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。
The scaling behavior of the Portevin-Le Chatelier (PLC) effect is studied by deforming a substitutional alloy, Al-2.5%Mg and an interstitial alloy, low carbon steel (0.15%C, 0.33%Mn, 0.04%P, 0.05%S, 0.15%Si and rest Iron) at room temperature for a wide range of strain rates. To reveal the exact scaling nature, the tim…
While a perfect hcp (0001) surface has three-fold symmetry, the diffraction patterns commonly obtained are six-fold symmetric. This apparent change in symmetry occurs because on a stepped surface, the atomic layers on adjacent terraces are rotated by 180 degrees. Here we use a Low-Energy Electron Microscope to acquire…
Purification and size-based separation of nanoparticles remain significant challenges in the preparation of well-defined materials for fundamental studies and applications. Diafiltration shows considerable potential for the efficient and convenient purification and size separation of water-soluble nanoparticles, allow…
Sr x Ba 1- x Nb 2 O 6 (SBN) ceramics were synthesized from Sr 0.45 Ba 0.55 Nb 2 O 6 (45SBN) to 75SBN according to x content, and the mineral phases of ceramics were identified by XRD. Some SBN single crystals were grown by Czochralski method. There was only one single phase in from 45SBN to 70SBN when synthesizing at…
Carbon-doped silicon oxide (SiCOH) low-k films were deposited with plasma enhanced chemical vapor deposition (PECVD) using divinyldimethylsilane (DVDMS) with two vinyl groups and tetravinylsilane (TVS) with four vinyl groups compared with vinyltrimethylsilane (VTMS) with one vinyl group. With more vinyl groups in the…
The functionalization of bentonite by intercalation of surfactants dodecylamine, hexadecylamine, octadecylamine, and the octadecyltrimethylammonium cation is described. Products are characterized by elemental analysis, thermal analysis, FT–IR spectra, and powder X-ray diffraction analysis. Laminar amine-clay nanocompo…
4′-Methyl-biphenyl-4-carbonitrile and the 4′-Methoxy-biphenyl-4-carbonitrile homologous series are known to exhibit calamitic (nematic and/or smectic) liquid crystal phases. In this work, aspect ratios x (length/diameter) for these molecules are computed from electronic structure calculations using ab initio HF/3-21G/…
The aim of this work has been to develop new composites using filler and resins obtained from renewable resources, combining low cost and good mechanical properties. The raw materials selected for the polymeric matrix were tannin extracts and plant oils. The tannin extracts are potential substitutes for phenol-formald…
Abstract Thermally and chemically durable hydrophobic oleophobic coatings, containing different ceramic particles such as SiO 2 , SiC, Al 2 O 3 , which can be alternative instead of Teflon, have been developed and applied on the aluminum substrates by spin‐coating method. Polyimides, which are high‐thermal resistant h…
Abstract Scattering of a TM plane wave from a finite periodic surface is studied by the spectral formalism. First, the diffraction beam, the optical theorem, the total scattering cross section and the relative power of diffraction beam are defined. By use of the principle of reflection, it is shown that the spectrum o…
Abstract Sulfonic acid esters of differently linked polysaccharides including cellulose, dextran, lichenan, and pullulan were synthesized homogeneously applying N,N ‐dimethylacetamide/LiCl as the solvent. The dependence of the degree of substitution (DS) on the molar ratio of repeating unit to sulfonic acid chloride a…
Polymer self-consistent field theory of the Edwards-Helfand kind is the state-of-the-art method for predicting the morphologies of block copolymer materials. The methodology of block copolymer self-consistent field theory is transported to classical density functional theory such that a wide range of self-consistent f…
Hollow cadmium selenide (CdSe) tetrapods were synthesized on a large scale. The directional growth of twins led the tetrapod nanostructure to be formed. The silicon powder was responsible for the growth of the hollow tetrapods. The UV-visible absorption spectra of the hollow CdSe tetrapods display an absorption edge a…
This article presents a method of characterizing the macromechanical properties of polymer nanofibrous scaffolds based on the nanomechanical properties obtained for a single nanofiber. Here, we use the example of a poly(L-lactic acid) (PLLA) nanofibrous scaffold that can be used for tissue engineering application. The…
Abstract The blend miscibility of poly(vinyl alcohol) and poly(methyl methacrylate) in N,N ′‐dimethylformamide solution was investigated by viscosity, density, ultrasonic velocity, refractive index, and UV and fluorescence spectra studies. Differential scanning calorimetry and scanning electron microscopy were used to…
Abstract A combination of microscopy studies (SEM, ESEM/EDX, and TEM/EDX) is proven to be useful in locating chalk particles and silicone elastomer in a flame retardant system based on ethylene–acrylate copolymer, chalk, and silicone elastomer. The dispersion of the two additives was also obtained. The chalk particles…
Abstract The crystallization behaviors of poly( p ‐dioxanone) (PPDO) with different molecular weights (MWs) have been studied using a differential scanning calorimetry. The results showed that the MW of PPDO affects the crystallization rate and crystallinity obviously during the dynamic crystallization process. The Av…
We present dc magnetization experiments performed on the doped, polycrystalline system ${\mathrm{La}}_{0.67\ensuremath{-}x}{A}_{x}{\mathrm{Ca}}_{0.33}\mathrm{Mn}{\mathrm{O}}_{3}$ $(A=\mathrm{Ce},\mathrm{Y})$. The ceramic samples have been obtained by the nitrate decomposition route and structurally characterized by po…
The Bi1.5ZnNb1.5O7 (BZN) thin films with cubic pyrochlore structure were prepared on Pt∕SiO2∕Si substrates by pulsed laser deposition from a stoichiometric target. The crystallinity, surface morphology, and dielectric properties of BZN thin films at different substrate temperatures were investigated. It was found that…
We study the structure and magnetism of the ferromagnetic half metallic Heusler compound Co 2 MnGe in high-quality [Co 2 MnGe/Au] n - and [Co 2 MnGe/V] n -multilayers by hard x-ray scattering and soft x-ray resonant magnetic scattering. The diffuse hard x-ray scattering reveals that in [Co 2 MnGe/Au] n at the interfac…