Materials Literature
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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…
The modification recently developed for polyethylene, based on the thermolysis of peroxyketals and peroxy esters in the molten polymer, was applied to atactic and isotactic polypropylene. The grafting of an ester function onto the backbone of these polyolefins was much less efficient in this case than for the former.…
On heating, syn-diporphyrin zinc complexes fused with bis(ethano)dimethoxyanthracene, the crystal structure of which showed a unique trimeric assembly, extruded one ethylene molecule at 240-310 degrees C to give a porphyrin-naphthoporphyrin diad, and the second retro-Diels-Alder reaction and concomitant decomposition…
Three new perovskites, CaCu 3 Ga 2 Sb 2 O 12, CaCu 3 Ga 2 Ta 2 O 12, and CaCu 3 Ga 2 Nb 2 O 12, have been synthesized at 12∼12.5 GPa and 1100 °C using the uniaxial split sphere anvil type press (USSA-2000) and recovered to ambient conditions, where they have been structurally characterized using X-ray and neutron powd…
It was demonstrated that zeolite can be used as a pseudo-template to grow very fine and uniform silicon nanostructures via disproportionation reaction of SiO by thermal evaporation. Three distinct types of composite nanowires and nanotubes of silicon and silica were grown on the surfaces of zeolite Y pellets. The firs…
PAMAM dendrimers from generations 1-6 were synthesized with pyridoxamine in their core. They transaminated pyruvic and phenylpyruvic acids in water to alanine and phenylalanine, respectively, with Michaelis-Menten kinetics and high effectiveness compared with simple pyridoxamine. The largest dendrimers-similar in size…