Materials Literature
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Low-temperature specific heat (SH) has been measured in ${\mathrm{K}}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$ single crystals with ${T}_{c}=32$ K. The SH anomaly associated with the superconducting transition is moderate and sharp, yielding a value of $\ensuremath{\Delta}C/T|{}_{{T}_{c}}=11.6\ifmmode\pm\else\textpm\fi…
Ferromagnetic L10−MnGa thin films have been epitaxially grown on GaN, sapphire, and MgO substrates using molecular beam epitaxy. Using diffraction techniques, the epitaxial relationships are determined. It is found that the crystalline orientation of the films differ due to the influence of the substrate. By comparing…
Nanotechnology is a new and exciting branch of science which offers enormous potential for development of medicine and surgery. Gold nanoparticles (GNP) is just one of a variety of nano products which will be available for physician of the future. GNP will give us more effective treatments and diagnosis. We are able t…
The effects of Co addition on the properties of Ni8−xMn4Ga4Cox ferromagnetic shape memory alloys are systematically investigated by first-principles calculations. The formation energy results indicate that the added Co preferentially occupies the Ni sites in Ni2MnGa alloy. The total energy difference between the param…
Polycrystalline Mo9 cluster chalcogenides AgxMo9Se11 (3.4≤x≤3.9) have been prepared by powder metallurgy techniques, sintered by spark plasma sintering and characterized by x-ray diffraction. Their thermoelectric properties (electrical resistivity, thermopower, thermal conductivity) have been determined in the 300–800…
Results of ab initio molecular dynamics (AIMD), quantum mechanics/molecular mechanics (QM/MM), and classical molecular dynamics (CMD) simulations of Cm(3+) in liquid water at a temperature of 300 K are reported. The AIMD simulation was based on the Car-Parrinello MD scheme and GGA-PBE formulation of density functional…
CaAl-layered double hydroxide (CaAl-LDH) has recently been proposed as potential concrete hardening accelerators, because of the similarity in the AFm phase (a family of hydrated calcium aluminate phases) that occurs in hydrated cement. The applications of the promising materials require synthesis routes to be capable…
According to the DFT calculations, [1,2,5]thiadiazolo[3,4-c][1,2,5]thiadiazole (4), [1,2,5]selenadiazolo[3,4-c][1,2,5]thiadiazole (5), 3,4-dicyano-1,2,5-thiadiazole (6), and 3,4-dicyano-1,2,5-selenadiazole (7) have nearly the same positive electron affinity (EA). Under the CV conditions they readily produce long-lived…
Abstract Engineering a microstructure with multiple length scales has been proposed as a strategy to enhance the plasticity of nanostructured materials which otherwise lack extensive dislocation activity, and therefore low ductility. To that effect, various research groups have implemented this concept by promoting th…
We report $^{75}\mathrm{As}$ nuclear magnetic resonance studies on a very clean hole-doped single-crystal Ba${}_{0.68}$K${}_{0.32}$Fe${}_{2}$As${}_{2}$ (${T}_{\mathrm{c}}=38.5$ K). The spin-lattice relaxation rate $1/{T}_{1}$ shows an exponential decrease below $T\ensuremath{\simeq}0.45{T}_{\mathrm{c}}$ down to $T\ens…
Standard surface finish used in laboratory corrosion testing may not represent the 'as-delivered‟ internal pipe surface condition, which typically varies from 20 μm to 50 μm. Surface roughness is known to affect the hydrodynamic and mass-transfer boundary layer, thus influencing the corrosion mechanism and rate. The o…
The geometric and magnetic structures of small Pt(n) clusters (n = 1 - 5) supported on a graphene layer have been investigated using ab initio density functional calculations including spin-orbit coupling. Pt-Pt interactions were found to be much stronger than the Pt-C interactions promoting the binding to the support…
Various liquid-phase syntheses of CoO and Co3O4 nanoparticles have been studied. The experiments focus on two synthesis routes: the coprecipitation and the sol-gel methods combined with thermal decomposition. The effect of synthesis route, the type of precursors (cobalt nitrate/chloride) and precipitation agent (carbo…
We report the temperature dependent (100--300 K) conductivity of Berlin green and Prussian blue powders. The method of electronic conduction in vacuum dried Berlin green is identified as hopping of localized electrons and vacuum dried Prussian blue is reaffirmed as an insulator. The assignment of the conduction mechan…
Without the thorn: In polar solvents, cationic M12L24 nanocages slowly assembled into hollow spherical “blackberry” structures, the size of which could be tuned by changing the counterion concentration or solvent polarity. The self-assembly process showed similar kinetic and thermodynamic features to viral-capsid form…
After learning about the potential risks associated with various specific nanomaterials, concerns have been raised about adequacy of existing regulation in Europe and what should be done to address any potential regulatory gaps related to nanomaterials. Understanding the limitations of the current regulation in regard…
The minority carrier transport length is a critical parameter limiting the performance of inexpensive Cu2O–ZnO photovoltaic devices. In this letter, this length is estimated to be ∼430 nm for electrochemically deposited Cu2O by linking the cell’s carrier generation profile with back and front incident photon-to-electr…
We report on the thermal boundary conductance across structurally-variant GaSb/GaAs interfaces characterized by different dislocations densities, as well as variably-rough Al/GaSb interfaces. The GaSb/GaAs structures are epitaxially grown using both interfacial misfit (IMF) and non-IMF techniques. We measure the therm…
Due to the unique physical and chemical properties, nanosized cerium oxide (n-CeO2) has attracted considerable interest in many fields of research. The potential, the growing use and the mass production of n-CeO2 have stimulated research on their potential impact on the environment and human health. However, the toxic…
Photon emission from quantum dots (QDs) and other quantum emitters is characterized by abrupt jumps between an "on" and an "off" state. In contrast to ions and atoms however, the durations of bright and dark periods in colloidal QDs curiously defy a characteristic time scale and are best described by a power-law proba…