Materials Literature
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The adsorption and electronic structure of benzene (C 6 H 6 ) on thin film MgO(100)/Mo(100) and highly ordered Al 2 O 3 /Mo(110) substrates have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). Three desorption states have been found for both su…
The translational diffusion coefficient D was determined from dynamic light scattering measurements for oligo- and polyisobutylenes in isoamyl isovalerate (IAIV) at 25.0 °C (ϑ) and in n -heptane at 25.0 °C in the range of weight-average molecular weight M w from 1.01 × 10 3 to 1.76 × 10 6 . The values of the unperturb…
Gel-like aqueous solutions of sodium lithocholate (NaLC) have been studied by neutron and X-ray small-angle scattering techniques. Evidence for the existence of fibrillar aggregates is presented. In a 0.48% NaLC sample, the diameter of the rod-like structures is ca. 650 Å. The scattering patterns, which can be anisotr…
The crystal structure at room temperature of the solvated iron−sulfur synthetic compound (Et 4 N) 3 [Fe 4 S 4 (SCH 2 Ph) 4 ]·DMF has been determined. The conformation of four ligand branches CH 2 Ph linked to the Fe 4 S 8 unit is very disturbed in contrast with the much more symmetrical situation in the already known…
The effect of hot band annealing temperature, range from 700-1000°C, on the magnetic properties of low-carbon electrical steels measured at 10, 15 and 17 kG inductions have been investigated. The grain microstructures of hot bands were changed by annealing at various temperature. Small grains are observed in the as ho…
The growth mechanism of CdS ultrafine particles in water-in-oil microemulsions was investigated. The growth occurs via a irreversible particle coagulation process. Its rate constant is dependent on the agglomeration number of a particle n. At small agglomeration numbers, the rate constant k is about 107 dm3mol–1s–1. I…
The effects of Brønsted acidity on the spatial structure and electronic properties of platinum clusters supported on zeolite Y have been examined with X-ray absorption (XANES and EXAFS) and X-ray photoelectron spectroscopy. The clusters contain 10−25 Pt atoms on average, with a nearest-neighbor distance of 2.70 ± 0.01…
Abstract Thin films of chloroauric acid salt of chitosan (CTOAu films) were photolyzed with 253.7 nm light. On irradiating with UV light in air at room temperature, the CTOAu film first became yellow‐blue colored due to the formation of colloidal gold. When irradiation was continued, the irradiated surface of the film…
The failed interfaces between natural rubber skim compounds and tire steel cord used as tire cord adhesion test (TCAT) specimens have been studied by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis in order to understand the influence of cobalt boroacylate in the rubber compound as an adh…
The study confirms the effect of lowering manganese (Mn) content of sour service line pipe steels on improving the resistance to hydrogen induced blister cracking (HIBC), following which thermo-mechanical control process (TMCP) is considered as an effective tool to strengthen and toughen the low manganese steels. The…
The structure and morphology of nylon 55 has been investigated using transmission electron microscopy, selected area electron diffraction, and X-ray diffraction. Different morphologies, varying from rhombus to lath-shaped lamellar crystals, were obtained from formic acid−butanol solutions. The unit cell is monoclinic…
An activated carbon prepared by CO2 activation from a demineralized Spanish lignite char was oxidized by treatment with H2O2. This oxidized activated carbon was heat treated in an He flow at different temperatures up to 1273 K, and the samples so obtained were exposed to ambient air for two years. The oxygen surface c…
The conformational energy of chain fragments of poly(methylphenylsiloxane) is studied, considering contributions from bond stretching, bond angle bending, bond torsion, and van der Waals interactions. Energy is minimized without constraints, so that minima correspond to fully relaxed conformations. The energy minima o…
The effect of pressure on diffusivity in binary or multicomponent systems such as gas−liquid or gas−solid systems has rarely been reported. The diffusivity of carbon dioxide in extruded gelatinized starch has been measured in this study at pressures of up to 117 bar (1700 psi). Such data are fundamentally not only use…
We calculate higher order effects such as frequency shifts and radiation loss in grating waveguides and grating couplers. The approach follows a vector variational principle which incorporates the Floquet components correct to first order. It is unnecessary to bring radiation modes into the formalism. This yields a si…
The singly excited configuration interaction (CIS) approximation and the CNDO model Hamiltonian have been employed to calculate the optical spectra of [Cd(SPh) 4 ] 2-, [Cd 2 (SPh) 6 ] 2-, and [Cd 4 (SPh) 10 ] 2- and the artificial defect models [Cd 2 (SPh) 5 ] - and [Cd 4 (SPh) 9 ] - (Ph = phenyl). The electronic tran…
The corrosion behavior of Zircaloy-type alloys with different tin contents of 1.55, 0.70, and 0.55 wt% was studied at 350°C and 17 MPa in an environment similar to PWR primary water. For this non-interrupted test, a special autoclave system was used that was equipped with electrical feed that allowed followup on the g…
Residual stresses in Al2O3 and Si3N4-matrix nanocomposites (added with β-SiC or WC phase) have been measured by piezo-spectroscopy. The highest residual stress value was found in Al2O3-matrix materials. Machining procedures have been found to play a minor role in the formation of residual stresses. Analyses of both sp…
Variation of the reaction mechanism for homogeneous thermal decomposition of NO into N2 and O2 in the temperature range between 1000 and 4000 K is studied. The decomposition always proceeds through an atomic chain mechanism initiated by formation of oxygen atom. However the step of the oxygen atom initiation depends o…
The temperature dependence of the fracture toughness of ceramics exhibiting duplex microstructures was studied relative to their single‐phase constituents using two test methods: bend testing of chevron‐notched beams, and the indentation‐crack‐length technique. The two materials systems studied were Al 2 O 3 : c ‐ZrO…