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。
Eine Halogenid-induzierte Ligandenumlagerung an einem RhI-Zentrum eignet sich zur Synthese heterokoordinierter Komplexe vom Pinzettentyp. Mithilfe einer Vielzahl an P,S- und P,O-hemilabilen Liganden lassen sich Umwandlungen zwischen vier verschiedenen RhI-Koordinationsumgebungen erreichen (siehe Schema).
Highly luminescent colloidally prepared HgTe nanocrystals (NCs) are used to fabricate microcavity light-emitting devices operating around 1.5μm. They consist of a Bragg interference mirror from standard optical materials deposited on glass substrates, an active layer embedding the nanocrystals, and a metallic top mirr…
We propose a simple and efficient method to engineer absolute negative refraction for both polarizations of electromagnetic wave in two-dimensional photonic crystal by adding an additional component to the existing photonic crystal. The dielectric property of the additional component, as well as its insertion position…
Purpose The aim of the research is to investigate the influence of ceramic coating on the wear performance of machine parts. Design/methodology/approach Ductile cast iron parts were coated using ceramics. Three ceramics were used for this purpose. These coated parts were subjected to wear tests under a stable load. A…
Abstract A two‐step route to an AB 2 monomer that underwent polymerization via nucleophilic aromatic substitution to afford hyperbranched poly(arylene ether sulfone)s (HB PAES) was developed. The synthesis of 3,5‐difluoro‐4′‐hydroxydiphenyl sulfone ( 4 ) was accomplished by the reaction of 3,5‐difluorophenylmagnesium…
Patterned monolayers of gold nanoparticles are selectively formed on Hf4+-modified silicon dioxide. The 1.5 nm diameter particles are functionalized with a phosphonic acid ligand shell and assembled from solution on a native oxide surface that has been patterned with Hf4+ ions, as shown in the Figure. This system inte…
The development of hybrid organic–inorganic membranes with a low propensity for protein adsorption and highly uniform nanometre size pores is described. Poly(ethylene glycol) (PEG) monolayers were grafted to nanoporous alumina membranes using covalent silane and physical adsorption poly(ethyleneimine) (PEI) immobiliza…
Atomistic simulations are performed to investigate the structural, mechanical and electronic properties of a coaxial C/BN nanocable under axial elongation using molecular dynamics. Our results show that the mechanism of the breaking process essentially differs from those for initial single-walled carbon and BN nanotub…
The crystal structure of antiferroelectric $\mathrm{Pb}\mathrm{Zr}{\mathrm{O}}_{3}$ is reexamined using density functional calculations. These confirm the difference in oxygen positions from early neutron scattering results but are in good agreement with more recent neutron scattering studies. There are small but sign…
The solubility of puerarin in water, ethanol, and acetone solutions was measured over the temperature range of (288.2 to 328.2) K. The solubility of puerarin in water increases with increasing temperature, whereas the solubility of puerarin in ethanol and acetone decreases with increasing temperature. The solubility d…
Highly ordered WO3/TiO2 composite nanotubes have been successfully prepared by the combination of the sol?gel chemical method and the anodic aluminium oxide (AAO) templating method. The diameter of the WO3/TiO2 composite nanotubes is about 100?nm, which is in good agreement with the pore diameter of the AAO template.…
Abstract Montmorillonite clay (N) based nanocomposites were prepared using three different grades of acrylonitrile butadiene rubber (NBR) (19%, 34%, and 50% acrylonitrile contents), styrene butadiene rubber (SBR), and polybutadiene rubber (BR). Rheological study was carried out on these nanocomposites at three differe…
Raman scattering, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to study the mechanism of the catalytic crystallization of carbon and metal dusting corrosion. A mechanism is proposed for both metal dusting and the growth of carbon fibers. Carbon cannot crystallize well…
Homogeneous yttria-stabilized zirconia (YSZ) with 8-31 nm average crystallite and particle diameter containing 3-10 mol% yttria are made by flame spray pyrolysis (FSP) of various yttrium and zirconium precursors at production rates up to 350 g h(-1). Product particles are characterized by N(2) adsorption (BET), transm…
Abstract Summary: The processability, morphology, and resulting mechanical properties of novel polypropylene (PP) samples of varying molecular weight ( $\overline M _{\rm w}$ ) were studied. A series of homopolymer PP in a wide $\overline M _{\rm w}$ range from 101 000 to 1 600 000 g · mol −1 was polymerised in a liqu…
The uptake of platinum and copper tetra-ammine (PTA and CTA, [(NH(3))(4)Pt](2+) and [(NH(3))(4)Cu](2+)) into zeolites was compared over silica and three zeolites (Y, MOR and MFI) with different points of zero charge and aluminium content. Adsorption was determined as a function of pH at several metal concentrations, a…
Abstract A DBSA ( n ‐dodecylbenzene sulfate)‐complexed aniline formaldehyde [AF(DBSA) 1.0 ] was successfully synthesized with excess aniline (compared with formaldehyde) in the presence of n ‐dodecylbenzene sulfonic acid (HDBSA), which was complexed with aniline monomer before polymerization. The resin was carefully c…
The electron field emission from zinc oxide (ZnO) nanoneedles on flexible plastic substrates is reported. ZnO thin films were first deposited on plastic substrates at 200 °C using a filtered cathodic vacuum arc technique; the films were then bombarded by Ar + ion. After ion beam irradiation, high-density ZnO nanoneedl…
A nanometer-sized ethyl alcohol meniscus induced between a conductive atomic force microscope tip and a silicon surface (see Figure) allows the fabrication of nanodots or nanowires of SiCx at a predetermined position on the substrate. The meniscus size and kinetic parameters control the nanostructure size.
A method for fabricating integrated carbon pipes (nanopipettes) of sub-micron diameters and tens of microns in length is demonstrated. The carbon pipes are formed from a template consisting of the tip of a pulled alumino-silicate glass capillary coated with carbon deposited from a vapour phase. This method renders car…