Materials Literature
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Lithographically designed two-dimensional arrays consisting of gold nanoparticles deposited on a smooth gold film are used as substrate to examine the SERS effect of the trans-1,2-bis (4-pyridyl) ethylene molecule. These arrays display two plasmon bands instead of the single one observed for the same arrays of particl…
Electron spin qubits in semiconductors are attractive from the viewpoint of long coherence times. However, single spin measurement is challenging. Several promising schemes incorporate ancillary tunnel couplings that may provide unwanted channels for decoherence. Here, we propose a novel spin-charge transduction schem…
We present a comprehensive study of the properties of the off-resonant conductance spectrum in oligomer nanojunctions between graphitic electrodes. By employing first-principle-based methods and the Landauer approach of quantum transport, we identify how the electronic structure of the molecular junction components is…
The electronic structure of Co/Cu(001) and Fe/Cr(001) magnetic multilayers has been investigated within the local density approximation combined with dynamical mean field theory. Our calculation shows enhanced density of states at the Fermi level, suggesting that electronic correlations might play an important role in…
We report an experimental study of a binary sand bed under an oscillating water flow. The formation and evolution of ripples is observed. The appearance of a granular segregation is shown to strongly depend on the sand bed preparation. The initial wavelength of the mixture is measured. In the final steady state, a seg…
The magnetic behavior of the Ca3Co2O6 spin chain compound is characterized by a large Ising-like character of its ferromagnetic chains, set on triangular lattice, that are antiferromagnetically coupled. At low temperature, T < 7K, the 3D antiferromagnetic state evolves towards a spin frozen state. In this temperature…
We propose a general theory of the spin-transfer effects that occur when current flows through inhomogeneous magnetic systems. Our theory does not rest on an appeal to conservation of total spin, can assess whether or not current-induced magnetization precession and switching in a particular geometry will occur cohere…
Buckling behavior of single-walled and multiwalled carbon nanotubes is studied under axial compression in this work. Brenner's ``second generation'' empirical potential is used to describe the many-body short-range interatomic interactions for single-walled carbon nanotubes, while the Lennard Jones model for the van d…
Abstract Summary: In this article we present some interesting properties of rodlike cellulose microcrystals (so‐called “whiskers”). These microcrystals can be obtained from different cellulose sources such as wood, cotton, or animal origin. When submitted to acid hydrolysis, the cellulose fibers yield stable aqueous s…
We address the velocity fluctuations of fastly moving cracks in stressed materials. One possible mechanism for such fluctuations is the interaction of the main crack with micro cracks (irrespective whether these are existing material defects or they form during the crack evolution). We analyze carefully the dynamics (…
Abstract This work investigates aqueous corrosion scenarios of industrial interest which induce hydrogen permeation through steel at 20-25 °C, and which are therefore amenable to hydrogen flux monitoring of steel corrosion at ambient temperatures. Initially, it was established that hydrogen flux exiting steel as a res…
Abstract The United States Navy operates and maintains over 300 ships and submarines in a highly aggressive marine environment. The corrosion of ship structures and shipboard systems and components in this environment is one of the biggest contributors to the Navy’s maintenance costs. This paper will provide an overvi…
Abstract During a pre-weld bakeout, hydrogen efflux was monitored in real time using the hydrogen collection method at high temperatures. A circular section of a 50 mm thickness alkylation unit acid storage vessel dome which had developed severe hydrogen blistering was removed, and pre-weld bake-out applied using heat…
Abstract Pipeline steel coupons were exposed in a model system containing Enterobacter aerogenes, Clostridium acetobutylicum and Desulfovibrio desulfuricans. After various exposure periods, the coupons were preserved, embedded and examined using phase contrast and UV fluorescence microscopy, transmission electron micr…
Abstract Onshore gas transmission lines are conjointly protected against external corrosion by cathodic protection (CP) and organic coatings. A coating may present defects such as holidays, rock indentation and/or disbondment. Those defects can generate a significant corrosion risk of the lines. The experiments hereby…
Abstract The formation brine in a giant carbonate reservoir had high total dissolved solids (more than 200,000 mg/L) and high calcium ion concentration (more than 25,000 mg/L). In an effort to assess compatibility with seawater and formation of sulfate scale, two types of field tests were conducted: 1) Seawater was di…
Abstract The localized corrosion behavior of Alloy 22 (N06022) in acidified (pH = 3) NaCl brines at elevated temperature (80°C) and under potentiostatic and open circuit conditions has been investigated. Both pitting corrosion and intergranular attack are observed on specimens polarized into the transpassive dissoluti…
Abstract Industrial cooling water systems will undergo more and more environmental constraints and the recycling of these waters will increase the risks of scale deposition and corrosion. The use of environmentally friendly chemical additives to inhibit these phenomena is necessary. Polyaspartates (PASP) have been pro…
Abstract A Fe-13Co-11Ni-3Cr-1Mo-0.2C steel alloy, processed for ultra-high strength and fracture toughness, exhibits three distinct hydrogen trap states in a complex precipitation hardened martensitic microstructure and is susceptible to severe hydrogen embrittlement (HE) at threshold stress intensity levels as low as…
Abstract The Big Escambia Creek Field is a gas/condensate field located in the southeastern United States that began production in 1974. The gas produced by the field contains about 40 percent CO2 and 20 percent H2S and the aqueous phase can contain as much as 200,000 ppm chlorides. Initially, these conditions combine…