Materials Literature
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In the absence of moisture and at room temperature, the activity and saturation of CO on gold cluster anions, Au(N)-, are known to be highly dependent on the size of the cluster. Small Au(N)- clusters (N = 2,3) showed no adsorption activity, and the saturation CO adsorption values did not increase proportionately to c…
Amorphous silica and related silica-based materials have been widely developed in optoelectronics and optical telecommunications technology. Despite comprehensive research for over the decades, the subject of amorphous silica continues to excite the interest of researchers in the field of chemistry, physics, and geolo…
Y2O3:(Eu,B) red phosphor was obtained by a thermal decomposition technique of a mixture of yttrium–ethylenediaminetetraacetic acid (Y–EDTA), Eu–EDTA and boric acid. The doping ratio of boron, [B]/([Y]+[Eu]), in the starting material was varied from 0 to 1. The properties of morphology, crystallization behavior, metal…
In this paper we report the synthesis and characterisation of the perovskite cuprate phases YSr2Cu2MO7+y (M = Co, Fe) in order to examine their potential for use as cathode materials in solid oxide fuel cells (SOFCs). Both samples showed conductivities of ≈10 S cm−1 at 900 °C and were also shown to be stable at this t…
Metal-oxide interfaces of three different materials irradiated in a pressurized water reactor have been analyzed by TEM and AEM. Standard Zircaloy-4. low-tin Zircaloy-4. and Zr-2.5%Nb were used for this study. The microstructure of the material on the two sides of the metal-oxide interface, the geometry of the interfa…
We report a new type of 2,2'-bipyrrole derivatives that bear four aryl groups at the 1, 1', 5 and 5' positions.These compounds were synthesized by two routes: (i) the reaction of 1,8-diaryl-2,7-ditosyl-1,7-octadiene-3,5-diynes (4) with anilines was performed in the presence of CuCl at 150 o C; (ii) the above compound…
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…