Materials Literature
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We study by means of molecular dynamics simulations of periodic shear cells, the influence of particle shape on the global mechanical behavior of dense granular media. Results at macro-mechanical level show that for large shear deformation samples with elongated particles, independent of their initial orientation, rea…
When insulator LaAlO3 is grown by epitaxy onto a TiO2-terminated {100} surface of insulator SrTiO3, the resulting system has a metallic character. This phenomenon has been associated with an electrostatic frustration at the interface, as {100} surfaces of SrTiO3 are neutral while those of LaAlO3 are polar, but its mic…
We have characterized the structural and magnetic properties of low-temperature molecular-beam epitaxy grown Ge:Mn by means of high-resolution transmission electron microscopy (HR-TEM), energy dispersive x-ray spectroscopy, and superconducting quantum interference device (SQUID) magnetometry. We find a coherent incorp…
We propose the expression ℓ0∕(ℓ0+L) for the energy transmission covering both ballistic and diffusive regimes, where ℓ0 is mean free path and L is system length. With this formula, calculations of thermal conduction in carbon nanotubes (CNTs) show: (1) Thermal conductance at room temperature is proportional to the dia…
The effects of phosphate (P) limitation, varying salinity (5–65 psu), and solid media growth conditions on the polysaccharides produced by the model diatom, Phaeodactylum tricornutum Bohlin were determined. Sequential extraction was used to separate polymers into colloidal (CL), colloidal extracellular polymeric subst…
The experimental investigation of the Casimir force between a large metallized sphere and semiconductor plate is performed using an atomic force microscope. Improved calibration and measurement procedures permitted reduction in the role of different uncertainties. Rigorous statistical procedures are applied for the an…
A detailed study of poly- and single crystalline samples of the normal spinel HgCr2S4 is reported. The structural refinement reveals enhanced values of the atomic displacements suggesting closeness to a structural instability. Magnetization, electron-spin resonance and specific-heat studies document strong ferromagnet…
The size dependence of the ferroelectric properties of BaTiO3 nanowires is studied from first principles. We show that the ferroelectric distortion along the wire axis disappears below a critical diameter of about 1.2nm. This disappearance is related to a global contraction of the unit cell resulting from low atomic c…
We have developed a shell model potential to describe PbTiO3 and PbMg1/3Nb2/3O3 (PMN) by fitting to first-principles results. At zero pressure, the model reproduces the temperature behavior of PbTiO3, but with a smaller transition temperature than experimentally observed. We then fit a shell model potential for the co…
It has been known that edge states of a graphite ribbon are zero-energy, localized eigen-states. We show that next nearest-neighbor hopping process decreases the energy of the edge states at zigzag edge with respect to the Fermi energy. The energy reduction of the edge states is calculated analytically by first-order…
Abstract Silver nanoprisms with strong absorption in the near‐IR have been synthesized using a modification of the photoinduced method by illuminating preformed silver seeds under different illumination conditions. Low‐intensity light‐emitting diodes and white light combined with different color filters are used as li…
Thermodynamics in Materials Science, Second Edition is a clear presentation of how thermodynamic data is used to predict the behavior of a wide range of materials, a crucial component in the decision-making process for many materials science and engineering applications. This primary textbook accentuates the integrati…
Utilizing terahertz time domain spectroscopy, we have characterized the electromagnetic response of a planar array of split ring resonators (SRRs) fabricated upon a high resistivity GaAs substrate. The measured frequency dependent magnetic and electric resonances are in excellent agreement with theory and simulation.…
Abstract Several years ago a new material was introduced for use as an interconnect material for solid oxide fuel cell (SOFC) application. This new material is designated UNS S44535 and it has unique properties that make it an ideal choice in application as an interconnect material. The key properties are the coeffici…
Abstract Procedures to reproduce Microbiologically Influenced Corrosion (MIC) initiation under controlled conditions and consistently define the extent to which microorganisms are involved in any resulting corrosion mechanism have yet to be defined for widespread application. The ability to reproduce and analyze MIC o…
Abstract Radioactive waste is stored in underground storage tanks at the Department of Energy (DOE) Savannah River Site (SRS). Recent experience has shown that steel not in contact with the bulk waste solution or slurry, but exposed to the “vapor space” above the bulk waste, may be vulnerable to the initiation and pro…
Abstract Titanium is the first material choice in the design of desalinization plants for producing pure water from sea water; these plants are an important industrial reality especially in the Gulf Area (e.g. Saudi Arabia) where the recent industrial growth lead to an increase of pure water demand. The most important…
Abstract The effect of Sulfate Reducing Bacteria (SRB) upon the cathodic protection of XL 52 steel was determined, in order to identify if the potential value of -0.950 V vs. Cu/CuSO4 is good enough to protect the metal surface. During the experiments, different operational parameters were monitored: H2S production, i…
Abstract Alloy 825, is a nickel base corrosion & heat resistant alloy. This alloy with austenitic matrix has been stabilized with Ti to prevent over production of chromium carbides. However, heating it to the temperature range between 650-800°C, called the “sensitizing” domain, causes chromium carbide precipitatio…
Abstract Pipeline quality gas is normally dried in Triethylene Glycol to reduce its water dew point to below the lowest operating temperature in a pipeline, and the presence of glycol as a vapor into the gas has been regarded as insignificant. This paper explores how TEG vapor can exist in a pipeline in a similar mann…