Materials Literature
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Abstract Quercetin is an abundant flavonoid in food plants with numerous biological activities and widely used as a potent antioxidant. Being sparingly soluble in water and subject to degradation in aqueous intestinal fluids, the absorption of quercetin is limited upon oral administration. In the present study, chitos…
Noncoherent low-power photon upconversion has been realized in solid thin films composed of an ethyleneoxide/epichlorohydrin copolymer doped with palladium octaethylporphyrin (PdOEP) and 9,10-diphenylanthracene (DPA). Selective excitation of PdOEP at 544 nm generates easily visualized DPA fluorescence in the blue with…
Selektiv entfernt: Alkyl- und Phenylgruppen wurden im Zwischenschichtraum eines Titanats immobilisiert, um selektiv und effektiv 4-Nonylphenol (NPh, in hellen Farben) aus wässriger Lösung zu adsorbieren. Die Immobilisierung zweier Arten funktioneller Einheiten in einem Nanoraum ist ein geschickter Weg zu maßgeschneide…
Porous silicon is an excellent material for biosensing because of its large surface area and ability to filter out large contaminant species. In order to characterize the sensitivity of porous silicon based biosensors for biomolecules of different sizes, a mesoporous silicon waveguide with average pore diameter of 20…
Raman and infrared reflectance spectra of single-crystal lead tetraborate (PbB 4 O 7 :PTB) have been recorded. Using a first-principles calculation, the phonon dispersion relation of PTB has been derived within the local density approximation. A symmetry analysis of the phonon modes at the centre of Brillouin zone was…
The space groups of Sr 1− x Ca x TiO 3 in the composition range 0.20≤ x ≤0.30 have been investigated using powder x-ray diffraction (XRD) and electron diffraction techniques. Electron diffraction has been used in selected area diffraction (SAD), convergent beam electron diffraction (CBED) and micro-diffraction modes t…
We propose a novel design for a guided-mode resonance (GMR) grating sensor that extends the sensitivity to a large region of space, possibly several tens of microns away from the grating surface. This type of sensors has high sensitivity in the half-space above the grating, close to the theoretical limit, together wit…
The glass transition phenomena are observed in many different classes of materials and have been studied in various disciplines. It is a long‐standing problem due to the increasing number of important and general experimental facts that challenge conventional theories to explain. A collection of such experimental fact…
Pore boundary tessellation and quantitative stereology were used to characterize microstructure evolution in ZrO 2 –3 mol%Y 2 O 3 (3YSZ) that had been pressed to a green density of 46% and isothermally sintered at 1275°C for 0.1–10 h. Scanning electron micrographs showed that, relative to classical sintering models, t…
The stacking structures of sudoite, di-trioctahedral chlorite from two different localities are investigated by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). XRD analyses using a Gandolfi camera revealed that the structures of both specimens are similar, corresponding to…
LaBO 3 bundle‐like nanorods are self‐assembled through a novel oxide‐hydrothermal method. In this route, the stoichiometric amounts of La 2 O 3 and boric oxide B 2 O 3 are mixed in proper amounts of water in a surfactant/ligand‐free sealed hydrothermal system. The nanobundles are de‐agglomerated to nanorods by tiny Sm…
Abstract In this paper we make a detailed comparison of the thermoelectric properties of quantum dot superlattices with those of equivalently doped bulk material and show that a major contribution to the enhancement of the figure of merit comes from the increase of the thermoelectric power over that of bulk, in additi…
A novel sandwich-type supercomplex, namely {[Er(TETA)]2Er(H2O)8}NO3·10H2O (1), has been self-assembled through the conjoined hydrogen bonds by using a tetraaza-functionalized macrocyclic polyamine ligand, showing complete incorporation of the octahydrate lanthanide cation between the second coordination spheres.
Abstract A novel plasma‐polymerized 1‐cyanoisoquinoline (PPCIQ) thin film of desired thickness was prepared by plasma polymerization under different glow discharge conditions. The effect of the discharge power on the chemical structure, surface composition and morphology of the PPCIQ thin films were investigated by Fo…
In this work, the film thickness (l0) effect on the phase and dewetting behaviors of the blend film of poly(methyl methacrylate)/poly(styrene-ran-acrylonitrile) (PMMA/SAN) has been studied by in situ atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The thinner film shows the more compatibility…
Single‐crystal α‐alumina (Al 2 O 3 ) hexagonal platelets with a diameter of about 200 nm and 25 nm in thickness were synthesized by heating a mixture of boehmite and potassium sulfate at 1000°C for 2 h and washing with water. The potassium sulfate addition effects on the Al 2 O 3 phase and morphology were investigated…
Thermodynamic calculations of ion-exchange reactions were applied for clinoptilolite in a natural state and after irradiation with three doses of β-radiation (10 12 , 10 15 , 3 × 10 16 e/cm 2 ) and γ-radiation (70 Mrad). Samples were equilibrated with binary systems of K + ↔ Na + and Cs + ↔ Na + at 25° and a total nor…
The crystal structure of the dimeric O-acetylserine sulfhydrylase isozyme B from Escherichia coli (CysM), complexed with the substrate analog citrate, has been determined at 1.33 A resolution by X-ray diffraction analysis. The C1-carboxylate of citrate was bound at the carboxylate position of O-acetylserine, whereas t…
High‐purity aluminum foil was used to join alumina substrates directly in air at temperatures ranging from 800° to 1200°C and soak times of 1–100 h. It was found that the bend strengths of the resulting Al 2 O 3 /Al/Al 2 O 3 joints generally increase with increasing brazing temperature and time, with a maximum bend st…
Highly reactive and nanocrystalline powders of LaCrO 3 based compositions, having the general formula La 0.9 Ca 0.1 Cr 1− x M x O 3−δ (0≤ x ≤0.1, and M=Al, Co, or Mg), suitable for solid‐oxide fuel cell (SOFC) applications, have been synthesized using an auto‐combustion technique with ammonium dichromate as the chromi…