Materials Literature
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Electrochemical polymerisation has been found to be a convenient method for the synthesis of a thin film composite of a conducting polymer (polypyrrole) and strongly luminescent CdTe semiconductor nanocrystals. Optimal conditions (relatively low anodic potential, neutral pH, aqueous solution) for the synthesis of unif…
Failures of small internal diameter vascular grafts have been caused by the lack of a stable endothelial lining to form on their artificial surfaces. Polymer surfaces can be optimized by means of proper treatment to allow a homogeneous and uniform coverage in artificial prosthesis applications. Several solutions were…
Porous gold structures with nearly regular 15 μm channels have been prepared by a novel route in which the calcium carbonate skeletal plates of echinoids (sea urchins) are used as templates.
In this article we discuss the state of the art in the field of second-order non-linear optical polymers. More specifically, we highlight those results that we think made an important contribution to the field, combined with some of our own results. We start with a general overview of all the aspects involved in chara…
Fe-ZSM-5 showed the best catalytic performance (nearly 100% N2 yield) and resistance to water vapor for selective catalytic oxidation of NH3 to N2 at a high gas hourly space velocity (2.3 × 105 h−1) among transition-metal (Cr, Mn, Fe, Co, Ni and Cu) ion-exchanged ZSM-5 catalysts.
An enzymatic method to graft hexyloxyphenol onto the biopolymer chitosan was studied. The method employs tyrosinase to convert the phenol into a reactive o-quinone, which undergoes subsequent nonenzymatic reaction with chitosan. Reactions were conducted under heterogeneous conditions using chitosan films and also unde…
Films of charge-ordered ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ ${\mathrm{Gd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ ${\mathrm{Y}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ and ${\mathrm{Nd}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ show insulator-metal transitions on the passage of sm…
Molecular Magnetism. Theory of Molecular Magnetism. Characterization of Molecular Magnetism. Mechanism of the Spin Alignment of Molecular Magnetism. Molecular Design and Synthesis for Organic Molecular Magnetism. Molecular Design and Synthesis for Inorganic Molecular Magnetism.
Calculation of the electric field and potential distribution is extensively performed in the design and development of nonceramic insulators for high voltage transmission applications. This paper applies a two-dimensional (2-D) and a three-dimensional (3-D) electric field analysis program to calculate the field distri…
An explanation for the chemical changes which lead to high‐rate dissolution of sulfide inclusions and hence to pit initiation is found in the composition changes induced in the sulfides as the steel cools from the melting temperature of the steel to the solidification temperature of the sulfide. In this temperature re…
L. J. Garay,1,2 J. R. Anglin,1,3 J. I. Cirac,1 and P. Zoller1 1Institut fur Theoretische Physik, Universitat Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria 2Instituto de Matematicas y Fisica Fundamental, CSIC, C Serrano 121, E-28006 Madrid, Spain 3Institute for Theoretical Atomic and Molecular Physics, Harv…
Easily accessible liquid crystals of 1-alkylimidazolium salts having a bilayer structure, are good solvents providing a partially ordered reaction environment.
This perspective on blood- materials interactions is intended to introduce the set of papers stemming from the symposium, "Devices and Diagnostics in Contact with Blood: Issues in Blood Compatibility at the Close of the 20th Century," organized on August 4-6, 1999 at the University of Washington by the University of W…
Little data exist on how twist changes the properties of high-performance continuous fiber yarns. For this reason, a study was conducted to determine the influence of twist on the strength and stiffness of a variety of high-performance continuous polymeric fiber yarns. The materials investigated include Kevlar 29®, Ke…
A novel partial discharge (PD) defect identification method is described. Starting with PD data on different families of specimens, a suitable set of parameters are determined and then used as input variables to a neural network for the purpose of identifying the defects within the insulation. In this procedure the st…
Low molecular weight Poly(ethylene glycol) (PEG) (< 20,000)-drug conjugates, prepared over a 20-year period, have been scrutinized and their properties and efficacy reviewed. No commercial products have thus far been reported for these types of compounds. However, during the past 5 years a renaissance in the field of…
The objective of this paper is to compare the performance of thyristor-controlled reactors (TCR) and shunt-connected PWM voltage source inverters (PWM-VSI) for compensation of flicker caused by arc furnaces. First of all, arc-furnace principles are presented in order to explain the main characteristics of the problem.…
Palladium(II)-supported hydrotalcite acts as a reusable catalyst for the oxidation of alcohols to aldehydes and ketones in the presence of pyridine under atmospheric pressure of oxygen.
Chemical-surface modification of coir fibers was done by dewaxing, using an alkali treatment (5% and 10% NaOH), vinyl grafting with methyl methacrylate (MMA) and cyanoethylation. The chemically modified fibers were characterized by Fourier transform infrared (FTIR) spectroscopy. In addition, the surface features of un…
The crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 Å resolution, respectively. The atomic models of the molecules were refined to the R factors 9.8 and 10%, respectively. The thr…