Materials Literature
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Recent publications reported a large increase of conductivity in mesoporous silicon exposed to traces of nitrogen dioxide. The phenomenon has been studied from theoretical and experimental points of view. Even if a complete comprehension has not been reached yet, it seems clear that the simple increase in the number o…
Power module reliability can be increased if problems due to high electric fields can be better understood. This paper proposes a global analysis using finite element simulations. Results are confirmed thanks to optical detection of partial discharge localization. Solutions to reduce field reinforcement are proposed a…
Ethylene propylene diene rubber (EPDM) and styrene butadiene rubber (SBR) blends were compatibilized by a graft copolymer EPDM-graft-styrene. This compatibilizer was prepared by gamma radiation induced grafting of EPDM with styrene monomer. The compatibilized blends were evaluated by scanning electron microscope and d…
Comparison studies on effects of feldspar and silica (Vulcasil C) as a filler in (SMR L grade natural rubber) vulcanizates on curing characteristics, mechanical properties, swelling behavior, thermal analysis, and morphology were examined. The incorporation of both fillers increases the scorch time, t2, and cure time,…
This study was setup to investigate the design and performance of a shape memory alloy clip for colonic anastomosis. The thermo-mechanical properties of the shape memory alloy material were studied and the data were used to derive a nonlinear material model. This enabled the development of computer computer aided desi…
Surface modification of sapphire (0001) by Ga can eliminate multiple rotation domains in ZnO films. The existence of Ga at ZnO∕sapphire interface was confirmed by x-ray energy dispersive spectroscopy in a transmission electron microscope. Atomic detail of mismatch dislocations at interface was imaged by high resolutio…
An electrodynamic screen was designed, built, and tested for the removal of particles from its surface. The technology has a large number of applications ranging from space exploration to biotechnology. An AC signal was applied to the shield and it was studied the effect of its amplitude, shape, and frequency to the s…
We report on the use of in situ spectroscopic ellipsometry to determine the film thickness, optical constants, and growth rate for titanium films grown on silicon oxide by pulsed filtered cathodic vacuum arc. The growth rate and film thickness are shown to be highly controllable. We also report the results of simultan…
Abstract Melt reaction in blends comprising immiscible biopolymer, poly(3‐hydroxybutyrate) (PHB), and epoxidized natural rubber with 50 mol percent level of epoxidation (ENR‐50), prepared by solvent‐casting, has been studied. Differential scanning calorimetry (DSC) technique was used to measure the heat of reaction un…
It is suggested that an electric field above a given value eliminates the barriers to the transport of trapped charge carriers so as to produce an extended state in the form of a percolation cluster, and that the consequent current multiplication results in electrical breakdown. This model provides an estimated value…
We report on the fabrication of polymer waveguides containing infrared-emitting nanocrystal quantum dots. Both PbSe and InAs nanocrystal quantum dots are incorporated into a fluorinated polymer by a surface functionalization method. The optical properties of the nanocrystal quantum dots are shown to be unaffected by t…
When dielectric particles are reduced in size to nanometric dimensions less than 100 nm the interfaces between them and their surroundings increase greatly in importance. The nature of these interfaces is reviewed and it is shown that they have dielectric and conductive properties very different from those predicted b…
Abstract Natural rubber (NR) vulcanizates filled with various contents of carbon black were devulcanized in supercritical CO 2 in the presence of diphenyl disulfide as a devulcanizing reagent. The devulcanized rubbers were separated to sol and gel components using chloroform. Regardless of the carbon black content in…
We present hard x-ray photoemission measurements from GaAs samples with a 10-Å-thick layer of AlAs buried at different depths. The intensity trend versus kinetic energy of the Al 1s signal allows extraction of the x-ray attenuation length, which we find to reach ∼100Å at a kinetic energy of 6 keV. On one sample expose…
Introducing partial sum rules for the optical multiplet transitions, we outline a unified approach to magnetic and optical properties of strongly correlated transition metal oxides. On the example of ${\mathrm{LaVO}}_{3}$ we demonstrate how the temperature and polarization dependences of different components of the op…
Transduction of magnetoinductive waves (MIWs) in planar technology is demonstrated. A transducer consisting of a one-dimensional periodic array of metallic split squared ring resonators (SSRR), placed between a pair of microstrip lines on a planar substrate has been fabricated and measured. The microstrip lines are in…
We present an infrared (IR) optical absorbance study of highly uniform nanotubes grown by chemical vapor deposition in the self-assembled porous matrix in alumina. For unambiguous IR spectral measurement, nanotubes were extracted from their growth template, purified, and evenly dispersed on a reflecting substrate. The…
Optically active and electrically excitable erbium complexes on silicon are made by wet-chemical synthesis. The single-crystalline Er–Si–O compound is formed by coating a Si(100) substrate with an ErCl3∕ethanol solution, followed by rapid thermal oxidation and annealing. Room-temperature Er-related 1.53μm photolumines…
We report on the structural and optical properties of highly ordered porous alumina membranes (PAMs) under different annealing temperatures up to 1100°C. Clear structural transition from amorphous to γ- and then to α-Al2O3 has been demonstrated in PAMs through x-ray diffraction and micro-Raman scattering measurements.…
Previous work in which a conventional micron-sized filler was replaced by nanomaterials in an epoxy matrix has shown significant, and encouraging enhancements in the electric strength of the composites. The advantages gained were associated with the mitigation of Maxwell-Wagner polarization and the internal associated…