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。
Nanocrystalline TiN powder has been synthesized by the direct nitridation of nanocrystalline TiO 2 powder. Powder XRD patterns indicated that the TiN nanocrystalline powder could be obtained by nitridation at 800°C for 5 h. TEM micrographs showed that the synthesized TiN powders consisted of uniform spherical particle…
The thermal oxidative stability of an epoxide/diamine network (TGDDM/DDS) and of an epoxide/diamine/bismaleimide IPN system (TGDDM/DDS/BMI) have been investigated by thermogravimetric analysis (TGA), dynamic-mechanical thermal analysis (DMTA) and isothermal, time-resolved FTIR spectroscopy. Both TGA and DMTA data reve…
The phase behavior and hydrogen bonding in ternary polymer blends of phenolic resin, poly(ethylene oxide) (PEO), and poly(ε-caprolactone) (PCL) were investigated by using differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). Although all three binary blends are respective miscible…
This paper starts with the description of a purely mathematical model of the saturation curve and the hysteresis loop based on the fundamental similarities between the Langevin function the specified T(x) function and the sigmoid shape. The T(x) function which is composed of tangent hyperbolic and linear functions wit…
Caulobacter crescentus was investigated with respect to polyhydroxybutyrate (PHB) biosynthesis. Polyhydroxyalkanoate (PHA) accumulation contributing to approximately 18% of the cell dry weight was obtained in the presence of glucose. Gas chromatography-mass spectrometry and gel permeation chromatography of the purifie…
Templated synthesis of polythiophene micro- and nanotubules using an alumina membrane is described here. Flexible polythiophene tubules up to 60 μm in length and aligned tubule/gold bilayer films (see Figure) with an area as large as 1.8 cm2 can be obtained. These bilayer films show broad, strong redox responses with…
Different ternary carbide phases, namely Ti 3 AlC 2 , Ti 3 AlC, and Ti 2 AlC, were successfully synthesized in a self‐sustaining regime. Direct reactions among elemental powders of titanium, aluminum, and carbon are strongly exothermic, and the resulting reaction products consist of binary carbides and they are partia…
Electronic structure calculations of BiB3O6 crystal from first principles are performed based on a plane-wave pseudopotential method. The linear refractive indices and the static second-harmonic generation (SHG) coefficients are also calculated by the SHG formula improved by our group. The calculated values are in goo…
Microstructure‐level residual stresses occur in polycrystalline ceramics during processing, as a result of thermal expansion anisotropy and crystallographic misorientation across the grain boundaries. Depending on the grain size, the magnitude of these stresses can be sufficiently high to cause spontaneous microcracki…
We demonstrate electrical electron spin injection via interband tunneling in ferromagnetic/nonmagnetic semiconductor Esaki diodes. An interband tunnel junction between ferromagnetic p + -(Ga,Mn)As and nonmagnetic n + -GaAs under reverse-bias allows spin-polarized tunneling of electrons from the valence band of (Ga, Mn…
We used local thermal analysis and ellipsometry to measure the glass transition temperatures (Tg) of supported thin films of poly(4-hydroxystyrene) (PHS) and hydroxy terminated polystyrene (PS-OH). The films were spuncast from solution onto silicon oxide substrates and annealed under vacuum at elevated temperatures to…
The interplay between side-chain and main-chain conformations is a distinctive characteristic of proline residues. Here we report the results of a statistical analysis of proline conformations using a large protein database. In particular, we found that proline residues with the preceding peptide bond in the cis state…
The first layer SERS effect is usually ascribed to dynamical charge transfer (DCT) between metal and absorbate, following a model by Persson. Experiments show that there is no first layer SERS effect at smooth noble metal surfaces, in spite of the surface resistance caused by adsorbates, which is also caused by DCT ac…
The fluorescence of single-colloidal CdSe quantum dots is investigated at room temperature by means of the autocorrelation function over a time scale of almost 12 orders of magnitude. Over a short time scale, the autocorrelation function shows complete antibunching, indicating single-photon emission and atomiclike beh…
A new, versatile preparation method for porous filmsby spin-coating with a stable suspension of pre-synthesized microscopic zeolite particles (see Figure) is reported by the authors. The scope of the method includes zeolite/substrate combinations inaccessible by direct growth, and preferred orientation of porous mater…
Si 3 N 4 powders with the concurrent addition of Yb 2 O 3 and MgSiN 2 were sintered at 1900°C for 2–48 h under 0.9 MPa nitrogen pressure. Microstructure, lattice oxygen content, and thermal conductivity of the sintered specimens were evaluated and compared with Si 3 N 4 , Yb 2 O 3 , and MgO addition. MgSiN 2 addition…
The crevice corrosion resistance of Alloy 625 (UNS N06625) and Alloy 22 (UNS N06022) was compared based on critical potentials for stabilization and repassivation as well as crevice stabilization rates derived from critical potential data. The effects of temperature and anion composition in 5 M lithium chloride (LiCl)…
The fundamental electromagnetic properties of left-handed materials (LHMs) are reviewed and verified by finite-element method full-wave analysis using rectangular waveguide structures loaded by a LHM and adopting an effective medium approach. The negative phase velocity, positive intrinsic impedance, and modified boun…
The ferric uptake regulator (Fur) protein is known to act as a Fe2+-dependent transcriptional repressor of bacterial promoters. Here, we show that, in Helicobacter pylori, Fur can mediate the regulation of iron-activated genes in contrast to classical Fur regulation, in which iron acts as a co-repressor. Inactivation…
The Eu(III) tetraazamacrocyclic complexes [Eu.1] and [Eu.2], and the Tb(III) and Yb(III) complexes [Tb.1] and [Yb.2], have been synthesized as luminescent molecular-level devices. The Eu complexes exhibit unique dual pH switching behavior in water under ambient conditions. The delayed Eu emission is reversibly switche…