Materials Literature
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Building on the ferroelectric family based on the Bi(Me+3)O3–PbTiO3 solid solutions, the complex solid solution (1−x)Bi(Mg3∕4W1∕4)O3–xPbTiO3 [(1−x)BMW–xPT] was investigated. This system was found to exhibit a broad morphotropic phase boundary at x∼0.48mol% PbTiO3 with a corresponding Curie temperature of 205°C separat…
Transistors with gate lengths below 100 nm generate phonon hotspots with dimensions on the order of 10 nm and peak power densities of about 50W∕μm3. This work employs molecular dynamics to investigate the impact of lattice energy density on phonon scattering at the hotspot. The hotspot studied in this work consists of…
Differential scanning calorimetry, in conjunction with x-ray and electron diffraction, is used to investigate the A1 to L10 ordering transformation in binary FePt films with compositions in the range of 47.5–54.4at.% Fe. The kinetic ordering temperature, taken as the calorimetric peak temperature at a heating rate of…
Helicity has been induced in meso-meso linked oligomers by hydrogen bonding host-guest interactions with cyclic urea. Helical porphyrin arrays thus formed exhibit chirality amplification and enhanced two-photon absorption properties.
Time delay estimation (TDE) is essential for PD location using the UHF technique. However, noise and effects of multi-path propagation are two main problems affecting the accuracy of the estimate. Comparing two methods, which are based on the cumulative energy curve and power curve respectively, a cross correlation ba…
The hydrophobicity status of silicone rubber (SIR) is affected by various factors. In order to study the influence of temperature on the hydrophobicity of silicone rubber, three kinds of SIR samples, which are clean surface, contaminated, and corona treated ones, were used. The static contact angle of a water droplet…
Ru(II)- and Os(II)-polypyridine termini are linked by a quinquethiophene bridge (the inter-metal separation is ca. 1.9 nm) wherein excitation energy flows into the luminescent Os-based unit by way of a conductive level.
Multiwalled carbon nanotubes (MWCNTs) were expanded by 2.5 times in diameter through high-energy (MeV) ion irradiation. Pristine MWCNTs were synthesized onto SiO2 substrate by chemical vapor deposition. The 4MeV Cl2+ ions with a dose of 3×1016ions∕cm2 were irradiated on MWCNTs. From high-resolution transmission electr…
The region-by-region polarization switching in ferroelectric Pb(Zr,Ti)O3 thin films sandwiched between Pt electrodes has been directly observed using piezoelectric scanning probe microscopy. A resolution improved by one order-of-magnitude compared to the standard piezoelectric response imaging technique for ferroelect…
Here we describe the fabrication of nanocomposite-based microcatheter through-melt extrusion utilizing high-purity carbon nanotubes as filler and nylon as matrix. Homogeneous dispersion of carbon nanotubes in nylon can provide novel microcatheters with enhanced mechanical properties (easier to handle) and extremely re…
The microscopic origin of ferroelectric instabilities in Aurivillius compounds is investigated from first principles using the full-potential linearized augmented plane-wave method. A comparative study of the ferroelectric instabilities in archetype materials like ${\mathrm{Bi}}_{2}{\mathrm{WO}}_{6}$, ${\mathrm{SrBi}}…
Thermodynamic properties of $\mathrm{Ca}\mathrm{W}{\mathrm{O}}_{4}$ were studied using the GULP code incorporating semiclassical simulations based on quasiharmonic lattice dynamics and static lattice minimisation methods. Free energy minimization along with so called ``relax'' fitting was used to obtain the parameters…
Partial discharge (PD) degradation was investigated to compare polyamide nanocomposites with two kinds of polyamide microcomposites. Such materials were exposed to PDs under the IEC(b) electrode configuration for evaluation of PD resistance. Comparisons were made as to the surface roughness using a scanning electron m…
A series of O18 tracer in-diffusion experiments have been conducted on state-of-the-art metal organic chemical vapor deposition–grown Pb(Zr,Ti)O3 (PZT) films. Prior to O18 incorporation, samples were preequilibrated in O216 at the same temperature and total pressure used for the following O218 isotope exchange anneal.…
A study of Fe-ZSM-5 catalysts with variable amounts of isolated, oligomeric and heavily aggregated Fe3+ oxo sites (as evidenced by UV-Vis and EPR spectroscopic data) and their catalytic properties in the selective catalytic reduction of NO by isobutane or by NH3 is presented, which allows development of a unified conc…
Ferromagnetic resonance (FMR) and ac conductivity have been applied to study a polymer composite containing as filler a binary mixture of magnetite (Fe3O4) and cementite (Fe3C) nanoparticles (30–50nm) dispersed in a diamagnetic carbon matrix, which was synthesized by the carburization of nanocrystalline iron. Ac condu…
It has been demonstrated that the electrical breakdown properties of polymer composites can be substantially enhanced when the filler particles are of nanometric dimensions. These benefits are likely related to the mitigation and redistribution of internal charge. Using the example of an epoxy-TiO/sub 2/ nanodielectri…
In the study, various amounts of nano- and micro-scale zinc oxide particles (62 nm and 1 /spl mu/m average diameter) were systematically introduced into an Araldite epoxy resin matrix for reinforcement purposes. The influence of these particles on the electrical treeing breakdown resistance was investigated experiment…
Porous and nonporous metallic Ag nanostructures were fabricated with ease by using cellulose fiber as a template.
The air oxidation kinetics of low coverages of ∼5nm Si nanoparticles, deposited by pulsed excimer laser ablation (KrF, 248 nm) in He, have been characterized by x-ray photoelectron spectroscopy. A simple model, based on the evolution of the Si 2p spectral components during oxidation, has been developed to determine th…