Materials Literature
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Highly oriented Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN50) thin films have been prepared using a sol‐gel method. A homogeneous and stable strontium barium niobate (Sr 1‐x Ba x Nb 2 O 6 , SBN) precursor solution could be prepared via the reaction control of metal alkoxides. The SBN precursor was stabilized by the coordination of t…
Hybrid bimetallic–TTF materials in which the organic layer adopts an unprecedented dimerized structure and the inorganic layer is formed by the first ferromagnetic Cr III –Mn II –Cr III complex are reported. These materials provide valuable information on the magnetic interactions between these metal ions which should…
In the present work we describe an investigation of the influence of low-energy ion irradiation (1-keV ${\mathrm{Ar}}^{+}$) on the surface structure of polycrystalline diamond and amorphous carbon films with various degrees of graphitization. Photoelectron spectroscopy (PES) with excitation energies in the ultraviolet…
The donor and acceptor charge-transfer transitions in YAl${\mathrm{O}}_{3}$:${\mathrm{Ti}}^{3+}$/${\mathrm{Ti}}^{4+}$ were investigated through absorption, emission, excitation, one-photon and two-photon photoconductivities, excited-state absorption, and thermoluminescence. The results are contrasted to similar studie…
Abstract In the present study the idea of five‐fold coordinated aluminium in Al 2 O 3 ‐rich aluminiumsilicate gels and glasses with compositions near to that of mullite (≈72 wt.% Al 2 O 3 , 28 wt.% SiO 2 ) is re‐aximated. Analyses of 27 AlMAS NMR spectroscopy and pair correlation functions on the basis of X‐ray diffra…
Abstract Drying of polymeric coatings often occurs under conditions where the relaxation time of polymer molecules is significant with respect to the processing time scales. The nonequilibrium thermodynamic theory of Durning and Tabor (1986) is applied to model 1‐D drying of viscoelastic solutions with concentration‐d…
An implant system that undergoes a gradual, time-dependent, nontoxic degradation process may offer an efficacious, safe, and desirable alternative to metallic materials used in the treatment of various musculoskeletal conditions. Such a scaffold may also be a suitable vehicle for growing cells and tissue in the labora…
Glasses from the RO.La 2 O 3 .B 2 O 3 (R = Mg, Ca, and Ba) systems have been examined. Glass formation is centered along the metaborate tie line, from La(BO 2 ) 3 to R(BO 2 ) 2 . Glasses generally have transition temperatures >60°C and expansion coefficients between 60 × 10 ‐7 /°C and 100 × 10 ‐7 /°C. Raman and sol…
A self-consistent mean-field treatment of branched polymer additives in a linear polymer matrix is developed in order to study the effect of chain architecture on surface segregation. With branched additives, connectivity between side chains and an increased number of chain ends results in near-surface concentration p…
Abstract Studies of the crystal structures and formation of a charge-transfer (CT) complex proved that 2,2′-bi-1H-imidazole (H2BIM0) forms a new system concerned with the interplay of proton-transfer (PT) and electron-transfer (or charge-transfer (CT)) interactions. X-Ray crystal analyses of newly isolated species, 2-…
It is obvious that functional activity of a protein molecule is closely related to its structure. On the other hand, the understanding of structure-function relationship still remains one of the intriguing problems of molecular biology. There is widespread belief that mutagenesis presents a real way to solve this prob…
Environmental scanning electron microscopy (ESEM) and atomic force microscopy (AFM) were compared as tools for the observation of bacterial biofilms developed on carbon steel and AISI 316 stainless steel surfaces under stagnant conditions. Biofilms were generated in batch cultures of two different isolates of marine s…
The poly(3-hydroxyalkanoate) (PHA) degrading isolate K10 was identified as Streptomyces exfoliatus. This bacterium is distinguished from other PHA-degrading strains by its ability to utilize both poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxyoctanoate) (PHO). A PHA depolymerase structural gene of S. exfoliatus (phaZ…
The band gaps and spectral shifts of CdS, CdSe, CdTe, AlP, GaP, GaAs, and InP semiconductor clusters are calculated from band structure calculations using accurate local and nonlocal empirical pseudopotentials. The effect of spin-orbit coupling on the band structures is included in the calculations when they are impor…
A microcellular plastic is a foamed polymer of a cell size in the range of 0.1 to 10 μm and a cell density in the range of 10 9 to 10 15 cells/cm 3 . Typically, microcellular plastics have been shown to possess superior impact strength, toughness, and fatigue life to solid polymers. Polymer/cellulosic-fibre composites…
Abstract The syntheses of the dihydroazulenes (DHAs) DHA‐a‐DHA‐f containing covalently linked heteroaromatic subunits derived from dibenzodioxin, thianthrene, phenoxathiine, N ‐methylphenothiazine, N ‐methylphenoxazine, and N,N′ ‐dimethylphenazine groups are described, and their spectroscopic and analytical data are r…
Broadening of (X-ray) diffraction lines is often due to the distortion fields associated with lattice defects as dislocations. A generally applicable flexible model for distributions of lattice defects and their distortion fields is presented. The model allows a straightforward calculation of diffraction-line profiles…
Captopril protects rat lung from radiation-induced pneumonitis and fibrosis and preserves function and survival in experimental radiation nephropathy. This study determined the structural benefit of captopril used preventively in radiation nephropathy. Twenty-eight Wag/RijMCW rats, divided in six groups, received 0 to…
1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU), one of the chloroethyl nitrosoureas, is effective against malignant glioma. To develop its use in intrathecal chemotherapy, we encapsulated BCNU in hybrid liposomes composed of dimyristoylphosphatidylcholine and micellar surfactants (Tween 20) and dissolved it in artificial…
Extensive studies of ion implantation into near surface areas of materials have demonstrated astonishing changes of such properties as surface tension, friction, and durability. The cost of implanted ions is currently rather high due to the limited ion current density of the usual ion sources, especially if ions from…