Materials Literature
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Abstract The thermal effects, as well as the survivability and origins of microorganisms in Cretaceous rocks, are evaluated from the timing and extent of the smectite to illite transformation in Cretaceous bentonites collected from cores outside the thermal aureole of the Pliocene Cerro Negro volcanic neck. Overall, r…
The processes of the energy deactivation of electronic excitation in Yb(III) -diketonates and their dependence on the nature of -diketone and the second ligand as well as the environment and its state (complexes in organic solvents and polymer matrix) were studied. Taking as an example the ytterbium thenoyltrifluoroac…
An experimental study was conducted to investigate the performance of several polymer outdoor insulator formulations under AC and DC electrical stresses. The performance of the polymers was evaluated in terms of their charge accumulation and decay characteristics as a function of humidity, and their tracking and erosi…
Abstract Because layered Fe(II)Fe(III)-hydroxides (Green rusts, GRs) are anion exchangers, they represent potential orthophosphate sorbents in anoxic soils and sediments. To evaluate this possibility, two types of experiments with synthetic sulphate-interlayered GRs (GR SO4 = Fe 2+ 4 Fe 3+ 2 (OH) 12 SO 4 ×H 2 O) were…
The affects of lipase concentration on ring-opening bulk polymerizations of epsilon-caprolactone and trimethylene carbonate were studied by using Novozym 435 (immobilized form of lipase B from Candida antarctica) as biocatalyst. The polymerization of epsilon-caprolactone was carried out in bulk at 70 degrees C. Three…
Abstract The reactive compatibilization of polypropylene/polyethylene terephthalate (PP/PET) blends by addition of glycidyl methacrylate grafted PP (PP‐g‐GMA) was studied. Two PP‐g‐GMA copolymers, containing either 0.2 or 1.2 wt% of GMA, were used as interface modifiers. These were incorporated into PP blends (with ei…
We present here a detailed structural comparison, both in the solid state and in aqueous solution, of a complete series of lanthanide cryptate complexes of a Schiff base axial macrobicyclic ligand L of general formula [LnL][NO 3 ] 3 · x H 2 O (Ln = La−Lu, Y); the macrobicyclic receptor L is an azacryptand N[(CH 2 ) 2…
The new phthalocyanine-like macrocycle tetrakis(selenodiazole)porphyrazine, TSeDPzH 2 , and its Mg ( II ) and Cu ( II ) complexes have been prepared and their general, spectroscopic (IR, UV-vis), and magnetic properties investigated. It has been observed that the peripheral selenodiazole rings of the TSeDPz skeleton c…
The structure and powder diffraction data of Hägg-carbide (χ- Fe 5 C 2 ) have been redetermined and improved by X-ray diffraction. Experimental values of 2θ, corrected for systematic errors, relative peak intensities, lattice spacings, and the Miller indices of 27 observed reflections up to 100° 2θ are reported. The u…
1. We have used fluorescence confocal laser scanning microscopy to attain the three-dimensional (3-D) microstructure of perimysial collagen fibres over the range of sarcomere lengths (1.9-2.3 micrometers) in which passive force of cardiac muscle increases steeply. 2. A uniaxial muscle preparation (right ventricular tr…
The luminescence properties at room temperature and 77 K of octamethylcorrole are reported for the first time, together with the photophysical behaviour of corrole-corrole and porphyrin-corrole dyads covalently linked through the 10-position with a phenyl bridge. The photophysical properties of corrole free base are v…
We present a comprehensive theory of the magnetization relaxation in a Mn 12 -acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data inc…
Potentiodynamic polarization curves were measured for types 304 (UNS S30400), 316L (UNS S31603), and 904L (UNS N08904) stainless steels (SS) in 1 M sodium chloride (NaCl) solutions with various thiosulfate additions at temperatures from 20°C to 90°C. A minimum concentration of thiosulfate was required for activation o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTIn Situ X-ray Diffraction during Forced Silking of Spider SilkChristian Riekel, Martin Müller, and Fritz VollrathView Author Information European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France Department of…
We report the results of a Monte Carlo simulation study of isolated comb copolymer cylindrical brushes. The conformational characteristics of molecules consisting of a flexible backbone densely grafted with side chains strongly depend on the rigidity of the side chains, which is exemplified by using both fully flexibl…
Undoped and Bi-doped nanocrystalline ZnO was prepared by the inert gas condensation method. Samples of different grain sizes were obtained by annealing treatments at various temperatures. The dc and ac electrical conductivity of undoped and Bi-doped nanocrystalline ZnO was investigated as a function of grain size. In…
Abstract Adsorptive-type organoclays, where hydrocarbons adsorb directly to the siloxane surfaces, were studied to find new organic cations and to determine the parameters that produce effective sorbents. Organoclays were prepared from hectorite by cation exchange with small, aromatic organic cation salt solutions. Tr…
Self-assembly of beta-sheet domains resulting in the formation of pathogenic, fibrillar protein aggregates (amyloids) is a characteristic feature of various medical disorders. These include neurodegenerative diseases, such as Alzheimer's, Huntington's, and Creutzfeldt-Jacob's. A significant problem in studying such ag…
Abstract The fine silt (2–5 μm) and fine clay (<0.1 μm) fractions from four acid soils developed from moraines of increasing age (80, 400, 3,000 and 6,500 years old) in Switzerland, were studied by X-ray diffraction and chemical analyses. The soil parent material is homogeneous at the four sites and the soils can b…
Dense mullite ceramics were successfully produced at temperatures below 1300°C from amorphous SiO 2 ‐coated gamma‐Al 2 O 3 particle nanocomposites (AS‐gammaA). This method reduces processing temperatures by similar/congruent300°C or more with respect to amorphous SiO 2 ‐coated alpha‐Al 2 O 3 particle microcomposites (…