Materials Literature
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Abstract Two copper-based alloys were considered, Cu-1 pct Cr and Cu-0.7 pct Cr-1 pct Si-2 pct Ni. The thermal, electrical, and mechanical properties of these alloys are given in the paper and compared to pure copper and steel. The role of aging and precipitation kinetics in hardening of the alloys is discussed based…
X-band electron spin resonance (ESR) measurements have been performed on a conducting free-standing film of polyaniline plasticized and protonated with di-n-dodecyl ester of sulfosuccinic acid (DDoESSA). The magnetic field was applied parallel and perpendicular to the plane of the film. At around 75 K a transition is…
Abstract In this study, hydrogenated amorphous silicon (a‐Si:H) single junction and amorphous/microcrystalline silicon tandem (a‐Si:H/µc‐Si:H) solar cells with different back‐reflectors (BRs) are systematically investigated. A novel white polyvinyl butyral (PVB) foil was used as BR. In addition, the specular aluminum…
We demonstrate the use of colloidal quantum dots (QDs) as refractive index signal amplifiers for the dual-mode, optical detection of biotin in streptavidin-functionalized porous silicon (PSi) biosensors. The nanoporous silicon host matrix was first analyzed to determine the relationship between different formation con…
A low contact resistance p-type electrode for nonpolar m-plane GaN was obtained using Mg as the electrode material. Ga atoms diffused toward the Mg electrode after heat treatment. Because the Ga vacancies act as acceptors and form levels in the Schottky barrier, we consider hopping conduction through the Ga vacancy le…
With the goal of developing a compact, high-resolution color camera, we have been studying about a novel image sensor with three stacked organic photoconductive films: each film is sensitive to only one of the primary color components, and each has a signal readout circuit. In this type of image sensor, the acceptable…
The use of an accelerometer as a gas detector in gas chromatography (GC) is described for the first time. A milli-whistle was connected to the outlet of the GC capillary. When the eluted and GC carrier gases pass through the capillary and milli-whistle, a sound is produced. After a fast Fourier transform (FFT), the so…
Abstract Disturbances in a dilute fibre suspension are studied with an Eulerian approach. Based on a linear stability analysis, it is shown that inertia and hydrodynamic diffusion damp perturbations at long wavelengths and short wavelengths, respectively, leading to a wavenumber selection. For small but finite Reynold…
Organic molecules from known biological sources (biomarkers) that are preserved over geological time are critical tools in the study of past conditions and events on earth. Polar molecules are typically recycled rapidly in marine environments and do not survive burial within aquatic sediments in unambiguously recogniz…
The synthesis of a series of co-oligomer amphiphiles by RAFT and their self-assembly behavior in water is described. These novel amphiphiles, comprised of styrene, butyl acrylate, and alkyl hydrophobes together with ionic acrylic acid and nonionic hydroxyethylacrylate hydrophilic moieties and with a total degree of po…
The structural origin of thermal instability of cathode materials, a critical safety issue for lithium-ion batteries, is studied systematically using a combination of various in situ synchrotron X-ray techniques and transmission electron microscopy. As Lijun Wu, Xiao-Qing Yang, and co-workers report on page 1047, an i…
Abstand zwischen Spins: Ein neuer frequenzselektiver Breitband-Inversionspuls wurde für die gepulste Elektron-Elektron-Doppelresonanz(PELDOR)-Spektroskopie entwickelt, mit der Abstandsverteilungen zwischen zwei oder mehr paramagnetischen Zentren im Abstand von 2–10 nm bestimmt werden können. Die PELDOR-Modulationstief…
The diluted magnetic semiconductor (Ga,Mn)As is investigated with respect to its damping behavior using frequency dependent ferromagnetic resonance techniques. In particular we investigate the homogeneity of the spin relaxation mechanisms from a submicrometer length scale to several millimeters using time-resolved sca…
Abstract A series of well‐defined three‐arm star poly(ε‐caprolactone)‐b‐poly(acrylic acid) copolymers having different block lengths were synthesized via the combination of ring‐opening polymerization (ROP) and atom transfer radical polymerization (ATRP). First, three‐arm star poly(ε‐caprolactone) (PCL) (Mn = 2490–783…
Abstract Transparent conducting polymer/n‐GaN Schottky junction was fabricated in order to study deep level defects of III–V nitride films under light irradation. The leakage current was as low as 10−6 A cm−2 at reverse bias of 10 V. The Schottky barrier height reaches 1.15 eV under dark condition and under normalized…
We investigate the electronic and magnetic properties of K(x)Fe(2-y)Se2 materials at different band fillings utilizing the multi-orbital Kotliar-Ruckenstein slave boson mean-field approach. We find that the ground state of KFe2Se2 is a paramagnetic (PM) bad metal with intermediate correlation, in contrast with the pre…
Collagen is the major fibrous protein in the extracellular matrix and consists a significant component of skin, bone, cartilage and tendon. Due to its unique properties, it has been widely used as scaffold or culture substrate for tissue regeneration or/and cell-substrate interaction studies. The ultraviolet light-col…
Abstract We report high‐resolution measurements of the in‐plane thermal expansion anisotropy in the vicinity of the electronic nematic phase in Sr3Ru2O7 down to very low temperatures and in varying magnetic field orientation. For fields applied along the c‐direction, a clear second‐order phase transition is found at t…
Considering calculations of the molecular electrostatic potential at the atomic sites (MEP@AS) in the presence of effective core potentials (ECP), we found that the consequent use of the definition of MEP@AS based on the energy derivative with respect to nuclear charge leads to a formula that differs by one term from…
Three new B-Anderson type polyoxometalates, [(C6H5NO2)2Ln(H2O)6](CrMo6O24H6)·2C6H5NO2·6H2O (Ln = Sm 1, Dy 2 and Er 3), have been synthesized in aqueous solution and structurally characterized by single-crystal X-ray diffraction, IR spectra, UV spectroscopy, and fluorescence spectroscopy. Crystal structure analysis rev…