Materials Literature
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The non-stoichiometry induced stress developed in the potential cathode material, Pr0.1Ce0.9O2-d (PCO), upon cooling from high temperature is modeled. Stresses can develop in such mixed ionic electronic materials due to changes in oxygen stoichiometry, resulting in defect induced dilation, or chemical expansion. In th…
Boron-doped hydrogenated amorphous carbon thin films were synthesized with plasma-enhanced CVD method. Electrochemical properties of B-doped DLC surface that can be useful in the application as an electrochemical sensor were investigated. B-doped DLC films deposited in this study possessed a B/C ratio of 0.013 and con…
The oxidation behavior of the Ni-30Pt-50Ti high temperature shape memory alloy is compared to that of conventional NiTi nitinol SMAs. The oxidation rates were ~1/4 those of NiTi under identical conditions. Ni-Ti-X SMAs are dominated by TiO2 scales, but, in some cases, the activation energy diverges for unexplained rea…
In this work, the applicability of localized electrochemical impedance spectroscopy (LEIS) to characterize metal-corrosion inhibitor systems has been investigated. Copper corrosion inhibition by benzotriazole (BTA) and 2-mercaptobenzimidazole (MBI) has been studied, and compared to the electrochemical behaviour of the…
Graft copolymerization of polyacrylamide onto gum arabic was carried out in aqueous medium at room temperature (30oC) using various initiator (ceric ion) and monomer (acrylamide) concentrations. The extent of graft copolymer formation was determined in terms of percentage graft yield. The results obtained showed that…
Despite its important contribution to the overall series resistance of a supercapacitor, little attention has been directed towards improving the performance of the separator. The present research examines the use of a number of commercially available materials as separators, and characterizes their performance under…
Short jute fibers and the pellets of polypropylene (PP) were compounded to make composites with the help of an extruder followed by compression molding. The mechanical properties of the composites increased with the increase of fiber content up to 20%, then decreased while the jute content varied from 5 to 30 wt%. Com…
The single-layer graphene usually aggregates and form irreversible multilayer graphene sheets due to the Van Der Waals interaction between the neighboring sheets, and the agglomeration leads to a substantial loss of effective surface area for graphene in the solid state. This affects the graphene's applications where…
A new series of two-arm ( MA1 , MA2 ), four-arm ( MA3 ) and six-arm ( MA4 ) chiral liquid crystalline compounds containing isosorbide as the chiral core were synthesised. Four precursors of branched-arm A1–A4 were first obtained, and then were esterised separately with isosorbide to obtain four chiral branched-arm liq…
The relaxations in maleic anhydride grafted polypropylene (PPgMAH) and its nanocomposite based on organically modified layered silicates were investigated using dynamic mechanical thermal analysis and dielectric relaxation spectroscopy. The results of dynamic mechanical thermal analysis showed that the incorporation o…
The effect of the molecular mass (Mm) of polyethylene glycol (PEG) and its derivatives on the copper island density (Np) on ruthenium-tantalum (RuTa) alloy was investigated by utilizing scanning electron microscopy (SEM) and galvanostatic methods. The experimental results show that the island density is affected by th…
Two-dimensional metallo-semiconductor networks have been fabricated by pulsed electrochemical deposition of Pt inside porous GaP membranes with parallel pores possessing diameters in the micrometer and sub-micrometer ranges. The electrochemical parameters were optimized for a uniform metal deposition on the inner surf…
Jute fabrics/polypropylene composites were prepared by compression molding. Jute fabrics were treated with red dye solutions (0.1–1%, w/w) for different soaking times and we found that 0.5% red-dye-treated jute/PP composite for 5 min soaking time showed better results. Gamma radiation (250-1000 krad dose) was applied…
Phosphate and nitrate doped Polypyrrole (PPy)/Aluminum (Al) flake pigments were synthesized by chemical oxidative polymerization method. Coatings were formulated from the phosphate doped PPy/Al flake pigment, nitrate doped PPy/Al flake, and as received Al flakes at 20% pigment volume concentration (PVC). The anticorro…
A coordinated experimental and modeling study of selected factors influencing intergranular corrosion (IGC) penetration depth into AA5083 is presented. Potentiostatic tests at -0.73 VSCE in 0.6 M NaCl solution were conducted on LT, ST, and LS surfaces of sensitized AA5083. The IGC penetration rate was found to depend…
The impact of sulphur-poisoning on the electrochemistry of anode-supported solid oxide fuel cells has been analyzed via electrochemical impedance spectroscopy. Therefore, single cells manufactured by Forschungszentrum Jülich (FZJ) were operated with a reformate fuel. During operation, contents of H2S (0.1 and 0.5 ppm)…
The in-vitro degradation behavior of poly(glycolic acid) (PGA) rods and the composite rods containing poly(L-lactic acid) (PLLA) were investigated via mass loss, pH value change, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Since the degradation rat…
Oxy-fuel combustion is based on burning fossil fuels in a mixture of recirculated flue gas and oxygen, rather than in air. An optimized oxy-combustion power plant will have ultra-low emissions since the flue gas that results from oxy-fuel combustion consists almost entirely of CO2 and water vapor. Once the water vapor…
Abstract Variations among silk of four African wild silkmoths, Argema mimosae , Anaphe panda , Gonometa postica , and Epiphora bauhiniae , was studied regarding their mechanical properties and thermal degradation behaviors. Cocoon shells and individual degummed fibers were examined using tensile testing, thermogravime…
In this work a set of simplified theories for predicting diffraction efficiencies of diffraction phase and triangular gratings are considered. The simplified theories applied are the scalar diffraction and the effective medium theories. These theories are used in a wide range of the value Λ/λ and for dif…