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。
Abstract New steroidal glycosides, stalagmosides I–V ( 1 – 5 ) and indicosides I and II ( 7 and 8 ), together with the known compounds carumbelloside III, lasianthoside A, and lasianthoside B, were isolated from whole plants of Caralluma stalagmifera and Caralluma indica , respectively. Their structures were elucidate…
The hydrothermal oxidation behavior of silicon nitride was studied as a function of vapor velocity in the range of 1–35 cm/s, at atmospheric pressure and ∼100% H 2 O, using a custom‐designed hydrothermal apparatus. At lower velocities, silicon nitride showed a marginal weight gain during early exposure times followed…
The results of direct measurements of the magnetic field induced entropy change in the Ni _{2.19} Mn _{0.81} Ga alloy are presented. It is shown that the largest entropy change in the magnetic field 2.6 T is equal to 11 J/kgK. The experimental data are compared with the theoretical results, obtained with the help of t…
This study focuses on the phase transformation induced during mixing fixed quantities of MoO 3 and Al 2 O 3 or aluminum powder (2, 3, 4, 5, 10, 20, 40, 50%). Different solid solutions were identified by x-ray powder diffraction, FTIR, and DTA. In the Al 2 O 3 concentration range 2–20%, the only phase present besides M…
Abstract The rheology and morphology of highly compatibilized droplets has been studied, using both rheology and small angle light scattering. It is shown that linear viscoelastic measurements are a powerful tool to investigate the effectiveness of a compatibilizer to suppress coalescence. Moreover, such highly compat…
We present the results of the investigation of the ZrO 2 -FeO system under an inert atmosphere. We have refined the position of the eutectic point, which lies at 1332 ± 5°C and 10.3 ± 0.6 mol % ZrO 2 . The iron oxide solubility boundaries in zirconium dioxide have been determined over a wide temperature range taking i…
Abstract Photopolymerization of liquid crystalline monomers was achieved within photoaligned mesoporous silica film. After resolving the template of silica networks, bundles of nanofibers containing polymer chains with a narrow molecular weight distribution were obtained.
Using first principles calculations with ultrasoft pseudopotentials, we study the thick dependence of the atomic and electronic structures of (110) slabs of $\mathrm{Ti}{\mathrm{O}}_{2}$ rutile having one to five layers. Thin slabs with an even and odd number of layers show significantly different structural character…
Abstract Melt spinning of poly‐L, DL‐lactide 70/30 has been studied. Fiber having diameter lower than 120 micron exhibited tensile modulus and strength in the range of 3–4 GPa and 130–180 MPa, respectively. Maximum attainable modulus and strength of 4.7 GPa and 205 MPa were predicted, according to a proposed equation…
Abstract A new pyran ( 1 ) is synthesized. When molecularly dissolved in acetone, 1 is practically nonemissive. Addition of water induces it to cluster into nanoaggregates, which turns its emission “on” and boosts its luminescence efficiency dramatically. The color of its emission changes from green to red upon aggreg…
The formation of micropores at the start of the oxidation of carbon spheres was studied by N 2 gas adsorption, small-angle X-ray scattering and transmission electron microscopy with the aid of image processing. On the basis of a detailed analysis of the measurement results, it was suggested that the principal process…
Ba 0.25 Sr 0.75 Ti O 3 ∕ Sr Ru O 3 (BSTO/SRO) thin-film varactors were fabricated on (001)LaAlO3 substrates and characterized at rf and microwave frequencies of up to 10 GHz in the temperature range of 50–300 K. X-ray analysis reveals epitaxial growth of (001)-oriented BSTO films with extended out-of-plane lattice par…
Soft-chemical routes play an important role in preparation of nano-materials. In particular, the combustion synthesis has emerged as a promising solution-chemistry route for synthesizing a variety of oxide ceramics in the nano-crystalline form. In this review article, the potential of this technique for preparation of…
Abstract An overview is given for the experimental and theoretical development on fluorescence intermittency (blinking) in semiconductor crystalline nanoparticles. We consider a model with photoinduced spectral diffusion and diffusion‐controlled electron transfer processes as the underlying mechanism for intermittency…
Purpose Lack of good post‐harvest storage of cocoa pods has been responsible for the low commercial quality of cocoa beans. This study aims to evaluate the effect of modified packaging and storage time of cocoa pods on the corresponding commercial qualities of cocoa beans. Design/methodology/approach Preweighed cocoa…
In order to design high-quality threads, it is necessary to know the properties of threads and fibers, as well as the loadings and deformations which may occur during the sewing process. Thread properties depend on the mechanical properties of the fiber and the constructional parameters of the thread and its surface t…
Dynamic heterogeneity in miscible blends was investigated by the use of dielectric relaxation spectroscopy for blends composed of poly(vinylethylene) (PVE) and various polyethers, i.e., poly(butylene oxide) (PBO), poly(isopropyl glycidyl ether) (PiPGE), poly( n -butyl glycidyl ether) (PnBGE), and poly( tert -butyl gly…
Nitrogenated amorphous carbon (a-CNx) films were prepared by unbalanced magnetron sputtering (UBMS) at different N2∕Ar gas flow rate ratios and different bias voltages. The films were characterized using x-ray photoelectron spectroscopy, Raman scattering, nanoindenter, atomic force microscopy nanoscratch, and contact…
A room-temperature sol-gel-based process was used to produce by direct synthesis talc-like organosilicates having hexadecyl or aminopropyl groups pending in the interlayer space. Thermal analyses, Fourier transform infrared and 13C/29Si solid-state nuclear magnetic resonance spectroscopies confirmed the presence of or…
The FP project is an international reactor safety project. Its main objective is to study the release, transport and retention of fission products in a severe accident of a light water reactor (LWR). The FPT4 test was performed with a fuel debris bed geometry, to look at late phase core degradation and the releases of…