Materials Literature
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The field identity of the long-range surface plasmon (LRSP) mode in an asymmetric metal dielectric structure is elucidated and it is shown that it can be pictured as having a zero crossing of the longitudinal electric field at the middle of the metal film. A parametric dependence between the metal and the dielectric l…
Silver clusters with size ranging from a few nanometers to several nanometers are formed in zirconia matrix and have been characterized by low frequency Raman scattering (LFRS), transmission electron microscopy (TEM) and X-ray diffraction (XRD) studies. Surface acoustic vibrational modes of the Ag nanoclusters are obs…
We studied the temperature dependence of the stress-strain hysteresis in [N(CH 3 ) 4 ] 2 CuCl 4 and [N(CH 3 ) 4 ] 2 ZnCl 4 single crystals grown by the slow evaporation method. From the obtained results, we determined that [N(CH 3 ) 4 ] 2 CuCl 4 and [N(CH 3 ) 4 ] 2 ZnCl 4 single crystals have ferroelastic characterist…
The ionic conductivity in liquid Ag–Se and Ag–Te systems has been measured using a residual potential technique. The ionic conductivity in the liquid Ag–Se system exhibits a local maximum at the stoichiometric composition of Ag 2 Se. This maximum decreases rapidly with increasing temperature. The liquid Ag–Te system h…
Aminoacylase was identified in cell extracts of the hyperthermophilic archaeon Pyrococcus furiosus by its ability to hydrolyze N-acetyl-L-methionine and was purified by multistep chromatography. The enzyme is a homotetramer (42.06 kDa per subunit) and, as purified, contains 1.0 +/- 0.48 g-atoms of zinc per subunit. Tr…
We consider the adsorption of a semiflexible polymer chain onto interfaces and surfaces by using the differential equation of the distribution function G(R,L) of the end-to-end distance R, which is associated with the moment expansion of the latter. We present the results of the approximative treatment consisting of t…
Instead of the conventional flat collimator a curved collimator was used in double-crystal x-ray topography. The curvature of the collimator was adjusted so that the Bragg condition for x-ray diffraction was uniformly satisfied over a wide area of the silicon wafer. The image area of the wafer was wide enough to chara…
The complete Bacillus subtilis genome contains four genes (proG, proH, proI, and comER) with the potential to encode Delta(1)-pyrroline-5-carboxylate reductase, a proline biosynthetic enzyme. Simultaneous defects in three of these genes (proG, proH, and proI) were required to confer proline auxotrophy, indicating that…
We have studied theoretically the effect of an external electric field on the equilibrium properties of lamellar and cylindrical assembly in confined diblock copolymers. The critical electric field at which a vertical morphology of lamellae is preferred over a horizontal configuration is found to have only a weak expl…
Scanning anode field emission microscopy is used to map the electron emission current I(x,y) under constant anode voltage and the electron extraction voltage V(x,y) under constant emission current as a function of tip position on carbon based thin film emitters. The spatially resolved field enhancement factor β(x,y) i…
We have studied the effect of grain boundary migration on hillock formation in unpassivated Al thin films during thermal cycling. Hillocking occurs more frequently in Al films that experience grain growth during thermal cycling than in films with stabilized grain structures. The hillocking frequency is at least four t…
We report a MD simulation study of the behavior of the boson peak of a globular protein in realistic powder environments corresponding to conditions of neutron scattering studies (hydrated at 150 K, dry at 150 K, and dry at 300 K). The temperature and hydration dependence of the boson peak, an excess of inelastic scat…
The detection of early failures in electromigration (EM) and the complicated statistical nature of this important reliability phenomenon have been difficult issues to treat in the past. A satisfactory experimental approach for the detection and the statistical analysis of early failures has not yet been established. T…
Substitutions by aliovalent cations on the Sr2+ and Bi3+ sites of ferroelectric SrBi2Ta2O9 (SBT) have been carried out, which result in modified dielectric and electrical properties of SBT. The substitution of 10 mole % Fe3+ for Sr2+ shows an increase of 80 °C in TC, whereas Ca2+ substitution for Bi3+ gives rise to di…
In the present work process methodology was optimized to synthesize oriented barium strontium titanate (BST) (50/50) and (60/40) thin films on strontium titanate (100) and lanthanum aluminate (LAO) (100) substrates by using the chemical solution deposition technique. These films were characterized in terms of their ph…
Polyhydroxyalkanoates (PHAs) are polyoxoesters that are produced by diverse bacteria and that accumulate as intracellular granules. Phasins are granule-associated proteins that accumulate to high levels in strains that are producing PHAs. The accumulation of phasins has been proposed to be dependent on PHA production,…
Since the prediction of Liu and Cohen [Science 245, 841 (1989)] of the potential extraordinary mechanical properties of crystalline β-C3N4, many authors have attempted its synthesis. However, in most cases, the obtained materials are amorphous phases with a complex bonding structure. Their characterization is complica…
Superlattices offer the potential to enhance the figure of merit for thermoelectric cooling by increasing the Seebeck coefficient while decreasing the thermal conductivity compared to bulk samples. The large bulk value of ZT makes superlattices containing Bi2Te3 attractive for demonstrating benefits of using low-dimen…
The electrostatic and structural properties of CdSe nanocrystals are discussed using an atomistic model that treats both the nanocrystal core and its passivation layer. The model predicts the presence of a permanent dipole moment for CdSe nanocrystals in the wurtzite crystal structure. The dipole moment is mildly scre…
Previous dielectric relaxation measurements of glycerol and propylene carbonate and new results on propylene glycol performed below the conventional glass transition temperatures Tg after long periods of aging all show that the excess wing (a second power law at higher frequencies) in the isothermal dielectric loss sp…