Materials Literature
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The study of liquid crystals gives rise to many fascinating but difficult mathematical problems. The purpose of this paper is to briefly summarize some recent advances, as well as to describe the present state of art of the theory of liquid crystals. For the static theory, we emphasis on the theory of defects and the…
Blend films were prepared by blending 4 wt% sodium alginate and 5 wt% gelatin aqueous solutions and dried at room temperature for 2 days to obtain the transparent films. Their structures and properties were studied by infrared (IR) spectra, wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), therm…
Various random copolyesters of 3-hydroxybutyrate and 3-hydroxyvalerate (PHBV) and 3-hydroxybutyrate and 4-hydroxybutyrate P(3HB-4HB) were used in the construction of biodegradable, implantable rods for the local delivery of antibiotics (Sulperazone and Duocid) in chronic osteomyelitis therapy. Drug loading, type of ac…
This paper presents a preliminary study of the development of stainless steel/polyester woven fabrics for electromagnetic shielding applications. To facilitate weaving of stainless steel wires and to reduce material costs, initially blended yarns of stainless steel and polyester staple fibers are produced by a ring sp…
Acrylamide/itaconic acid hydrogels in the form of rods are prepared by γ-irradiation of ternary mixtures of acrylamide/itaconic acid/water with 2.00–5.71 kGy γ-rays. Spectroscopic and thermal characterization of the copolymers were examined. Dynamic and equilibrium swelling behavior of superabsorbent acrylamide/itacon…
The present work aimed to study the transformation from as-cast structure of the Ti4Al-4V alloy, as a result of the Ti-6Al-4V recycling, after some rapid heat treatments based on martensitic reactions. The effects on mechanical properties were evaluated by Vickers hardness measurements, Charpy and monotonic tensile te…
The thermal conductivity, κ(T), of bulk single-wall carbon nanotubes (SWNT’s) displays a linear temperature dependence at low T that has been attributed to 1D quantization of phonons. To explore this issue further, we have measured the κ(T) of samples with varying average tube diameters. We observe linear κ(T) up to h…
Collagen II is the most abundant protein of cartilage and forms a network of fibrils extended by proteoglycans that enables cartilage to resist pressure. The surface of the collagen fibril serves as a platform for the attachment of collagen IX, growth factors, and cells. In this study we examined the mechanism of the…
The passive state on iron in EDTA (ethylenediaminetetraacetic acid, disodium salt) containing borate buffer solutions of pH 8.4 to 10.0 at ambient temperature has been explored using potentiodynamic polarization and steady-state techniques, including Mott-Schottky analysis. EDTA effectively suppresses the formation of…
A model is proposed for the propagation of corrosion pits in stainless steel under potentiostatic conditions. The model is based on the requirement of a near-saturated local chemistry in the pit and uses an equation previously formulated for the anodic dissolution kinetics in this environment. Salt film precipitation,…
A combination of mathematical modeling and experiments on single MnS inclusions was used to investigate the role of MnS inclusions on the initiation of pitting corrosion of 304 stainless steel. Isolation of single MnS inclusions in chloride-containing solutions with use of microcapillaries as electrochemical cells sho…
Catfehodic electrodeposition of zinc oxide is demonstrated using dissolved hydrogen peroxide as the oxygen precursor. Unlike molecular oxygen, is a very soluble compound in water and can consequently be used at high concentrations allowing high deposition rates. Unlike nitrate ions, the reduction reaction does not giv…
The energetic and structural properties of neutral magnesium clusters Mgn (n = 2 to 22 and selected clusters up to 309) are investigated by means of density functional theory. The small clusters of sizes n = 4, 10 and 20 show enhanced stability, which is in line with the predictions of the shell model. Larger clusters…
Partial discharge (PD) monitoring is an effective online predictive maintenance test for medium-voltage (MV) motors, MV generators, and MV switchgear at 4160 V and above, as well as other electrical distribution equipment. The benefits of online testing allow for equipment analysis and diagnostics during normal produc…
Time resolved luminescence spectroscopy and laser flash photolysis have been used to probe the energy transfer processes in the europium, neodymium and terbium complexes of ligand, 1. The ligand, chosen because of the high kinetic stability of lanthanide complexes derived from amide-functionalised azamacrocycles, bear…
Shape memory alloys recover deformations induced at lower temperatures after being heated above a transformation temperature; restraint of this shape recovery generates relatively large stresses. These stresses are used to transfer corrective forces to structural systems for strengthening and repair. For this purpose,…
Semi-crystalline fluorinated polymers represent an interesting class of high-performing, melt-processible materials. Structure–properties relationships are discussed at a molecular level starting from the atomic properties of the fluorine atom. Their synthesis and microstructure are reported in detail. Further focus i…
The oxidation behavior of dense TiB 2 specimens was investigated. Hot‐pressed TiB 2 with 2.5 wt% Si 3 N 4 as a sintering aid was exposed to air at temperatures between 800° and 1200°C for up to 10 h. The TiB 2 exhibited two distinct oxidation behaviors depending on the temperature. At temperatures below 1000°C, parabo…
A combined process of electropolishing, focused-ion-beam lithography, and controlled anodization is used to fabricate anodic alumina films with ordered nanochannels. The ion beam is used to create a hexagonally close-packed lattice of concaves on a polished aluminum surface and the concaves act as pinning points for g…
A tape casting method for fabricating solid-oxide fuel cells (SOFCs) that are active for the direct oxidation of dry hydrocarbons is presented. The method relies on the inclusion of pyrolyzable pore formers in the anode green tape in order to produce a porous yttria-stabilized zirconia anode matrix. Wet impregnation w…