Materials Literature
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Silicon charge-coupled devices (CCDs) covered with a scintillating film are now available on the market for use in digital medical imaging. However, these devices could still be improved in terms of sensitivity and especially spatial resolution by coating the CCD with an array of scintillating waveguides. In this pape…
We numerically study phase-separation dynamics of symmetric mixtures of an isotropic liquid and a liquid crystal, incorporating nematohydrodynamics, for the first time. We find that the hydrodynamics not only accelerates the domain growth, but also leads to the breakdown of the morphological symmetry of the two phases…
Abstract Silica‐supported polyamidoamine (PAMAM) dendrimers with different spacer lengths were prepared. After the introduction of diphenylphosphino groups, complexation to dibenzylidenepalladium(0) gave the desired silica‐supported dendrimer–palladium catalyst complexes G0 to G4‐C2‐Pd. These catalysts showed activity…
The smallest mark which can be produced in phase-change recordings has been explored using an atomic force microscope. Electrical pulses applied to amorphous Ge 2 Sb 2 Te 5 films through conducting cantilevers can produce crystalline marks, the size decreasing with decreases in input power, pulse duration, and film th…
Failure modes for inter-level dielectric layers under accelerated test conditions have been evaluated for a range of dielectric diffusion barriers in copper/low-k structures. The dominant failure mechanism for both constant voltage tests and ramped voltage tests was mechanical cracking at the dielectric barrier/low-k…
Strong green-light emission occurs in Eu:SrAl2O4 ceramics and Eu:SrAl2O4/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) composites when excited by a lower dc or ac voltage. That emission is caused by strong electric-mechanic-optic interaction. The composite shows stronger luminescent emission intensity in c…
Abstract Porous TiNi shape‐memory alloy (TiNi SMA) bodies with controlled pore structure were produced from the (Ti+Ni) powder mixture by self‐propagating high‐temperature synthesis (SHS) method. The effect of processing variables such as the kind of starting powders, ignition temperature and preheating schedule on th…
The reaction kinetics and mechanisms between 8 mol% yttria‐stabilized zirconia (YSZ) and 30 mol% Sr‐doped lanthanum manganite (La 0.65 Sr 0.30 MnO 3 , LSM) with A‐site deficiency for the application of planar solid oxide fuel cells (SOFCs) were investigated. The LSM/YSZ green tapes were cofired from 1200° to 1400°C fo…
In this letter we report a “one-step” fabrication technique of an optical active organic photonic band gap (PBG) structure allowing the onset of the amplification spontaneous emission effect and narrowing of the corresponding band. This result has been achieved through the addition of the dye rhodamine 6G to a standar…
Abstract Polystyrene‐based nanocomposites (PNC) were prepared using three grades of polystyrene (different molecular weights). The resin was melt‐compounded with 0 to 10 wt% of commercial organoclay in a co‐rotating twin‐screw extruder. Owing to thermo‐oxidative degradation the degree of dispersion was poor. The rheol…
Abstract Nanocomposites are a class of materials that use molecular‐sized particles for reinforcing the polymer matrix. These materials blend an organoclay with polymer to produce a composite with physical and mechanical properties equal to or better than their conventionally filled counterparts but at lower filler lo…
Continuous single-step fabrication of cubic nanocrystalline Y 2 O 3 :Eu 3+ phosphor particles using flame spray pyrolysis was successfully conducted without any post-heat treatments. The morphology of the as-prepared particles was spherical and nonaggregated. The mean size of as-prepared particles was easily controlle…
Abstract The thermal decomposition of hydrotalcite (HT), with chemical composition Mg 1- x Al x (OH) 2 (CO 3 ) x /2 .(1-3 x /2)H 2 O, (0.20 < x ≤ 0.33), is a complex sequence of dehydration, dehydroxylation and decarbonization and leads to the formation of a series of metaphases: HT-D (dehydrated HT), HT-B (partial…
In this paper we describe the lithographic behavior and related material properties of a new class of chemically amplified, positive tone, silicon-containing methacrylate photoresists incorporating the polyhedral oligomeric silsesquioxane (POSS) group as the etch-resistant component. POSS-bearing monomers were copolym…
Submicrometer TiC/SiC composites were fabricated by a rapid reactive sintering process through spark plasma sintering (SPS) technique using the carbon, titanium, and nanosized‐SiC powders without any additive. It was found that the composite could be sintered in a relatively short time (8 min at 1480°C) to 97.9% of th…
Ti3SiC2 combines many of the merits of both metals and ceramics and has potential in diverse high temperature applications. However, TiC always exists as an impurity phase, which is deleterious to the high-temperature oxidation resistance of Ti3SiC2. Although many attempts have been made, it is difficult to eliminate…
Abstract Two soil sequences in northern Italy (Val di Fiemme and Val Genova) along an elevational gradient ranging from moderate (950 m a.s.l.) to high alpine (2440 m a.s.l.) climate zones were investigated with respect to element losses (Ca, Mg, K, Na, Fe, Al, Si, Mn) and development of clay minerals. Soils formed on…
Abstract Summary: Star‐shaped hydroxy‐terminated poly( ε ‐caprolactone)s ( ss PCL), with arms of different lengths, were obtained by ring‐opening polymerization (ROP) of ε ‐caprolactone initiated by pentaerythritol, and were condensed with α ‐methyl‐ ω ‐(3‐carboxypropionyloxy)‐poly(ethylene oxide)s ( $\overline M _{\r…
A highly sensitive fiber-optic sensor based on optical beam deflection is applied for investigating the propagation of a laser-induced plasma shock wave, the oscillation of a cavitation bubble diameter, and the development of a bubble-collapse-induced shock wave when a Nd:YAG laser pulse is focused upon an aluminum su…
We have found strong visible photoluminescence (PL) from 0.4 nm carbon nanotubes embedded in the ordered channels of a zeolite crystal matrix. The PL exhibits a broad emission band with an efficiency of $\ensuremath{\sim}1%--5%$. Strong polarization dependence is observed both on the excitation and emission, indicatin…