Materials Literature
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Beautiful offspring: Manganese/oxide/carboxylate-cluster chemistry continues to surprise with its rich variety of structural types. Here a new Mn21 cluster (see picture Mn4+ (red), Mn3+ (green)) with a 12 MnIII9 MnIV oxidation level and an approximately planar core is reported.
Progress reports are a new type of article in Advanced Engineering Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opin…
Low-k films with k of 2.5–2.9 were deposited under different conditions of pressures and temperatures using a plasma-enhanced chemical vapor deposition (PECVD) system. These films were prepared using a new liquid precursor, tetravinyltetramethylcyclotetrasiloxane (TVTMCTS) and H2 carrier gas. The rf power was kept as…
Resonance enhanced multiphoton ionization and cavity ring down spectroscopies have been used to provide spatially resolved measurements of relative H atom and CH3 radical number densities, and NH column densities, in a hot filament (HF) reactor designed for diamond chemical vapor deposition and here operating with a 1…
The structures of cis and trans forms of a binuclear subphthalocyanine (SubPc) have been determined by X-ray crystallography (see pictures). Electronic absorption and magnetic circular dichrosim spectra of these dimers are similar in shape, but the Q band of the trans isomer appears at longer wavelength than that of t…
X-ray diffraction measurements have been performed on a single crystal sample of the rare earth metal holmium. The temperature and magnetic field dependence of the c -lattice parameter was studied in detail below the Néel temperature of 132 K. Magnetic structural phase transitions were observed as a change in the c -l…
Nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been prepared by the sol-gel method and their structure and magnetic properties have been analyzed by x-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. When thermal treatment temperature is below 800 °C, the samples pressed i…
The spontaneous-emission lifetime of CdSe/CdS core-shell quantum dots was studied as a function of the distance between the dots and a polished Si surface. The experimental results reveal a significant modification of the spontaneous-emission rate of the quantum dots by the Si surface.
The structural and optical properties of nitrogenated amorphous carbon films, grown by rf-magnetron sputtering on silicon substrates, were studied by Raman and photoluminescence (PL) spectroscopy as a function of the nitrogen concentration and the substrate bias voltage Vb. For films deposited with Vb=10 V, the photol…
We have investigated the luminescence phenomena from stress-activated ZrO2:Ti. The luminescence is clearly visible to the naked eye in the atmosphere. The luminescence center has been identified as the Ti4+ ion from spectra of the mechanoluminescence and also from photoluminescence studies of ZrO2:Ti. The mechanolumin…
We present the composition dependence of the Seebeck coefficient and the electrical conductivity of AlPdRe icosahedral alloys. As the concentration of transition metal (either Pd or Re) increases, the Seebeck coefficient rapidly increases. The strong composition dependence is related to the pseudogap structure in the…
We describe two new boron-based nanotubes: $\text{B}\text{ }{\text{ ︀}}_{2}\text{O}$ and $\text{BeB}\text{ }{\text{ ︀}}_{2}$. Both are isoelectronic to graphite, have reasonable curvature energies, and have already been made in their bulk planar forms. The lowest energy allotrope of planar single-layer $\text{B}\text{…
Chemistry, energy, and spatial distributions of species in carbon–nitrogen plasma plumes were investigated to define plasma conditions for growth of carbon nitride CNx films with a fullerene-like structure. Plumes were generated by ablation of graphite using a 248 nm excimer laser in the presence of low-pressure nitro…
Industrial condensation reactions are usually homogeneously catalysed by strong caustic. Recent work has demonstrated the practical application of heterogenised base catalysts, which enhance selectivity and eliminate the generation of organically contaminated waste caustic streams. A number of successful systems have…
Light-switching behavior of reflective reserved-mode polymer-stabilized-cholesteric-texture (PSCT) was analyzed and validated experimentally. Our results indicate that the reflective reversed-mode PSCT offers a much higher contrast ratio and lower operating voltage than its transmissive counterpart. Effects of cell ga…
We present a unified method to estimate current–voltage characteristics of insulators starting from ab initio electronic calculations of the properties of the dielectric material. The method consists of three stages: (1) computation of trap energy distributions for excess electrons by means of density functional theor…
The syn and anti topoisomers of fused subphthalocyanine dimers were synthesized and characterized. The space-filling model of the anti topoisomer is depicted. These compounds are the first step towards the synthesis of larger curved π surfaces.
Phasins (PhaP) are predominantly polyhydroxyalkanoate (PHA) granule-associated proteins that positively affect PHA synthesis. Recently, we reported that the phaR gene, which is located downstream of phaP in Paracoccus denitrificans, codes for a negative regulator involved in PhaP expression. In this study, DNase I foo…
We report the discovery of a new superconducting phase in highly correlated $3d$ electron systems. The compound is $\ensuremath{\beta}$-vanadium bronze, $\ensuremath{\beta}\ensuremath{-}{\text{Na}}_{0.33}{\text{V}}_{2}{\text{O}}_{5}$, in which the charge-ordered phase collapses under hydrostatic high pressure and a pr…
Catalytically active nanoparticle sites: Different catalytic activity of different active sites coexisting on a supported nanoparticle has been directly observed using molecular-beam techniques and in situ surface vibrational spectroscopy. For methanol decomposition on a supported Pd model catalyst (see picture), it i…