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。
We study the evolution of the spectral function with progressive hole doping in a Mott insulator, ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{VO}}_{3}$ with $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.0--0.5$. The spectral features indicate a bulk-to-surface metal-insulator transition in this…
Corrosion protection of metallic substrates has long been one of the key roles performed by organic coatings. Such coatings remain one of the most cost-effective means of providing practical protection from corrosion to easily corrodible metallic (and sometimes non-metallic) structures and objects. This choice of a co…
A novel mechanism for dephasing in dielectric glasses is considered. The mechanism is due to the delocalized collective excitations arising in the ensemble of the interacting two-level systems. The spectral diffusion induced by these excitations gives rise to the phonon-independent transverse relaxation. The mechanism…
Corrosion protection of metallic substrates has long been one of the key roles performed by organic coatings. Such coatings remain one of the most cost-effective means of providing practical protection from corrosion to easily corrodible metallic (and sometimes non-metallic) structures and objects. This choice of a co…
The low-field magnetoresistance of films deposited on different substrates has been measured. Whereas post-annealed films on and exhibit a clear anisotropic magnetoresistance (AMR), the low-field magnetoresistance of as-deposited films on and Si is dominated by grain-boundary magnetoresistance. At low temperatures the…
The precise C content of a series of Si1−yCy epilayer samples (0<y<0.012) was determined by resonant backscattering experiments using a He+4 ion beam at 5.72 MeV. This beam energy is more suitable for the determination of the C content than the previously used 4.265 MeV. From the correlation of these inv…
The dielectric tunability, which is defined as the percentage change of the permittivity under DC biasing, is over 30% for polycrystalline barium strontium titanate (BST) under a field of at around the Curie peak. Various volume fractions (18%, 40%, 52%, and 64%) of BST powder are mixed with silicone rubber to obtain…
Characteristics of Aircraft Structures and Materials. Introduction to Elasticity. Torsion. Bending and Flexural Shear. Flexural Shear Flow in Thin--Walled Sections. Failure Criteria for Isotropic Materials. Elastic Buckling. Analysis of Composite Laminates. Index.
Bulk samples of , with x = 0, 0.3, 0.5, with layered perovskite structure have been synthesized and investigated as regards their electrical, electronic and magnetic properties. It is found that has tetragonal structure and is a metallic ferromagnet with a magnetic transition temperature of 170 K. This compound shows…
The chemical reactions occurring during the intumescent process taking place in the combustion of the poly(2,6-dimethyl–1,4-phenylene ether)–high-impact polystyrene blends (PPE–HIPS) are studied in detail through the chemical characterization of the burnt and original material by infrared, pyrolysis–gas chromatography…
The thermal degradation and thermooxidative degradation of epoxidized natural rubber (ENR) were studied by thermogravimetry (TG). In the thermal degradation of ENR, the initial temperature of weight loss T0 = 1.20B + 348, the temperature of maximum weight loss rate Tp = 1.07B + 392, and the final temperature of weight…
Photophysical properties of zinc-tetraphenylporphyrin (ZnTPP) were studied in n -heptane/AOT/ethylene glycol and isooctane/AOT/ethylene glycol microemulsions. Results of steady state and transient fluorescence techniques show the existence of different spectroscopic ZnTPP species located at different environments of t…
An attempt was made to prepare ultrafine titanium dioxide (TiO 2 ) particles in the nanometer range by making use of the hydrolysis and condensation reactions of tetraisopropylorthotitanate (TTIP) in the inner aqueous phase of Aerosol OT reversed micelles formed in cyclohexane. Addition of linear alcohols (C 2 to C 6…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolymerizable Lyotropic Liquid Crystals Containing Transition-Metal and Lanthanide Ions: Architectural Control and Introduction of New Properties into Nanostructured PolymersHai Deng, Douglas L. Gin, and Ryan C. SmithView Author Information Department of Chemistry, Uni…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA New Synthesis of Tetrathiooxalate and Its Conversion to C3S52- and C4S62-Jonathan G. Breitzer, Jun-Hong Chou, and Thomas B. RauchfussView Author Information School of Chemical Sciences and the Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Cha…
Flexible PVC pellets were treated at 150–250°C in 0–7M NaOH solutions for 0–12 h. The degree of dehydrochlorination of flexible PVC pellets increased with increasing reaction temperature and was about 100% at 250°C over 5 h. A porous char, 2–16 μm in pore size, was produced. The dehydrochlorination of PVC in the flexi…
Novel well-defined oligomers consisting of two dopable π-conjugated segments, 2,2‘-bipyrrole or 2,2‘-bithiophene, linked via 1,3-phenylene and end-capped with phenyl groups have been synthesized using palladium-catalyzed cross-coupling reactions. The molecules are considered as prototypical examples for polaronic ferr…
The polymer poly(vinylidene fluoride) (PVDF) was irradiated with X-rays produced by a nonmonochromatic (MgKα) source and the structural and electronic PVDF surface modifications were studied by X-ray photoelectron spectroscopy (XPS). Changes in the shape and intensity of the C1s and F1s lines show that a PVDF degradat…
(2,3,9,10,16,17,23,24-Octahydroxyphthalocyaninato)nickel(II) (NiPc(OH) 8 ) has been prepared by demethylation of (octamethoxyphthalocyaninato)nickel(II). Silylation of peripheral oxygen atoms using dimethyl- tert -butylsilyl chloride gave NiPc(OSi( t -Bu)Me 2 ) 8 as a convenient precursor to NiPc(OH) 8 with high solub…
In a normal Fermi liquid, Landau's theory precludes the loss of single-fermion quantum coherence in the low-energy, low-temperature limit. For highly anisotropic, strongly correlated metals, there is no proof that this remains the case, and quantum coherence for transport in some directions may be lost intrinsically.…