Materials Literature
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This paper discusses the poly-beta-hydroxybutyrate (PHB) metabolism in aerobic, slow growing, activated sludge cultures, based on experimental data and on a metabolic model. The dynamic conditions which occur in activated sludge processes were simulated in a 2-L sequencing batch reactor (SBR) by subjecting a mixed mic…
Titania/silica gels covered by a carbon layer using pyrolysis of cyclohexene at 973 K and containing different amounts of titania ( C TiO 2 ) and carbon deposit ( C C ) have been studied by means of pyrolysis kinetics, nitrogen adsorption/desorption, TEM, IR spectroscopy, differential thermogravimetry, and theoretical…
Schematic of the Cu2O/PbS semiconductor heterojunction on Au (100) showing the epitaxial relations between the layers. The 0.5-μm-thick PbS and Cu2O films were consecutively electrodeposited onto a Au(100) single crystal at room temperature. Both layers showed a strong (100) out-of-plane texture. Azimuthal X-ray diffr…
Latex with very low glass transition temperature ( T g ) polymers forms a continuous film on drying. The physical and mechanical properties of the film are dependent on the extent the latex particles are able to coalesce and fuse into each other. Any hindrance to the film formation process would result in a poorly for…
Rh surface states and their adsorbates during the NO−CO reaction have been characterized by the in situ infrared (IR) coupled with temperature-programmed reaction (TPR) technique. The TPR profiles of adsorbates and CO 2 show that Rh surface states and their adsorbates are governed by the redox reaction cycle of NO−CO.…
This paper presents the first step in developing a tool which would be able to predict the breakdown voltage of air insulation under a positive switching impulse. The discharge model uses a map of the Laplacian potential and the electric field computed by an electric field software. The model is based on the previous…
The mutual diffusion of poly(styrene- b -2-vinylpyridine) (PS−PVP) diblock copolymer and PVP-PS-PVP triblock copolymer with polystyrene (PS) homopolymer is measured using secondary ion mass spectrometry. The depth profile of the PVP block in bilayers of PS/PS-PVP films after annealing shows a unique diffusive behavior…
The synthesis, characterization, and mesomorphic properties of new discotic molecules based on the triazolephthalocyanine macrocycle are described. This core has been attached to six lipophilic chains, and metallic complexes (Ni, Cu) have been prepared. The mesogenic behavior has been studied using optical microscopy,…
Thermoluminescence (TL) and radio-thermoluminescence spectral analysis techniques have been applied to doped calcium sulphate samples designed for radiation measurements at elevated temperatures. CaSO 4 :Dy, when co-doped with Ag, provides a TL dosimetric peak near 350 °C which is useful for radiation measurements at…
A new one-dimensional gallium phosphate−diphosphate, [C 2 H 10 N 2 ][Ga(H 2 PO 4 )(P 2 O 7 )], has been synthesized under solvothermal conditions at 433 K in the presence of ethylenediamine, and the structure was determined using room-temperature single-crystal X-ray diffraction data ( M r = 402.76, monoclinic, space…
Die Kontrolle über die Selbstorganisation von Cobaltporphyrin-Polymeren lässt sich durch Gelchromatographie prüfen: Die Polymere bilden sich aus Cobaltporphyrinen, die mit zwei potentiell koordinierenden Pyridinarmen versehen sind; die Molekülmassen in Lösung betragen 100 kDa und mehr. Die mittlere Molekülmasse lässt…
The acidic lactonization and alkaline hydrolysis of the title compound, a model for biologically important polyneuraminic acid derivatives, were investigated. The results indicate that initial lactonization takes place mostly at the internal position B en route to the trilactone 1.
Der Unterschied in den Relaxationsgeschwindigkeiten von Wasserprotonen wird durch ein Kontrastreagens für die Magnetresonanz-Bildgebung (magnetic resonance imaging, MRI) verstärkt: Die Oxidation der Manganzentren im supramolekularen Addukt aus Poly-β-cyclodextrin (PolyβCD) und [MnII(tpps)]4− führt zu einer deutlichen…
Highly conductive hybrid Langmuir−Blodgett (LB) films of MoS 2 and amphiphilic compounds such as alkylammonium halides and alkylamines were fabricated. The interlayer spacing of the LB films depended on the organic species. The lateral conductivity of 10-layer LB films was in the range of 10 1 to 10 2 S cm - 1 and dec…
Exchange coupling constants for di-μ-oxo-bridged copper(II) dimers with varying Cu−O−Cu bond angles have been calculated by means of density functional, broken symmetry (BS) techniques. The surprinsingly large ferromagnetism recently computed by Ruiz et al. [ Chem. Commun. 1998, 2767] for such model complexes has been…
Chemical transport experiments are a valuable aid of great potential in the synthesis and thermochemical characterization of solids. Compounds of interest can often only be crystallized by this method. The use of a transport balance allows very detailed observations, particularly of the course of the experiment over t…
The transient kinetics of the reaction between NO and CO on clean Rh(111) surfaces have been studied using molecular beams in conjunction with mass spectrometry detection. The changes in the partial pressures of the reactants (CO and NO) and products (N 2 and CO 2 ) as a function of time have been used as a measure of…
The homologous dendrimers G0 to G3, which consist of 3, 9, 21, and 45 viologens, behave as electron sponges and exhibit an electrochemically switchable, generation-dependent, intramolecular charge transfer (CT) complexation (see schematic diagram of G3).
The ring-opening polymerization of ε-caprolactone has been initiated by [tris(hexamethyldisilyl)amide]yttrium in the presence of an excess of 2-propanol. This initiating system is very active even at high alcohol-to-Y molar ratio. Polymers with controlled molecular parameters ( M n, end groups) and low dispersity are…
A self-assembly layer-by-layer (LBL) technique was used for the sequential adsorption of polycation, poly(diallyldimethylammonium chloride) (PDDA) and polyanion, sulfonated polyaniline (SPANI) on glass, indium-tin-oxide (ITO) coated glass plates, polystyrene sulfonate (PSS)/glass and PSS/ITO surfaces, respectively. Th…