Materials Literature
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Uncooled amorphous silicon microbolometers have been established as a field-worthy technology for a broad range of applications where performance and form factor are paramount, such as soldier-borne systems. Recent developments in both bolometer materials and pixel design at L-3 in the 17μm pixel node have further…
Although widely recognized as a powerful tool to explore the influence of nonlocal interactions in crystals, reciprocal-space cluster expansions, in their most popular ``mixed-basis'' (MBCE) formulation, still suffer from restrictions severely limiting their application to complex crystallographies and multisite unit…
Time-resolved X-ray absorption-fine structure (Quick-XAFS) and UV–Vis absorption spectroscopies were combined for monitoring simultaneously the time evolution of Zn-based species and ZnO quantum dot (Qdot) formation and growth during the sol–gel synthesis from zinc oxy-acetate precursor solution. The time evolution of…
Abstract Poly(l-phenyllactic acid)s (PlPhLAs) with high molecular weight were prepared by a direct polycondensation of l-phenyllactic acid in the presence of stable Lewis acids such as HfCl4·2THF under various reaction conditions. As a result, PlPhLAs with a number-average molecular weight (Mn) more than 100000 g mol−…
Abstract A three-dimensional chiral-structured molecular magnet based on a Co–W bimetal assembly, [CoII(H2O)2][CoII(pyrimidine){(R)-1-(4-pyridyl)ethanol)}]2[WV(CN)8]2·7.5H2O, is synthesized. This compound exhibits a spontaneous magnetization due to ferromagnetic ordering between CoII (S = 3/2) and WV (S = 1/2) with a…
The first example of a macrocyclic ferrous complex, where two tetrazolyl pendent arms compensate the charge of the metal center, is synthesized and examined for its capacity to enhance MRI contrast in vitro and in vivo in the mouse.
This paper provides an overview of the recent DRS RSTA, Inc. (DRS) Vanadium Oxide (VOx) uncooled focal plane arrays (UFPA), sensor electronics, and camera development activities. Presently, DRS UFPAs consist of 25 μm and 17 μm pixel pitch detectors in 320x240 and 640x480 formats. Under the Army NVESD sponsored 1…
Physical properties of chalcogenide glass, including broadband infrared transparency, high refractive index, low glass transition temperature, and nonlinear properties, make them attractive candidates for advanced mid-infrared (3 to 12 μm) optical designs. Efforts focused at developing new chalcogenide glass formul…
Obtaining information about the intrinsic structure of polycrystalline materials is of prime importance owing to the anisotropic behaviour of individual crystallites. Grain orientation and its statistical distribution, i.e. the texture, have an important influence on the material properties. Crystallographic orientati…
The stress-invariance problem for a chiral (non-centrosymmetric) micropolar material model is explored in two different planar problems: the in-plane and the anti-plane problems. This material model grasps direct coupling between the Cauchy-type and Cosserat-type (or micropolar) effects in Hooke's law. An identical st…
Two new titania-based nanostructures—namely, hexagonally packed titania hoops (HTHs) and modified large compound vesicles (LCVs)—were created in polystyrene- b -poly(ethylene oxide) (PS- b -PEO)/titania microspheres by coupling self-assembly of the asymmetric amphiphilic block copolymers in selective solvents with the…
Crystallization is a commonly used purification process in industrial practice. It usually begins with heterogeneous nucleation on a foreign surface. The complicated mechanism of heterogeneous nucleation is not well understood, but we hypothesize that a possible correlation between binding affinity to a surface and nu…
Abstract Ultrafast demagnetization upon excitation with intense laser pulses has been observed for a variety of ferromagnetic materials. In half‐metals, long demagnetization times are expected due to the band gap for one spin direction. We have investigated the theoretically half‐metallic Heusler alloy Co 2 Cr 0.6 Fe…
We report both $^{77}\mathrm{Se}$ and $^{87}\mathrm{Rb}$ nuclear magnetic resonance (NMR) studies on Tl${}_{0.47}$Rb${}_{0.34}$Fe${}_{1.63}$Se${}_{2}$ single-crystalline superconductors (${T}_{c}\ensuremath{\approx}$ 32 K). Singlet superconductivity is suggested by a sharp drop of the Knight shift $K(T)$ below ${T}_{c…
A uniform Si-O coating on cotton fabric was produced at atmospheric pressure by a plasma treatment. Before the plasma discharge, a pretreatment with hexamethyldisiloxane (HMDSO)-ethanol mixture solvents on the fabric was employed. The surface morphology and chemical structure of the plasma-treated fibers were analyzed…
Abstract Heterogeneous catalysis and functional surfaces are intimately connected. Surface functionalities mediate the catalytic reactions. However, the surface must fulfil several requirements: adsorption of the reactants on the surface must be energetically favoured (but reversible), the surface functionalities must…
A layer-by-layer methodology was used for synthesizing CeO 2 /TiO 2 and TiO 2 /CeO 2 core–shell nanoparticles supported in Vycor glass pores. The layers were deposited by cerium- or titanium-based metalloorganic precursor decomposition. Sequential depositions promoted linear mass increases of the Vycor pieces and a li…
The magnetic susceptibilities, electrical resistivities, Hall coefficients, and Seebeck coefficients have been measured for single crystals of a narrow-gap semiconductor of FeSb 2 prepared using Sb metals of different purities. Below 40 K, carriers supplied from impurities of the Sb metal used as the raw material dete…
Like all spiders, tarantulas (family Theraphosidae) synthesize silk in specialized glands and extrude it from spinnerets on their abdomen. In one species of large tarantula, Aphonopelma seemanni, it has been suggested that silk can also be secreted from the tarsi but this claim was later refuted. We provide evidence o…
Abstract In this article, one cast technique to fabricate 20–40 wt %AgNO 3 ‐doped polyvinyl alcohol (PVA) composite films of which electrical resistance sharply dropped (4–5 order) in a certain temperature range was reported. The phase, structure thermal, and electrical resistivity properties of films at different hea…