Materials Literature
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Nonstoichiometries of and transport properties of were investigated. At , transformed to CaO and CoO. The reaction products offer a precise baseline for thermogravimetric analysis. At room temperature, δ in is 0.38, which decreases at , indicating the onset point of the formation of oxygen vacancies, and δ is at . Cor…
Self-assembling functionalized multi/single-walled carbon nanotubes (MWCNTs/SWCNTs) in a controlled manner may be an interesting route towards novel nanoscaled supramolecularly arranged MWCNT/SWCNT-based architectures as sensing constructs. Due to the presence of fullerene-like end-caps sensitive to oxidation, the oxi…
Abstract Oppositely charged polyelectrolyte (poly(allyamine hydrochloride) (PAH) and poly(sodium 4‐styrene‐sulfonate) (PSS)), and negatively charged gold nanoparticles (Au) were assembled alternately on polystyrene (PS) spheres via layer‐by‐layer technique, and the different PAH/(PSS/PAH) n /(Au/PAH) m /Au composite h…
A rapid thermal annealing process using a DC vacuum arc discharge system was shown to reduce defects in carbon nanotubes (CNTs). Multi-walled CNTs (MWCNTs) exhibit high-density structural imperfections when deposited via chemical vapour deposition at relatively low temperatures (∼650°C). These defects can be thermally…
Abstract ZnO nanostructures composed of nanosheets have been synthesized by a facile low temperature reaction of Zn(OH) 2 and NaOH without the aid of any organic molecular templates. The influences of the reaction parameters, such as the concentrations of Zn(NO 3 ) 2 , reaction temperatures, and reaction time on the m…
In natural diamonds a sulfur-related paramagnetic center labeled W31 has been previously tentatively assigned to an interstitial sulfur species in a positive charge state. However, we show by combining an assessment of available experimental data and density-functional simulations that the hyperfine tensors can be att…
Abstract Low lattice‐mismatched γ‐LiAlO 2 (100) substrates were employed to grow ZnO epitaxial films by chemical vapor deposition. The influence of growth temperature on growth behavior of ZnO was investigated. Results indicated that the low lattice‐matched (10 $ \bar 1 $ 0) crystallites nucleate on substrate at all g…
The primary mission of the Army is to fight and win the Nation's wars. Conducting offensive and defensive operations has long been the Army's core capability. However, the recent experience of operations in the Balkans, Iraq, and Afghanistan, coupled with today's operational environments, clearly indicates that the fu…
The Ni/SiO2 composite microcapsules were prepared by a one-pot synthesis via thermally decomposing Ni(acac)2·2H2O in 2-pyrrolidone in the presence of tetraethyloxysilane and 3-aminopropyltrimethoxysilane (APS). Transmission electron microscopy and powder X-ray diffraction were used to characterize the general morpholo…
Abstract Aufgerollt wie ein Teppich : Durch Anbringen flexibler Knäuel an den Mittelteil starrer stabförmiger Moleküle entstehen T‐förmige Stab‐Knäuel‐Konstrukte, die selbstorganisierte Schichten aufbauen. Diese Schichten rollen sich auf, sodass im Festkörper, je nach Größe der Knäuel, ausgefüllte Zylinder oder hohle…
A composite film fabricated by plasma treated poly(etherimide) with subsequent deposition of gold nanoparticles and lysine using layer by layer assembly has been demonstrated to be good for cell attachment and proliferation making it an attractive strategy for tissue engineering applications. As compared to the other…
The electronic states of zinc magnesium oxide (Zn 1− x Mg x )O thin films were determined exactly by hard X-ray photoemission spectroscopy (HX-PES) using synchrotron radiation. The Zn 2p core level was shifted to a higher binding energy along with widening of the bandgap by alloying with MgO, whereas the shift of the…
Different chemical states of titanium oxide films were deposited on commercially pure Ti (CP Ti) by electron-beam evaporation at different oxygen flow rates to examine a possibility of their applications to endovascular stents. The surface morphology, chemical composition and crystal structure of the obtained titanium…
A general method for the functionalization of silica surfaces with silicon hydride (Si-H) groups is described for four different preparations of silica. The silica surface is reduced in a two-step chlorination-reduction procedure within a simple gas-flow system at high temperatures. After initial dehydroxylation of th…
Nanostructured porous silicon (PS) is usually formed by anodic etching in HF-based solution, and its porosity is measured by a destructive gravimetric technique. In this article, we report the development of an artificial neural network (ANN)-based model permitting in situ prediction of porosity of PS samples. The sen…
Structure solution from powder diffraction data, from either real- or reciprocal-space methods, has generally been thought to require reliable relative intensities to yield a successful solution. An approach is described here which requires no input of the orientation direction when using simulated annealing. The simp…
The feasibility of a Ni∕YSZ (yttria-stabilized zirconia) anode infiltrated with a perovskite-type proton conductor, (SZY), was investigated for use in solid oxide fuel cells. The electrochemical characteristics of the Ni∕YSZ–SZY anode and the Ni∕YSZ anode were examined for humidified hydrogen fuel and for dry methane…
Abstract The photoluminescence properties of silicon quantum dots may be tailored by surface states via efficient coupling to resonant bulk states. Therefore various wet‐chemistry procedures were developed to fabricate silicon quantum dots with adjustable sizes and surface properties. While the energy gap of the Si co…
The detailed T(c)-sensitive crystal pattern transition from dendrites through fourfold-symmetric structures to faceted crystals of ultrathin poly(ethylene oxide) films has been experimentally observed using atomic force microscopy. The transition has been quantitatively described by the T(c)-dependences of the fractal…
Novel chromophores based on the alternation of electron-poor (pyridyl) and electron-rich (ethylenedioxythienyl) heterocycles were synthesized for the first time and shown to exhibit attractive optical properties in relation with their specific electronic and geometrical (coiled structure) features.