Materials Literature
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Field emission from carbon nanotubes can be affected by common carbon- containing residual gases in vacuum systems. In this article, we will show the effects of CO, CO2, CH4, and C2H4 gases on the field-emission currents of patterned multiwalled carbon-nanotube arrays prepared by chemical vapor deposition. Exposure to…
An icosahedral quasicrystalline alloy in the Al-Fe-Cu system has been mechanically milled in a high-energy ball mill (Szegvari attritor) for 1, 3, 6 and 10 h. Samples were characterized by X-ray diffraction and transmission electron microscopy. The evolution of nanosize crystallites of the disordered B2 phase (bcc; a…
A novel porous silica matrix has been prepared from Pyrex glass, using hydrothermal treatment under saturated‐steam condition. This process makes it possible to obtain, in one step, a silica support formed of a homogeneously distributed and interconnected macropore microstructure. The new matrix contains silanol group…
Abstract Ruthenium nanoparticles included in alumina membranes have been prepared either by dihydrogen decomposition of the complex Ru(COD)(COT) (COD = 1, 5‐cyclooctadiene; COT = 1, 3, 5‐cyclooctatriene) to give pre‐prepared colloidal solutions which were further used to fill the pores of nanoporous alumina membranes…
Combustibility of polyurethane foam is an important industry issue. Many test methods are in place to characterize foam combustion, and legislation exists to ensure that the foam complies with specified standards. This paper provides a basic understanding of foam combustibility based on the British Standard BS5852 tes…
Optical studies have been conducted as a function of temperature on two (CCH3 and CCH7) of the three odd members of the homologous series of the mesogen trans, trans-4′-alkyl-bicyclohexyl-4-carbonitrite. From birefringence studies the variation of the orientational order parameter ⟨ P2 ⟩ with temperature of the two me…
Sintered α-SiC ceramics containing B4C with various 10B concentrations were neutron-irradiated, and the helium release rate during increasing annealing temperature was observed. The lattice parameter and the macroscopic length changes of the same specimens were also observed. The helium release rate from powdered spec…
Si 3 N 4 /carbon fiber composites were fabricated using several types of fiber. All the composites had higher fracture toughness compared with monolithic Si 3 N 4 ceramics. Tribological properties were investigated by a ball‐on‐disk method under unlubricated conditions. The composite containing fibers with a high orie…
Abstract This paper deals with the numerical simulation of fluid flow and heat transfer in a silicon floating zone (FZ) subjected to axial vibrations. Corresponding experiments were performed under microgravity conditions within the framework of the European sounding rocket Maxus‐4 flight. The study concerns a liquid…
The synthesis and characterization of new hyperbranched organosilicon polymers containing furan or thiophene are described. The air- and moisture-stable polymers were prepared in 78−98% yields by the platinum-catalyzed hydrosilylation polymerization of AB 2 and AB 3 silyl-substituted furans and thiophenes. Complete po…
Cu-based alloys have been used for electric cables for long time. In the field of microelectronics, Al had been used for electrical wiring. However, it became clear that electromigration occurs in Al that causes breaking of wires in minute wirings. Due to this problem, Cu wiring is used in most advanced microprocessor…
Abstract The structure of polypropylene fibers formed by different spinning conditions was studied. The investigations were carried out using wide‐angle X‐ray scattering (WAXS) and small‐angle X‐ray scattering (SAXS) methods. It was stated that in noncolored fibers the mesophase and the monoclinic α forms were formed.…
The effects of irradiation up to 20 dpa on the Charpy impact properties of reduced-activation ferritic/martensitic steels (RAFs) were investigated. The ductile-brittle transition temperature (DBTT) of F82H-IEA shifted up to around 323K. TIG weldments of F82H showed a fairly small variation on their impact properties.…
A forced‐flow reactor has been designed for the synthesis of nanocrystalline AlN via in situ and ex situ nitridation of aluminum. Various reactor parameters, including evaporation temperature, microwave plasma generation, reactor pressure, gas flow rate, nitriding gas, carrier gas, and crucible purge, have been examin…
Abstract Diffusion measurements of metallic and semiconductor melts on earth show highly irreproducible results due to occurrence of unknown convection. Therefore we investigated the influence of different kinds of additional transports. Diffusion experiments with the shear cell technique and numerical simulations hav…
We present a way to fabricate microgrippers that can meet the industry's needs well, i.e., low cost and large tip deflection, etc. The microgripper is fabricated by bonding two identical micro NiTi-Si cantilever beams together with a silicon spacer in between. It can be actuated by electrical current directly. We have…
Detailed power loss distribution in induction machines is assessed using time-stepped finite-element analysis coupled to circuit equations of an inverter. Losses are examined for various load conditions. Iron losses are largely unexplored and so particular attention is paid to them here. The simulation has revealed th…
In experimental mass spectra of lead-sodium mixed clusters, an exceptionally abundant and stable ${\mathrm{Na}}_{6}\mathrm{Pb}$ cluster has been discovered [C. H. Yeretzian et al., Chem. Phys. Lett. 237, 334 (1995)]. By using first-principles calculations, several cluster assemblies based on the ${\mathrm{Na}}_{6}\mat…
Amphiboles were hydrothermally synthesized at 500 °C and 4 kbar in the system Li 2 O-Na 2 OFeO- Fe 2 O 3 -SiO 2 -H 2 O, with nominal compositions along the riebeckite [□Na 2 Fe 3 2+ Fe 2 3+ Si 8 O 22 (OH) 2 ]-ferri-clinoferroholmquistite [□Li 2 Fe 3 2+ Fe 2 3+ Si 8 O 22 (OH) 2 ] join, where the exchange vector is NaLi…
In this paper we report the effects of formulation on texture development for the “reactive‐templated grain growth” (RTGG) of Bi 1/2 (Na,K) 1/2 TiO 3 (BNKT). The solids formulation for BNKT was systematically varied by prereacting to well—defined alkali and bismuth titanates (Na 2 Ti 3 O 7 (N 2 T 3 ), K 2 Ti 2 O 5 (K…