Materials Literature
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The design, atomic characterization, performance, and relevance to clean technology of two distinct categories of new nanocatalysts are described and interpreted. Exceptional molecular selectivity and high activity are exhibited by these catalysts. The first category consists of extended, crystallographically ordered…
There is a tremendous need for organs and tissues to replace those lost due to diseases or trauma. In theory, transplanting cells on biomaterial matrices can create functional tissue. A critical question, however, is how to supply cells embedded within large cell-polymer constructs with sufficient oxygen and nutrients…
An ultra-fine grained (UFG) structure was introduced in a commercial 5083 Al alloy with an initial grain size of ∼ 200 \\micron using the equal channel angular pressing (ECAP) technique. ECAP was successfully conducted at 473 K on the same sample up to a total of 8 pressings through the die such that the sample was ro…
Chemical deposition techniques show distinct advantages for research tasks as well as for microelectronic production lines. This review will summarize the state of the art of the Chemical Solution Deposition (CSD) and of the Metal-Organic Chemical Vapor Deposition (MOCVD) processes for high-permittivity, ferroelectric…
The possible reduction of the chemical erosion yield of carbon Y chem with increasing hydrogenic ion flux is a critical issue for the use of carbon based plasma facing materials in future high flux confinement devices. The PISCES linear plasma device is used to assess carbon Y chem through nearly an order of magnitude…
Spiropyran or its preferred configurational isomers, respectively, are incorporated in faujasite (NaY, HY and DAY) cages by in situ synthesis, and in Si-MCM-41 channels by wetness impregnation. Luminescence spectra of the colored isomers indicate the non-aggregated incorporation of merocyanine forms. High quantum yiel…
Vanadium oxide nanorolls have for the first time been successfully used as cathode material in a rechargeable lithium battery. The rolls consist of vanadium oxide sheets arranged in a scroll-like manner. The layers are separated by structure directing templates ( e.g. , primary amines) which can be readily exchanged b…
The oxygen permeation fluxes from to across cobalt-containing perovskite ceramic membranes and were measured by gas chromatography as functions of oxygen chemical potential gradient, temperature, thickness, and catalytic activity on the surface. Power indexes for uncatalyzed and for were obtained when vs. was plotted…
We have studied adsorption of argon in a mesoporous silica controlled porous glass (CPG) over a wide range of temperatures by means of Grand Canonical Monte Carlo (GCMC) simulation. A numerical sample of the CPG adsorbent has been obtained by using an off-lattice reconstruction method recently introduced to reproduce…
The reaction mechanism of the most commonly used anode material, Ni/yttria-stabilized zirconia (YSZ) cermets, in solid oxide fuel cells (SOFCs) was investigated. Because the reaction mechanism for the Ni/YSZ anode in has not been conclusively determined, we investigated the detailed dependence of dc polarization and i…
A new organomontmorillonite (CM) for PI hybrids has been developed by ion-exchange reaction of cetyl pyridum chloride with Na+ montmorillonite (MMT). Polyimide/clay hybrids have been synthesized by employing two methods. Method I is by first blending a dimethylacetamide (DMAC) solution of 4,4′-oxydianiline diamine (OD…
The paper presents a finite element method (FEM) based analysis of interior permanent magnet synchronous motor, designed for flux-weakening operation. Flux-weakening performance determined from the FEM analysis on the proposed permanent magnet motor structure is presented in order to verify the suitability of the desi…
Crystalline poly(ethylene-co-vinyl alcohol) (EVOH) membranes were prepared by a thermally induced phase separation (TIPS) process. The diluents used were 1,3-propanediol and 1,3-butanediol. The dynamic crystallization temperature was determined by DSC measurement. No structure was detected by an optical microscope in…
Transition metal complexes of o -semiquinone (SQ) ligands have been studied extensively over the past 25 years. A particularly interesting aspect of this coordination chemistry concerns magnetic interactions between paramagnetic metal ions and the radical anionic ligands. In this review we begin with a survey of relat…
Medical science continues to battle against the loss or failure of organs or tissues. Since, skeletal muscle loss lead not only to the functional compromise of the affected site, but also a structural deformation; tissue engineering of skeletal muscle attempts to provide solutions to replace loss of tissue contour and…
The formation of space charge packets in crosslinked polyethylene (XLPE) tapes from un-aged cable insulation has been studied utilizing the pulsed electroacoustic (PEA) technique. The 150 /spl mu/m thick sheets were studied under constant applied DC field of 120 kV/mm at a temperature of 20/spl deg/C for a period of 4…
The preparation of a series of aminopropyl-substituted micelle templated silicas is presented, in which the materials are synthesised by a one-step co-condensation route using dodecylamine as template. The effect of solvent composition on the material properties, reactivity and catalytic activity is discussed. Increas…
Several new bulky salen-type Schiff base ligands and their complexes with first-row transition metals Co, Cu, Fe, Mn and Ni have been synthesized and characterized. The ligands contain tert-butyl and methyl(triphenylphosphonium chloride) substituents in aromatic rings providing flexible solubility properties. Crystal…
Ag–Al2O3 catalyst prepared by the sol–gel method was studied for the selective catalytic reduction (SCR) of NO by various hydrocarbons (HC-SCR). The rates of NO reduction and hydrocarbon conversion depend strongly on the type of hydrocarbon reductant; the rates were higher for the higher normal alkanes, higher for alk…
The one-dimensional polymer [Ru2(O2CCF3)4(Phz)]∞1 (Phz = phenazine) was synthesized by the reaction of RuII2(O2CCF3)4(THF)2 with phenazine. An X-ray crystallographic analysis revealed that the compound consists of Ru2(O2CCF3)4 units bridged by phenazine ligands. The Ru–Ru bond distance is 2.3109(10) Å and the axial Ru…