forgotten class of hydrophobic polymers. This is somewhat surprising, since the cornerstones of this polymer family cover extremely broad materials properties and the few known repr…
Crystal structures of the compounds Ca 9 R (VO 4 ) 7 ( R = Tb ( I ), Dy ( II ), Ho ( III ), and Y ( IV ) have been studied by the method of the full-profile analysis. All the compounds are crystallized in the trigonal system (sp. gr. R 3 c , Z = 6) with the unit-cell parameters ( I ) a = 10.8592(1), c = 38.035(1), V =…
Measurements of the chirality (2 pi/pitch) in the chiral nematic phase and of a structural constant proportional to the chirality in the isotropic liquid for a system in which a helix inversion line crosses the chiral nematic to isotropic phase transition line are reported. While the chirality shows a strong temperatu…
Summary Many horizontal wells produce both oil and brine for an extended period of time and, therefore, in many cases the problem of mineral scale deposition must be solved. Scale management in long horizontal wells faces several challenges, a major one being the correct placement of the scale inhibitor slug in the fo…
The hydration state of a series of [Ln(DO2A)(H2O)n]+ complexes in aqueous solution at pH = 6.4–7.0 was studied by measuring the lanthanide-induced 17O shifts (LIS) of water [Ln includes elements from Ce to Yb; DO2A = 1,7-bis(carboxymethyl)-1,4,7,10-tetraazacyclododecane]. Their contact contribution, obtained from Reil…
New homo- and heterometallic hexanuclear complexes of formula {[Cu(tmen)(H2O)]2[Cu(tmen)]2[Cu2L](H2O)}(ClO4)4 · 2 H2O [Cu6-tmen] {[Cu(pmdien)]4[Cu2L]}(ClO4)4 · 4 H2O [Cu6-pmdien] and {[Ni(cyclam)]4[Cu2L]}(ClO4)4 · 4 H2O [Cu2Ni4-cyclam] [H8L = tetrakis(aminomethylene)methanetetrakis(oxamic acid), tmen = N,N,N′,N′-tetra…
In this study, the microstructural development of AlN during combustion synthesis (CS) in a nitrogen atmosphere was investigated. CS using an aluminum–50 wt% AlN–3 wt% MgCl 2 powder compact yielded a mixture of AlN whiskers and powder. The microstructural development during the combustion reaction was studied by heati…
Metal cluster complexes with interesting magnetic properties characteristic of nanoscale magnetic particles have become an attractive prospect in the last few years. These complexes exhibit magnetization hysteresis loops and out-of-phase ac magnetic susceptibility signals. The advantages of such clusters over fragment…
Water proton transverse relaxation times (T2) and self-diffusion coefficients (D) were measured in randomly oriented hydrated collagen fibers. Three T2 relaxation times were discerned indicating the presence of at least three water fractions in the collagen sample. The D values associated with each water fraction were…
We have prepared Ba–Co2Z and Sr–Zn2Y ferrites by mixing SrCO3 (BaCO3), Co2O3 (ZnO), and Fe2O3 and calcinating in air and O2. The effects of sintering atmosphere (O2 and Ar) and sintering temperatures (1373–1573 K) on the structural, magnetic, and electrical properties have been measured. The Ba–Co2Z sample sintered at…
A first-principles molecular-dynamics study of glassy ${\mathrm{As}}_{2}{\mathrm{Se}}_{3},$ using a 215-atom model, is presented. Our model is in good and uniform agreement with available measurements of the structural, vibrational, and electronic properties. The model reproduces the structure of the experimental stat…
Computer simulations are performed in this article to show the feasibility of simultaneous determination of the film diffusivity, the substrate diffusivity, and the thermal boundary resistance of film-on-substrate systems by modulated thermoreflectance microscopy and multiparameter fitting. The dependences of the phas…
An icosahedral phase (i-phase) has been synthesized by mechanical alloying of an elemental blend of Al70Cu20Fe10. Mechanical alloying of Al and Fe in the stoichiometric ratio of 3:1 and continued milling after the addition of Al and Cu to yield the nominal composition of Al70Cu20Fe10 does not result in the i-phase for…
Plasma-assisted molecular beam epitaxy of ZnO epilayers and MgZnO/ZnO heterostructures on Al2O3(0001) substrates is described. A thin MgO layer is employed as a buffer for ZnO. The influence of the buffer on the initial growth of ZnO is discussed with the corresponding reflection high-energy electron diffraction (RHEE…
The through focus exit wave reconstruction technique uses a series of high resolution electron microscopy images to reconstruct the complex electron wavefunction at the exit plane of the specimen. The feasibility of the through focus exit wave reconstruction method and its most important limitations are discussed. It…
The magnetic anisotropy of epitaxial Cu(50 Å)/Ni(tNi/Cu(2000 Å)/Si(001) films as a function of the nickel film thickness (30 Å⩽tNi⩽150 Å) has been studied using a torque magnetometer. It is found that the magnetization rotates continuously from out-of-plane to in-plane as the nickel film thickness increases. For the 1…
In vivo (13)C nuclear magnetic resonance spectroscopy was used to elucidate the pathways and the regulation of pyruvate metabolism and pyruvate-lactate cometabolism noninvasively in living-cell suspensions of Propionibacterium freudenreichii subsp. shermanii. The most important result of this work concerns the modific…
The infrared reflectance spectra of two ${\mathrm{LaMnO}}_{3}$ crystals (pure and doped) have been measured at various temperatures between 300 and 10 K. The infrared active phonons of the two samples have been studied in detail and have been compared to recent lattice dynamics calculations. In the case of the undoped…
The temperature and field dependence of the magnetization have been measured to investigate the magnetic properties of the first oxalate–bpy mixed-ligand framework with a general formula M(ox)(bpy) (M = Fe(II), Co(II), Ni(II); ox = C2O42−; bpy = 4,4′-bipyridine). All compounds in the M(ox)(bpy) system crystallize in a…