Materials Literature
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The dissolution of metals in acids is a heterogeneous electrochemical reaction, taking place at the interface between a solid and a liquid, described in terms of energy and configuration of the species involved. The energy of activation for two stainless steels in phosphoric acid was determined from their corrosion ra…
The present study is focused on the development of new SOFC cathode structures based on YSZ electrolyte and operating in the temperature range of 600-800oC. The corresponding cathode materials were manufactured from La0.8Sr0.2Fe0.6Ni0.4O3-δ and La0.8Sr0.2Fe0.6Ni0.4O3-δ/ Ce0.9Gd0.1O2 composites. Thin electrolyte diffus…
Abstract Anti‐corrosive composite cerium oxide/titanium oxide (CeO 2 /TiO 2 ) thin films were successfully prepared on an AZ91D magnesium alloy substrate by applying cerium oxide (CeO 2 ) thin films as the inner layer with a sol–gel process. Composition and surface morphology of the thin films were analyzed using X‐ra…
Bainite transitory formation, during the heating of a martensitic copper base SMA, was predicted by DSC and DTA and confirmed by XRD, OM and TEM only in hot pressed air cooled state homogenized and tempered at 573 K. In this heat treatment state, due to the pre-existence of α-phase, bainite amount is expected to…
A new varistor system based on terbium oxide is introduced in this paper. The ceramic samples were prepared using the standard ceramic method and sintered in air at 1300 °C for 2 h. From the I – V measurements, the samples exhibit varistor action with the nonlinear coefficient α = 3.9 and the breakdown voltage E b = 4…
Polyaniline(PANI)/polyvinyl chloride(PVC)/nylon fiber composites were prepared by the chemical oxidative polymerization of aniline using ammonium persulphate initiator by the in situ technique. The composites were then cast into films and doped with hydrochloric acid. The dielectric properties were investigated using…
Supramolecular assemblies consisting of CdS nanoparticles linked to I−3-encapsulated β-cyclodextrin and to π-donor–acceptor complexes reveal the generation of enhanced photocurrents as a result of effective charge separation. The donor–acceptor complexes formed lead to effective trapping of the conduction-band electro…
The purpose of this study is to clarify the relationship between ionic conductivity and phase transformation of zirconia system codoped with scandium oxide Sc2O3 and ytterbium oxide Yb2O3. Aiming to achieve high ionic conductivity as well as high mechanical strength, the authors have also investigated the relationship…
The effects of dynamic vulcanization on the process development and some properties, such as tensile properties, swelling index, gel content, crystallinity, and morphology, of the polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends were investigated. Dynamically vulcanized blends s…
The possibility of continuous nuclear fission chain reactions during four gigayears up to the present in the interior of the Earth is studied. Natural fast reactor in the form of lakes could be formed as a result of precipitation of uranium from the liquid layer on the solid Earth core. Mechanism of uranium concentrat…
Field-enhanced metal-induced solid phase crystallization (FE-MISPC) of amorphous silicon is scaled down to nanoscale dimensions by using a sharp conductive tip in atomic force microscopy (AFM) as one of the electrodes. The room temperature process is driven by the electrical current of the order of 100 pA between the…
Femtoliter capacity Ag cups formed by the pulsed laser ablation of an Ag foil have been tried out as substrates for surface enhanced Raman scattering (SERS) measurements. The cups are formed as the impinging droplets from the laser plume undergo a flow pattern before freezing into cup-like structures, resulting in a s…
N-grafted polyaniline with diglycidyl ether bisphenol A (DGEBA) was synthesized via anionic copolymerization technique. Metalation reaction was performed to cause grafting to occur between DGEBA with emeraldine salt polyaniline (PANI-ES) and leucoemeraldine base polyaniline (PANI-LEB), respectively. Fourier transform…
Polymer stabilisation of a state similar to a twist grain boundary phase is demonstrated. Layers of micrometre thick polymer networks are formed which exhibit discretely varying orientational order. The polymer network shows a high degree of orientational order with an order parameter of approximately S ≈ 0.8, which i…
Abstract Poly(octamethylene terephthalate) (POT), a semicrystalline aromatic polyester, is synthesized by melt‐condensation reaction, and its thermal property and crystal structure are investigated by using differential scanning calorimetry, X‐ray diffraction, and molecular modeling methods, respectively. It is reveal…
Hydrogen production via water splitting at 900{degree sign}C has been studied with mixed-conducting SrFeCo0.5Ox (SFC2) membranes. The hydrogen production rate increased with decreasing membrane thickness, but surface reaction kinetics began to dominate the behavior of thin (<1 mm) membranes without porous layers on…
From January to December 2004, monthly samples were collected from the mangrove salt marsh of J.U. Lloyd State Park, Florida, to examine the spatial and temporal distributions of heterotrophic diatoms in this subtropical region. Four non-pigmented (i.e. apochlorotic), heterotrophic diatom morphotypes were isolated fro…
Abstract This article presents experimental results and model predictions of the mechanical response of polymers during nonisothermal physical aging. The nonisothermal temperature history leads to a complex evolution in the aging behavior of the material. To characterize this response, sequential creep tests of polyet…
Malic enzyme (ME) is a family of enzymes that catalyze a reversible oxidative decarboxylation of l-malate to pyruvate with simultaneous reduction of NAD(P)(+) to NAD(P)H. According to the cofactor specificity, the mammalian enzyme can be categorized into three isoforms. The cytosolic (c) and mitochondrial (m) NADP(+)-…
The influence of precursor aggregation on materials deposition efficiency, film morphology, and macroscopic in-plane organization is explored for electrostatically self-assembled perylene-diimide/polyelectrolyte (PDI/PE) composites. PDI/PE thin films are prepared from aqueous precursor solutions by sequential dip-coat…