Materials Literature
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Ordered mesoporous carbons have recently been synthesized using ordered mesoporous silica templates. The synthesis procedure involves infiltration of the pores of the template with appropriate carbon precursor, its carbonization, and subsequent template removal. The template needs to exhibit three-dimensional pore str…
To understand and control hydrogen induced cracking and stress corrosion cracking, the processes of hydrogen absorption, diffusion and trapping are of interest. Fundamentals of these processes are described and of the determination of permeation coefficient, diffusivity and solubility of H in iron and steels, using th…
There are apparently conflicting observations about the influence of seawater temperature on the immersion corrosion of copper-nickel alloys, with both increases and decreases in temperature having been observed. During the 1980s, ASTM sponsored a worldwide corrosion study, which included 90:10 copper-nickel (UNS C070…
In support of the Federal Aviation Administration's Catastrophic Failure Prevention Program, SRI International has identified advanced materials and is developing shielding concepts to protect critical aircraft components from uncontained engine debris. Full-scale fragment impact tests on a commercial aircraft fuselag…
Results of the dielectric studies of nine members of the nBT (4-n-alkyl-4'-thiocyanatobiphenyl, n= 2-10) homologous series in the crystal E (E) and isotropic (I) phases are presented. The dependence of the static permittivity ∊s in the isotropic phase, the longitudinal relaxation times τis and τ∥, and the activation e…
We report on the wavelength-multiplexing diffractive phase element (WMDPE) capable of generating independent spot patterns for different wavelengths. The iterative method proposed by Bengtsson [Appl. Opt. 37, 1998] for designing a kinoform that produces different patterns for two wavelengths is extended to the WMDPE f…
Pulsed plasma polymerization of 2-cyanoethyl acrylate leads to the deposition of structurally well-defined cyano-functionalized thin films. These layers are found to readily complex silver ions from solution and also exhibit pressure-sensitive adhesive behavior.
In this work, we report unusual properties of amorphous carbon films prepared by ion beam-assisted deposition using different noble gases (neon, argon, and krypton). Independent of the noble gas ions used, the intrinsic compressive stress and plasmon energy increase sharply with the assisting ion beam energies up to 1…
A lumped circuit model is derived for a winding in a multiwinding transformer. The model is intended to be used in transformer models for circuit simulation using electrical-network simulators. A hybrid (partly electrical, partly magnetic) modeling approach is adopted in which magnetic components are described using t…
The aim of the work was to demonstrate an alternative to conventional end-of-life (EOL) disassembly strategies such as robotic or hand dismantling. This initial investigation reports the disassembly of consumer electronic products using smart materials in the design of embedded releasable fasteners. A series of produc…
Abstract X‐ray photoelectron spectroscopy is widely used for the quantitative surface analysis of polymer blends. The compositions of some polymers can change under x‐ray exposure, influencing peak intensities and positions in survey spectra and, in addition, the peak shapes in high‐energy resolution spectra. In order…
Megaspherulites occur in a rhyolitic vitrophyre, near the base of a thick rhyolitic vitrophyre that occupies a late Eocene to early Oligocene volcanic-tectonic basin near Silver Cliff, Colorado. Diameters of the megaspherulites range from 0.3 to over 3.66 m, including an alteration layer. The megaspherulites are compo…
Abstract The mechanisms and kinetics of the ageing process of polytetrafluoroethylene (PTFE) samples stored in either phosphate‐buffered saline (PBS) or air for periods of up to 1 month have been investigated. Changes of surface chemistry and wettability were studied as a function of ageing time using the complementar…
The third nonlinear optical susceptibility (χ〈3〉) of a new family of octupolar molecules with one, two, and three double bonds has been measured at 532 in tetrahydrofuran solutions by the degenerate four-wave mixing (DFWM) method. For comparison, we also measured the analogous dipolar subunits of the molecules. The se…
Porphyrins can be substituted easily and in high yield at the meso positions by using organolithium reagents. When S4-symmetric porphyrins such as 2,3,7,8,12,13,17,18-octaethylporphyrins are used as starting materials, it is possible to perform four such substitution reactions in sequence, resulting in the formation o…
The formation process of point defect clusters in high-purity (99.999%) iron as a typical bcc metal under the irradiation with low-energy (5 keV)He+ is studied by in situ transmission electron microscopy (TEM). Using conventional TEM techniques, clusters induced by the irradiation are determined to be interstitial-typ…
Leakage current measurements are performed on prototype cells revealing an S-shaped current versus voltage curve. This result indicates the presence of ion generation and recombination in the liquid crystal bulk. The compensation of the electrical field and the saturation current are related to the alignment layer thi…
The operation of railway track is likely to involve the presence of solid contaminants on the line at some stage. This may be from the dispersion of freight goods such as coal or minerals, or the presence of ballast stone thrown on to the track either by the passage of the train or during ballast cleaning operations.…
In the framework of the Peierls model generalized to two dimensions the dissociation of a dislocation in the {111} plane of a fcc lattice into two Shockley partials is studied by a variational procedure. Each partial is made up by a distribution of infinitesimal dislocations with a density obtained by a superposition…
Microstructural development of thin‐film barium strontium titanate (Ba x Sr 1– x TiO 3 ) as a function of strontium concentration and thermal treatment were studied, using transmission electron microscopy (TEM) and X‐ray diffractometry (XRD). Thin films, ∼250 nm thick, were spin‐coated onto Pt/Ti/SiO 2 /Si substrates,…