Materials Literature
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Phase transitions in submicrometric Ga droplets confined in epoxy resin are studied by combining energy-dispersive x-ray diffraction (EDXRD), x-ray absorption fine structure, and single-energy x-ray absorption. The restricted fluid is undercooled down to 150 K while the melting point is depressed down to 254 K. Meltin…
The properties of ferroelectric films are known to degrade when subjected to hydrogen in forming gas anneals. Earlier studies have attributed this degradation to the loss of oxygen from these films during these anneals. In this study, we show that though oxygen is lost during forming gas annealing, hydrogen incorporat…
Specimen Preparation Procedures in X-Ray Fluorescence Analysis. Specimen Preparation in X-Ray Fluorescence. Specimen Preparation in X-Ray Diffraction. Specific Areas of Specimen Preparation in X-Ray Powder Diffraction. Special Problems in the Preparation of X-Ray Diffraction Specimens. Specimen Preparation for Camera…
Ac conductivity measurements were carried out on polycrystalline samples of a ferrimagnetic spinel (Zn0.44Mn0.56Fe2O4) and a ferroelectric perovskite (Sr0.25Bi4Ti3.25O12.75), in the temperature range 20–160 and 20–660 °C, respectively, and in the frequency range 5 Hz–13 MHz. The impedance response in both cases could…
We study the time evolution of a sessile liquid droplet, which is initially put onto a solid surface in a non-equilibrium configuration and then evolves towards its equilibrium shape. We adapt here the standard approach to the dynamics of mechanical dissipative systems, in which the driving force, i.e. the gradient of…
We introduce a simple mode-coupling model for concentrated suspensions under flow. This model exhibits a jamming transition and stress vs shear rate relations which are very similar to experimental results. Namely, a Newtonian regime or yield stress are followed by a slow variation of the stress for higher shear rates…
Carrier-induced ferromagnetism in the doped diluted magnetic semiconductors $(\mathrm{In},\mathrm{Mn}\ensuremath{\uparrow},\mathrm{Mn}\ensuremath{\downarrow},A)\mathrm{As}$, where $A$ is As or Sn and $\mathrm{Mn}\ensuremath{\uparrow}$ ( $\mathrm{Mn}\ensuremath{\downarrow}$) denotes Mn atoms whose local magnetic moment…
Multicrystalline silicon wafers, widely used in commercial photovoltaic cell production, traditionally give much poorer cell performance than monocrystalline wafers (the previously highest performance laboratory devices have solar energy conversion efficiencies of 18.6% and 24.0%, respectively). A substantially improv…
Oxidative degradation of a flexible PVC pellet (F-PVC) with oxygen was carried out in 1–25-mol/kg(m)-H2O NaOH solutions, at 150–260°C and 1–10 MPa. Dehydrochlorination of F-PVC occurred first, followed by oxidation. The major products were oxalic acid, a mixture of benzenecarboxylic acids, and CO2. We obtained 320 g o…
Poly(ε-caprolactone)s (PCL) with slip masterbatch, Erucamide, SiO2 and Erucamide + CaCO3 as low-molecular-weight processing additives, were film-blown in a single screw extruder. The films and recycled PCL without additives were exposed to composting, anaerobic sewage sludge (37 and 55°C), pure fungal culture, and che…
A heterogeneous copper catalyst was developed using a novel technique metallo-organic chemical vapor deposition (MOCVD). Highly porous activated carbon was selected as the catalyst support to provide a high specific area. Copper acetylacetonate was used as the precursor. The precursor was evaporated by heating, transp…
Plasma polymerization of thiophene was carried out in a tubular reactor using an rf source. Various substrates such as aluminum, glass, and NaCl crystal were used. The rate of deposition attained an equilibrium value of 0.35 μg cm−2 s−1. Infrared spectra revealed the formation of polythiophene. The films were found to…
Copolymerization of ethylene and styrene by the INSITETM technology from Dow presents a new polymer family identified as ethylene–styrene interpolymers (ESI). Based on the combined observations from melting behavior, density, dynamic mechanical response, and tensile deformation, a classification scheme with 3 distinct…
CB2, a CNBr peptide of 36 residues from type I collagen alpha1(I) chain has been studied by NMR spectroscopy as a function of temperature. At low temperature, the guanidinium protons of Arg9 showed sharp 1:1:1 NMR triplets around 6.95 ppm, characteristic of 14N coupled protons (1J(NH)=52 Hz) when the quadrupolar relax…
Experimental solubilities are reported for anthracene dissolved in ternary 1-propanol + 1-butanol + cyclohexane, 1-propanol + 2-butanol + cyclohexane, 2-propanol + 1-butanol + cyclohexane, and 2-propanol + 2-butanol + cyclohexane solvent mixtures at 298.15 K. Nineteen compositions were studied for each of the four sol…
Edible films used as moisture barriers can enhance food quality. Dispersed phase particle size distributions of microfluidized whey protein−fatty acid emulsion films were measured to determine the effect of fatty acid type on microstructure. Emulsions of saturated fatty acids from C 14 to C 22 and whey protein isolate…
Beachtlich erweitert wurde die Gruppe der Ag-Se-Cluster durch die Synthesen der Titelverbindungen – eine Bestätigung für das Konzept, durch das Anbringen von organischen Liganden an der Clusteraußenseite die Zusammenlagerung zu stabilen binären Seleniden zu vermeiden. Das als Schutzligand verwendete Phosphan hat einen…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
A noncyanocarbon-based molecule-based magnet [MnIIITPP]+[QCl4].− has been prepared, comprising tetraphenylporphinatomanganese(III), MnIIITPP, and tetrachloro-1,4-benzosemiquinone, QCl4. As structural motif it has a coordination-polymer structure with uniform, one-dimensional linear chains of alternating, albeit disord…