Materials Literature
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The effects of high pressures on the structure of silica glass have been elucidated using high-energy x-ray diffraction up to 43.5 GPa. A decrease in the first two peak positions in the real-space pair-distribution functions up to 15 GPa indicates an initial shrinkage of the tetrahedral units. Above this threshold pre…
Using the de Haas-van Alphen effect we have measured the evolution of the Fermi surface of BaFe2(As1-xPx){2} as a function of isoelectric substitution (As/P) for 0.41<x<1 (T{c} up to 25 K). We find that the volumes of electron and hole Fermi surfaces shrink linearly with decreasing x. This shrinking is accompanied by…
In a nutshell: A nanosized core/shell cluster has been synthesized by reaction of AgCCtBu with AgOTf in the presence of a polyoxometalate (POM) template under solvothermal conditions. The peanutlike structure (see picture) consists of two Mo6O228− nuts (green) and an Ag60 shell (purple). Electrochemical studies revea…
High-resolution x-ray diffraction measurements reveal an unusually strong response of the lattice to superconductivity in Ba(Fe1-xCox)2As2. The orthorhombic distortion of the lattice is suppressed and, for Co doping near x=0.063, the orthorhombic structure evolves smoothly back to a tetragonal structure. We propose th…
The high carrier mobility of graphene has been exploited in field-effect transistors that operate at high frequencies. Transistors were fabricated on epitaxial graphene synthesized on the silicon face of a silicon carbide wafer, achieving a cutoff frequency of 100 gigahertz for a gate length of 240 nanometers. The hig…
ABSTRACT Wrought magnesium alloys AZ80 and ZK60 were extruded at 300 °C with extrusion ratios of ER = 12 and 44. Resulting microstructures, crystallographic textures and mechanical properties were investigated. Extruding led to profound reduction in grain size, which drastically improved yield stress, tensile elongati…
The scattering of low energy alkali ions is used to probe the atomic and electronic structures of Au nanoclusters grown onto an untreated silicon (111) wafer. Charge-state-resolved time-of-flight spectra were collected for 2 keV (7)Li (+) and (39)K (+) as a function of Au coverage. The shapes of the spectra are interp…
Diffractions by the one-dimensional high-density grating in the near field with TM and TE polarization illuminations are studied, and the diffraction intensity distributions are calculated with the finite-difference time-domain technique. The calculation results show that the diffractions of the high-density grating w…
Numerical investigation of the thermal partial oxidation process of Methane in porous media based reformer is performed. A finite volume based CFD code, including radiation modeling, in combination with a detailed chemical kinetics scheme is used to perform the numerical simulation. A heterogeneous approach for the he…
Abstract Low‐density polyethylene/polyamide 6 (LDPE/PA6) blends were in situ formed by reactive extrusion, in which in situ polymerization of ε‐caprolactam (CL) and in situ copolymerization of maleic anhydride grafted low‐density polyethylene (LDPE‐MA) and CL took place simultaneously. The latter reaction could be con…
A photodetecting device with enhanced efficiency has been fabricated by using a blend of IR sensitive quantum dots (QDs) and carbon nanotubes (CNTs). Measurements on the facile physical mixtures of PbSe QDs, and CNTs in compatible solvents show quenching of the IR photoluminescence of QDs due to the presence of the CN…
Durchaus vergleichbar: Eine Graphen-Monoschicht dient als Substrat für den Aufbau von zweidimensionalen wasserstoffverbrückten supramolekularen Strukturen (siehe STM-Bild). Der Bildung der ausgedehnten Strukturen liegt ein kommensurables Verhalten zwischen den Abmessungen der Superstrukturen und dem vom Graphen gebild…
In this paper, the analysis of the stretch—blow moulding (SBM) process of polyethylene terephthalate (PET) bottles is studied by the finite element method (FEM). In this simulation, owing to the symmetry of bottle geometry, the parts are considered as an axisymmetric model. A hyperelastic constitutive behaviour was ca…
We report structural investigations into (MoO(2))(2)P(2)O(7) using a combination of X-ray, neutron and electron diffraction, and solid-state NMR supported by first principles quantum chemical calculations. These reveal a series of phase transitions on cooling at temperatures of 377 and 325 K. The high temperature gamm…
Abstract This study explored the possibility of preparing a new thio accelerator, N ‐benzylimine aminothioformamide to investigate its synergic accelerator activity in three conventional binary accelerator systems, N ‐cyclohexyl benzothiazyl sulfenamide, mercapto benzothiazyl disulfide, and tetramethylthiuram disulfid…
Equal channel angular extrusion (ECAE) is a process used to impart severe plastic deformation within the material billet. This has a great deal of interest because of the improvement achieved in the mechanical properties of the material to be processed. In this study, a finite element method (FEM) analysis has been us…
Arrays of stilbenes have been prepared in high purity by using Heck reactions on planar cellulose support, and demonstrate the compatibility of the small-molecule macroarray platform (see figure) with metal-mediated reactions for the first time. Biological screening of the stilbene library revealed several compounds w…
The present study involves synthesis and characterization of M(IV) phosphates and tungstates which are inorganic cation exchangers of the class of tetravalent metal acid (tma) salts possessing structural hydroxyl groups, the H of the structural −OH being the cation exchange sites, which indicates good potential for ap…
Hydrogen can be used as a temporary element to refine microstructure and improve workability of titanium alloys. In this article, the influence of hydrogen on the microstructure evolution and tensile properties of TC21 alloy is investigated. The microstructure observation reveals that the FCC hydrides δ precipitate fi…
Alane (AlH 3 ) has attracted much recent attention for various energy related applications. Amines are commonly used as stabilization agents in alane complexes, with N -methylpyrrolidine (NMP) in particular for favorable properties. However, there have been complications in the study of alane−NMP complexes due to the…