Materials Literature
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We have prepared two complementary series of SubPc-C(60) (SubPc=subphthalocyanine) electron/energy donor-acceptor systems, in which the two constituents are linked through ortho-, meta-, or para-substituted phenoxy spacers. In one of the series (1 a) the SubPc units bear iodine atoms, while in the other series (1 b) d…
We have utilized surface-initiated polymerization (SIP) to functionalize the conducting transparent electrode, indium tin oxide (ITO) with polyvinylcarbazole (PVK) brushes. Atomic force microscopy (AFM) imaging revealed smooth domains of grafted PVK and the composition, confirmed by X-ray photoelectron spectroscopy (X…
Transparent p-type Mg doped CuCrO2 wide-band-gap oxide semiconductor thin films were deposited over quartz substrates by chemical spray technique using metallo-organic precursors. Crystalline single phase CuCrO2 delafossite structure was dominant in ≥700 °C argon ambient annealed films but the as-deposited films conta…
The optical properties of Ti2AlN and Ti2AlC were determined in the 2–80 eV energy range by electron energy loss spectroscopy and in the visible-ultraviolet range, from 1.6 to 5.5 eV, by spectroscopic ellipsometry. Both experimental techniques are angular resolved and in very good agreement over their overlapping energ…
La 1 − x Sr x CoO 3 has received considerable attention in bulk form. This is due to interest in the fundamental magnetic properties (spin-state transitions and magnetic phase separation) as well as potential applications in ferroelectric memory and solid-oxide fuel cells. The structure and properties in thin film for…
Porous oxide/PbS quantum dot photovoltaic devices like that shown in the figure have their IR power conversion efficiency drastically improved by annealing in air, opening up possibilities of efficient infrared energy harvesting.
Lead-free [(K0.458Na0.542)0.96Li0.04] (Nb1−xTax)O3 ceramics were prepared by ordinary sintering technique. The effects of Ta content on the phase transitional behavior, Raman spectrum, microstructure, and dielectric, piezoelectric, and ferroelectric properties of the ceramics were investigated. X-ray diffraction resul…
We demonstrate the effect of differently shaped CdSe nanoscale building blocks (dots, rods, branched nanoparticles, and hyperbranched nanoparticles) on the morphologies, surface characteristics, and optical properties of resultant porous CdSe nanostructured aerogels. Monolithic CdSe aerogels were produced by controlle…
Terpyridine thiol functionalized FePt and Au NPs were self-assembled and cross-linked at the liquid-liquid interfaces using Fe(II) metal ion. Complexation of terpyridine with Fe(II) metal ion leads to NP network and affords stable membranes and colloidal shells at the liquid-liquid interfaces.
The poling behavior of a lead-zirconate-titanate piezoelectric ceramic is investigated by measurements of the ferroelectric hysteresis, the longitudinal piezoelectric coefficient, and field-cooling poling experiments. At high temperatures, the decrease in the coercive field facilitates poling at lower electric fields,…
Abstract Freshwater carbonates (tufas) develop today from the Arctic to the tropics, many being localized about springs and upper water courses. Some Quaternary tufas, especially in the Mediterranean region, extend over tens of square kilometres and exceed 30 m in thickness. Radiometric dating of Holocene deposits sho…
Abstract Mollusk shell is one of the best studied of all calcium carbonate biominerals. Its silk‐like binder‐matrix protein plays a pivotal role during the formation of aragonite crystals in the nacre sheets. Here, we provide novel experimental insights into the interaction of mineral and protein compounds using a mod…
Complex cluster [TiO5⋅VOz] and [SrO11⋅VOz] (where VOz=VOX, VO•, VO••) vacancies were identified in disordered SrTiO3 powders prepared by the polymeric precursor method, based on experimental measurements by x-ray absorption near edge structure spectroscopy. The paramagnetic complex states of [TiO5⋅VO•] and [SrO11⋅VO•]…
A new hybrid organic inorganic assembly between an emulsifier, 4[12-(methacryloylamino)dodecanoylamino] benzenesulfonate acid (MADABS) and layered double hydroxide (LDH) of cation composition Zn 2 Al is described, as well as its subsequent dispersion into styrene. The characterization of the new hybrid LDH assembly by…
Building on recent statistical mechanical theories of segmental activated barrier hopping and elasticity in quiescent and stressed polymeric materials, we construct a constitutive equation description at a generalized Maxwell model level for the nonlinear mechanical response of polymer glasses. The key physics is cont…
The impact of physiological factors on silk fibroin solution properties was studied. Specifically, the impact of fibroin concentration, protein purity, cation type and concentration, and pH on aqueous solution viscosity, shear behavior, and surface tension were assessed in the context of silk protein assembly. The res…
QUALX is a new computer program for phase identification using powder diffraction data. It uses the Powder Diffraction File database, where a search for the phase best matching the experimental powder diffraction pattern is carried out. The program is characterized by a high level of automation: the traditional steps…
The crystallization behavior of strongly segregated diblock copolymers composed of polyethylene (PE) and poly( l -lactide) or racemic poly(lactide) (PLA) blocks has been investigated by differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and transmission el…
Computational techniques have been applied to study a broad range of chemical and physical properties of zinc oxide. Both interatomic-potential and density functional theory methods are used to investigate structural, thermodynamic, surface, and defect properties. We survey the structures and energies of nano-particul…
The bottleneck of micromagnetic simulations is the computation of the long-ranged magnetostatic fields. This can be tackled on regular N-node grids with Fast Fourier Transforms in time N logN, whereas the geometrically more versatile finite element methods (FEM) are bounded to N^4/3 in the best case. We report the imp…