Materials Literature
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We report an epitaxial growth of graphene, including homo- and hetero-epitaxy on graphite and SiC substrates, at a temperature as low as ∼540 °C. This vapour-phase epitaxial growth, carried out in a remote plasma-enhanced chemical vapor deposition (RPECVD) system using methane as the carbon source, can yield large-are…
Abstract A study on effect of chemical treatment using maleic anhydride‐grafted polypropylene (MAPP) and 3‐aminopropyltiethoxysilane (3‐APE) was investigated. The performance of the MAPP and 3‐APE were investigated by means of torque development, mechanical properties, thermogravimetric analysis (TGA), differential sc…
Abstract The Pourbaix diagrams for an Fe-CO2-H2O system at elevated temperatures were constructed using thermodynamic theory and data and then correlated with observed CO2 corrosion phenomena of mild steel up to 250°C. In the range 80-150°C corrosion product layer formed and the surface analysis showed a mixture of cr…
Abstract Results from previous studies demonstrated that significant corrosion of carbon steel was observed when 1% SO2 impurity was contained in a supercritical CO2 phase in the presence of small amounts of water (650 ppm). Considering real situations for CO2 transportation pipelines, the effects of CO2 phase change,…
We describe a novel strategy for the fabrication of plasmonic nanopowders (dried gold nanoparticles) by using wet chemical nanoparticle synthesis, PEG-SH functionalization, and a standard freeze-drying technique. Our strategy is illustrated by successful fabrication of different plasmonic nanopowders, including gold n…
Abstract Over the past few years, under deposit corrosion (UDC) has been frequently cited by operators, corrosion engineers, failure forensic analysts, asset integrity authorities and Root Cause Analysis specialists as being a major player in different failures within the oil and gas operations. It has also been ident…
Abstract In the Oil & Gas industry, formation treatment with acids is an established method to stimulate carbonates or dissolve fines. Either organic acids such as citric or acetic acid or mineral acids such as HCl or HF are injected into the well at high concentrations. In the absence of corrosion inhibitors, the…
Abstract This research investigates the effect of exfoliated graphene nanoplatelets (GNP) on the crystallization behavior, thermal conductivity, and electrical conductivity of high‐density polyethylene (HDPE)/GNP nanocomposites. HDPE/GNP nanocomposites were fabricated by melt blending followed with injection molding.…
This paper investigated the feasibility of manipulating packaging polymers with various degrees of hydrophobicity to release two antioxidants, tocopherol and quercetin, at rates suitable for long-term inhibition of lipid oxidation in food. For example, one antioxidant can be released at a fast rate to provide short-te…
Abstract The effects of functionalized graphene sheets (FGSs) on the mechanical properties and strain‐induced crystallization of natural rubber (NR) are investigated. FGSs are predominantly single sheets of graphene with a lateral size of several hundreds of nanometers and a thickness of 1.5 nm. The effect of FGS and…
We theoretically study current dynamics of graphene nanoribbons subject to bias dc and ac driven fields. We showed that graphene nanoribbons exhibit negative high-harmonic differential conductivity. Negative differential conductivity appears when bias electric filed is in the neighborhood of applied ac filed amplitude…
Magnetic data storage is pervasive in the preservation of digital information and the rapid pace of computer development requires ever more capacity. Increasing the storage density for magnetic hard disk drives requires a reduced bit size, previously thought to be limited by the thermal stability of the constituent ma…
The phase behavior and kinetic pathways of Li1+xV3O8 are investigated by means of density functional theory (DFT) and a cluster expansion (CE) methodology that approximates the system Hamiltonian in order to identify the lowest energy configurations. Although DFT calculations predict the correct ground state for a giv…
This chapter is devoted to duplex stainless steels (DSSs). This chapter begins with an introduction to the different types of DSSs (ordinary, lean, superduplex and hyperduplex), their applications and compositions of the commonly used grades. Their typical microstructures and methods for phase prediction via different…
The irreducible spherical and Cartesian tensors built of the products of two interaction tensors: the second order tensor resulting from the product of two second order tensors $${{\sf T}_{\alpha\,\lambda}\,{\sf T}_{\lambda\,\beta}}$$ contracted once with the index λ, third order tensor $${{\sf T}_{\alpha\,\beta\,\lam…
The first experimental demonstration of lasing plasmonic nanoparticles in 2009 ignited interest in active plasmonic structures with optical gain. However, the understanding of lasing in plasmonic nanoparticles is largely incomplete, and even less is known about their characteristics as they are taken toward the lasing…
In situ formation of ligands is an efficient approach to synthesizing novel complexes with unique coordinating moieties. Oxazolidines and oxazinanes are 1,3-N,O-containing five-membered and six-membered heterocycles, respectively. Metal complexes of ligands derived from these two heterocycles are rather rare. In this…
Em artigo de revisão anterior[1], o processo de eletrofiação foi discutido, incluindo suas bases teóricas e experimentais, e a obtenção de diferentes nanofibras de materiais poliméricos. Neste segundo artigo de revisão, são abordados os aspectos relacionados à aplicação de materiais eletrofiados em diferentes áreas, c…
Abstract The mechanism of the aerobic oxidation of methanol to formic acid catalyzed by Au 8 − has been systematically investigated using density functional theory with the M06 functional. The reaction pathways were examined by taking into account the full structural relaxation of the Au 8 − . Stepwise and concerted r…
Duplex stainless steel exhibits a dual phase microstructure of austenite islands in a ferrite matrix. The oxidation characteristics of the phases depend on the composition within them. High temperature, in situ SEM observation of the growing oxide on a duplex stainless steel has shown differences in the morphologies o…