Materials Literature
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The microstructural evolution during sintering of Al 2 O 3 was investigated to determine the role of MgO additive, particularly when its concentration is very low (<200 ppm). Compared with specimens without MgO, a few Al 2 O 3 grains were observed to grow enormously after the addition of 50 or 100 ppm MgO. When MgO…
Abstract Cytocompatible polymers are of increasing importance for tissue engineering scaffolds and implanted devices. Polyurethane (PU) membranes were modified by grafting polymerization of methacrylic acid (MAA) initiated by UV light and further covalent immobilization of gelatin or arginine‐glycine‐aspartic (RGD) pe…
Abstract Structure‐properties relationships of composite materials, consisting of a polymer matrix and metal inclusions, is very important for designing new materials with desirable properties. In the present work the electrical and dielectric properties of several composites, consisting of a polymer matrix and iron (…
Absorption, emission and excitation spectra and luminescence decay kinetics of Na(K)GdCe, NaGdTb and NaGdMn phosphate glasses and their dependence on the temperature (in the 1.7–300 K range) and on the glass composition have been studied. The processes of energy migration through the Gd3+ ions and following energy tra…
Abstract Main mechanisms of tough response of polymers are described. In heterogeneous polymer systems due to mechanical misfit between heterogeneities and the matrix a high negative pressure (tri‐axial stress) is generated. The excessive negative pressure is the main reason of material cavitation. Cavitation appears…
Nanotechnology, a field few people had heard of a decade ago, is now the focus of a $750 million-plus U.S. government program, not to mention the subject of Michael Crichton’s latest bestseller. Scientists in this multidisciplinary field are creating new materials and devices with dimensions of 1 to 100 nanometers (bi…
Abstract Polycrystalline alumina substrates were dip-coated in dilute suspensions formed with dispersed, nano-silica particles. The fractional surface coverage of the alumina substrate was varied between ≈ 0.05 to ≈ 0.4 by changing concentration of particles in the silica slurry. After a heat treatment to partially si…
Abstract The corrosion behavior of steel in water from certain oil fields with various organic inhibitors was studied by applying potentiodynamic technique at pH 5.9. The inhibitors which were used include 2‐methylbenzimidazole (I), 2‐mercaptobenzimidazole (II), 2‐mercapto‐5‐methylbenzimidazole (III), and 2‐mercaptoth…
Moisture sorption isotherms of high amylose corn starch (HACS) films at 5, 25, 35 and 45 °C within an approximate water activity ( a w ) range of 0.11-0.85 were obtained using a static gravimetric method. HACS films fitted a type III BET model at all temperatures studied. Water sorption process in high amylose based f…
Presented are results of our ab initio study of the surface reconstruction and relaxation of (100) surfaces on bulk and nanocrystalline diamond. We have used a density functional theory (DFT) within the generalized-gradient approximation (GGA) via the parallel computer version of the Vienna ab initio simulation packag…
This paper describes the problem of correcting the results of no-load loss measurements of power transformers for the effect of distorted supply voltage waveform on the magnetic flux in the core and hence on both the hysteresis and eddy current loss components of core losses. Test data obtained during the no-load loss…
Abstract The reaction of the Si 8 O 20 8− silicate anion with X(CH 3 ) 2 SiCl (XH or CH 3 ) has been studied to develop a cost‐effective procedure for synthesizing Si 8 O 20 [Si(CH 3 ) 2 X] 8 in high yield. Use of hexane as solvent and adjustment of the reaction temperature to ca 20 °C were found to be effective in p…
Six methods for the numerical calculation of zero-order Hankel transforms of oscillating functions were evaluated. One method based on Filon quadrature philosophy, two published projection-slice methods, and a third projection-slice method based on a new approach to computation of the Abel transform were implemented;…
A new method was devised for the synthesis of 1,9-diacyldipyrromethanes - crucial intermediates in the synthesis of meso-substituted corroles and porphyrins with different substituents. The diacylodipyrromethanes formation involves acylation of dipyrromethanes with salts made in situ from POCl 3 and tertiary amides. T…
The length and width shrinkages, skewness, spirality and moisture content of three weft knitted cotton structures, plain single jersey, interlock and lacoste, were determined at regular intervals during tumble drying. Significant length and width shrinkages occurred in all three structures with the amount of shrinkage…
A problem encountered in patients undergoing long-term catheterization of the urinary tract is that of encrustation and blockage of the catheter by crystalline bacterial biofilms. This is principally caused by the action of the urease-producing pathogen Proteus mirabilis. A major aim of this work is to develop materia…
Abstract New polyimide foams and polyimide foam filled honeycombs are currently being developed at NASA, its licensee Sordal Inc. (USA) and Newmet (UK) under the trade name Solrex®. These materials are foreseen for Space, Aerospace, Maritime & Medicine applications. In this paper selected properties of these new m…
A new law for high-speed friction is presented in this paper. This law is based on observations made by several investigators regarding the asymptotic behaviour of sliding friction as the speed is increased. The new frictional effect is incorporated into the equations for rigid-body penetration to develop an analytica…
The pulsed electroacoustic (PEA) method is used to measure space charge distributions in insulating materials. A high-resolution PEA measurement system and signal procedure has been discussed in previous papers. Since the signal procedure is necessary for high-resolution measurement, the system must include a computer…
Nominally clean diamond surfaces have been shown to contain adsorbed foreign atoms on them. Some of the adsorbed atoms have also been known to lead to various surface modifications, a phenomenon that is important in diamond electronics. Establishing the identity and nature of the adsorbed atoms on these surfaces is th…