Materials Literature
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We calculate viscosity and thermal conductivity in systems of Lennard-Jones particles consisting of coexisting solid and liquid with different interface wetting properties using the recently developed equilibrium boundary fluctuation theory. We compare the slip length and equivalent liquid length obtained from these c…
ZnO nanowires were grown on 2-μm-thick GaN templates by chemical vapor deposition without employing any metal catalysts. The GaN template was deposited by metal-organic chemical vapor deposition on a c-plane sapphire substrate. The diameters of the resulting nanowires were in the range of 40–250nm depending on growth…
Graphene, with its massless linearly dispersing carriers, in the quantum Hall regime provides an instructive comparison to conventional two-dimensional systems in which carriers have a nonzero band mass and quadratic dispersion. We investigate the influence of Landau-level mixing in graphene on Wigner crystal states i…
Abstract This work describes the preparation and characterization of polypyrrole (PPy)/iron oxide nanocomposites fabricated from monodispersed iron oxide nanoparticles in the crystalline form of magnetite (Fe 3 O 4 ) and PPy by in situ chemical oxidative polymerization. Two spherical nanoparticles of magnetite, such a…
Rigorous calculations of the imaging properties of metamaterials consisting of metal-coated semiconductor nanoparticles are presented. In particular, it is shown that under proper choice of geometric and material parameters, arrays of such particles exhibit negative refractive index within the region of the excitonic…
Magnetic nanocrystalline VO 2 particles have been successfully synthesized in a silica glass matrix by the sol–gel method at calcination temperatures of 700 °C and above. The presence of small quantities of diamagnetic V 2 O 5 nanocrystals in glass samples calcined at ≥800 °C has been confirmed. The thermal behavior o…
Within density functional theory with the generalized gradient approximation plus on-site Coulomb repulsion method, we investigate magnetic ordering dependence of linear and nonlinear optical responses in multiferroic Bi2FeCrO6. We find that in spite of the minor difference in the linear dielectric function between fe…
We have developed novel aperiodic multilayers, covered by capping layers resistant to environmental attack, that offer superior performance for extreme ultraviolet lithography. We have designed these coatings using an optimization procedure based on an algorithm able to acquire domain knowledge inside the space of pos…
In this article, surface-enhanced Raman scattering (SERS) spectra of bombesin (BN) and its six modified analogues ([D-Phe(12)]BN, [Tyr(4)]BN, [Tyr(4),D-Phe(12)]BN, [D-Phe(12),Leu(14)]BN, [Leu(13)-(R)-Leu(14)]BN, and [Lys(3)]BN) on a colloidal silver surface are reported and compared with SERS spectra of these species…
In the present study, Ba 0.70 Sr 0.30 TiO 3 thin films were realized by chemical solution deposition based on the use of an alkoxide precursor. The solution is spin-coated onto stainless steel substrates and a classical multi-layer technique was used in order to obtain thicker films. The elaboration route is described…
Abstract In this study, novel carrier materials were synthesized by addition of metal dihalide compounds in the synthesis reaction of magnesium diethoxide using metallic magnesium, ethanol and iodine. Poly(propylene) polymerizations were then investigated with the MgCl 2 ‐supported TiCl 4 catalysts using these carrier…
Nanoparticles of diluted magnetic semiconductor Zn1−xCrxTe with various Cr concentrations were synthesized by a chemical method, and their magnetic properties were investigated. The synthesized nanoparticles show ferromagnetism, and the saturation magnetization increased with increasing Cr concentration in the range f…
Thermopiles are important components in infrared thermal detectors, thermoelectric generators and thermoelectric coolers. We present a thermopile structure with up to 224 vertically arranged thermocouple legs in a polyimide flex material. The thermopile is optimized for infrared thermal radiation detection and is fabr…
We report for the first time measurements and modelization of the angular distributions of absorption and fluorescence in a monoclinic crystal. Studies on Nd:YCOB revealed specific topologies with ombilics. These new data upgrade the knowledge on low symmetry crystal optics.
We report on the deposition by a sol-gel process of Ba 0.8 Sr 0.2 TiO 3 films on platinum coated silicon substrates. X-Ray diffraction patterns show that the films are (111) preferentially oriented. The surface morphology is smooth, without cracks and the grain size is about 50 nm as determined by AFM and SEM. The die…
Abstract Optical second‐harmonic generation (SHG) from ZnO nanowires is investigated in the region around the band gap. Strong multiphoton excited luminescence and SHG appearing together in the spectra from wires are separated and the SHG part is compared to that of a bulk crystal. The spectrum of the effective second…
The comprehension of the mechanisms of nucleation and growth that regulate the gypsum (calcium sulfate dihydrate) precipitation is fundamental to prevent scaling problems. The present paper reports measurements of the induction period for gypsum nucleation when citric acid is added in solution as an additive to retard…
A grapevine nanostructure based on single-walled carbon nanotubes (SWNTs) covalently functionalized with [60]fullerene (C60) has been synthesized and characterized in detail. Investigations into the ball-on-tube carbon nanostructure by ESR spectroscopy indicate a tendency for ground-state electron transfer from the SW…
A series of experiments were conducted in a reduced gravity (near-free-fall) environment (g = 0) and on ground (g = 1) to study the effect of gravity on the advancing contact angles of sessile drops. The reduced net acceleration force was produced by parabolic flights. The ground experiments were conducted for various…
We have reconsidered the Bell-Lavis model of liquid water and investigated its relation to its isotropic version, the antiferromagnetic Blume-Emery-Griffiths model on the triangular lattice. Our study was carried out by means of an exact solution on the sequential Husimi cactus. We show that the ground states of both…