Materials Literature
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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…
The phase transitions in series of crystals with the general formulas A2BB’X6 (X=F, Cl, Br, or CN) and Pb2BB’O6 that belong to the elpasolite family (space group $$Fm\bar 3m$$ ) are analyzed. The influence of the size and the shape of cations and anions on the entropy and the mechanism of structural distortions is dis…
Novel segmented polyurethanes (SPUs) have been synthesized using hydrolyzed cellulose triacetate (HCTA) and 1,4-butanediol (BD) as diol component. By altering the molar ratio of HCTA to diphenylmethane diisocyanate (MDI), a series of polymers having poly(butadiene) (PBD) diol soft segments and varying content of HCTA…
Al2O3-coated graphite powder was prepared by a sol-gel method using ethyl acetoacetate aluminium diisopropoxide. An Al2O3-C castable refractory was prepared from the Al2O3-coated graphite powder. The flowability of this castable refractory was higher than that prepared from a graphite powder. The apparent porosity of…
Previously derived equations connecting the mechanical properties of plain woven fabrics with their geometrical parameters are introduced, and used to generate relations among the mechanical properties. One of these suggests a method of estimating the real shear modulus of the fabric, and this leads to a discussion of…
The macroporous PS–DVB resin was prepared in the laboratory by suspension polymerization using gelatin as stabilizer and toluene as porogen. This is subsequently nitrated by a mixture of NO and NO2 (called NOx) in a gas phase reaction, and the carbon–nitrogen covalent bonding has been demonstrated by modified Laissagn…
The generally accepted view that phosphonate derivatives are more potent than the analogous carboxylates as crystal growth modifiers for barium sulfate has been systematically studied by using trifunctional molecules varying from the triphosphonate through to the analogous tricarboxylate; the results suggest that pred…