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。
Photoluminescence (PL) properties of amorphous Si/Ge alloy oxide nanoparticles produced from Ge-doped silicon nanocrystals are studied at room temperature using the 266 nm (4.66 eV) laser line of a pulsed Nd:YAG laser as excitation source. Several radiative point defect centers contributing to the multiple PL are reve…
In most eubacteria, fungi, apicomplexa, plants and some metazoans, the active form of vitamin B6, PLP (pyridoxal 5-phosphate), is de novo synthesized from three substrates, R5P (ribose 5-phosphate), DHAP (dihydroxyacetone phosphate) and ammonia hydrolysed from glutamine by a complexed glutaminase. Of the three active…
The possibility of forming self-organized films using charge-stabilized dispersions of cellulose I nanofibrils and microgel beads of poly-(N-isopropylacrylamide-co-acrylic acid) copolymer is presented. The build-up behavior and the properties of the layer-by-layer (LbL)-constructed films were studied using quartz crys…
In this article, we report non-Arrhenius behavior in the temperature-dependent dc conductivity of alkali ion conducting silicate glasses well below their glass transition temperature. In contrast to the several fast ion-conducting and binary potassium silicate glasses, these glasses show a positive deviation in the Ar…
Near infrared (NIR) CdHgTe/CdS quantum dots (QDs) were successfully prepared by a green synthetic route. The characteristics such as morphology, size, spectra, stability and toxicity were investigated in detail. The fluorescence wavelength of CdHgTe/CdS QDs could be adjusted to the NIR range (812nm), which made the in…
We report the three-dimensional mapping of 150 nm gold metallic nanoparticles dispersed in a homogeneous transparent polyacrylamide matrix using second-harmonic generation. We demonstrate that the position of single nanoparticles can be well defined using only one incident fundamental beam and the harmonic photon dete…
To probe photoinduced water oxidation catalyzed by the Mn₄O₄L₆ cubane clusters, we have computationally studied the mechanism and controlling factors of the O₂ formation from the [Mn₄O₄L₆] catalyst, 6. It was demonstrated that dissociation of an L = H₂PO₂⁻ ligand from 6 facilitates the direct O-O bond formation that p…
Hollow microspheres constructed by single-crystalline hexagonal boron nitride (h-BN) nanoplates have been synthesized via a facile chemical vapour reaction route employing ammonia borane as a starting material. The as-synthesized products are extensively characterized by field emission scanning electron microscopy (FE…
Abstract Highly open porous crosslinked styrene/ acrylonitrile (SAN) polymerized high internal phase emulsion (PolyHIPE) foams containing various amounts of acrylonitrile (AN) were prepared by the polymerization of the continuous organic phase of high internal phase emulsions with an 85 vol % aqueous internal phase. T…
Monte Carlo simulations and finite-size scaling analysis have been carried out to study the critical behavior in a two-dimensional system of particles with two bonding sites that, by decreasing temperature or increasing density, polymerize reversibly into chains with discrete orientational degrees of freedom and, at t…
Temporal Analysis of Products (TAP) reactor system was used to investigate CO oxidation behavior on Au/SiO 2 catalysts prepared via the physical vapor deposition method of magnetron sputtering. Au/SiO 2 catalysts are a valuable model system for studying the reactivity of Au nanoparticles, as the SiO 2 support plays li…
Reife Früchte: Die Fluoreszenz eines konjugierten Polymers wird durch die Gegenwart von Kupfer(I) gelöscht. Bei Einwirkung von Ethylen-Gas binden die Kupfer-Komplexe an Ethylen und die Fluoreszenzlöschung wird aufgehoben (siehe Bild). Dieses Sensorkonzept ist sowohl in Lösung als auch in Polymerfilmen anwendbar.
A 59-year-old man treated with 5-fluorouracil and cisplatin for advanced oesophageal cancer presented abnormal behaviour and subsequently developed impairment of cognitive function, dysphagia and dysarthria on the fifth day of the treatment. Although brain computed tomography revealed no abnormal findings, brain magne…
Through low-temperature electrical transport and magnetotransport, we investigate the role of disorder on the metallicity at the (001) ${\text{LaAlO}}_{3}/{\text{SrTiO}}_{3}$ heterointerface. We observe a trend of reduced mobility in higher sheet carrier concentration samples, and therefore speculate that disorder and…
The thickness of adsorbed polyelectrolyte layers on oppositely charged particles can be measured by dynamic light scattering (DLS) with a precision of fractions of a nanometer. However, such data can be only reliably obtained when effects of particle aggregation are carefully eliminated by working at low particle numb…
Highly uniform three-dimensional flower-like CaF2 and CaF2:Ln3+ (Ln = Er, Nd, Yb) nanostructures have been successfully prepared by a facile hydrothermal method assisted by a chelating reagent, ethylenediamine tetraacetic acid disodium salt (Na2EDTA). The nanoflowers with size about 550 nm are assembled by numerous na…
The ground spin-state of [Cu(phpyNO)(2)(H(2)O)(2)](BF(4))(2) was switched between S(total) = 1/2 and 3/2 across 175 K. On warming, the space group was changed from P2(1)2(1)2(1) to C222(1) in a single-crystal-to-single-crystal manner, and the transient structure could be monitored by means of the crystallographic anal…
Für eine Reihe von Cryptanden wurde die Oxidationsbeständigkeit der EuII-Komplexe in wässriger Lösung ermittelt (siehe Bild). Einer dieser EuII-Komplexe ist beständiger als FeII-Hämoglobin und somit wohl die am wenigsten oxidationsempfindliche EuII-Spezies in wässrigem Medium. Die hoch stabilen Komplexe sollten es erm…
We have developed a novel diffraction grating based on lithographical techniques and anisotropic etching in silicon. The grating is designed for the short-wave-infrared channel of the TROPOMI imaging spectrometer that will be launched on ESA's Sentinel 5 Precursor mission to monitor trace gases in the earth atmosphere…
We explore the consequences of electron-phonon (e-ph) coupling in graphene antidot lattices (graphene nanomeshes), i.e., triangular superlattices of circular holes (antidots) in a graphene sheet. They display a direct band gap whose magnitude can be controlled via the antidot size and density. The relevant coupling me…