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 technique based on the time-of-flight (TOF) concept was proposed for determination of ion mobility in epoxy resins under isothermal curing conditions. This study extends our earlier investigations on this subject. Ionic conductivity dc measurements also were carried out in order to gain better understanding of the…
Microstructural evolution during sintering of alumina powder compacts prepared by cold isostatic pressing (CIP) was monitored. For CIP, rubber molds lubricated with silicone oil were used so that a very small amount of impurity was introduced to the surface of the powder compacts. During sintering at 1600°C, grain gro…
A chemical kinetics study of the functional groups −OC 2 H 5, SH -, and S 2- was carried out for the sol−gel processing of GeS 2 from hydrogen sulfide and germanium ethoxide in toluene. A mass balance of the reaction components was monitored by potentiometric titrations of SH - and S 2- with the Ag/Ag 2 S ion-selectiv…
Equal-channel angular pressing (ECAP) has been used to refine the grain size of commercially pure (CP) titanium as well as other metals and alloys. CP-Ti is usually processed at about 400 degrees C because it lacks sufficient ductility at lower temperature. The warm processing temperature limits the ability of the ECA…
Abstract With the intention of examining how adsorption on a SERS‐active surface affects the electronic resonance enhancement in surface‐enhanced resonance Raman scattering (SERRS) from Ni(II) porphine (NiP), we acquired high‐quality SERR spectra from very low concentrations of NiP (∼10 −8 M ) in aqueous Ag sol from 5…
The catalytic activity of various compounds in the first stage of the melt transesterification of diphenyl carbonate and Bisphenol A (at 165°C) has been evaluated in order to identify new catalysts which may be of interest for the melt-phase preparation of Bisphenol A polycarbonate. Alkaline-earth and alkaline metals…
Comprehensive thermogalvanomagnetic measurements have been made on polycrystalline samples of Bi88Sb12. The temperature has ranged from 100 to 300 K and a magnetic field of up to 1 T has been used. The samples have contained up to 1000 ppm of either tin or selenium. We have attempted to calculate the electronic compon…
This work consists of two sequential parts, which review the advances in uncovering the capacity of VLEED, STM and PES in revealing the nature and kinetics of oxidation bonding and its consequences for the behavior of atoms and valence electrons at a surface; and in quantifying the O–Cu(001) bonding kinetics. The firs…
Cu/SiO2, Zn/SiO2 and Cu-Zn/SiO2 samples have been prepared by the homogeneous deposition-precipitation method. The samples were analyzed by thermal analysis, X-ray diffraction and infrared spectroscopy after various heat treatments and compared with data obtained for several minerals. It has been shown that interactio…
Anionic poly(caprolactam-co-laurolactam) has been isothermally synthesized at 155°C by hexamethylene dicarbamoylcaprolactam as fast activation agent and two Na lactamates (from the mixed monomers or neat caprolactam, respectively) as initiators. The specific roles of both the chosen initiator and the laurolactam conte…
The arrangement as well as the properties and the structure of the fibres within the yarn and the yarns within the fabric generate a complex mechanism of deformation in such material. Therefore, intends to develop a theoretical model of the mechanical behaviour of the twill weave based on previous researches concernin…
Die Selenidostannathydrate [(C2H5)3NH]2Sn3Se7 · 0,25 H2O (I) und [(C3H7)2NH2]4Sn4Se10 · 4 H2O (II) wurden in einer wässrigen Suspension von Triethylammonium (Tripropylammonium), Zinn und Selen I, und zusätzlich Schwefel II bei 130 °C hergestellt. I kristallisiert bei Zimmertemperatur in der monoklinen Raumgruppe P21/n…
The fracture toughness of unglazed, commercial samples of bone china and hard porcelain produced by powder pressing spray dried granulated bodies has been determined using the Vickers indentation method. Young's modulus, hardness, and brittleness have also been measured. Although the bone china, with 10% porosity, was…
GrdE and PrdA of Clostridium sticklandii are subunits of glycine reductase and D-proline reductase, respectively, that are processed post-translationally to form a catalytic active pyruvoyl group. The cleavage occurred on the N-terminal side of a cysteine residue, which is thus the precursor of a pyruvoyl moiety. Both…
Glasses in the system lithium chloride-lithium borate-tellurium dioxide have been prepared by the melt quenching route and characterised for their densities, glass transition temperatures and heat capacities. Their structures have been investigated using infrared, Raman and magic angle spinning nuclear magnetic resona…
In this work, two kinds of new cardo dicarboxylic acids containing a diphenylmethylene linkage and a pendant norbornyl group were prepared from p-fluorobenzonitrile and bis(4-hydroxphenyl)diphenylmethane and 2,2-bis(4-hydroxyphenyl)norbornane, respectively, via aromatic nucleophilic substitution reaction followed by h…
Imperfect oriented attachment of nanoparticles over specific surfaces is rationalized to cause accretion and defects for the hexagonal inorganic-surfactant mesophase. Analytical electron microscopy indicates that silicate MCM-41 particles, prepared in alkaline hydrothermal condition and then surfactant (cetyltrimethyl…
In this work the thermal behaviour of crosslinked low density polyethylene (XLPE) used as an insulator for commercial underground high tension (15 kV) cables was studied. Three types of materials were selected: an uncrosslinked low density polyethylene (NXLPE) used as a control sample, an XLPE and an aged XLPE sample.…
The phase separation behaviour of block copolymers of the type (A–B) n (segmented block copolymers, multiblock copolymers) containing segments with different degrees of flexibility was investigated using a stepwise variation of the incorporated blocks A and B. Amorphous/rigid blocks (polysulfone segments) were systema…
The thickness dependence of electrical transport and magnetization of ultrathin La0.7Sr0.3MnO3 films has been investigated using epitaxial La0.7Sr0.3MnO3(LSMO)/SrTiO3 multilayers prepared by pulsed laser deposition. Layer thicknesses range from 1.9 to 10 nm for both constituents. Microstructural characterization by x-…