Materials Literature
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Highly uniform, smooth, and conformal coatings of tungsten nitride were synthesized by atomic layer deposition (ALD) from vapors of a novel precursor, bis( tert- butylimido)-bis(dimethylamido)tungsten, ( t BuN) 2 (Me 2 N) 2 W, and ammonia at low substrate temperatures (250−350 °C). This tungsten precursor is a low-vis…
In the present contribution, we demonstrated that surface-enhanced resonance Raman scattering spectra from single green fluorescent proteins (GFPs) were obtained. The most important findings are the direct detection of the conversion between a deprotonated and a protonated form of the chromophore at the single-molecul…
In this paper various predictions for the scaling exponents of the Nonlocal Kardar-Parisi-Zhang (NKPZ) equation are discussed. I use the Self-Consistent Expansion (SCE), and obtain results that are quite different from result obtained in the past, using Dynamic Renormalization Group analysis (DRG), a Scaling Approach…
The polycondensation of isophorone diisocyanate (IPDI) with dodecanediol has been performed in aqueous miniemulsion in order to obtain hydrophobic polyurethane dispersions. The influence of several factors, such as temperature, surfactant, and catalyst, on the molecular weight has been studied in detail. It has been f…
We report a first-principles study of a class of $({\mathrm{BiScO}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{3}{)}_{x}$ (BS-PT) alloys recently proposed by Eitel et al. as promising materials for piezoelectric actuator applications. We show that (i) BS-PT displays very large structural distortions and…
We address the microscopic origin of the current-induced forces by analyzing results of first principles density functional calculations of atomic gold wires connected to two gold electrodes with different electrochemical potentials. We find that current induced forces are closely related to the chemical bonding, and…
The effect of edge and corner diffusions on the morphology and on the density of islands nucleated irreversibly on a flat substrate surface is studied. Without edge and corner diffusion, islands are fractal. As an edge diffusion constant $D_e$ increases, islands tend to take a cross shape with four needles in the $< 1…
Recent works aiming at understanding magnetotransport phenomena in ferromagnetic III-V and II-VI semiconductors are described. Theory of the anomalous Hall effect in p-type magnetic semiconductors is discussed, and the relative role of side-jump and skew-scattering mechanisms assessed for (Ga,Mn)As and (Zn,Mn)Te. It i…
Magnetotransport properties of GaMnAs single layers and InGaMnAs/InGaAs superlattice structures were investigated at temperatures from 4 K to 300 K and magnetic fields up to 23 T to study the influence of carriers confinement through different structures. Both single layers and superlattice structures show paramagneti…
The mixed-valence perovskitelike manganites are characterized by the unique interrelation of Jahn-Teller distortions, electric and magnetic properties. The Jahn-Teller distortion follows the ${\mathrm{Mn}}^{3+}\ensuremath{\rightarrow}{\mathrm{Mn}}^{4+}$ charge transfer with some delay. Its development depends on the l…
We theoretically study the interplay between electrical and mechanical properties of suspended, doubly clamped carbon nanotubes in which charging effects dominate. In this geometry, the capacitance between the nanotube and the gate(s) depends on the distance between them. This dependence modifies the usual Coulomb mod…
Polyaniline (PANI) composite nanotubes (90−130 nm in diameter) containing titanium dioxide (TiO 2 ) nanoparticles (about 10 nm in diameter) were synthesized through a self-assembly process in the presence of β-naphthalenesulfonic acid (β-NSA) as the dopant. It was found that the morphology, size, conductivity, and hyd…
Metallic nanowires (Au, Ag, Cu, Ni, Co, and Rh) with an average diameter of 40 nm and a length of 3-5 μm have been fabricated by electrodeposition in the pores of track-etched polycarbonate membranes. Structural characterizations by transmission electron microscopy (TEM) and electron diffraction showed that nanowires…
Sidewall functionalization of single-walled carbon nanotubes (SWCNTs) via the addition of (R-)oxycarbonyl nitrenes allows for the covalent binding of a variety of different groups such as alkyl chains, aromatic groups, dendrimers, crown ethers, and oligoethylene glycol units. Such additions lead to a considerable incr…
The beneficial effect of halide ions on the inhibition of corrosion of carbon steel in 20 per cent HCl solution in the presence of some nitrogen‐containing compounds, cetyl pyridinium chloride, cetyl pyridinium bromide, and hexamine was investigated using potentiodynamic polarisation measurements. Potentiodynamic pola…
Growth of truncated hexagonal dipyramidal Au nanoislands is reported by annealing Au/amorphous-Si/crystalline-Si at 1030 °C in oxygen and nitrogen ambient. Metastable gold silicide phase of Au7Si is observed to form at the interface of Au and polycrystalline Si, which was transformed from amorphous Si. Oxygen, acting…
The infrared reflection spectra of silica glass were monitored at different angles of incidence and different polarization directions of the incident light. The frequency of the transverse optic mode in the vicinity of 1129 cm−1 remains a constant under different conditions, whereas the frequency of the longitudinal o…
Abstract The electrically conducting polyfuran/poly(2‐iodoaniline) (PFu/P2IAn) and P2IAn/PFu composites were prepared by chemical oxidative polymerization using polyfuran and poly(2‐iodoaniline) in HCl and CHCl 3 media. The conductivities of composites were determined as a function of the amount of guest polymer. It w…
A comprehensive study of the effect of hole doping on cupric oxide CuO, which may be an important reference compound for copper oxide superconductors, is done by experiments on the structural, transport conduction, and magnetic susceptibility properties of ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Li}}_{x}\mathrm{O}.$…
Abstract A detailed investigation on the thermodynamic behaviour of the physical and chemical organogels, using differential scanning calorimetry (DSC) and modulated thermogravimetric analysis (MTGA), is presented. Aluminium soap of fatty acid was used as the physical gelator and in situ crosslinking of siloxane copol…