Materials Literature
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Emittance spectra of the MgAl 2 O 4 spinel have been obtained up to 2500 K. Spectral analysis using a dielectric function model recently developed for amorphous materials allowed us to retrieve the inversion parameter over a very wide temperature range. The results are very close to the most recent published values. B…
It is shown that the magnitude of photostructural changes in chalcogenide glass is a function of the connectivity and fragility of the glass network. Glasses with a floppy network undergo larger photostructural changes, as shown by photorelaxation, photoexpansion and photodarkening measurements. The increasing magnitu…
Recent experiments on polycrystalline Co1−xFexS2 demonstrated composition control over the spin polarization by Fermi level manipulation. We report here the growth and characterization of CoS2 single crystals with fine control over the stoichiometry by chemical vapor transport. At the ideal Co:S atomic ratio we observ…
Li 4 B N 3 H 10 has been synthesized recently from LiNH2∕LiBH4 mixtures and its crystal structure determined. We have calculated the electronic structure of this complex hydride and investigated its thermodynamic stability and decomposition energetics. We find that its enthalpy of formation is −708kJ∕mole with respect…
Simultaneous size and shape control of zinc selenide (ZnSe) nanostructures was achieved using lyotropic liquid crystal templates formed by the self-assembly of an amphiphilic block copolymer in the presence of water and a less polar organic solvent. ZnSe quantum dots, hollow nanospheres, nanotubes, and nanolaminates (…
This letter reports on a simple, easy method for generating suspended nanofibers on a dielectric substrate using various target electrodes. By controlling the electrostatic field between the target electrodes, the nanofibers can be oriented to the electric field direction at the electrodes. The alignment of nanofibers…
A theoretical and experimental study of magnetic metamaterials with unit cells containing two resonant elements is presented. The properties of these structures, consisting of split rings, are governed by strongly anisotropic magnetic coupling between individual elements. This coupling leads to propagation of slow mag…
Ab initio computational studies were performed for CdSe nanocrystals over a wide range of sizes and topologies. Substantial relaxations and coordination of surface atoms were found to play a crucial role in determining the nanocrystal stability and optical properties. While optimally (threefold) coordinated surface at…
We propose to apply plasma in liquid to replace gas-phase plasma because we expect much higher reaction rates for the chemical deposition of plasma in liquid than for chemical vapor deposition. A reactor for producing microwave plasma in a liquid could produce plasma in hydrocarbon liquids and waste oils. Generated ga…
Starting from Newton's equations of motion, we derive a dynamical density functional theory (DDFT) applicable to atomic liquids. The theory has the feature that it requires as input the Helmholtz free energy functional from equilibrium density functional theory. This means that, given a reliable equilibrium free energ…
Dislocation behavior inside the very small grains of nanocrystalline metals has so far eluded high-resolution transmission electron microscopy (TEM) examinations. We have identified full dislocations using high-resolution TEM, and the different ways they reside in the 20–30nm Ni grains. The thermally activated propaga…
Electrical transport properties of thin boron doped nanocrystalline diamond films with thicknesses of 60–500nm have been studied. The Raman spectra measured exhibit Fano resonances, characteristic for B concentrations close to the metal-to-insulator transition. Upon increasing the B concentration, the sp2 carbon relat…
The enzymatic kinetics of glycoside hydrolase family 7 cellobiohydrolase (Cel7A) towards highly crystalline celluloses at the solid-liquid interface was evaluated by applying the novel concept of surface density (rho) of the enzyme, which is defined as the amount of adsorbed enzyme divided by the maximum amount of ads…
Abstract The cohesive element approach is getting increasingly popular for simulations in which a large amount of cracking occurs. Naturally, a robust representation of fragmentation mechanics is contingent to an accurate description of dissipative mechanisms in form of cracking and branching. A number of cohesive law…
Gold-nanoparticle-based miniaturized laser-induced fluorescence probe for specific DNA hybridization detection: studies on size-dependent optical properties, Kim, Chan Kyu, Kalluru, Rajamohan R, Singh, Jagdish P, Fortner, Angela, Griffin, Jelani, Darbha, Gopala K, Chandra Ray, Paresh
The large-scale synthesis and characterization of Ni-core/Ag-shell (Ni@Ag) nanoparticles by the successive hydrazine reduction of nickel chloride and silver nitrate in ethylene glycol using polyethyleneimine (PEI) as a protective agent are described. The resultant Ni@Ag nanoparticles had a mean core diameter of 6.2 nm…
The ${E}_{u}$ mode of the isotope-induced ferroelectric strontium titanate ${\mathrm{SrTi}}^{18}{\mathrm{O}}_{3}$ shows a perfect softening at the ferroelectric phase transition temperature ${T}_{c}$, where the frequency of the underdamped mode approaches completely to zero within the instrumental resolution. The spec…
A technique for the writing of crystal line in glass has been developed, in which a continuous-wave Nd:YAG laser (wavelength: λ=1064nm) is irradiated to the glasses containing transition metal (TM) ions such as Fe2+, Ni2+, and V4+. Laser energies are absorbed through d-d transitions of TM ions and dissipated to the la…
Plastic deformation was observed in damascene Cu interconnect test structures during an in situ electromigration experiment and before the onset of visible microstructural damage (voiding, hillock formation). We show here, using a synchrotron technique of white beam x-ray microdiffraction, that the extent of this elec…
Superhydrophobic surfaces are known to exhibit reduced viscous drag due to "slip" associated with a layer of air trapped at the liquid-solid interface. It is expected that this slip will lead to reduced turbulent skin-friction drag in external flows at higher Reynolds numbers in both the laminar and…