Materials Literature
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A series of TiO2-TUD-1 samples was synthesized with a variable Ti loading in the range Si/Ti = 100, 20, 2.5, and 1.6, by using a one-pot surfactant-free procedure. The materials obtained were characterized by elemental analysis; X-ray diffraction (XRD); N2 sorption measurements; high-resolution TEM (HR-TEM); 29Si NMR,…
A fast decay emission peaking at 645 nm with a decay lifetime within the experimental resolution of 0.14 micros is observed in ZnS:Mn2+ nanoparticles. This short-lived signal is also observed in pure ZnS and MgS: Eu3+ nanoparticles, which has nothing to do with Mn(2+)-doped ions but is from the deep trap states of the…
The interaction of the trivalent lanthanides Ce(III), Eu(III), and Tb(III) with sodium deoxyribonucleic acid (DNA) in aqueous solution has been studied using their luminescence spectra and decays. Complexation with DNA is indicated by changes in luminescence intensity. In the system terbium(III)-DNA, changes in lumine…
Abstract The corrosion and hydriding behavior of M5 and low tin Zircaloy-4 in PWR have been compared at high burn-ups (>70 GWd/t). Whereas low tin Zircaloy-4 reached about 90 μm in oxide thickness and is subjected to significant precipitation of hydride rims at the metal/oxide interface, the oxide layer on M5 r…
Ab initio calculations on ${\mathrm{Rh}}_{n}\phantom{\rule{0.3em}{0ex}}(n=8--64)$ clusters surprisingly show simple cubic structures to be most favorable up to $n\ensuremath{\sim}27$. These are stabilized by eight center bonding and lie significantly lower in energy than the icosahedral isomers found in previous studi…
It was discovered 10 years ago that the exposure of an initially flat layer of an azobenzene-containing polymer to an inhomogeneous light pattern leads to the formation of surface relief structures, accompanied by a mass transport over several micrometers. However, the driving force of this process is still unclear. W…
Structural stability, adhesion, and chemical bonding of the $\mathrm{Ag}(111)∕\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ (0001) and $\mathrm{Au}(111)∕\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ (0001) interfaces are investigated by an ab initio approach ba…
M\"obius-shell structures and their physical properties have recently received considerable attention experimentally and theoretically. In this work, eigenstates and associated eigenenergies are determined for a quantum-mechanical particle bounded to a M\"obius shell including curvature contributions to the kinetic-en…
Abstract Polypropylene (PP)/organo‐montmorillonite (Org‐MMT) nanocomposites toughened with maleated styrene‐ethylene‐butylene‐styrene (SEBS‐ g ‐MA) were prepared via melt compounding. The structure, mechanical properties, and dynamic mechanical properties of PP/SEBS‐ g ‐MA blends and their nanocomposites were investig…
Absolute differential elastic and vibrational excitation cross sections have been measured for N 2 in the scattering angle ranges starting between 0° and 20° and extending to 180°, at energies between 0.8 and 5 eV. The results agree with many previous measurements, in particular for angles around 90°, but discrepancie…
Molecular brushes with poly(dimethylsiloxane) (PDMS) side chains were prepared by atom transfer radical polymerization (ATRP) conditions via macromonomer method ( grafting through ). The well-defined polymers with molecular weight distribution M w / M n = 1.22−1.35 and with up to 350 repeating units of macromonomers w…
In this paper, we have addressed the question of the dynamic miscibility in a blend characterized by very different glass-transition temperatures, Tg, for the components: poly(ethylene oxide) and poly(methyl methacrylate) (PEO/PMMA). The combination of quasielastic neutron scattering with isotopic labeling and fully a…
The epoxidation of propene over gold/titania based catalysts was investigated using different techniques. Infrared spectroscopic information showed that one key step in the reaction mechanism is a reaction catalyzed by gold between titania surface groups and propene. In this reaction step, a bidentate propoxy species…
We report on a detailed experimental study of capillary condensation-evaporation processes of N(2) in ordered mesoporous SBA-15 silica. We have carried out measurements of boundary hysteresis loops, reversal curves, and subloops in order to test whether this material behaves as an assembly of independent cylindrical p…
A novel self-assembly route to ordered silica-organic hybrids using well-defined siloxane oligomers with alkoxy functionality and covalently attached alkyl chains has been investigated. Various hybrid mesostructures were obtained by hydrolysis and polycondensation without the use of any structure-directing agents. The…
Tetrapod-shaped CdSe nanocrystals have been successfully synthesized in high yields using a simple method of controlling the protonic acidity of the reaction system. A possible growth mechanism is discussed on the basis of the surface modification of H + present. The crystal structure of CdSe tetrapods is determined b…
Screen printing of thin yttria‐stabilized zirconia (YSZ) electrolytes onto NiO–YSZ anode supports was studied. Experimental parameters studied included screen printing ink composition and rheology, screen printer settings, NiO–YSZ anode support thickness pre‐fire temperature, sintering temperature, and ramp rate. Visc…
A simple one-step hydrothermal method for large-scale synthesis of ultralong single-crystalline Bi2S3 nanowires was reported, and the nanowires were comprehensively characterized. The diameters of the nanowires are about 60 nm, and their lengths range from tens of microns to several millimeters. The structure of the n…
Cutting Corners: Elaborate triangular arrays of Mn ions are stabilized by the tripodal ligand 1,1,1-tris(hydroxymethyl)ethane. The self-assembled {Mn32} truncated cube (see picture) is further stabilized by end-on-bridging azide ligands and acetate groups. Such stabilization could prove to be useful in the preparation…
In this paper we report an electron microscopic observation of crystal shape development when PbSe nanocrystals were synthesized using a dynamic injection technique at different temperatures in the presence of oleic acid. A two-step evolution mechanism was proposed, indicating that the shape evolution of PbSe nanocrys…