Materials Literature
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The principles and methods of thermopower and electrical conductivity measurements at high temperatures (100 – 1000 K) are reviewed. These two properties define the so-called power factor of thermoelect ric materials. Moreover, in combination with thermal conductivity they give the efficiency of thermoelectric convers…
Abstract The effect that even small concentrations of H2S can have upon CO2 corrosion has been recognized since at least the 1940's. Early studies showed that the FeS corrosion products that were formed had an impact, but disagreed whether the impact was beneficial or not. Although H2S corrosion has not received the l…
Abstract Many airframe components contain complex geometries due to the fastening to adjacent structures. When exposed to marine environments, the geometries of these faying surfaces and fastener holes inherently aid in the trapping/wicking of the electrolyte into tight crevices typical of these component joining loca…
Abstract Multiphase flow seen in oil and gas lines can be very turbulent and its effect on corrosion has been debated for decades. However, the effect of turbulence and mechanical forces produced by flow on protective corrosion product layers and inhibitor films is not fully understood. Wall shear stress (WSS) is one…
Abstract Traditionally copper alloys, such as gunmetals and nickel aluminium bronzes, have been used for seawater cooling and firewater pumps. The drawbacks to these copper alloys are their susceptibility to erosion corrosion at high water velocities and to pitting in polluted waters containing sulphides. Austenitic c…
Abstract General and localized CO2 corrosion is influenced by a number of factors which can be divided into materials-related, environment-related and interface-related parameters. Materials-related parameters include alloy composition, microstructure and heat treatment. CO2 partial pressure, pH, solution chemistry, t…
Abstract In the present study, a comprehensive thermodynamic model, depicted by Pourbaix diagrams, has been developed with the relatively narrow focus on corrosion of mild steel in oil and gas field conditions. This thermodynamic model focuses on predicting the formation of metastable or stable corrosion products in s…
Abstract A novel experimental set-up was designed and built to investigate the effect of iron sulfide layer growth on H2S corrosion of carbon steel. Tests were conducted by purging 10% H2S/N2 into 1 wt.% NaCl solution at different temperature (25 °C-80 °C), different pH (pH 4 to pH 6) and different flow conditions (60…
It has been shown by an X-ray structural analysis that the amino acid residues Ala198, which are located in the coenzyme-binding domain of NAD(+)-dependent formate dehydrogenases (EC 1.2.1.2., FDH) from bacteria Pseudomonas sp.101 and Moraxella sp. C-1 (PseFDH and MorFDH, respectively), have non-optimal values of the…
We present tip-enhanced upconversion photoluminescence (PL) images of Er(3+)- and Yb(3+)-doped NaYF4 nanocrystals on glass substrates with subdiffraction spatial resolution. Tip-sample distance dependent measurements clearly demonstrate the near-field origin of the image contrast. Time-resolved PL measurements show th…
Copper/Copper oxide (Cu/Cu2O) nanoparticles were synthesized by modified chemical reduction method in an aqueous medium using hydrazine as reducing agent and copper sulfate pentahydrate as precursor. The Cu/Cu2O nanoparticles were characterized by X-ray Diffraction (XRD), Energy Dispersive X-ray Fluorescence (EDXRF),…
Silver nanoparticles (Ag NPs) have attracted much attention in the past decade because of their unique physicochemical properties and notable antibacterial activities. In particular, thiol-protected Ag NPs have come to the forefront of metal nanoparticle studies, as they have been shown to possess high stability and i…
Abstract A large number of CO2 dependent chemical, electrochemical and mass transport processes occur simultaneously on and close to the corroding steel surface. The various reactions respond differently to changes in CO2 partial pressure, temperature, water chemistry, flow and other operational parameters. Apparently…
Abstract CO2 corrosion has been recognized as a major problem in internal pipeline corrosion. In the presence of water, CO2 forms carbonic acid, a weak acid which partially dissociates as a function of pH and the solution temperature. According to many studies, the presence of CO2 and therefore, carbonic acid enhances…
This paper proposes a novel methodology to synthesize highly fluorescent gold nanoparticles (NPs) with a maximum quantum yield of 16%, in the near-infrared (IR) region. This work discusses the results of using our (previously developed) matrix sputtering method to introduce mercaptan molecules, α-thioglycerol, inside…
We demonstrate single atom anisotropic magnetoresistance on the surface of a topological insulator, arising from the interplay between the helical spin-momentum-locked surface electronic structure and the hybridization of the magnetic adatom states. Our first-principles quantum transport calculations based on density…
We performed a scanning tunneling microscopy and spectroscopy (STM/STS) study on the electronic structures of of root(3)Xroot(3)-silicene on Ag(111). We find that the coupling strength of root(3)Xroot(3)-silicene with Ag(111) substrate is variable at different regions, giving rise to notable effects in experiments. Th…
Using all atom molecular dynamics (MD) simulations, we have studied the mechanical properties of ZnS/CdS core/shell nanowires. Our results show that the coating of a few atomic layer CdS shell on the ZnS nanowire leads to a significant change in the stiffness of the core/shell nanowires compared to the stiffness of pu…
Exploration of environmentally friendly catalysts is important for acetylene hydrochlorination because the traditional HgCl 2 catalyst is highly toxic and harmful to human health. Herein, boron and nitrogen heteroatoms dually doped on oxide graphene (B,N-G) catalyst were synthesized using a model calcination method an…
Herein, we propose convenient routes to produce hybrid-polymers that covalently enclosed, or confined, N-doped carbon quantum dots (CQDs). We focus our attention on polyamide, polyurea-urethane, polyester, and polymethylmetacrylate polymers, some of the most common resources used to create everyday materials. These hy…