Materials Literature
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We have studied the electrical properties and microstructure of fluorine‐doped BaTiO 3 ceramics. The samples were prepared using a classical ceramic technology that involved the calcination of intimately mixed powders of BaCO 3 , TiO 2 , and BaF 2 . When the samples were sintered in untreated ambient air, the fluorine…
Abstract Hydrogen‐bonded supramolecular copolymers were easily prepared by mixing cyclohexanetricarboxamides with three ( 1 ) and six ( 2 ) alkylsilyl groups, and supramolecular fibers were fabricated. When the composition of 1 and 2 was at or close to equimolarity, the supramolecular copolymer chain was found to have…
The grating division-of-amplitude photopolarimeter (G-DOAP) is an instrument that exploits the multiple-beam-splitting, polarizing, and dispersive properties of diffraction gratings for the time-resolved measurement of the complete state of polarization of collimated broadband incident light, as represented by the fou…
Colloidal particles coated by polyelectrolyte multilayers of alternatingly positive and negative charge are shown to interact strongly with lipid vesicles. We have studied two cases: (i) the interaction between beads and small unilamellar vesicles (vesicles diameter smaller than the particles one), where we found evid…
The cell responses of rat osteoblasts and fibroblasts to water-soluble phosphorylated chitin (P-chitin) were examined in vitro. Cell morphology was observed at 1, 4 and 7 days, respectively. A wide range of measurements, including the percentages of viable cells, total intracellular protein content, and 3-[4,5-dimethy…
Near-field diffraction patterns are merely aberrated Fraunhofer diffraction patterns. These aberrations, inherent to the diffraction process, provide insight and understanding into wide-angle diffraction phenomena. Nonparaxial patterns of diffracted orders produced by a laser beam passing through a grating and project…
Ba 8 Ga 10 Si 36 and Ba8Ga16Si30 clathrates were prepared by the arc melting method and characterized for their structure, transport, and thermal properties by x-ray diffraction, electron probe microanalysis, electrical resistivity, and thermal conductivity measurements. The Rietveld refinement results gave the total…
Single-crystal X-ray diffraction studies of brochantite demonstrate its Order-Disorder (OD) character. The OD structures of the brochantite family can be described as built up by equivalent OD layers with symmetry Pn2 1 m. Two MDO polytypes are possible in this family, and both have been identified in specimens of bro…
A multilayer structure [TiN(5 nm)/interlayer metal(2 nm)/TiN(5 nm)] has been evaluated as a diffusion barrier between copper and silicon. Three metals (M=Ru, Cr, and Zr) were tested as interlayer materials for the multilayer diffusion barrier scheme, expecting that they will stuff the TiN grain boundaries by forming m…
Owing to microstructural effects, the corrosion rate of stainless steels undergoing intergranular corrosion in nitric acid (HNO3) solutions can be strongly anisotropic and hence corrosion testing of specimens containing exposed side and end grain can lead to significant overestimation of the corrosion rate of plate su…
Electro-optical and polarization current measurements on 1,3-phenylene-bis[4-(3-fluoro-4-decyloxyphenyliminomethyl) benzoate] (3F-10-O-PIMB) revealed a second order phase transition between two antiferroelectric ‘smectic banana’ phases. The observations show that the switching between the ferroelectric states in the h…
Abstract Poly(esters amide)s from adipic anhydride and α , ω ‐amino alcohols were obtained by polycondensation of α ‐carboxyl‐ ω ‐hydroxyl amides under mild conditions in solution or by bulk polycondensation at elevated temperatures. For the polycondensation in bulk the influence of catalyst and of temperature on the…
Abstract Natural fibre reinforced thermoplastics are usually processed in twin screw extruders. The present work studies the single screw extrusion process for different systems of natural fibre reinforced thermoplastics. For this study different polymer-fibre systems have been characterised in terms of the material p…
AIR QUALITY. Advanced industrialized nations have experienced severe pollution problems over the past forty years, caused mainly by carbon monoxide, hydrocarbons and nitrogen oxide emissions from automobiles. Catalyst technology has played a major part in minimizing these emissions as required by even more restrictive…
Activated carbon and five kinds of metal-ion-substituted activated carbons, viz. Ag + -activated carbon, Cu 2+ -activated carbon, Fe 3+ -activated carbon, Ba 2+ -activated carbon and Ca 2+ -activated carbon, were prepared. A model for estimating the activation energy of desorption was established. Temperature-programm…
The stress corrosion characteristics of 18 wt-%Ni (MDN-250) maraging steel and its weldments made under different welding conditions have been investigated. The threshold stress intensity factor K ISCC in stress corrosion conditions has been determined in 3.5 wt-%NaCl environment for the base metal and weldments. The…
We present a method for the analysis of ferromagnetic shields under low-frequency excitation conditions and demonstrate its validity. The source types are arbitrarily oriented current loops or multiconductor lines. We account for hysteresis by means of the Jiles-Atherton model and solve the relevant equations in the t…
Heat capacity of the PbMg1/3Nb2/3O3 compound is measured using the methods of adiabatic and differential scanning calorimetry in the temperature range 80–750 K. Two blurred anomalies on the C p (T) dependence are observed in wide temperature intervals of 200–400 K and 500–700 K. The results of studies are discussed to…
Abstract Generally, recycled polymer blends exhibit solid dispersion‐like morphology with poor mechanical properties. The aim of this work was to enhance the mechanical properties of a HDPE/PS (75/25) blend, in particular the stiffness and the impact strength. In order to improve the stiffness, CaCO 3 filler was incor…
Solid−liquid equilibrium (SLE) has been measured from 270 K to the melting temperature of the solid for 15 binary mixtures of an imidazole (1 H -imidazole, 2-methyl-1 H -imidazole, and 1,2-dimethylimidazole) with ethers [dipropyl ether, dibutyl ether, dipentyl ether, methyl 1,1-dimethylethyl ether ( tert -butyl methyl…