Materials Literature
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A novel one-step solvothermal process has been developed for the preparation of Eu 3 + actived yttrium oxysulfide phosphor in ethylenediamine solvent at 280 ° C through a reaction of yttrium oxide, europium oxide, and sulfur powder. The products were characterized by X-ray diffraction, photoluminescence, and scanning…
reacted with s-valine (2) in acetic acid and the resulting imide-acid [N,N'-(pyromellitoyl)-bis-s-valine] (4) was obtained in high yield. The compound (4) was converted to the N,N'-(pyromellitoyl)-bis-S-valine diacid chloride (5) by reaction with thionyl chloride. The polycondensation reaction of this diacid chloride…
A series of spiropyrans possessing photochromic properties in solid state were investigated. UV irradiation ( λ max = 365 nm) of the thin vacuum deposited spiropyran films results in conversion of the colorless form to the photocolored one. The reaction is photochemically and thermally reversible. The photochromic act…
The investigations presented show that pulling a disc-shaped specimen through the rounded hole can be considered as a perspective test method for textile hand evaluation. It was de- termined that the process of pulling a comparatively big specimen (∅ 113 mm) through a relatively small hole (∅ 20-40 mm) ends in the for…
Chitosan is a biocompatible and biodegradable natural polymer with established antimicrobial properties against specific microorganisms. The present study demonstrates its antibacterial activity against 48 isolates of Vibrio species from prawn larval rearing systems. The antibacterial activity had a positive correlati…
The Ce <sub>x</sub> Ba <sub>1−x</sub> MnAl <sub>11</sub> O <sub>x</sub> catalysts are synthesized in reverse microemulsions using inexpensive inorganic salts as precursors, which have high surface area and high activity for methane combustion.
The influence of solid insulating barriers to the impulse strength of air gaps has been investigated by few researchers. It is well known that thin insulating materials increase considerably the breakdown voltage, sometimes two to three times. Some researchers performed thorough investigations for the determination of…
Non-covalently functionalized single walled carbon nanotubes (SWNTs) have been coated with CdE (E = S, Se) by liquid phase deposition (LPD) from aqueous and hydrocarbon solution. The coating of individual SWNTs versus small ropes or composite structures is controlled by the use of SDS surfactant SWNTs and the relative…
An unconventional but easily accessible precursor route involving the thermal treatment of hybrid precursors containing an ampholytic polymer matrix is developed to prepare multimetallic oxides of catalytic interest such as transition metal molybdates. A copolymer of diallyldimethylammonium chloride and a functionaliz…
A DNA fragment from Microbacterium liquefaciens AJ 3912, containing the genes responsible for the conversion of 5-substituted-hydantoins to alpha-amino acids, was cloned in Escherichia coli and sequenced. Seven open reading frames (hyuP, hyuA, hyuH, hyuC, ORF1, ORF2, and ORF3) were identified on the 7.5 kb fragment. T…
Single and multi-unit floating matrices of risedronate sodium were prepared using Gelucire 43/01 by melt solidification and melt granulation technique, respectively. The controlled release floating matrices were evaluated for in vitro and in vivo floating ability and in vitro drug release. Effect of aging on Gelucire…
Angle-scanned X-ray photoelectron diffraction (XPD) and scanning tunneling microscopy (STM) are used to characterise the structure of TiO2 nanoparticles grown on a Pt(111) single crystal surface. The nanoparticles grow over a well-ordered oxide interfacial layer that displays a (square root 43 x square root 43) - R7.6…
Ceramic oxygen generators (COGs) with a bilayer-electrolyte (erbia-stabilized bismuth oxide/samaria-doped ceria) architecture were developed to produce pure oxygen from C O 2 at lower temperature (below 700 ° C ) for potential use in NASA’s Mars exploration mission. Major factors that influence oxygen generation inclu…
Density functional theory-based electronic structure computations on small models of the diamond {100} surface have enabled prediction of the energetics and activation parameters of a number of plausible mechanistic steps for boron incorporation into, and boron loss from, the growing diamond surface. Initial proving c…
o-Nitrobenzyl photochemistry as induced by UV-A irradiation was applied to a photoactivated drug releasing system based on a molecular beacon strategy. A stem-and-loop structured oligodeoxynucleotide (ODN) possessing a photoreactive o-nitrobenzyl chromophore at the 3'-end and 1-aminonaphthalene quencher at the 5'-end…
Biodegradable polymers/oligomers based on epsilon-caprolactone (CL) were end-functionalized by a cholesteryl moiety. The functionalized polymers/oligomers, Chol-(CL)n, were synthesized through ring-opening polymerization initiated by cholesterol with a hydroxyl group. The chemical structure of end-functionalized polym…
Tc metal and metal-like carbide phases are revisited with special attention given to Tc-rich phases in the view of prospective nuclear fuel utilization and alternative transmutation targets fabrication. A new Tc-metal phase has been found and new softer conditions for the Tc carbide formation were observed. The unit c…
Abstract Fumed nanosilicas with different degree of silanization were used to obtain nanosilica‐polyurethane (TPU) composites to modify their rheological and mechanical properties. The higher the silanol content of the nanosilica, the higher the storage modulus and the thermal stability of the silica‐TPU composite. DM…
Significant data and milestones in the development of the ZIRLO alloy for PWR applications are reviewed. From humble beginnings as an R&D program, an approach to improving the corrosion resistance of zirconium-based alloys was developed. The corrosion resistance of dilute alloys is controlled by the microstructure…
Abstract This article reviews general corrosion of uranium and its alloys under atmospheric and aqueous exposure as well as with gaseous environments. It describes the dependence of uranium and uranium alloy corrosion on microstructure, alloying, solution chemistry, and temperature as well as galvanic interactions bet…