Materials Literature
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Using transmission electron microscopy a systematic study of the dislocation microstructure after cyclic deformation of nickel single crystals was undertaken in order to describe quantitatively the influence of deformation temperature on microstructural parameters. The frequency distributions of the heights and length…
A new levitation apparatus coupled to a synchrotron-derived x-ray source has been developed to study the structure of liquids at temperatures up to 3000 K. The levitation apparatus employs conical nozzle levitation using aerodynamic forces to stably position solid and liquid specimens at high temperatures. A 270 W CO2…
The possibility of processing MPS 3 (M = Mn, Cd) layered materials as thin films capable of intercalating nonlinear optical chomophores is investigated. Two different synthetic routes are presented. The first method (solution approach) involves the coprecipitation of transition-metal ions Mn 2+ with ligands (P 2 S 6 4…
Poly[( R )-3-hydroxybutyrate] (P(3HB)) single crystals, which had different morphologies with and without chain-folding surfaces, were grown from dilute solutions of chloroform and ethanol. Two types of extracellular PHB depolymerases purified from Alcaligenes faecalis T1 and Comamonas acidovorans YM1609, defined as t…
The optical absorption and fluorescence of Pr${}^{3+}$ ions in yttria-stabilized zirconia single crystals are investigated. Fluorescence emissions from the ${}^{1}{D}_{2}$ level are clearly dominant and low intensity emission lines from the ${}^{3}{P}_{0}$ and ${}^{1}{G}_{4}$ states are also observed. Analysis with th…
The effect of the reorientation of 90° domains on the electric-field-induced strains was studied for tetragonal lead zirconate titanate (PZT) ceramics. An in situ X-ray diffraction (XRD) method was used to evaluate the 90° domain reorientation under electric fields. The strains caused by the reorientation were calcula…
The nifV gene product (NifV) from Azotobacter vinelandii was recombinantly expressed at high levels in Escherichia coli and purified. NifV is a homodimer that catalyzes the condensation of acetyl coenzyme A (acetyl-CoA) and alpha-ketoglutarate. Although alpha-ketoglutarate supports the highest level of activity, NifV…
Single crystals of ${\mathrm{La}}_{0.85}{\mathrm{Sr}}_{0.15}{\mathrm{MnO}}_{3\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ were prepared with various oxygen vacancies from \ensuremath{\delta}=0 to \ensuremath{\delta}=0.055. The $b$ and $c$ lattice parameters were found to increase with \ensuremath{\delta} wher…
The dielectric loss of cyclo-octanol has been investigated in a very broad frequency window of more than 17 decades. The relaxational response was traced in the plastic and the supercooled plastic phase, which are governed by the same relaxational dynamics. Experimental evidence is provided for two additional relaxati…
The double-layer structure of Langmuir−Blodgett (LB) multilayer assemblies formed by a thermotropic polyacrylate with 2-hydroxyethyl and [[[[(2-methylbutyl)oxy]phenyl]azo]phenoxy]hexyl side groups is modified by annealing and on ultraviolet (UV) irradiation. Both procedures cause order−disorder transitions. The intera…
We have analyzed the influence of different amounts w bc of two diblock copolymers, poly(styrene- b -methyl methacrylate) (sm blend series) and poly(cyclohexyl methacrylate- b -methyl methacrylate) (cm blend series), on the morphological and rheological characteristics of a blend containing w = 7.5 wt % polystyrene in…
Palladium-catalyzed polycondensation between diiodoferrocenes (1,1‘-diiodoferrocene and 1,6-diiodo-1‘,6‘-biferrocene) and diethynyl aromatic compounds HC⋮C Ar C⋮CH (e.g., 2,5-diethynylpyridine and 2,5-diethynyl-3-hexylthiophene) gives poly(aryleneethynylene) (PAE) type polymers containing the ferrocene unit in the π-c…
Stereoregular polymerization of ( o -ethoxyphenyl)acetylenes (OEPA) was performed using a [Rh(norbornadiene)Cl] 2 catalyst in the presence of triethylamine to give poly(( o -ethoxyphenyl)acetylene) (POEPA) bearing a cis-transoid form under mild conditions. The polymer underwent isomerization from the predominant cis f…
Abstract For mixed-layer clay fractions from the North Sea and Denmark, X-ray diffractograms have been recorded for specimens saturated with Mg, Ca, Na and NH 4 , both airdry and intercalated with ethylene glycol, and the patterns have been computer-simulated with a multicomponent program. The mixed-layer fractions co…
Asymmetric ferroelectricity and conduction of anomalous leakage current were observed in heteroepitaxial BaTiO 3 thin films grown by rf magnetron sputtering at 600° C on three different electrode/substrate combinations: SrRuO 3 /SrTiO 3 , Pt/MgO and Nb doped SrTiO 3 . The voltage shift of hysteresis loops of the capac…
Fourier transform Raman spectroscopy of a thiophene solution shows a reduction of aromaticity of the thiophene ring by the interaction with a solvated Lewis acid, which lowers the oxidation potential of the monomer. Low-potential electrochemical deposition of polythiophene was carried out in the presence of a Lewis ac…
Three one-dimensional molybdenum oxide/2,2‘-bipyridine species have been prepared by hydrothermal methods and structurally characterized. The reaction of MoO 3, 2,2‘-bipyridine, and H 2 O in the mole ratio 1:0.68:680 at 160 °C for 120 h in a 23 mL Teflon-lined Parr acid digestion bomb produces colorless rods of [MoO 3…
We have examined the Raman spectra of violet and infrared emitting Ge+-implanted SiO2 films with special emphasis upon annealing temperature (AT) dependence of Raman scattering. We found that the complete spectrum mainly consists of three bands at 220–280, 300, and 430 cm−1, corresponding to scattering of Ge-related c…
Bubble levitation in an acoustic standing wave is re-examined here for the case of single-bubble sonoluminescence. The equilibrium position of the bubble is calculated by equating the average Bjerknes force with the average buoyancy force. The predicted values, as a function of pressure amplitude, are compared with ex…
Ferroelectric properties and the effect of Li + and Mg 2+ dopants in II–VI semiconductor ZnO were studied. The ferroelectric D – E loops were observed in Zn 1- x (Li 0.02 ·Mg x -0.02 )O, as well as in Zn 1- x Li x O. The transition temperature ( T c ) increases in proportion to the concentration of Mg 2+ ions, while i…