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。
Double-gate carbon nanotube field effect transistors (DG-CNTFETs) are novel devices showing an interesting property that consists of controlling the p- or n-type behavior during the device operation. This opens up the opportunity for novel design paradigms. Based on a compact physical model of these devices, we demons…
Ca(Fe${}_{1\ensuremath{-}x}$Co${}_{x}$)${}_{2}$As${}_{2}$ single crystals with a concentration $x=0.032$, 0.039, 0.051, 0.056, and 0.063 were prepared and investigated by means of magnetic susceptibility and neutron diffraction combined with $\mathit{in} \mathit{situ}$ electrical resistivity. The $x$-$T$ phase diagram…
To investigate the behavior of the As 4 S 4 molecule within a crystal-chemical environment differing from realgar, α-As 4 S 4 , and its high-temperature polymorph, β-As 4 S 4 , the effects of the light exposure on the structure of the HgI 2 ·As 4 S 4 adduct have been studied. The structure of this compound consists of…
The effect of hydrostatic pressure on piezoelectric materials is a crucial factor for underwater device design. In this work, the dielectric, elastic, and piezoelectric properties of Pb(Mg 1/3 Nb 2/3 )O 3 –0.33PbTiO 3 [PMNT (67/33)] ceramics were investigated under pressure from 0.1 to 455 MPa. The dielectric permitti…
From fundamental considerations of the surface chemistry of Si etching in fluoride solutions as well as pore formation and propagation, we develop a mechanistic understanding of what must be known for rational development of etchants: (1) an acidic fluoride solution because the presence of OH- promotes step flow etchi…
Spark plasma sintering is a powerful method to produce fine grain dense ferrite at low temperature. However the process, usually conducted in neutral atmosphere in a carbon die, yields carbon surface deposition and the reduction of Fe3+ into Fe2+. It is shown that subsequent annealing in air can remove carbon and unde…
Nanostructured carbon films with oriented graphitic planes can be deposited by applying energetic carbon bombardment. The present work shows the possibility of structuring graphitic planes perpendicular to the substrate in following two distinct ways: (i) applying sufficiently large carbon energies for deposition at r…
Abstract The effect of alloying on the adsorption of atomic hydrogen was studied using density functional theory (DFT). In the study the (100) surfaces of Pd-Ag, Pd-Pt, Pd-Au, Pt-Ag, and Pt-Au alloys were considered by means of a cluster model. The structural and energetic properties of the H atom adsorbed on the Pd4M…
Growing X-ray grade crystals of a specific protein is a process of trial and error. Usually, hundreds or even thousands of conditions are screened in order to identify useful crystallization conditions. Heterogeneous nucleants have been shown to increase the success rate of crystallization trials, and (human) hair has…
A library of novel, lipid-modified derivatives of ascorbic acid was shown to exhibit highly attractive properties as surfactants, emulsifiers, oil soluble antioxidants, and highly effective gelators in organic solvents and especially water. In these systems, intermolecular hydrogen bonding and van der Waals forces act…
Abstract A novel toughening modifier, styrene–isoprene–butadiene rubber (SIBR), was used to improve the impact resistance and toughness of acrylonitrile–butadiene–styrene (ABS) resin via bulk polymerization. For comparison, two kinds of ABS samples were prepared: ABS‐1 was toughened by a conventional modifier (a low‐c…
The understanding of the anisotropic magnetization mechanism in 3%Si steel is relevant to both the design of the electrotechnical applications of 3%Si steel and the fundamental materials science of soft magnetic materials. In the present study, the relation between the anisotropic magnetic properties and the magnetiza…
Batch cultivation of monoculture of Lactobacillus sp. and two-strain mixed culture of Lactobacillus sp. and Lactobacillus amylovorus DSM 20531 T was carried out with the aim of producing L-(+)-and D-(-)/L-(+)-lactic acid to be implemented in poly(lactic acid) polymer production.Metabolic capacity of two Lactobacillus…
Laser spectroscopic measurements showed that ground-state atomic nitrogen and vibrationally excited molecular nitrogen were produced by the contact of N 2 with heated tungsten surfaces. The apparent activation energy for the production of N atoms was almost half of the N≡N bond dissociation energy. N-atom density incr…
Template synthesis of porous carbon materials usually requires selective removal of template silica from the carbon/silica composites. It not only involves waste of valuable chemicals, but also poses significant environmental concerns including high waste treatment cost. Recycling of silicates released from such nanoc…
Ein eingesperrter Katalysator: Aus Edelmetall- und Oxidnanopartikeln können hochtemperaturstabile mesoporöse Nanokolloidkugeln (MMNCSs, siehe Bild) erhalten werden. Die katalytische Aktivität, Selektivität und Thermostabilität der MMNCSs wurde in der Oxidation von Kohlenmonoxid und der Umsetzung von Cyclohexen mit Was…
Due to the inherent viscosity of polymer, piezoelectric response in the thickness direction (d33) of cellular ferroelectret films usually depends on the time of measurement. In this letter, the micromechanical theory of viscoelastic composite was extended to predict the time dependence of the overall piezoelectric d33…
Optical properties of ZnCdO/ZnO single quantum well (SQW) grown on c-sapphire substrate by pulsed laser deposition were investigated. Temperature dependent photoluminescence (PL) measurement was performed from 10 to 300 K to study the carrier localization effect and peak evolution. The LO-phonon replicas up to third o…
In this work, thin film copper vanadium oxide electrodes including Cu3V2O8 and Cu5V2O10 were prepared by an aqueous process for thermal batteries. The electrochemical performances of thin film electrodes were tested and evaluated in thermal cells. Comparing with pressed pellet electrodes, the thin film electrodes were…
In this letter, it is shown that when replacing Ge by Fe in Tb5Si2Ge2 the structural transition still occurs and enhances the magnetocaloric effect (MCE) (up to 66%) with maximum of MCE at a critical Fe amount where the magnetic and structural transitions become fully coupled. It is observed that Fe concentration is a…