Materials Literature
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Experimental Section Synthesis. Pb(NO3)2 (Junsei, 99.5%), PbO (Kanto, 98.5%), PbCl2 (Hayashi, 99%), V2O5 (Junsei, 99.0%), and NaCl (Duksan, 99.0%) were used as received. Crystals of PbVO3Cl were prepared by a hydrothermal reaction method. 1.449 g (4.38 mmol) of Pb(NO3)2, 0.106 g (1.82 mmol) of NaCl, 0.113 g (0.63 mmol…
We review various published definitions associated with the phenomenon of negative phase velocity propagation of electromagnetic waves in meta-media, as observed through negative refraction. For the principal definition, based on the Poynting vector and the wave vector having negative scalar product, we summarise the…
The electrospinnability of pitch was improved by blending in a solution of polyacrylonitrile (PAN) resulting in the reduction of the average fiber diameter from 2000 to 750 nm. Activated carbon fibers (ACFs) derived by stabilization, carbonization and steam activation at 700, 800, and 900 <TEX>${^{\circ}C}$</TEX> of t…
We show that strong photoluminescence (PL) can be induced in single-layer graphene on using an oxygen plasma treatment. PL characteristics are spatially uniform across the flakes and connected to elastic scattering spectra distinctly different from those of gapless pristine graphene. Oxygen plasma can be used to selec…
We have investigated the evolution of the low temperature specific heat anomaly (TN=5.4K in zero field) in polycrystalline SmFeAsO samples with magnetic fields up to 35T. The anomaly remains very sharp up to 16T and becomes rounded with little shift in temperature at higher fields. Doped (superconducting) SmFeAsO0.85F…
BiFe1− x Ta x O3 (x = 0, 0.05, 0.1) nanopowders have been fabricated by a simple sol–gel method. Dielectric measurements at microwave frequencies (2–18 GHz) were made using a vector network analyser. Without tantalum, the BiFeO3 nanopowder presents a relaxation-like response with a characteristic frequency of 15 GHz,…
The atomic structure of an asymmetrical near Σ = 27 {525} tilt grain boundary (GB) in copper is determined by coupling high-resolution transmission electron microscopy and molecular dynamics simulation. The average GB plane is parallel to {414} in crystal (1) and {343} in crystal (2). The detailed GB structure shows t…
Microstructure evolution and its influence on the mechanical properties of (Ti65.5Fe34.5)100− x Nb x (x = 0, 3, 5 and 7) ultrafine composites has been investigated. The Nb-containing alloys exhibit simultaneously improved compressive mechanical properties, i.e. high yield (1.9–2.2 GPa) and fracture (2.2–2.6 GPa) stren…
So far no cases of nephrogenic systemic fibrosis (NSF) have been published on macrocyclical gadolinium-based contrast media (Gd-CM), assumed as low NSF risk CM due to their complex stability. In our haemodialysis-dependent patient, the first symptoms indicating NSF appeared about 16 months after the exposure to Gadovi…
Tightly coupled, regio- and diastereomerically pure subphthalocyanine–C60 dyads (see space-filling depiction; B orange, C light blue, H gray, N blue, O red), tethered by means of a tris-addition reaction, can follow different mechanisms on photoexcitation (electron transfer or energy transfer), depending on the spacin…
Structural, cohesive, and magnetic properties of two symmetric $\Sigma3(111)$ and $\Sigma5(210)$ tilt grain boundaries (GBs) in pure bcc Fe and in dilute FeCr alloys are studied from first principles. Different concentration and position of Cr solute atoms are considered. We found that Cr atoms placed in the GB inters…
On top of old ceria: Vanadyl-terminated monomers, trimers (see picture), and oligomers form on a CeO2(111) surface, and their atomic structure is resolved using a combination of high-level experimental and theoretical results. Ceria surfaces stabilize vanadia species in a +5 oxidation state, which wet and chemically r…
The organizational structure of a network is investigated with a simulated precipitation model which does not make use of prior knowledge about the community structure of the network. The result is presented as a structure profile through which various definitions of communities can be applied for specific application…
We present results of ab-initio calculations of the electronic band structure, lattice dynamical properties, and elastic constants of LaOFeAs, the parent compound of the recently discovered superconducting iron-oxypnictide (LaO1-xFxFeAs). The total and partial electronic density of states (EDOS) of the undoped LaOFeAs…
We present a method for extracting high-spatial resolution dielectric constant data at microwave frequencies. A scanning near field microwave microscope probes a sample and acquires data in the form of the frequency and quality factor shifts of a resonant cavity coupled to the sample. The approach reported here is to…
The living cationic ring-opening polymerization of 2-oxazolines has been studied in great detail since its discovery in 1966. The versatility of this living polymerization method allows copolymerization of a variety of 2-oxazoline monomers to give a range of tunable polymer properties that enable, for example, hydroph…
The properties and efficiency of the emission current density produced by a metallic array of pyramidal structures are investigated. The theoretical results obtained by numerical integration of the corresponding Laplace equation using a finite differences scheme offer useful information for the optimization of field e…
A newer composition of self-flowing low cement brown fused alumina castable containing 971U type microsilica was developed. Optimum flow characteristics were achieved using water addition of 4·6 wt-%. This batch was sintered at different firing temperatures up to 1500°C. To understand the effect of both firing tempera…
The interaction between an active oxide and an oxide support plays a critical role in controlling the reactivity of oxide-on-oxide catalysts. In the present study, the reactivity of a small ceria cluster (Ce 2 O 4 ) supported on the reducible monoclinic zirconia and the irreducible γ-alumina was investigated using the…
An asymmetrically tapered N,N'-tris[[(2-dodecylaminocarbonyl)ethyl]methyl]-4-biphenylamide (asym-C(12)PhA, where n is the number of carbon atoms in the alkyl chains, n = 12) was newly designed and synthesized. In this asymmetrically tapered asym-C(12)PhA biphenylamide, H-bondable hydrophilic amide moieties are located…