Materials Literature
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The lattice parameters, five independent elastic constants and the bulk modulus B on the applied pressure of hexagonal boron nitride (h-BN) are calculated by using a first-principles pseudopotential method. The calculation results are in good agreement with the experimental and theoretical values. It is found that the…
Abstract Cu 2+ ‐doped ZnS quantum dots were synthesized by a chemical precipitation method in water/ethanol solution. The quantum dots obtained were characterized by X‐ray diffraction, transmission electron microscopy and spectroscopy techniques including X‐ray photoelectron spectroscopy. The [S 2− ]/[Zn 2+ ] ratios h…
Titanhart! Mit neuartigen, von Prolin abgeleiteten C1-symmetrischen Titan(salan)-Komplexen gelingt die Epoxidierung von Styrolderivaten mit wässrigem Wasserstoffperoxid als Oxidationsmittel mit Enantiomerenüberschüssen zwischen 96 und 98 % (siehe Schema).
In this paper, we present a new approach to the combinatorial discovery of amphiphilic maleic anhydride copolymers which can be used as a generic method for the optimization and control of hydrophobic nanoparticle phase transfer into the aqueous phase. This combinatorial multiwell chemical screening process resulted i…
Samaria‐doped ceria (SDC, Ce 0.8 Sm 0.2 O 1.9 ) ceramic powders of submicrometer size were synthesized by a sol–gel auto‐combustion method. From these powders microtubes with a dual structure comprising of a dense layer and a porous substrate layer were fabricated in a single step through a phase inversion/sintering t…
In this paper, 2.5D SiO2f/SiO2 composites were fabricated via sol-gel process employing 2.5D braided silica fiber fabrics as reinforcements and high pure silicasol as slurry. The process parameters are optimized and the optimal parameters are as follows: the silicasol of 30.8 wt. % as slurry, microwave drying, and sin…
Abstract Thin films of an Ag:ZrO 2 nanocomposite (NC) have been prepared using a novel sol–gel technique, employing HCl as a sol stabilizer. The technique facilitates the formation of Ag nanoparticles in a matrix of ZrO 2 via thermal annealing at relatively low temperature (300 °C). Transmission electron microscopy (T…
The wettability of silicon carbide by liquid CaO-SiO 2 slags that contain 47 to 60 wt pct SiO 2 was studied using the sessile drop wettability technique. The experiments were carried out in Ar and CO atmospheres. A small piece of slag was melted on SiC substrates under different heating regimes up to 1600 °C. It was f…
La2O3-doped ZnO-Bi2O3-based varistor ceramics were obtained by a solid reaction route, and the microstructure and electrical properties of the varistor ceramics were studied in this paper. The results showed with addition of 0-1.00mol% La2O3, La2O3-doped ZnO-based varistor ceramics were prepared in this paper with the…
Flat-surfaced and fully (111)-oriented Cu2O films were grown through a chelate-assisted electrochemical approach. Based on key roles of chelating agent, the flat surface of films controlled over the columnar-grained growth was obtainable with a root-mean-square roughness value below 3 nm. Cu2O films treated by a rapid…
Doped ceria has been pursued in the past decades as a promising electrolyte material for intermediate temperature‐solid oxide fuel cells. In this study, the effects of grain growth conditions on the densification and conductivity of Ca x Ce 1− x O 2− y ( x =0.05, 0.1, and 0.2) are systematically investigated. It has b…
In this study, Ti-doped W18O49 nanorods were prepared without any templates or catalysts using a modified plasma-arc gas-condensation technique. Structure investigations were conducted and the optical properties of the as-prepared nanorods were characterized by field emission gun scanning electron microscope, high-res…
Nanostructures based on multiwalled carbon nanotubes (MWNTs) are fabricated using plasma of the mixture of hydrogen and nitrogen gases. The plasma-sharpened tips of nanotubes contain only a few tubes at the apex of the structure and lead to the dramatic enhancement in the emission current density by a factor >10(6) wi…
We experimentally demonstrate a reflective-mode liquid crystal polarization grating with high reflectance, small grating period, and subms switching times. This switchable optical element can diffract ∼100% into a single order, have highly polarization-sensitive first orders, and have a polarization-insensitive zero o…
Zwei Co rücken zusammen: Die ersten Amidinato- und Guanidinatocobalt(I)-Komplexe liegen als ligandenverbrückte Dimere (siehe Bild) mit den kürzesten bekannten Co-Co-Wechselwirkungen vor. Die Art der Wechselwirkung wurde durch Berechnungen und Untersuchung der magnetischen Eigenschaften als eine Mehrkonfigurationenwech…
We report a straight-forward, solvent-free moderate temperature synthetic method for the production of several phosphorus-rich transition-metal phosphides (orthorhombic FeP 2, cubic CoP 3, cubic NiP 2, monoclinic CuP 2, and monoclinic PdP 2 ). Notably, this synthetic approach provides facile access to the high-tempera…
Medical applications of nanoparticular systems have attracted considerable attention because of their potential use in therapeutic targeting of disease tissues and their lower level of toxicity against healthy tissue, relative to traditional pharmaceutical drugs. The use of nanoparticular systems has been shown to ove…
A series of molybdenum/tungsten polyoxometalate compounds, namely, [(M II (HL) 2 )Mo 3 O 10 ] (M = Mn ( 1 ), Co ( 2 ), Ni ( 3 )), [Cu II 2 (L) 2 (HL) 2 ] 2 (Mo 8 O 26 ) ( 4 ), [Zn(HL) 2 (MoO 4 )] 2 ·HL·4H 2 O ( 5 ), [Cu II 4 (L) 6 WO 4 )]·3H 2 O ( 6 ) (HL = 3-(2-pyridyl)pyrazole), were designed and synthesized under h…
By means of electron paramagnetic resonance (EPR) measurements on thermally reduced Cr-doped ${\text{SrTiO}}_{3}$, we find a strong correlation between the ${\text{Cr}}^{3+}$ ions and oxygen vacancies $({\text{V}}_{\text{o}}\text{s})$. A charge compensation associated with the creation of ${\text{V}}_{\text{o}}\text{s…
Radical catalysis has been used to achieve addition of dodecanethiol and mercaptoacetic acid to 4-vinylpyridine (4VP), giving 4-(dodecylthiaethyl)pyridine (DTEP) and 4-pyridylethylthia-acetic acid (PETAA). The purified monoadducts have been characterized using 1H NMR and 13C NMR spectroscopy. Inhibition of the corrosi…