Materials Literature
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Life tests of a skutterudites unicouple (MAR-03) comprised of CeFe/sub 3.5/Co/sub 0.5/Sb/sub 12/ P-leg and CoSb/sub 3/ N-leg are performed. The tests, which are performed in argon at 0.051-0.068 MPa to suppress the antimony (Sb) sublimation from the N- and P-legs near the hot shoe, lasted for 450 hours, of which 261 h…
We report on the superconductivity of lanthanum-doped SrTiO3 thin films grown by off-axis laser ablation on LaAlO3, SrTiO3, and NdGaO3 substrates in oxygen partial pressures ranging from 10−8 T to 21 mTorr. The La/Sr doping ratio of the ablation target was 1%. The resulting films have carrier densities measured in the…
Based on the classical kinetic concept of solid fracture and a strain concentration concept, a model is proposed for predicting time-dependent fracture of carbon nanotubes. The time-dependent fracture behavior of a zigzag type single-walled carbon nanotube with a range of preexisting cracks under tension is studied by…
Time-resolved multiphoton-excited fluorescence microscopy is used to study electric-field-induced reorientation dynamics in single liquid crystal (LC) droplets within polymer-dispersed liquid crystal films. Films comprised of nematic LC dispersed in a poly(isobutyl methacrylate) matrix are characterized. An electric f…
The influence of the geometrical configuration of three single-core cable lines on the generated magnetic field is evaluated in the preliminary analysis. Numerical and experimental procedures are applied to estimate the performances of open or closed shields made of conductive or magnetic materials. A new high-voltage…
Potassium-doped superactivated carbon can adsorb 1.6 wt % of hydrogen at room temperature under 5 MPa. This value was greater than that of potassium-doped graphite (hydrogen adsorption capacity: 1.0 wt %). Kinetics of the hydrogen adsorption of the potassium-doped superactivated carbon was remarkably improved. The hyd…
The effect of pH on the gelation time of hexylene-bridged polysilsesquioxanes was determined with the sol−gel polymerization of 1,6-bis(trimethoxysilyl)hexane (1) in methanol. Gel times formed a crude bell curve plotted against pH with the longest gel times of 660 h near pH 5. This represents the first systematic stud…
The surface tension of superheated and undercooled liquid Ni–5 wt % Si alloy was measured by an electromagnetic oscillating drop method over a wide temperature range from 1417 to 1994 K. The maximum undercooling of 206 K (0.13 TL) was achieved. The surface tension of liquid Ni–5 wt % Si alloy is 1.697 N m−1 at the liq…
In many transition-metal compounds, in particular those containing ${\mathrm{Fe}}^{2+}$ and ${\mathrm{Co}}^{3+},$ there occur spin-state transitions between low-spin and high-spin (or intermediate-spin) states. We show that typical interactions between similar spin-state ions are short-range repulsion and long-range i…
The quasicrystal approximant Eu(4)Cd(25), formerly designated EuCd(6), was synthesized and characterized by means of single-crystal X-ray diffraction. Superstructure reflections corresponding to an F-centered cubic unit cell with a doubled cell-parameter relative to the I-centered cubic sub-cell could be observed in t…
The twin-boundary motion in Ni–Mn–Ga single crystals has been studied with 620 μs magnetic-field pulses on samples of 5 mm×5 mm cross section and 10 mm in length. A sequence of pulses applied on a single variant induces an extension. It is close to linear with the pulse’s peak generated driving forces, for peaks in ex…
Hot-press sintered thermoelectric elements of intermetallic compounds: Mg/sub 3/Bi/sub 2/ and Mg/sub 3/Sb/sub 2/ were examined for the feasibility as medium temperature range thermoelectric elements, which belong to the family of zinc blend crystal structure. The experiments were carried out varying the sintering temp…
Abstract Montmorillonite (MMT)‐based polyimide (PI) nanocomposites were prepared via two‐stage polymerization of PI using polyamic acid (PAA). The clay was organically modified using various alkylammonium ions to examine the effect of changes in alkyl length on the intercalation spacing of both the treated clays and t…
An air conditioning system for housing has been designed. It is based on the thermoelectricity technology and supplied with photovoltaic solar panels. The equipment has a power of 1400 W and consists of 48 Peltier pellets, integrated in the ceiling of the room, with aluminium plates as heat exchangers. For the design…
Void formation and growth is a major problem for solder interface materials, because they impede heat conduction from the silicon die to heat spreader/heat sink in semiconductor electronic devices. This work uses infrared microscopy to measure temperature distributions on the interfacial layer through the silicon die.…
Abstract Melt intercalation of the methylsilylated organoclays with polar polymers such as SAN was examined to verify the adhesive role of guest polymeric chains between hydrophilic clay layers, so‐called “glue effect” on intercalation behavior. Once methylsilylated organoclay was melt‐blended with SAN, it was found t…
Abstract The mechanism and kinetics of the thermal cure reaction of two cyanate esters (CEs), 1,1′bis(4‐cyanatophenyl)ethane (AroCy L‐10) and bisphenol A dicyanate ester (BADCy), in the presence of dibutyl tin dilaurate (DBTDL) has been investigated using Fourier‐transform infrared spectroscopy (FTIR) and High‐perform…
As the trend of highly integrated electronics and simultaneous miniaturization escalates to include faster processors, more functions, and higher bandwidths, electronics continue to become more compact in response to size limitations and strict reliability requirements. The result is an increasing heat flux at both th…
A simple chemical vapor deposition in a graphite crucible was employed in the development of two-dimensional nanomaterials of boron carbide. The sole starting material was B 2 O 3 powder, and the deposition was undertaken on a chemically and thermally stable insulating template, graphitic boron nitride. The majority o…
High-field magnetization and susceptibility measurements have been performed on $S=1$ antiferromagnetic bond-alternating chain compounds: $[{\mathrm{Ni}}_{2}(\mathrm{dpt}{)}_{2}(\ensuremath{\mu}\ensuremath{-}\mathrm{ox})(\ensuremath{\mu}\ensuremath{-}{\mathrm{N}}_{3})]$$({\mathrm{PF}}_{6})$ [dpt=bis(3-aminopropyl)amin…