Materials Literature
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This paper studies band-to-band tunneling in the transverse and lateral directions of van der Waals MoS2/WSe2 heterojunctions. We observe room-temperature negative differential resistance (NDR) in a heterojunction diode comprised of few-layer WSe2 stacked on multilayer MoS2. The presence of NDR is attributed to the la…
Superóxido dismutases (SODs) são metaloenzimas que convertem o ânion superóxido em oxigênio molecular (O2) e peróxido de hidrogênio (H2O2). A presença de metal nessas enzimas está diretamente relacionada com seus mecanismos de catálise e com suas estruturas tridimensionais. Evolucionariamente, FeSOD e MnSOD podem ter…
Abstract A new acrylic epoxy hybrid (AEH) water based dispersion has been developed for two-components coating applications for several years. This new AEH dispersion can be used to replace the conventional water based epoxy dispersions for concrete and metal coatings. The curing agent selection for the new AEH disper…
Abstract Inorganic zinc-rich coatings (IOZ’s) are often considered the gold standard for corrosion protection in atmospheric environments. Frequently, zinc epoxy coatings are considered second best among the most effective coatings for corrosion protection. However, current zinc-rich coating technology is not exempt o…
When coatings are applied to substrates as e.g. metal, the adhesion of the cured paint is a critical parameter for the final performance of the paint film. The adhesion of the paint to the substrate influences many properties of the paint, which including visual appearance, anticorrosive performance, flexibility, resi…
Abstract The U.S. Army Corps of Engineers owns and operates the vast majority of the countries lock and dam structures for inland navigation. The large steel gates on these structures are subjected to a severe impact and abrasive environment while in immersion by debris such as timber, ice, steel drums, etc. High VOC…
Abstract Carbon nanotubes are well-known for their ability to improve critical properties of polymeric materials. Our research objective is to quantify the influence of incorporating multi-walled carbon nanotubes (MWCNT) modified with amine, hydroxyl, or epoxy functionalities on the corrosion performance of epoxy amin…
The 2014 US bridge inventory lists over 610,000 highway bridges. Industry experts believe that the cost of maintaining those bridges for repairs due to corrosion is at least $30 billion annually. Bridge owners do not have the resources to maintain bridges in good condition. New bridges are being constructed, at the ra…
Protective coating systems provide the primary corrosion protection for assets in sea water. Protective coating systems are defined as a specific combination of surface preparation and coating material applied under specified conditions to a specific structure. Over the past many years, the paint industry has focused…
Internal coatings stress (ICS) develops in coatings applied to a rigid substrates. During drying, volume changes due to solvent loss and/or cure induces stresses in the films. Differences in the thermal expansion coefficients of the coating and substrate also affect the ICS1. ICS affects the interfacial adhesion and r…
Abstract Solventborne alkyd resins are widely used in industrial coatings because of their excellent gloss, good adhesion and wetting properties as well as excellent compatibility with other resin types. In many regions, however, the consumption of alkyds is diminishing as stringent environmental regulations drive the…
Common methods of maintenance painting have either involved complete removal of existing paint (e.g., SSPC-SP 10, Near White Blast Cleaning) or highly localized preparation of corroding areas using power or hand tools (e.g., SSPC-SP 2 or SSPC-SP 3). Sometimes projects may be designed to an intermediate level where the…
Abstract A unique project was completed in Mid-2014 at the Powerhouse #3, Turbine Unit #23 refurbishment, Grand Coulee Dam, located in Washington State. The project scope includes a complete overhaul of the turbine bearings, windings and critical components. As part of the overall scope, the contractor was charged wit…
Abstract Wind has been used as an energy source for centuries. Although the first wind turbines were built at end of the 19th century, the modern wind power industry, as we know it today, didn’t emerge until a century later. Today these wind turbines have an expected lifetime of up to 25 years. In addition they are of…
Abstract During the winter of 2013-2014, Northern California experienced unusually cold temperatures (below 40°F). These low temperatures delayed Pacific Gas & Electric Company (PG&E) coating operations on new pipelines. Since liquid epoxy coatings capable of being applied at, or which fully cure at, temperatures belo…
abstract The techniques used to measure, design, and test Radar Absorbing Materials (RAM) are described. Absorbing additives are added to polymer materials at a range of concentrations in the laboratory, and then tested over the frequency range of interest to determine the material’s permittivity and permeability. The…
Abstract The United States Army and Marine Corps (USMC) paint their vehicles with the Chemical Agent Resistant Coating (CARC) system. This system consists of a pretreatment, an epoxy primer, and polyurethane topcoat, similar to many other industrial paint systems, but with added functional requirements (e.g., chemical…
Abstract Fluorourethane coatings based on FEVE, fluoroethylene vinyl ether chemistry, have been used globally for over 30 years. This technology has a proven record of outstanding performance against exposure to the elements and has been used in applications ranging from aerospace to architectural structures. Recently…
Abstract Fabricators and Construction Firms rely on sub-tier vendors to supply a vast array of components and equipment for integration into the products they are supplying their clients. This may include valves, engines, motors, power supplies, tanks, tubs, vessels and other numerous items. The items and components p…
Abstract Translational Corrosion Science, the subject of the SSPC 2015 presentation by the Department of Defense Corrosion (DoD) Prevention and Control Program, is a science-based process to accelerate the development and application of high-quality solutions to difficult material degradation problems, and to do so mo…