Materials Literature
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Recent development of diamond field emitter cathodes and devices fabricated from molding process is presented. Practical modifications involving the sp2 content, surface treatment, boron doping, and tip sharpening to further enhance diamond field emission are discussed. A new fabrication process for achieving ultrasha…
New efficient mechanisms of long-wavelength excitation of short-wavelength luminescence in a system of rare-earth impurity ions are proposed. The model studied involves a multilevel system of electronic states of a rare-earth ion interacting with the long-wavelength emission that is in resonance with one or several tr…
Benzylated fibre (BzF) was produced from fibres of oil palm empty fruit bunches (EFBs) using benzyl chloride in an etherification reaction for 2 h at two reaction temperatures, 100°C and 110°C. Estimates based on X-ray diffraction data show decreases of approximately 15 and 17%, respectively, in the crystallinity of c…
Abstract Raman spectra of two spin‐transition polymers, [Fe(NH 2 trz) 3 ](ClO 4 ) 2 and [Fe(Htrz) 3 ](ClO 4 ) 2 , where NH 2 trz=4‐NH 2 ‐1,2,4‐triazole and Htrz=1‐H‐1,2,4‐triazole, were investigated. The low‐temperature high‐spin to low‐spin phase transition of [Fe(NH 2 trz) 3 ](ClO 4 ) 2 is reported. The increasing i…
The microstructural features and tensile creep behavior of Al 2 O 3 doped with Nd 2 O 3 at levels ranging from 100 to 1000 ppm (Nd:Al atomic ratio) were systematically investigated. Compositional mapping, using both high‐resolution scanning transmission electron microscopy and secondary ion mass spectroscopy revealed…
Various aspects of in situ formation of Al 2 O 3 –SiC composites by the self‐propagating high‐temperature synthesis (SHS) technique have been investigated using thermal analyses (TG/DTA) of a powder mixture (4Al, 3SiO 2 , 3C) and pellets in an argon atmosphere at different heating rates. Both the reaction initiation a…
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…