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 surface oxides formed during water atomisation and sintering of austenitic stainless steel were determined using electron spectroscopy for chemical analysis (ESCA) and Auger electron spectroscopy (AES). Optical microscopy and electron microscopy (SEM and TEM) were used for structural analysis of powder and sintere…
The sol–gel process opens the possibility of producing vitreous solids containing the main structural groups of oxide glasses and polymers by introducing compounds of the type RnSi(OR′)4–n into the starting mixture. The Si–C bond is normally stable towards hydrolysis and therefore the ligand R acts as a network modifi…
Ultrafine NiII-bearing ferrites (UNFs) with 14–100% Ni2+-substitution (x in NixFe3 –xO4) for Fe2+ in magnetite have been synthesized by hydrolysis of Ni2+, Fe2+ and Fe3+ ions at 60 °C, followed by aging of the co-precipitates at 60 °C and heating to 300 °C. The aged co-precipitates (ACPs) obtained at an NiII/Fetotal m…
Molecular dynamics simulation studies of the smectic B phase of the Gay–Berne model mesogen at constant volume suggest that the structure of the phase may be influenced by the periodic images. To avoid this problem we have undertaken an isothermal–isobaric Monte Carlo simulation of this phase. The ability of the dimen…
A new approach is proposed for analysis of scattering by a periodically corrugated dielectric layer with non-identical faces. The method combines the simultaneous use of several different coordinate systems and the generalized S-matrix formalism. The program has been tested by comparisons with results given by the int…
The sinterability and thermal conductivity of Y2O3 doped AlN powders with diverse specific surface areas (42-2.9m2g-1) and oxygen contents (0.2-2mass%) were evaluated. It was found that sintering of fine powders induces the densification at lower processing temperatures, and for raw AlN powders with specific surface a…
The changes in fibre structure caused by the realignment of the microfibrils of fibre and yarn samples treated with swelling agents, such as NaOH, LiOH, ZnCl2, and butyltrimethyl ammonium hydroxide (BTMAH), both under tension and slack, were studied by light and electron microscopy. The structural effects of treatment…
Calix[n]aryl esters 2n(n= 4 and 6) bearing two stable N–O·radicals on the lower rim are synthesized: in 26 the exchange interaction (El) changes in response to a metal-induced 1,2,3-alternate-to-cone conformational change but in 24 the metal-induced rotation of the carbonyl groups is not enough to change the El.
Abstract In basic solutions, the oxidised porphyrin 2 readily undergoes macrocyclic N ‐alkylation, with up to four bulky alkyl groups, including decyl and substituted benzyl moieties, being accomodated: an argument is presented to show that N ‐di‐alkylation occurs on opposite nitrogen atoms, on the same side of the ma…
Substitution of a NO + C3H8+ He flow by O2+ He at 623 K leads to the appearance on a H–Cu–ZSM-5 catalyst of three IR bands at 3366, 3290 and 3192 cm–1 assigned to NH3 species as confirmed by NH3 adsorption showing that ammonia is formed during the SCR of NO by propane in excess oxygen, suggesting that it could play th…
Mixtures of SiC powder with diamond seeds were subjected to hydrothermal treatment at 700–750 °C under pressures of 100–500 MPa. The results of this study demonstrate that well crystallised diamond is formed after hydrothermal treatment of SiC when diamond seeds are present.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Gramespacher, J. Meissner; Reversal of recovery direction during creep recovery of polymer ble…
The synthesis of solid-state materials generally requires high temperatures and long reaction times in order to overcome diffusion barriers and achieve homogeneous products. Recently chemical routes using reactive precursors have allowed for greater control over product characteristics including stoichiometry and crys…
The deterioration of the mechanical properties of composite resins was examined. The bending strength and the stress relaxation rate for sixteen experimental composite resins with different filler shapes, particle sizes and filler contents immersed in distilled water for 0-60 days were measured. The bending strength o…
This paper describes the image analysis techniques used for measuring structural characteristics of fiber or fiber bundle segments in a thin nonwoven fabric. The mea surable characteristics include length, thickness, curl, and orientation of fiber segments. A new skeletonization algorithm for extracting the simplified…
Cubic Boron Nitride (c-BN) single-crystals have been synthesized under high pressure and high temperature conditions (HP - HT) using hexagonal Boron Nitride (h-BN) precursors. We have performed a study of both phases with electron (EELS) and X-ray (XAS) spectroscopy that are compared. The c-BN ELNES spectra at B-K and…
The adsorption and reaction of formic acid (HCO2H) on the NiO(111)/Mo(110) and MgO(111)/Mo(110) surfaces have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). The adsorption of formic acid on the NiO(111) surface is dissociative even at 100 K, i…
COF groups are formed by electron irradiation of PTFE [poly(tetrafluoroethylene)] powders in air, especially at the surface and in near-surface regions which can be easily hydrolysed to carboxyl groups by air humidity. The application of special additives during irradiation leads to modified micropowders. Fourier tran…
The development of a user-friendly, interactive personal computer package for designing insulators to be used in polluted conditions is presented. This is accomplished by integrating a dynamic arc model that computes the pollution flashover voltage within the Microsoft Windows application program. Suspension, station…
Glucose is released from the diboronic acid ‘clef’3 when a metal ‘sandwich’ is formed by two 15-crown-5 rings; the binding events are sensitively monitored by changes in the fluorescence intensity.