Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Lasing that is color‐tunable via application of an electric field has been demonstrated at the edge of the 1D photonic band of a dye‐doped chiral smectic liquid crystal with a periodic spiral structure. The lasing wavelength, which can be shifted by 40 nm using a relatively low electric field, is tuned by the electric…
Photochromic dye (pyrene)–conducting polymer (polypyrrole) core–shell nanomaterials were fabricated using microemulsion micelles as nanoreactors. The adsorption state of pyrene was tunable over a wide range with a small pyrene loading because of the phase separation and the packing constraints of the pyrene crystal. T…
Arrays of 40 nm Bi 2– x Sb x Te 3 nanowires ( x ∼ 0.7, density ∼ 5 × 10 10 cm –2 ) have been synthesized. The individual wires are crystalline, relatively homogeneous, and highly textured in a 〈110〉 direction after thermal treatment. Wires containing Sb exhibit incomplete wetting of the alumina templates in which they…
Charge distributions in the donor layer for the paramagnetic semimetal-like and nonmagnetic insulating phases of the $\ensuremath{\alpha}\ensuremath{-}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm{I}}_{3}$ single crystal [BEDT-TTF: bis(ethylenedithiolo)tetrathiafu…
Current-density-functional theory is used to calculate ionization energies of current-carrying atomic states. A perturbative approximation to full current-density-functional theory is implemented for the first time, and found to be numerically feasible. Different parametrizations for the current-dependence of the dens…
We have studied the approach to equilibrium of islands and pores in two dimensions. The two-regime scenario observed when islands evolve according to a set of particular rules, namely relaxation by steps at low temperature and smooth at high temperature, is generalized to a wide class of kinetic models and the two kin…
Recent measurements of the anisotropy of the upper critical field Bc2 on MgB2 single crystals have shown a puzzling strong temperature dependence. Here, we present a calculation of the upper critical field based on a detailed modeling of bandstructure calculations that takes into account both the unusual Fermi surface…
Using a first-principle pseudopotential approach, we have investigated the Schottky barrier heights of abrupt Al/Ge, Al/GaAs, Al/AlAs, and Al/ZnSe (100) junctions, and their dependence on the semiconductor chemical composition and surface termination. A model based on linear-response theory is developed, which provide…
Ni-Mn-Ga is interesting as a prototype of a magnetic shape-memory alloy showing large magnetic-field-induced strains. We present here results for the magnetic ordering of Mn-rich Ni-Mn-Ga alloys based on both experiments and theory. Experimental trends for the composition dependence of the magnetization are measured b…
A novel method for detection of noble-metal nanoparticles by their nonlinear optical properties is presented and applied for specific labeling of cellular organelles. When illuminated by laser light in resonance with their plasmon frequency these nanoparticles generate an enhanced multiphoton signal. This enhanced sig…
By using nanosized doping agents , the properties of Ti‐catalyzed NaAlH 4 storage systems are considerably improved. Hydrogenation–dehydrogenation cyclic testing shows that with nanosized TiN dopants, storage capacities of 5 wt.‐% H 2 could be achieved. Doping with nanosized Ti brought hydrogenation times close to tho…
Abstract Amorphous calcium carbonate (ACC) in its pure form is highly unstable, yet some organisms produce stable ACC, and cases are known in which ACC functions as a transient precursor of more stable crystalline aragonite or calcite. Studies of biogenic ACC show that there are significant structural differences, inc…
The optical properties of a Ce 3+ -ion-doped LiCaAlF 6 (Ce:LiCAF) crystal is investigated in the vacuum ultraviolet (VUV) region. It is found that the optical excitation from the valence band of the LiCAF crystal to the 2 E g excited state of Ce 3+ can be utilized as an efficient excitation channel to obtain an ultrav…
The equipment for the evaluation of the figure of merit ZT has been fabricated and ZT values have been estimated for thermoelectric devices and modules which were simultaneously prepared using the same materials. It is pointed out that the thermoelectric loss from an electrode and a solder as the binder between the p-…
Zn 2 SiO 4 :Mn phosphors for plasma display panels (PDP) application were synthesized by large-scale ultrasonic spray pyrolysis process using metal alkoxide precursor. To avoid the formation of irregular-shaped particles owing to the hollowness and phase-segregation characteristics of the silicon component, organic ad…
y presenta características de ambiente meso-eutrófico.La comunidad fitoplanctónica está dominada por diatomeas del género Melosira (Aulacoseira spp), en casi todo el sistema y durante gran parte del año, siendo acompañadas por cyanobacterias Microcystis aeruginosa en los brazos Gualeguaycito y Mandisoví (margen argent…
Structure, Chemical Bonding and These Thermal Stabilities of Diamond-Like Carbon (DLC) Films by RF Magnetron Sputtering, Nakazawa, Hideki, Mikami, Takamasa, Enta, Yoshiharu, Suemitsu, Maki, Mashita, Masao
Crystals of Ca 3 Co 4 O 9 were grown by a solution method. We found that an appropriate amount of KCl addition to the K 2 CO 3 flux can facilitate the growth of Ca 3 Co 4 O 9 crystals and suppress the crystallization of Ca 3 Co 2 O 6 , which is the decomposed phase of Ca 3 Co 4 O 9 . Using a flux composition of K 2 CO…
Highly integrated field emitter arrays (FEAs) have been fabricated by the transfer mold technique to obtain highly uniform and stable field emission for highly efficient and reliable vacuum microelectronic devices. Transfer mold Mo FEAs containing 9,400,000 emitter tips with high emitter density of 7,840,000 tips/cm 2…
Chalcogenide glasses are promising candidates for all-optical switching and various nonlinear applications. However, we show that As2S3 thin films are photosensitive at wavelengths in the 1.5-microm telecommunication window. This sensitivity is evidenced by the formation of self-written waveguides in slabs, where chan…