Materials Literature
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A transition state theory based predictive model is developed for the tensile failure of carbon nanotubes (CNT's). We show that the tensile yield strain has linear dependence on the activation energy and the temperature, and has a logarithmic dependence on the strain rate. Based on the parameters fitted from strain ra…
PURPOSE: To investigate and compare the effect of three analytical methods, hydrogen bromide titrimetry (HBr titrimetry), infrared spectroscopy (IR spectroscopy), and first derivative UV-spectrophotometry (FDUV-spectrophotometry) in the determination of degree of deacetylation (DD) of chitosan. METHODS: Three differen…
The failure of individual multiwall carbon nanotubes during field emission and two-probe characterization was studied in a scanning electron microscope on emitters grown by chemical vapor deposition. The failures induced by high currents during two-probe measurements led to a sundering of the tube in or near its middl…
We use first-principles density functional theory to calculate the phonon frequencies, electron localization lengths, Born effective charges, dielectric response, and conventional electronic structures of the IV-VI chalcogenide series. The goals of our work are twofold: first, to determine the detailed chemical compos…
Multiple quantum well nanorods have been fabricated via heteroepitaxial growth of ZnO and ZnMgO (see Figure and also cover). Simple yet accurate thickness control allows the realization of nanosized well structures in individual nanorods that are tunable through the effects of quantum confinement. This approach should…
Substituted hexabenzocoronenes (HBCs) form films with supramolecularly ordered columnar stacks that are uniaxially oriented onto poly(tetrafluoroethylene) alignment layers (see Figure). In field‐effect transistor (FET) tests, mobilities of up to 10 –3 cm 2 V –1 s –1 and high on–off ratios of more than 10 4 were derive…
Ideally, rationally designed tissue engineering scaffolds promote natural wound healing and regeneration. Therefore, we sought to synthesize a biomimetic hydrogel specifically designed to promote tissue repair and chose hyaluronic acid (HA; also called hyaluronan) as our initial material. Hyaluronic acid is a naturall…
Abstract To assess corrosion in buried metallic pipelines that are coated and under cathodic protection, an algorithm is proposed. This algorithm that is called “Corrosion Assessment Algorithm” or briefly CAA, can be regarded as a modification of Frank & Morgan risk analysis. By using CAA, one can both calculate t…
Abstract Jet fuel is frequently contaminated with microorganisms that can cause corrosion of fuel tanks. The purpose of this work was to survey the microorganisms currently found in sump water and biofilms of aluminum alloy 2024 (AA2024) fuel tanks containing JP-8 jet fuel. Aerobic and anaerobic bacteria were found in…
Abstract Austenitic stainless steels can become susceptible to intergranular corrosion due to inappropriate heat treatments. Therefore the potentiostatic Electrochemical Reactivation Test (ERT) has been developed at the Department of Ferrous Metallurgy of Aachen University. This electrochemical test method is fast, no…
Abstract Binary corrosion inhibitors consist of two components that are mixed on-site prior to application. The two components when applied to the metal surface produce high performance, extended-life films. Commercial inhibitors have been developed for oil producing pumping wells and hot gas wells several years ago t…
Abstract In general, the hydrocarbon transporting pipelines are protected against external corrosion using coatings and with cathodic protection systems. However, even with this protection, there have been some failures due to external corrosion. The soil and environmental factors can be very important, because they m…
Abstract This paper covers the execution of a series of field tests at gas well locations in the Netherlands. The objectives were to determine to what flow velocity the gas production can be increased without jeopardizing the integrity of the surface facilities and to establish the optimum corrosion inhibitor injectio…
Abstract In the oil and gas production environments, the corrosivity of produced water depends on the nature of the dissolved substances. The mitigation of corrosion of carbon steel in the presence of CO2, H2S and elemental sulfur was investigated in this study. Laboratory autoclave tests were conducted to study the e…
6-(2-Cyanoethylamino)-6-deoxycellulose (Cell-CEA) as a novel cellulose derivative was prepared from 6-bromo-6-deoxycellulose. The influence of the reaction conditions on the degree of substitution was studied in detail. The dielectric characteristics of a Cell-CEA sample having degree of substitution of 0.86, together…
Abstract A general model for predicting the occurrence of localized corrosion in chemical process streams is described. The model predicts the repassivation and corrosion potentials based on input chemistry of a system. The model predictions are compared to experimental data. Initial data from a validation study using…
Abstract We investigated several steels containing up to 5% chromium (Cr) with respect to their carbon dioxide (CO2) corrosion resistance in oil and gas environments. Steels containing 3% or more Cr showed improved corrosion performance compared to Cr free steels in a wet CO2 environment. This phenomenon was made clea…
Abstract This paper presents an overview of the continuing critical problem of corrosion under thermal insulation and also corrosion under fireproofing. Fireproofing (or fire resistant coatings) are applied to thermally protect structural steel and vessels in the event of a fire. Specifically the fire protective mater…
Abstract The corrosion behavior of super 13Cr stainless steels in completion fluids was investigated using well components(tubing, blast joint, sliding sleeve device and packer mandrel) retrieved from Resak A-6 well in Malaysia. The environment that caused the cracking in the Resak A-6 well was CaCl2 brine (completion…
Abstract This work is a comprehensive study of microbiologically influenced corrosion (MIC) of carbon steel in soil environments, induced by sulfate-reducing bacteria (SRB). Four experimental phases were involved in this research: (1) field study, (2) anaerobic corrosion study, (3) localized corrosion study, (4) mathe…