Materials Literature
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Polyurethane closed-cell rigid foams have been widely used as insulants in the building and refrigeration industry and also for district heating pipes. It is the special combination of excellent insulation performance and the mechanical stability due to the foaming process which makes this material very attractive for…
NiO/YSZ composite particles with 20 to 35 mol% Y2O3 stabilized ZrO2 (YSZ) are prepared by Spray Pyrolysis (SP) method. The NiO/YSZ composite particles are NiO particles coated with fine YSZ grains. The morphology of Ni/YSZ cermet anode fabricated from the composite particles is noticeably influenced by the YSZ content…
Alumina (Al2O3) particles fouled with bovine serum albumin (BSA) were cleaned with alkaline electrolyzed water and NaOH solutions of different pHs. The efficiency and rate of BSA desorption during batchwise and continuous cleaning with alkaline electrolyzed water depended on the solution pH, i.e., the hydroxide ion co…
Abstract Aging of oily soils produces difficult‐to‐remove yellow stains on fabrics. This study examines the effect of different textile substrates on yellowing and removal of aged oily soils. Model oily, squalene and artificial sebum, were aged at 40°C on cotton, nylon, and polyester fabrics for 8 wk. Radiotracer and…
The hydrogen absorption property of a Ti60Zr15Ni15Cu10 amorphous alloy is presented. The maximum hydrogen concentration of the amorphous alloy was 1.41H⁄M at room temperature. The hydrogen absorption at lower temperatures with higher H2 pressures favored higher H/M ratios for the amorphous alloy without any crystallin…
Czochralski silicon crystals, grown with different interstitial oxygen concentrations (group I) or different types of intrinsic defects (group II), were analyzed by X-ray section topography, diffuse X-ray scattering, surface photovoltage, microwave photoconductive decay, and Fourier infrared spectroscopy. The samples…
The polymer-polymer complexes [(PMAAN/PAAmM)c], composed of polymethacrylic acid [PMAAN, N=1(Mn=1.0×104), 2(Mn=5.0×103) and 3(Mn=2.5×103)] and polyacrylamide [PAAmM, M=1 (Mn=5.0×103) and 2(Mn=2.5×103)] were investigated as inhibitors for corrosion of mild steel in cooling water systems. The inhibition abilities of (PM…
Dynamic magnetic hysteresis modelling is of crucial importance in determining the electromagnetic behaviour of magnetic cores. Among the different models of magnetic hysteresis, Preisach model is one of the more commonly applied. The dynamic Preisach model is a generalisation of the static Preisach model, and is obtai…
The objective of this study is to improve the sliding wear resistance of the AZ91E magnesium alloy, by means of dispersion of hard particles on its surface. Two kinds of powder and injection methods were applied. SiC powder, fed by Ar gas stream, was injected directly into a melt pool formed by laser beam. And the hyp…
Copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) containing 50–80% former undergo a ferroelectric-to-paraelectric transition and then melt. The transition entropies determined by thermal measurements are shown to be consistent with the conformational entropies of the paraelectric and molten phases…
Production of bacterial cellulose by Acetobacter xylinum ATCC 10821 and 23770 in static cultures was tested from unamended food process effluents. Effluents included low-solids (LS) and high-solids (HS) potato effluents, cheese whey permeate (CW), or sugar beet raffinate (CSB). Strain 23770 produced 10% less cellulose…
The active clay (Saudi-bentonite) produced by the acid activation of Saudi natural clay was characterized with respect to chemical composition and physical properties. The obtained results were compared with commercial active clay being used in bleaching edible oils. Also, the adsorptive ability of clay to remove some…
Sapphire (Al2O3) single crystals were grown by the Czochralski technique both in air and argon atmospheres. The conditions for growing sapphire single crystals were calculated by using a combination of Reynolds and Grash of numbers. Acritical crystal diameter dc = 20 mm and the critical rate of rotation c = 20 rpm wer…
With the recent demands for higher fuel discharge burn up towards better fuel utilisation and higher heat ratings and coolant temperatures for better thermal efficiency, interest on corrosion of zirconium alloys has been rekindled even though a large amount of work has been carried out to understand various aspects of…
We have performed several experiments and molecular dynamics calculations to investigate a phase transition of titanylphthalocyanine phase Y crystal and the behavior of water molecules in the crystal. We have shown that water is in the crystal as well as on its surface and the humidity dependence of the photosensitivi…
Strong chemical reactions between metal and polymer substrates significantly enhance adhesion of the metal to the polymer. This study investigated the adhesion of three types of thin film metals, including Cu, NiCr, and Cr, to a fully epoxy-based polymer. Before depositing these thin film metals, the epoxy surface was…
The selection of a material-of-construction for any engineering component or system will have environmental implications. Minimally, the availability of, or demand for, a particular material for an envisioned design will necessitate the expenditure of energy to convert that material from its raw material form into the…
This paper deals with the simulation of skin effects in conducting materials in the time domain. The partial differential equations are discretized by a finite-difference method on a predefined grid resulting into an ordinary differential equation in time. Both equidistant and nonequidistant grids are compared and the…
It is shown that at elevated temperatures the conductance of an In/sub 2/O/sub 3/-modified Ga/sub 2/O/sub 3/ thin film depends significantly and reversibly on the ozone concentration in the ambient air. This ozone sensitivity is much greater than with pure Ga/sub 2/O/sub 3/ or In/sub 2/O/sub 3/ thin films, respectivel…
The optic tensor configurations (director profiles) in surface stabilized ferroelectric liquid crystal cells with homeotropic alignment are considerably simpler than in cells with the more conventional homogeneous alignment and, with the exception of thin surface regions, are essentially that of an unconstrained or “f…