Materials Literature
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We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi2Ba2O4±ω]0.5CoO2, in a wide temperature range, as achieved through substituting up to 20% of Bi by Pb. The Pb substitution kept the thermal conductivity (κ) unchanged but decreased the electrical resistivity (ρ) and increased the…
Porphyrins with fluorenyl and fluorenone groups at the meso -positions, and their Zn(II) complexes have been synthesized and characterized by 1 H NMR, UV–visible and fluorescence studies. Following selective excitation of the pendant arms with UV light, the energy is transferred to the porphyrin core and reemitted as…
Double-walled carbon nanotubes (DWNTs) were synthesized used carbon black as the dot carbon source by a semi-continuous hydrogen arc discharge process. High-resolution transmission electron microscopy (HRTEM) observations revealed that most of the tubes were DWNTs with outer and inner diameters in the range of 2.67–4…
Isocitrate dehydrogenase (IDH) from the hyperthermophile Thermotoga maritima (TmIDH) catalyses NADP+- and metal-dependent oxidative decarboxylation of isocitrate to alpha-ketoglutarate. It belongs to the beta-decarboxylating dehydrogenase family and is the only hyperthermostable IDH identified within subfamily II. Fur…
The dependence on composition and loading direction of the strength of nanocrystalline α-Fe2O3+fcc-Al composites is analyzed using molecular dynamics simulations with a recently developed multicomponent interatomic potential. Compressive strength values are found to be higher than the tensile strength values at all vo…
Low-temperature plasmas of methane and oxygen mixtures were used to treat diamond nanoparticles to modify their surface characteristics and thus improve their dispersion capability in water. It was found that the plasma treatment significantly reduced water contact angle of diamond nanoparticles and thus rendered the…
We have grown epitaxial films of La0.67Sr0.33MnO3 (LSMO) and La0.67Ca0.33MnO3 (LCMO) on single crystalline LaAlO3 substrates by a cost effective polymer-assisted deposition technique. Film crystallinity, microstructure, resistivity, magnetization, and magnetoresistance (MR) were highly dependent on the annealing tempe…
Employing frequency-dependent dielectric susceptibility we characterize the aging in two supercooled liquids, sorbitol and xylitol, below their calorimetric glass transition temperatures. In addition to the alpha relaxation that tracks the structural dynamics, the susceptibility of both liquids possesses a secondary J…
It is shown that traces of 2,4,6-trinitrotoluene (TNT) display strong and distinct structures in differential reflectograms, near 420 and 250nm. These characteristic peaks are not observed from moth balls, nail polish, polyvinyl chloride, starch, soap, paper, epoxy, aspirin, polycarbonate, aspartame, polystyrene, poly…
We report on the enhancement of the mechanical properties of single wall carbon nanotube (SWNT)-polyvinyl alcohol (PVA) composites through functionalization of SWNTs with denatured collagen. In addition to improving compatibility with the matrix, the denatured collagen layer was found to increase the PVA matrix crysta…
Movements of ferroelastic 90° a -domains (twins) of sub-100 nm lateral size contribute greatly to the dielectric, piezoelectric, and elastic properties of ferroelectric materials. However, in thin films the mobility of twins is severely limited due to substrate clamping and pinning of domain walls. Here we demonstrate…
We report the magnetotransport properties of the heterojunction composed of La0.82Ca0.18MnO3 (LCMO) and 0.5wt% Nb-doped SrTiO3 (SNTO). At temperature below 120K, the heterojunction only exhibits a negative magnetoresistance (MR) independent of bias current. At temperatures above 120K, with increasing bias current a cr…
Emittance spectra of the MgAl 2 O 4 spinel have been obtained up to 2500 K. Spectral analysis using a dielectric function model recently developed for amorphous materials allowed us to retrieve the inversion parameter over a very wide temperature range. The results are very close to the most recent published values. B…
It is shown that the magnitude of photostructural changes in chalcogenide glass is a function of the connectivity and fragility of the glass network. Glasses with a floppy network undergo larger photostructural changes, as shown by photorelaxation, photoexpansion and photodarkening measurements. The increasing magnitu…
Recent experiments on polycrystalline Co1−xFexS2 demonstrated composition control over the spin polarization by Fermi level manipulation. We report here the growth and characterization of CoS2 single crystals with fine control over the stoichiometry by chemical vapor transport. At the ideal Co:S atomic ratio we observ…
Li 4 B N 3 H 10 has been synthesized recently from LiNH2∕LiBH4 mixtures and its crystal structure determined. We have calculated the electronic structure of this complex hydride and investigated its thermodynamic stability and decomposition energetics. We find that its enthalpy of formation is −708kJ∕mole with respect…
Simultaneous size and shape control of zinc selenide (ZnSe) nanostructures was achieved using lyotropic liquid crystal templates formed by the self-assembly of an amphiphilic block copolymer in the presence of water and a less polar organic solvent. ZnSe quantum dots, hollow nanospheres, nanotubes, and nanolaminates (…
This letter reports on a simple, easy method for generating suspended nanofibers on a dielectric substrate using various target electrodes. By controlling the electrostatic field between the target electrodes, the nanofibers can be oriented to the electric field direction at the electrodes. The alignment of nanofibers…
A theoretical and experimental study of magnetic metamaterials with unit cells containing two resonant elements is presented. The properties of these structures, consisting of split rings, are governed by strongly anisotropic magnetic coupling between individual elements. This coupling leads to propagation of slow mag…
Ab initio computational studies were performed for CdSe nanocrystals over a wide range of sizes and topologies. Substantial relaxations and coordination of surface atoms were found to play a crucial role in determining the nanocrystal stability and optical properties. While optimally (threefold) coordinated surface at…