Materials Literature
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The Fragment Hamiltonian (FH) model is introduced as the basis for a new class of atomistic potentials that may be viewed as generalizations of the embedded atom method (EAM) and related atomistic potentials. Many metals and alloys have been successfully modeled by this method and other related methods, but the nature…
A broadband omnidirectional absorber which is realized by heterostructures containing a collision plasma layer and a zero − n̅ mirror is theoretically investigated. A collision plasma layer and an appropriate dielectric layer are put on the top of the PC. It is shown to absorb roughly 70% of all available electromagne…
We examine heat transport carried by acoustic phonons in the systems composed of nanoscale chains of masses coupled to two thermal baths of different temperatures. Thermal conductance is obtained by using linearized Landauer-type formula for heat flux with phonon transmission probability calculated within atomistic Gr…
The monolithic integration of thermoelectric generators and magnetoresistive functionality on the basis of misfit cobaltate [Ca2CoO3]0.62[CoO2] thin films into silicon technology is a prerequisite for their application in miniaturized electric circuits. Here, we report on [Ca2CoO3]0.62[CoO2] thin films grown by pulsed…
Polyurethane (PU) foam is used for many automotive applications with the benefits of being lightweight, durable, and resistant to heat and noise. Applications of PU foams are increasing to include non-traditional purposes targeting consumer comfort. An example of this is the use of PU foam between the engine and engin…
The nanopore arrays were fabricated by a two-step anodization of aluminum in an aqueous solution of 0.3 M oxalic acid at the temperature of 6 °C by applying a constant direct current (DC) of 40 V. A template-assisted synthesis of Co nanowire arrays was carried out by electrodeposition into the pores of prepared AAO te…
Abstract Rutheniumcluster Run+ (n=2–6) in der Gasphase werden als Modellsysteme verwendet, um den Ursprung der außergewöhnlichen Eigenschaften trägerfixierter subnanometergroßer Rutheniumpartikel bei der katalytischen CO‐Methanisierung mit Bezug zur Wasserstoff‐Prozessgasreinigung für hochentwickelte Brennstoffzellena…
Valence band spectra (VBS) and its modification across Curie temperature (TC) of Sr2CoO4 thin film are studied using resonant photoemission spectroscopy. It is found that VBS mainly consists of hybridized states of Co-3d t2geg and O-2p; however, Co-3d eg states show its prominence only in the ferromagnetic temperature…
L’hydrotalcite Mg 2 Al-CO 3 (HT) contenant des anions carbonates intercalés a été synthétisé par la méthode de coprécipitation. Afin de connaître les différentes propriétés structurales et texturales du matériau synthétisé, diverses techniques physicochimiques ont été utilisées, à savoir la diffraction des rayons X (D…
We model electrochemical kinetics and physical conduction mechanisms for carrier transport in electrolyte membranes to determine the limits of dimensionality reduction (down to 1 nm) on maximum power output of solid oxide fuel cells with symmetric Pt electrodes. Using Y-doped ZrO2, we find a minimum thickness of ∼6 nm…
Etching agents, including methylamine (MA) and several others, are used in many studies for exposing the crystal assembly in contrast to amorphous domains in polymer samples, for better morphology contrast. The selection of etching agents must be careful, so as not to alter the original chemical and crystal nature; ot…
A scheme of identification of scattering mechanisms in epitaxial graphene (EG) on SiC substrate is developed and applied to three EG samples grown on SiC (0001), (112¯0), and (101¯0) substrates. Hall measurements combined with defect detection technique enable us to evaluate the individual contributions to the carrier…
In the present work, the local order of Zr in ZrO 2 –CeO 2 nanopowders (with 50, 65, 70, and 90 mol % CeO 2 ) was studied by extended X-ray absorption fine structure around the Zr K-edge. In the cases of ZrO 2 –50 and 65 mol % CeO 2, we studied how the local order is affected by the phase transition at high temperatur…
Abstract This paper discusses the results of an on-going investigation to rank the hydrogen embrittlement susceptibility of precipitation strengthened Ni-based superalloys using a rising step load (RSL) technique in four-point bending. Alloys characterized include UNS N07716, UNS N09925, and UNS N07718 heat treated to…
We investigated structural and magnetic properties of CuO-Cu2O heterostructures obtained by high-temperature annealing of copperplate. In samples synthesized at 900 °C, an antiferromagnetic alignment phase was found at the Neel temperature TN = 600 K in fields greater than 20 Oe. At lower fields, diamagnetic alignment…
Isostatically pressed dense reaction‐sintered zirconia–mullite composites were prepared from zircon flour and reactive alumina with different proportions of M g O and C a O additives. The pressed compacts were sintered at elevated temperatures with variable soaking times. Development of different phases and microstruc…
Abstract A novel approach, via the use of a blowing agent (BA), to enhance clay exfoliation in polymer nanocomposites is reported. A commercial organoclay was treated with a common low‐cost BA, which was then melt‐processed with polymers in an extruder. The characterization results revealed that the degrees of exfolia…
Ln(IO3)3 (Ln = Ce, Nd, Eu, Gd, Er, Yb) polycrystals were hydrothermally synthesized using lanthanide nitrate or lanthanide oxide and iodic acid as precursors. X-ray diffraction was used to characterize the crystal structures of the Ln(IO3)3 products. Scanning electron microscopy was carried out to observe the microsco…
We have performed ab initio density functional theory calculations, incorporating London dispersion corrections, to study the absorption of molecular hydrogen on zigzag graphene nanoribbons whose edges have been functionalized by OH, NH2, COOH, NO2, or H2PO3. We find that hydrogen molecules always preferentially bind…
Loss of skeletal muscle tissue caused by traumatic injury or damage due to myopathies produces a deficit of muscle function for which there is still no clinical treatment. Transplantation of myogenic cells, themselves or combined with materials, has been proposed to increase the regenerative capacity of skeletal muscl…