Materials Literature
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The room-temperature high energy ball-milling technique was used to prepare nanophase Ce1-xZrxO2 (x=0; 0.2; 0.5; 0.8; 1) catalysts. The acid–base properties of these catalysts were investigated by means of adsorption microcalorimetry, using NH3 and CO2 as probe molecules. The catalytic activity for 4-methylpentan-2-ol…
La (1 – x) NiO (3 – δ) perovskites present high metallic conductivity and Pauli-paramagnetism, and could be used as electrodes in electrochemical devices such as SOFCs, PEMFCs and MCFCs. Additionally, due to its σ* conducting band, this material shows a very high electrocatalytic activity, particularly in oxygen reduc…
Silicate macroskeletons which have both templated mesoporosity and open-cell macrovoid structures have been prepared in monolithic form at near ambient temperatures from continuous metastable foams of non-ionic alkylpolyethylene oxide surfactants under aqueous, neutral pH reaction conditions.
In this work, standard characterization methods like hysteresis loops and C-V- measurements are used to distinguish the reversible and irreversible parts of the total ferroelectric polarization. Special attention has been given to the frequency dependence of the hysteresis loops-and the C-V-measurements. The frequency…
Abstract Soybean proteins recently have been considered as petroleum polymer alternatives in the manufacture of adhesives, plastics, and various binders. The objective of this work was to characterize the plastic performance of soybean protein components during molding processes. Two major soybean protein fractions, 7…
A new precursor technique for the carbothermal synthesis of nanocrystalline AlN powder has been developed. A precursor that contains an intimate mixture of nanocrystalline Al 2 O 3 and carbon has been synthesized by using a chemical pyrophoric reaction. The formation of AlN starts at 1473 K, and complete conversion ha…
Transition metal oxoborates are of interest for magnetic and optical properties. Crystals of many M II 2 M III O 2 BO 3 and M II M III OBO 3 materials can be grown from borate fluxes. In the Fe II -Fe III -B-O system, flux growth results in Fe 3 O 2 BO 3 crystals, but solid state reaction at higher temperatures has yi…
Readily available Cy6Si6O9 2 (Cy = c-C6H11) reacts with aqueous NEt4OH in THF to afford endo-C2h-Cy6Si6O7(OH)4 3a, which upon further hydrolysis produces CySi(OH)3 fragments capable of reacting with 3a to produce endo-C3-Cy7Si7O9(OH)3 1b; the reaction of 2 with aqueous NEt4OH in the presence of (vinyl)Si(OMe)3 affords…
Two different morphologies of porous layers were observed in (100)‐oriented n ‐ InP anodically etched in an aqueous solution of HCI . At high current density ( 60 mA / cm 2 ) anodization leads to the formation of so‐called current‐line oriented pores. When the current density decreased to values lower than 5 mA / cm 2…
The electrical conductivity and conductivity relaxation of $x{\mathrm{Na}}_{2}\mathrm{O}\ensuremath{-}(100\ensuremath{-}x){\mathrm{TeO}}_{2}$ glasses have been investigated in the frequency range of 10 Hz--2 MHz and in the temperature range of 373--533 K and compared with the results of silicate and borate glasses. Th…
Two new ferromagnetic, end-on azide-bridged nickel(II)-dimers [{Ni(terpy)(N3)2}2]·H2O 1 and [Ni2(terpy)2(N3)3(H2O)]ClO4·H2O 2 (terpy = 2,2′∶6′,2″-terpyridine) have been synthesized and magnetostructurally characterized through X-Ray single crystal analysis, IR spectroscopy and magnetic susceptibility measurements. The…
Complex permeability /spl mu/*(=/spl nu/'-i/spl mu/") of permalloy (Fe/sub 0.55/Ni/sub 0.45/) composite materials has been studied in the frequency range from 10 kHz to 2 GHz for two different particle sizes of permalloys (particle diameter d<45 /spl mu/m and d<6 /spl mu/m). Low frequency permeabilities of small parti…
The crystal structure of Bi 2 W 2 O 9 has been solved by single crystal X-ray diffraction data analysis and refined to R=0.046 for 991 independent reflections. Bi 2 W 2 O 9 crystallizes with orthorhombic symmetry, Pna2 1 space group, Z=4, a=5.440(1), b=5.413(1), c=23.740(5) Å. The model previously proposed by Watanabe…
This paper reviews the performance of the state-of-the-art solid oxide fuel cells that are fabricated using air electrode tubes, and discusses studies that are currently underway to reduce cell cost. A new design cell that combines the seal-less feature of tubular cells and a flattened air electrode with integral ribs…
The electrical currents that flow in and on insulators are small, but they may be important in applications and they may indicate the mechanism of carrier motion. The processes which come into play include mobility and ionization, trapping and detrapping, and injection and blocking. Some of these phenomena are intrins…
Trehalose was compared with glucose in its use as an embedding medium for the preparation of two-dimensional crystals for electron crystallographic structure analysis. Purple membranes (two-dimensional crystals of bacteriorhodopsin) embedded in either sugar were studied in a 'partially hydrated' state as well as after…
In this study, we present the results of the influence of chemical additives (antioxidant and UV stabilizer) and pigments (titanium dioxide and carbon black) on the short-term dielectric breakdown test of high-density polyethylene (HDPE). These additives and pigments are commonly added to polyolefins, which are used a…
Abstract A simplified reaction pathway was proposed to describe the kinetic behavior of catalytic wet oxidation of organic mixture. The oxidation reactions were divided and lumped into two groups: (1) the deep or complete oxidation reactions with formation of CO 2 and H 2 O; (2) the partial oxidation reactions with fo…
A general framework for the physical description of partial discharge (PD) processes is presented that holds for different types of PD causing defects. A PD process is treated as a stochastic process consisting of short duration discharges (point-like in time) and charge carrier drift/recombination intervals between t…
The necessary condition of the active sites for the NO decomposition reaction on copper ion-exchanged ZSM-5-type zeolite (CuZSM5) has been investigated by using an adsorbed N2 species that is one of the products of the decomposition reaction of NO. Two dominant types of exchangeable sites in the CuZSM5 sample were ide…