Materials Literature
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The asymptotic theory is used for evaluation of the cross section of resonant charge exchange for most elements of the periodical system. An analysis is given of the accuracy of the data obtained. The error for the cross sections at collision energies of the order of 1 eV varies from 1% for hydrogen and elements of th…
Using half-metallic ferromagnets in spin-dependent devices, like spin valves and ferromagnetic tunnel junctions, is expected to increase the device performance. However, using the half-metallic ferromagnet NiMnSb in such devices led to much less than ideal results. One of the possible sources for this behavior is atom…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of a Polypeptide Multi-Block Copolymer Modeled on Dragline Silk ProteinsYun Qu, Sonha C. Payne, Robert P. Apkarian, and Vincent P. ConticelloView Author Information Department of Chemistry, Oglethorpe University Atlanta, Georgia 30319 Integrated Microscop…
We describe polarizing films formed from the lyotropic liquid crystalline phases of dyes dissolved in water. The dye polarizers possess a high dichroic ratio close to that of conventional polarizers. In addition, the dried dye films provide a uniform homogeneous orientation for thermotropic nematic materials. Therefor…
Environmental conditions under which localized corrosion of carbon steel could take place in simulated groundwater were examined. Using specimens with crevices, it was determined that at potentials above the repassivation potential, the ratio of the chloride concentration to the total carbonate concentration, solution…
The synthesis of aluminum nitride (AlN) via self‐propagating high‐temperature synthesis (SHS) was attempted, using aluminum powder that was mixed with AlN powder as a diluent. The AlN content in the reactant was varied over a range of 30%–70%, and the nitrogen pressure was varied over a range of 0.1–1.0 MPa. The SHS r…
A mathematical model based on Frenkel's theory for charged defect segregation at interfaces is used to calculate the equilibrium grain boundary depletion layer widths and conductivity profiles in acceptor‐doped SrTiO 3 ceramics. The calculations examine the effect of oxygen vacancy equilibration during annealing at mo…
Glasses in the system xFeCl3–10Fe2O3–(90–x)P2O5 have been prepared by the normal quenching method over a wide range of composition (x = 15 up to 50 mol%). The glass structure has been investigated using IR spectral analyses which shows that the intermediate range order is affected by substitution of FeCl3 for P2O5. Th…
We have measured the photoconductivity of insulative SrTiO 3 single crystal whose band-gap is 3.2 eV. We have found that the dependence of resistivity on temperature shows metallic conduction under white light irradiation and the resistivity drops rapidly below 105 K. This temperature at which a giant photoconductivit…
The absolute detection efficiency (ADE) of microchannel plates for neutral sodium and potassium atoms is measured in the low keV energy range. It is shown that ADE is primarily a function of the particle energy. This result is compared to measurements made by other authors for ionic particles.
A new technique for measuring the electro-optic coefficient of nonlinear optical polymer is described. In an attenuated-total-reflection experiment the refractive index of the poled polymer is changed because of the Pockels effect. This change causes a shift of the angular position of the surface plasmon modes that co…
Samples of rapeseed oils were oxidized at isothermal conditions in the cell of a pressure differential scanning calorimeter (PDSC). The experiments were carried out under 1400 kPa oxygen pressure at a temperature in the range of 113—144 °C. From resulting PDSC exotherms the times to reach the peak maximum (τmax) were…
Abstract Methods for the incorporation of phosphate and phosphonate units into the side groups of phosphazenes, at both the high polymeric and cyclic trimer levels, are described and evaluated. Halogenated organophosphates were used as the phosphorylating agents and were allowed to react with hydroxyl‐ or lithio‐funct…
Infrared-to-visible upconversion emission enhancement through thermal effects in Yb3+-sensitized Pr3+-doped fluoroindate glasses excited at 1.064 μm is investigated. A twentyfold increase in the 485 nm blue emission intensity as the sample temperature was varied from 20 to 260 °C was observed. The visible upconversion…
Cu(I) (Cu + ) ion catalysts anchored onto various oxides (SiO 2 ·Al 2 O 3, Al 2 O 3, and SiO 2 ) were prepared by the combination of an ion-exchange method and a thermovacuum treatment. XAFS (X-ray absorption fine structure) investigations revealed that Cu + ions exist as linear two-coordinate Cu + on SiO 2 ·Al 2 O 3,…
Optical absorption of single-crystal, cerium-doped lutetium oxyorthosilicate has been carefully measured in the temperature interval 10--300 K. Prominent Gaussian absorption peaks occur at $3.432\ifmmode\pm\else\textpm\fi{}0.002\mathrm{eV}$ (peak a), $3.502\ifmmode\pm\else\textpm\fi{}0.002\mathrm{eV}$ (peak b), $4.236…
A series of m-terphenyl-based ligands bearing three coordinating oxyacetate and two amido or two sulfonamido groups, (1a-b)H3 and (2)H3, respectively, have been synthesized and characterized. The structures of the corresponding neutral complexes have been studied using 1H-NMR spectroscopy and luminescence experiments.…
The difference in threshold between sonoluminescence (SL) and sonochemical luminescence (SCL) has been investigated. The intensity of both SL from distilled water and SCL from a luminol solution in a rectangular glass cell was measured while changing the driving frequency and voltage applied to the transducer. The sec…
ABSTRACT: Power measurements (input power to ultrasound generator, input power to transducer, and ultrasonic power entering the treatment medium) were compared to the inactivation effect of ultrasound under pressure (manosonication, MS) treatments on Listeria monocytogenes ATCC 15313 in pH 7 citrate‐phosphate buffer.…
The syntheses of two novel iptycene monomers, 1,4-diiodotriptycene ( 5 ) and 2,3-diiodo-4,9-dihydro-4,9-benzonaphtho[2,3, c ]thiophene ( 10), are described herein. These monomers were subsequently copolymerized with a number of diethynylphenyl monomers via a Sonogashira−Hagihara coupling to afford both regiodefined po…