Materials Literature
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Structural materials in nature exhibit remarkable designs with building blocks, often hierarchically arranged from the nanometer to the macroscopic length scales. We report on the structural properties of biosilica observed in the hexactinellid sponge Euplectella sp. Consolidated, nanometer-scaled silica spheres are a…
A wide variety of experimental results and theoretical investigations in recent years have convincingly demonstrated that several transition metal oxides and other materials have dominant states that are not spatially homogeneous. This occurs in cases in which several physical interactions-spin, charge, lattice, and/o…
The title compound, pentabarium tris(vanadate) chloride, crystallizes in the well known apatite structure type, with space group P63/m and Z = 2. The crystal structure contains isolated (VO4)3− tetrahedra that are bridged by Ba2+ ions. The intermediate Cl− anions, situated on positions with \overline{3} symmetry,…
Previous in situ small-angle neutron scattering studies of nitrogen adsorption and desorption at 78 K on the mesoporous silica xerogels Gelsil 50 and Gelsil 75 revealed the formation of ramified clusters of vapor-filled pores on desorption, which is characteristic for a percolation process. In the present work, we che…
We have investigated the electronic structure of electron-doped ${\mathrm{Sr}}_{2\ensuremath{-}x}{\mathrm{La}}_{x}\mathrm{Fe}\mathrm{Mo}{\mathrm{O}}_{6}$ ($x=0.0$ and 0.2) by photoemission spectroscopy and band-structure calculations within the local density $\text{approximation}+U$ scheme. A characteristic double-pea…
This paper presents the 1-phase transformer core loss estimation under non-sinusoidal voltage supply. The Epstein test apparatus, with grain oriented magnetic steel side MS (0.3 mm), inverter and low pass filter is used in estimation of core loss. The calculated results are compared with the measured value and are use…
A two-step process was developed to prepare a direct heteronanojunction of ZnO nanorods on SiC nanowires, using a simple heating method and metal–organic chemical vapour deposition (MOCVD). First, an SiC nanowire substrate was prepared by heating NiO catalysed Si wafer at 1050 °C. Subsequently, diethylzinc was used as…
Partial discharge measurements have been widely recognized as the most effective diagnostic method for on-line condition assessment. However on-line partial discharge (PD) measurements taken on site are frequently effected by external electrical-magnetic (EM) interference. Extracting low level PD signal from noisy bac…
The adhesion and bending modulus of polybutadiene-poly(ethylene oxide) block copolymer vesicles made from a bidisperse mixture of polymers is measured using micropipette aspiration. The adhesion energy between biotinylated vesicles and avidin beads is modeled by incorporating the extension of the adhesive ligands abov…
We present experiments where opposed pairs of planar parallel disclination lines of topological strength s=+/-1 move due to their mutual attraction. Our measurements show that their motion is clearly asymmetric, with +1 defects moving up to twice as fast as -1 ones. This is a clear indication of backflow, given the in…
Confinement in molecular sieves is a promising strategy for fabricating nanostructured semiconductor assemblies with a highly uniform size and shape distribution. However, disorder effects often hamper the engineering of matrix-embedded cluster materials with specific properties. The host-guest interaction is a key fa…
This paper demonstrates the fabrication of a membrane permeated by a silicon dioxide nanocapillary array for manipulating highly charged ions at the nanoscale. The fabrication method involves (i) the formation of pores at the nanoscale on lithographically patterned, n-type silicon using photo-assisted electrochemical…
The transverse polarizabilities of carbon nanotubes are computed using Hartree-Fock (HF) and density functional theory (DFT). The results of these calculations have implications for nanoelectronics, specifically for the possibility of using nanotubes as shielding for nanoelectrical components, as the results do not su…
The crystal structure of the mineral polyhalite, or dipotassium dicalcium magnesium tetrakis[sulfate(VI)] dihydrate, was reinvestigated by means of single-crystal X-ray diffraction data. The structural model previously reported was confirmed, although a higher precision of the refinement has been achieved. The stru…
Abstract The synthesis of zinc silicate‐coated microparticles with well‐controlled three‐dimensional (3D) shapes, via chemical modification of the surfaces of diatom microshells, is demonstrated. ZnO nanoparticle‐based coatings were first applied by exposing the microshells to a zinc acetate‐bearing solution and then…
Poly(ethylene terphthalate) (PET) films were photografted under reduced pressure in a solvent-free vapor of acrylamide and a co-initiator, benzophenone. Characterization of grafted samples by ESCA and contact angles showed that the grafting increased with grafting time and temperature. The amide groups obtained by the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCryogenic Transmission Electron Microscopy Imaging of Vesicles Formed by a Polystyrene−Polyisoprene Diblock CopolymerEllina Kesselman, Yeshayahu Talmon, Joona Bang, Sayeed Abbas, Zhibo Li, and Timothy P. LodgeView Author Information…
The Schottky barrier at the metal-nanotube contact has been a prime issue in the nanoscale devices. Here we use ab initio density-functional calculations to investigate the electronic structure and the Fermi level alignment at the metal-nanotube contacts. Consistent with the common concept of the large (small) work fu…
Using first-principles theory, we predict ferromagnetism in Cr-doped GaN nanowires irrespective of the sites that the Cr atoms occupy. This is in contrast to Mn-doped GaN nanowires in which the magnetic coupling between the Mn atoms is sensitive to the Mn--Mn and Mn--N distances, although the ground state of Mn-doped…
Salen im Doppelpack: Die Meerwein-Ponndorf-Verley-Reduktion von [Ti(salen)(OiPr)2]-Komplexen (salen=Bis(salicyliden)ethylendiaminato) führt nach anschließender Umsetzung mit Wasser zu pseudo-heterochiralen und homochiralen Di-μ-oxo-Titandimeren. Diese Dimere, z. B. das (aR,S,Δ,aR,S,Δ)-Dimer 1, katalysieren die Epoxidi…