Materials Literature
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Piezoelectric properties of Na 0.5 Bi 0.5 TiO 3 ceramics have been investigated over a broad temperature range using a resonance technique. The thermal behaviours of the piezoelectric tensor coefficients d 31 , d 33 and d 15 confirm that there is a distinct phase transformation at 200 °C. For the first time it has bee…
Silver dendritic nanostructures protected by tetrathiafulvalene (TTF) were synthesized via reduction of silver ions with TTF in acetonitrile.
We introduce a generic Fröhlich-Coulomb model of the oxides, which also includes infinite on-site (Hubbard) repulsion, and describe a simple analytical method of solving the multi-polaron problem in complex lattice structures. Two particular lattices, a zigzag ladder and a perovskite layer, are studied. We find that,…
Controlled synthesis of transition metal complexes with mixed ligands has led to two new compounds with the same empirical formula [Fe(N3)2(4,4'-bpy)] (4,4'-bpy=4,4'- bipyridine). The compound 2D-[Fe(N3)2(4,4'-bpy)] (I) contains end-on (EO) bridging azido ligands. It crystallizes in the orthorhombic crystal system, sp…
We report the first use of ultrafast (subpicosecond) laser pulses for large-scale production of single wall carbon nanotubes (SWNT's) by the pulsed laser vaporization (PLV) technique. Very high production rates were achieved; using only 20% of the nominal average power of the 1 kW Jefferson Lab free electron laser (Jl…
In this study, we use a novel method for simultaneously measuring the optical and electrochemical properties of layer-by-layer self-assembled conducting ultrathin polymer films. We employed the recently developed combination of in situ surface plasmon resonance spectroscopy (SPS) and surface plasmon field-enhanced lig…
Solid and hollow metallo-dielectric spheres are created by layer-by-layer self-assembly. The discrete metallic nanoparticles, which make up the shell, form a contiguous layer that exhibits a collective plasmon resonance with a splitting of the dipole mode into transverse and longitudinal modes. The splitting can be co…
Progress reports are a new type of article in Advanced Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated, and…
Polyimides with a combination of properties including low solar absorptivity (α) in thin films, atomic oxygen (AO), and ultraviolet (UV) radiation resistance, solubility in organic solvents in the imide form, high glass transition ( T g ) temperatures, and high thermal stability have been prepared and characterized. T…
Selective, sensitive cation capture: A bichromophoric “H”-foldamer (rigid-flexible-rigid) demonstrates a cation-steered exciton interaction (see figure; the interaction is denoted by the double-headed arrow) and thereby allows the selective signaling of Ca2+-ion binding among Na+, K+, and Mg2+ ions. The binding can be…
The effect of nanoscopic particles on the mesophase structure of diblock copolymers was discussed. The parameters of phase diagram were calculated using the segregation scaling theory (SST) as a function of the particle interaction parameters for the entire range of the diblock compositions. The results showed that th…
A major challenge for the study of the magnetically shape-controlled memory alloys Ni-Mn-Ga is the structural search for their variants. We report studies of the variants of Ni 2 MnGa alloys from a theoretical point of view by means of density functional calculations using the generalized gradient approximation. The e…
Discotic liquid crystals have emerged as very attractive organic semiconductors due to their high degree of ordering and self-healing capacity. Quantum-chemical calculations that describe the main parameters governing the charge-transfer processes in these systems at the molecular level are reported. The concepts are…
The optical and redox properties of a series of 3,4-ethylenedioxythiophene oligomers (EDOTn, n=1-4) and their beta,beta'-unsubstituted analogues (Tn, n=1-4) are described. Both series are end capped with phenyl groups to prevent irreversible alpha-coupling reactions during oxidative doping. Absorption and fluorescence…
A crosslinked cholesteric network doped with a fluorescent dye exhibits lasing efficiencies that are more than one order of magnitude higher than those of a low molar mass cholesteric liquid crystal (CLC) with similar optical parameters. The emission from the samples has been found to be stable, whereby the lasing thr…
We propose a model Hamiltonian for describing charge transport through short homogeneous double stranded DNA molecules. We show that the hybridization of the overlapping pi orbitals in the base-pair stack coupled to the backbone is sufficient to predict the existence of a gap in the nonequilibrium current-voltage char…
We have examined a method of direct extraction of accurate tight-binding parameters from an ab-initio band-structure calculation. The linear muffin-tin potential method, in its full-potential implementation, has been used to provide the hamiltonian and overlap matrix elements in the momentum space. These matrix elemen…
The effect of random surface roughness on hydrodynamics of viscous incompressible liquid is discussed. Roughness-driven contributions to hydrodynamic flows, energy dissipation, and friction force are calculated in a wide range of parameters. When the hydrodynamic decay length (the viscous wave penetration depth) is la…
A synthesis of beta-Co(OH)2 nanocrystalline materials has been investigated with the assistance of chelating agent ethylenediamine. By controlling precipitation processes, various forms of beta-Co(OH)2 crystallites can be prepared at different stages. The crystallite morphologies include two-dimensional hexagonal shee…
The influence of contacts on linear transport through a molecular wire attached to mesoscopic tubule leads is studied. It is shown that low dimensional leads, such as carbon nanotubes, in contrast to bulky electrodes, strongly affect transport properties. By focusing on the specificity of the lead-wire contact, we sho…