Materials Literature
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Die Anisotropie der Lanthanoide in drei Koordinationsverbindungen unterschiedlicher Topologie, die FeIII und LnIII (DyIII und TbIII) enthalten (siehe Diagramm; Clusterkerne), wurde mithilfe von 57Fe-Mößbauer-Spektroskopie untersucht. In der gleichen Kristallfeldumgebung zeigen Dy- und Tb-Ionen unterschiedliche Grade a…
Elastic interactions, arising from a difference of lattice spacing between two coherent phases in eutectic alloys with misfit stresses, can have an influence on microstructural pattern formation of eutectic colonies during solidification process. From a thermodynamic point of view the elastic energy contributes to the…
An inexpensive device housing communities of living cells is stabilized by C. J. Brinker, S. M. Brozik, and co-workers within a silica matrix, for cell-based environmental biosensing, as described on page 2743. Disparate cell lines (eukaryotic and bacterial) are co-entrapped, remaining viable and responsive even at in…
Band insulator Li1.5Co0.5RhO3 has been synthesized, in which Co and Rh atoms are partially disordered in the two-dimensional Co1/3Rh2/3O2 layer. Measurements of magnetic susceptibility indicate that Co(III) and Co(III) are both diamagnetic with low-spin configurations. The electrical resistivity and thermopower reveal…
The compound τ-(P-S,S-DMEDT-TTF)2(AuCl2) (AuCl2)y (where P-S,S-DMEDT-TTF is the compound pyrazino-(S,S)-dimethyl-ethylenedithio-tetrathiofulvale) crystallizes in the non-centrosymmetric space group I-42d, with a = 7.3260(1) Å and c = 67.5487(12) Å (RT data) and remains tetragonal in the temperature range from RT to 10…
CdTe nanocrystals (NCs) were fabricated through an organic synthesis. The growth and properties of CdTe NCs depended strongly on the preparation conditions. In a reaction system of octadecene and tetradecylphosphonic acid (TDPA), the growth was slow. CdTe NCs with cubic-like morphology were created in trioctylamine (T…
The proprietary materials used to repair concrete structures are often polymer-modified hydraulic binders. The influence of the presence of polymer on the properties of these composites has been studied, but few works have focused on the evolution of these properties when the material is applied on a structure exposed…
Scale is a mineral deposit usually formed on surfaces in contact with water. Scale deposition in petroleum \nproduction wells can be attributed to mixing of incompatible waters, changes in thermodynamic, kinetic and \nhydrodynamic conditions in oilfield operations. \nScale creates serious problems in producing, inject…
A combinatorial tiling of the sphere is naturally given by an embedded graph. We study the case that each tile has exactly five edges, with the ultimate goal of classifying combinatorial tilings of the sphere by geometrically congruent pentagons. We show that the tiling cannot have only one vertex of degree >3. Moreov…
On page 3699 Xin-Bo Zhang and co-workers report the synthesis of free-standing hierarchically porous carbon (FHPC) derived from a graphene oxide gel in nickel foam by a facile in situ sol-gel method. As a cathode for Li-O2 batteries, the FHPC electrode exhibits a large capacity and high rate capability. This study ope…
Abstract An original method, based on the energy‐dispersive X‐ray diffraction, has been recently proposed as a possible laboratory tool to accomplish long time resolved investigation of the water content in a proton exchange membrane fuel cell. However, this method has never been applied to a real working fuel cell. T…
Abstract Crystalline SnO2 nanowires with smooth surface and uniform diameter were readily produced via chemical vapor deposition (CVD) method on various current collectors including carbon paper, stainless steel and copper. The growth followed a vapor‐liquid‐solid (VLS) mechanism employing a gold thin film as the cata…
BACKGROUND: There is a need for field trials on testing agronomic potential of coal fly ash to engender routine use of this technology. Two field trials were undertaken with alkaline and acidic fly ashes supplied at between 3 and 6 Mg ha⁻¹ to acidic soils and sown to wheat and canola at Richmond (Eastern Australia) an…
The evolution of silica nanostructure morphology induced by local Si vapor source concentration gradient has been investigated by a smart design of experiments. Silica nanostructure or their assemblies with different morphologies are obtained on photoresist-derived three-dimensional carbon microelectrode array. At a t…
Electroplating bath additives become problematic when incorporated into electrochemically deposited copper as impurities. The surface segregation of these impurities during spontaneous microstructural transformation was monitored by secondary ion mass spectrometry and found to be no different than the surface chemistr…
The μm-scale spatial distribution of the elements of polycrystalline Cu(In1−xGax)Se2 absorber surfaces is examined using x-ray photoelectron emission microscopy. The chemical composition varies from grain to grain, and a direct, linear anticorrelation between the In 3d and Ga 2p photoemission line intensities is obser…
We show theoretically that stable ferroelectricity can be realized in a BaTiO3/Si heterojunction using first-principles calculations. Interfacial ferroelectric behavior is sensitive to the interface structure. Strong ferroelectric-semiconductor interactions would produce a fixed interface polarization and dominate the…
On page 3723, Won Bo Lee, Kookheon Char, and co-workers report the fabrication of Janus nanowalls and the phenomenon of lateral buckling in the walls. To realize Janus nanowalls, metal films are deposited on one side of the polymeric nanowalls. During the metal deposition, the nanowalls themselves buckle laterally bec…
A series of compounds KxTayW1-yO3 with x = 0.30, 0.00 ? y ? 0.30 and x = 0.55, 0.00 ? y ? 0.10 were synthesized by conventional solid-state method. The samples were characterized using XRD and FTIR spectroscopy. X-ray powder patterns reveal that the samples with compositions x = 0.30, y ? 0.30 show hexagonal tungsten…
The electrical conductivity of the organic Mott insulator ET-F2TCNQ (ET = bis(ethylenedithio)tetrathiafulvalene, F2TCNQ = 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal was found to be enhanced by conjugation with a tetrathiafulvalene (TTF) single crystal on its surface; surface sheet resistance decreased from…