Materials Literature
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We present a simple technique for the calibration, prediction, and optimization of the optical modulation properties of a liquid-crystal display (LCD). The method is useful when there is no information about the internal fabrication parameters of the device (the orientation of liquid-crystal molecules, the twist angle…
We have investigated nonalloyed Al/Pt ohmic contacts on n-type ZnO:Al (nd=2.0×1018 cm−3). It is shown that the as-deposited Al/Pt contacts produce a specific contact resistivity of 1.2×10−5 Ω cm2. Auger electron spectroscopy and x-ray photoelectron spectroscopy depth profile results show interdiffusion between oxygen…
Nanostructured graphitelike carbon films are prepared through a simple pyrolysis method. The as-prepared films are superhydrophobic for not only pure water but also corrosive liquids, such as acidic and basic solutions. The picture shows water droplets with pH values of 1.07 (left) and 13.76 (right) in contact with a…
A combined hot filament/direct current (dc) plasma approach to chemical vapor deposition of carbon nanofibers (CNFs) using an acetylene/ammonia feedstock has been explored. As a part of the study, the impact of filament usage and substrate holder design has been examined by scanning electron microscopy imaging of depo…
A mixed-valence polyoxomolybdate cluster [H2MoVI12MoV4O52]10− was isolated by a new “shrink-wrapping” approach to trap clusters that display low symmetry and nonspherical topology (see scheme; HMTAH=protonated hexamethylenetetraamine). The unprecedented cluster topology results from the restriction of the reorganizati…
Kontrollierte Formgebung: Eindimensionales mesostrukturiertes Siliciumdioxid wird mithilfe von Aluminiumoxidmembranen aufgebaut. Die Benetzungseigenschaften der porösen Aluminiumoxidschicht sind dabei entscheidend für die gezielte Herstellung von Nanofasern und Nanoröhren; die Konzentration eines Tensides bestimmt die…
Taking control: One-dimensional mesostructured silica materials and their arrays are prepared in anodic alumina membranes. By adjusting the wettability of the alumina pore wall, nanofibers and nanotubes are prepared in a controlled way. The mesostructured silica morphology (see picture) can be adjusted by changing the…
A long-lived charge-separated state, SWNT.−–Fc.+, is formed by photoinduced electron transfer in a novel single-wall carbon nanotube–ferrocene (SWNT–Fc) nanohybrid. The presence of SWNT.−, detected by laser flash photolysis, was confirmed by time-resolved pulse radiolysis and steady-state bulk electrolysis.
The effects of processing conditions and crystallographic orientation of growing dendrites on stray grain formation have been investigated in welds of single crystal Ni-base superalloys. The degree of constitutional supercooling (CS) at the solidification front has been used as a metric to quantify the effects. Numeri…
Eine bequeme Art der Energiespeicherung sind Lithium-Batterien, allerdings sind ihre Anoden aus natürlichem Graphit nicht vereinbar mit Elektrolyten auf Carbonat-Basis. Die Randflächen werden vom Elektrolyt angegriffen, wohingegen die Basisflächen inert bleiben. Durch Anwendung einer neuen Technik erhält man sphärisch…
Carbon Nanofilm with a New Structure and Property, Horiuchi, Shigeo, Gotou, Takuya, Fujiwara, Masahiro, Sotoaka, Ryuji, Hirata, Masukazu, Kimoto, Koji, Asaka, Toru, Yokosawa, Tadahiro, Matsui, Yoshio, Watanabe, Kenji, Sekita, Masami
Thin films of p-type Bi0.5Sb1.5Te3, n-type Bi2Te2.7Se0.3, and n-type (Bi2Te3)90(Sb2Te3)5(Sb2Se3)5 (with 0.13 wt % SbI3) were deposited on substrates of mica and aluminum nitride (on silicon) using pulsed laser ablation at substrate temperatures between 300 °C to 500 °C. The films were characterized using x-ray diffrac…
Raman light-scattering experiments in the antiferromagnetic phase of the Cu_2Te_2O_5(Br_(1-x)Cl_x)_2 compounds are analyzed in terms of a dimerized spin model for the tetrahedral Cu-clusters. It is shown that the longitudinal magnetic excitation in the pure Br system hybridizes with a localized singlet excitation due…
Real-time dynamics of charge density and lattice displacements is studied during photoinduced ionic-to-neutral phase transitions by using a one-dimensional extended Peierls-Hubbard model with alternating potentials for the one-dimensional mixed-stack charge-transfer complex, TTF-CA. The time-dependent Schr\"odinger eq…
The principal fact that the pyroelectric vector $\Pb^0$ typical of polar crystals is invisible in equilibrium has been verified. Nevertheless, the general formula for $\Pb^0$ as a definite bulk quantity associated only with the inversion properties of a given charge distribution in the bulk has been obtained. Its appl…
Using atomistic models and molecular dynamics simulations, interlayer corrugation and resistant force in a biwalled carbon nanotube are shown to be strongly dependent upon the morphology combination of the bitube. Consequently, energy dissipation in a commensurate (e.g., armchair/armchair or zigzag/zigzag) bitube osci…
The phase behaviors of the blends of diblock copolymers and random copolymers were investigated with synchrotron small-angle X-ray scattering, light scattering, differential scanning calorimetry, and transmission electron microscopy techniques. The temperature, T ODT, at which the order−disorder transition (ODT) takes…
Three magnetization curves of Si0.93Mn0.07 film annealed at 973 K were taken at 5, 100, and 200 K after substraction of the diamagnetic contribution of the Si substrate. The coercive field decreases monotonically with increasing temperature. For our samples, the coercive fields, Hc, are 320, 150, and 70 Oe at 5, 100,…
We introduce a completely new and innovative method of producing polymer/nanotube composites where the density and position of the nanotubes within the composite can be controlled. Carbon nanotubes are grown from organometallic micropatterns. These periodic nanotube arrays are then incorporated into a polymer matrix b…
The glass transition behavior of polyacrylamide (PAL) was investigated in the bulk entangled state, the single-chain isolated state, and the partially entangled state. It was observed that the glass transition temperature increases as the degree of entanglement decreases. Single-chain nanoglobules of PAL were prepared…