Materials Literature
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The authors report on the growth of spinel ZnM(d6)2O4 (M=Co, Rh, and Ir), a p-type wide band gap semiconductor by pulsed laser deposition. The band gap of these compounds is determined by the ligand field splitting in the subbands of the metallic d6 cation. Photoemission spectroscopy revealed that the valence band max…
Wave propagation in carbon nanotubes (CNTs) is studied based on the proposed nonlocal elastic shell theory. Both theoretical analyses and numerical simulations have explicitly revealed the small-scale effect on wave dispersion relations for different CNT wavenumbers in the longitudinal and circumferential directions a…
A two-core transducer assembly using a Fe73.5Nb3Cu1Si13.5B9 ribbon to detect a change of magnetic field is proposed and tested for displacement (linear and angular) and current sensor. Two identical inductors, with the ribbon as core, are a part of two series resonance network, and are in high impedance state when exc…
We present the study on Bloch T3/2 law and its applicability in ferromagnetic cobalt nanoparticles with sizes 25 and 38 nm. Bloch has derived the T3/2 law by assuming long wave-length spin-waves to be excited at low temperatures. But, in nanoparticles the wavelength of the spin wave is confined by the size of the magn…
The effect of nonmagnetic metal additives in metallic antiferromagnets (AFMs) on the exchange bias (EB) has been investigated from a structural, magnetic and Monte Carlo simulation point of view in bilayers of CoFe/IrMn:Cu. Dilution by Cu atoms throughout the volume of the AFM IrMn give rise to an enhanced EB field fo…
The authors performed a soft x-ray magnetic circular dichroism (XMCD) study of a Zn1−xVxO thin film, which showed a small ferromagnetic moment. Field and temperature dependences of V 2p XMCD signals indicated the coexistence of Curie-Weiss paramagnetic and antiferromagnetic V ions, quantitatively consistent with the m…
Dielectric characteristics of Ba(Fe1∕2Nb1∕2)O3 ceramics were investigated over a broad temperature and a frequency range. Two dielectric relaxations following Arrhenius law were observed at 150–400 and 406–650K. An extremely high relaxorlike dielectric peak (202 270 at 5Hz, 91 930 at 1kHz, and 37 030 at 100kHz) with v…
For VO2-based two-terminal devices, the first-order metal-insulator transition (MIT, jump) is controlled by an applied voltage and temperature, and an intermediate monoclinic metal phase between the MIT and the structural phase transition (SPT) is observed. The conductivity of this phase linearly increases with increa…
Simple models for the thermal conductivity enhancements in carbon nanotube (CNT) composites are presented as analytical functions of volume fraction, anisotropic thermal conductivities, aspect ratio, nonstraightness, and interfacial thermal resistance of the CNTs. The model predictions agree very well with the measure…
The electronic structure and thermodynamic properties of $\mathrm{Ce}{\mathrm{O}}_{2}$ and ${\mathrm{Ce}}_{2}{\mathrm{O}}_{3}$ have been studied from first principles by the all-electron projector-augmented-wave (PAW) method, as implemented in the ab initio total-energy and molecular-dynamics program VASP (Vienna ab i…
We introduced single-charged molecules into layer-by-layer film of polymers by mixing polyelectrolyte and single-charged molecules with an appropriate ratio to form polymer complex and then deposition in alternation with counter-polyelectrolyte. By immersing the layer-by-layer film into aqueous solution of electrolyte…
Grafting of a new carbohydrate UV-reactive molecule, an azidophenyl lactamine (AzPhLac), was achieved on fibers of three different diameters: 12, 18, and 32 microm. Adsorption of AzPhLac on fibers was obtained by using the dip-coating method in solution. The effect of the solution concentration on surface density and…
Rings of single-walled carbon nanotubes (SWNTs) were assembled by dip-pen nanolithography (DPN) generated molecular templates consisting of COOH-terminated monolayers in circular patterns surrounded by passivating CH3-terminated SAMs. Experimental data and atomic-level Monte Carlo simulations show that SWNTs assemble…
Single crystals of the newly discovered borate YBa 3 B 9 O 18 with dimensions up to 13 × 8 × 4 mm 3 were successfully grown by the Czochralski pulling method. X-ray excited luminescence measurements of the YBa 3 B 9 O 18 showed a broad emission band in the wavelength range from 350 to 500 nm with a peak center at 400…
Synchrotron small-angle X-ray scattering (SAXS) was conducted on native intramuscular shad/herring bone samples. Two-dimensional SAXS patterns were quantitatively analyzed with special consideration for preferred orientation effects, leading to new insights into the three-dimensional superstructure of mineralized coll…
Large-area, high-uniformity, and high-density single wall carbon nanotubes (SWNTs) were fabricated by ethanol at 900 °C in a tubular furnace. The Fe(NO 3 ) 3 ·9H 2 O and the ICP/DCP standard solution of Mo were reacted to deposit SWNTs on the surface of the MgO sol−gel nanopowders. SWNTs have diameters in the range of…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAsymmetric Curvature of Growth Faces of Polymer CrystalsM. A. Shcherbina and G. UngarView Author Information Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, U.K. Cite this: Macromolecules 2007, 40, 3,…
Abstract The measurable emission color change resulting from size-dependent quenching of water-soluble CdTe quantum dots by molecular oxygen was observed experimentally. Particle size, capping ligands as well as pH is proven to govern this quenching process.
The surface characteristics of poly[2-(perfluorooctyl)ethyl acrylate] (PFOEA) films deposited using a high-pressure free meniscus coating (hFMC) process with liquid CO 2 (l-CO 2 ) as the coating solvent on 12.5 cm diameter silicon wafer substrates were investigated using contact angle measurements, atomic force micros…
High Resolution Image Download MS PowerPoint Slide Control of atomic-vacancy holes, which are the only pathways to internal hollow nanospaces, in walls of carbon nanostructures such as carbon nanotubes (CNTs) is crucial for material incorporation in and release from the nanospaces. We describe here a new approach to c…