Materials Literature
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Controlled hydrolysis of a (beta-diketiminate)calcium-amide gave a heteroleptic (beta-diketiminate)calcium-hydroxide complex that is remarkably stable against ligand exchange and formation of Ca(OH)2. The structure of this dimeric complex shows OH- units that symmetrically bridge the Ca2+ ions. This hydrocarbon-solubl…
We studied the pressure dependence of the room-temperature infrared reflectivity of ${(\mathrm{TMTTF})}_{2}\mathrm{As}{\mathrm{F}}_{6}$ along all three optical axes. This anisotropic organic compound consists of molecular stacks with orbital overlap along the $a$ direction; due to electronic correlations the system is…
Ionic transport in nanostructured solid electrolytes is investigated using an atomistic model that clarifies the enhanced conductivity (see figure) of these materials. It is based on the fast diffusion of free oxygen vacancies through the grain boundaries. A transition observed in the ionic conductivity of the nanocer…
We describe the dielectric effects in a novel branched phthalocyanine system. The synthesis and characterization of the hyperbranched structure are provided. The dielectric constant was approximately 45 over many decades of frequency, and the dispersion was small up to 1 MHz. The losses experienced in this novel mater…
Abstract Mesoporous silica nanofibers with longitudinal pore channels are synthesized in high yields using cetyltrimethylammonium bromide as the structure‐directing agent in hydrobromic acid solutions. These nanofibers are used as templates to prepare gold nanoparticles along the fiber axis. For the gold‐precursor‐loa…
Pod people: Tetrapod-shaped ZnTe/CdSe and ZnTe/CdS heterostructure nanocrystals (see image, left and right, respectively) are prepared by a novel synthetic route. The tetrapod arms are grown on the ZnTe cores by alternating injections of Cd and Se/S precursors at intermediate temperatures in the presence of oleylamine…
Although much effort has been extended to the efficient cancer therapies, the drug resistance is still a major obstacle in cancer chemotherapeutic treatments. Almost 90% of the cancer therapy failure is caused by the relative problems. Recently, the application of drug coated polymer nanospheres and nanoparticles to i…
Charge detection biosensors have recently become the focal point of biosensor research, especially field-effect-transistors (FETs) that combine compactness, low cost, high input, and low output impedances, to realize simple and stable in vivo diagnostic systems. However, critical evaluation of the possibility and limi…
We report fluorescence blinking statistics measured from single CdSe nanorods (NRs) of seven different sizes with aspect ratios ranging from 3 to 11. This study also included core/shell CdSe/ZnSe NRs and core NRs with two different surface ligands producing different degrees of surface passivation. We compare the find…
The dispersion of an efficient secondary chromophore into in situ crosslinked nonlinear optical polymer networks is described. The secondary chromophore leads to both enhanced electro-optical (EO) activity (> 260 pm V–1 at 1.31 μm) and alignment stability at 85 °C. Analysis of the EO properties shows exceptional polin…
We review the role of strong electronic correlations in quasi-two-dimensional organic charge transfer salts such as (BEDT-TTF) 2 X, (BETS) 2 Y, and β′-[Pd(dmit) 2 ] 2 Z. We begin by defining minimal models for these materials. It is necessary to identify two classes of material: the first class is strongly dimerized a…
The dispersion relation for plane waves in uniaxial metamaterials with indefinite dielectric tensors and scalar positive permeability is theoretically investigated. It is found, that the isofrequency surfaces of the plane extraordinary waves have a hyperbolic shape which allows the propagation of waves with infinitely…
To address the future use of alloying elements for Cu interconnect applications in integrated circuits, first, available bulk experimental data such as residual resistivity per at. % solute and binary phase diagrams are used to arrive at a set of 24 potential elements. Next, experimental results in thin films and line…
Density functional theory was employed to calculate the adsorption/dissociation of H2 on gold surfaces, Au(111) and Au(100), and on gold particles from 0.7 (Au14) to 1.2 nm (Au29). Flat surfaces of the bulk metal were not active towards H2, but a different effect was observed in gold nanoclusters, where the hydrogen w…
The magnetic properties of cobalt ferrite-silica nanocomposites with different concentrations (15, 30, and 50 wt %) and sizes (7, 16, and 28 nm) of ferrite particles have been studied by static magnetization measurements and Mossbauer spectroscopy. The results indicate a superparamagnetic behavior of the nanoparticles…
The quantum-dynamical mechanism of photoinduced subpicosecond exciton dissociation and the concomitant formation of a charge-separated state at a TFB:F8BT polymer heterojunction is elucidated. The analysis is based upon a two-state vibronic coupling Hamiltonian including an explicit 24-mode representation of a phonon…
Measurements of the low-frequency $(f\ensuremath{\le}100\phantom{\rule{0.3em}{0ex}}\mathrm{kHz})$ permittivity at $T\ensuremath{\lesssim}160\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and dc resistivity $(T\ensuremath{\lesssim}430\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ are reported for ${\mathrm{La}}_{1\ensuremath{-}x}{\ma…
The thermoelectric power (TEP) measurements have been carried out to investigate the changes in the electronic structure associated with the intermartensitic and martensitic transitions in Ni$_{2+x}$Mn$_{1-x}$Ga (0 $\le$ x $\le$ 0.19). The samples have been characterized by a.c. magnetic susceptibility measurements. T…
Microstructure and electrical properties of manganese oxide (MnO)‐doped (Na 0.5 Bi 0.5 ) 0.92 Ba 0.08 TiO 3 (NBBT) piezoceramics were investigated in this work. X‐ray diffraction analysis shows that the suitable substitution of Mn ion into the B site induces the lattice distortion of perovskite NBBT: the solution limi…
Abstract Poly(vinyl alcohol) (PVA) was blended with 10, 20, 30, 40, and 50 wt % of starch with and without crosslinking by solution casting process. The solution‐casted films were dried and tested for physicomechanical properties like tensile strength, tensile elongation, tensile modulus, tear and burst strengths, den…