Materials Literature
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The structural, microstructural, non-ohmic and dielectric properties of perovskite-type CaCu3Ti4O12 (CCTO) with Ca/Cu stoichiometries of 1/3, 1/1 and 3/1 are discussed. The 1/3 Ca/Cu ratio system presents very high dielectric permittivity (similar to 9000 at 10 kHz) and a low non-ohmic property (alpha = 9), whereas th…
Production implementation of premixed low-temperature diesel combustion (LTC) is highly attractive because it can lead to low engine-out particulate matter (PM) and NO x emissions. It is important for LTC strategies to yield acceptable emissions while consuming commercially available fuel, whose properties vary substa…
Abstract Two nitronyl nitroxide radical‐Tb III complexes, [Tb(hfac) 3 (NIT‐3Py)] 2 ( 1 ) and [Tb(hfac) 3 (NIT‐4Py)] 2 ( 2 ) {hfac = hexafluoroacetylacetonate; NIT‐3Py = 2‐(3′‐pyridyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl 3‐oxide; NIT‐4Py = 2‐(4′‐pyridyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl 3‐oxide} have been synthe…
We have performed transverse field muon spin rotation measurements of single crystals of $\text{Ba}{({\text{Fe}}_{0.926}{\text{Co}}_{0.074})}_{2}{\text{As}}_{2}$ with the applied magnetic field along the $\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{c}$ direction. Fourier transforms of the measured spectra reveal an anis…
Hydrogen-powered fuel cell vehicles feature high energy efficiency and minor environmental impact. Liquid fuels are ideal hydrogen carriers, which can catalytically be converted into syngas or hydrogen to power vehicles. Among the potential liquid fuels, alcohols have several advantages. The hydrogen/carbon ratio is h…
A growth model for the low pressure chemical vapor deposition (LPCVD) of polycrystalline ZnO thin films is proposed. This model is based on experimental observations of the surface morphology and crystallographic orientations of the layers at different thicknesses and growth temperatures. It is shown that the films pr…
Discovering new candidate p-type transparent conducting oxides has become a major goal for material scientists. Recently delafossite CuBO 2 has been proposed as a promising candidate, showing good room temperature electrical conductivity and excellent transparency [ Appl. Phys. Lett. 2007, 91, 092123]. In this article…
Nanocomposites, such as polymer blending with carbon nanotubes (CNTs), have been shown to have a drastic reduction in the resistivity and become conductive when the CNTs concentration has reached a certain percolation threshold. The reduction could be more than a millionth of the original polymer material. This has be…
We quantify the base dependent interactions between single stranded DNA and single walled carbon nanotubes (SWNTs) in solution. DNA/SWNT hybrids hold the promise of applications ranging from nanoscale electronics and assembly of nanotube based materials, to drug delivery and DNA sequencing. These applications require…
Synthesis of TiO 2 nanowires directly on conductive and transparent glass substrates would be very useful for various applications such as photovoltaics and photocatalysis. Here, we report for the first time that single-crystalline TiO 2 nanowires can be synthesized on fluorine-doped tin oxide (SnO 2:F)-coated soda-li…
Anaerobic biodegradation tests of poly(lactic acid) (PLA) powder were done at the thermophilic (55 degrees C) and mesophilic temperature (35 degrees C) under aquatic conditions [total solid concentrations of the used sludge were 2.07% (at 55 degrees C) and 2.24% (at 35 degrees C)] using a newly developed evaluation sy…
The ${\text{Au}}_{25}{(\text{SR})}_{18}^{\ensuremath{-}}$ cluster is a new member in the superatom family which features a centered icosahedral shell $({\text{Au}}_{13})$ protected by six $\text{RS}{(\text{AuSR})}_{2}$ motifs (RS\ensuremath{-} being an alkylthiolate group). Here we show that this superatom can be magn…
The discovery of novel family of molecular sieves called M41S aroused a worldwide resurgence in the field of porous materials. According to IUPAC definition inorganic solids that contain pores with diameter in the size range of 20-500 A are considered mesoporous materials. Mesoporous silica and alumina based materials…
Recent advances in supramolecular chemistry have had significant influence on the biomedical applications of materials chemistry. Supramolecular systems are based on weak and reversible non-covalent interactions, such as hydrogen bonding, metal coordination, hydrophobic attractions, van der Waals forces, π–π, and elec…
Cesium adsorption on 2x4 GaAs (001) was studied by photoemission and low energy electron diffraction. The different Cs induced changes of the As 3d and Ga 3d core level spectra show that charge transfer is almost complete for Ga surface sites, but is negligible to surface As at a coverage smaller than 0.3 ML. The situ…
This paper presents an assessment of continuum mechanics (beam and cylindrical shell) models in the prediction of critical buckling strains of axially loaded single-walled carbon nanotubes (SWCNTs). Molecular dynamics (MD) simulation results for SWCNTs with various aspect (length-to-diameter) ratios and diameters will…
Graphene is at the center of a significant research effort. Near-ballistic transport at room temperature and high mobility make it a potential material for nanoelectronics. Its electronic and mechanical properties are also ideal for micro and nanomechanical systems, thin-film transistors and transparent and conductive…
The precise atomic structure of the recently synthesized "magic cluster" Au(20)(SR)(16) is predicted using ab initio calculations and global-minimum searches. The cluster contains a prolate Au(8) core and four level-3 extended staple motifs (-RS-Au-RS-Au-RS-Au-RS-). The simulated optical absorption spectra of the lowe…
We present a theory for spin-polarized transport through a generic organic polymer connected to ferromagnetic leads with arbitrary angle theta between their magnetization directions, taking into account the polaron and bipolaron states as effective charge and spin carriers. Within a diffusive description of polaron-bi…
We report the observation of spin-glass-like behavior and strong magnetic anisotropy in extremely smooth (~1-3 Å) roughness) epitaxial (110) and (010) SrRuO3 thin films. The easy axis of magnetization is always perpendicular to the plane of the film (unidirectional) irrespective of crystallographic orientation. An att…