Materials Literature
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We report on optical reflection measurements of thin Au films at and around the percolation threshold (film thickness 3 to 10 nm) in an extremely broad spectral range from 500 to 35000 cm-1 (0.3 - 20 *10-6 m). Combining spectroscopic ellipsometry and Fourier-transform infrared spectroscopy, the dielectric properties o…
Abstract Polypropylene (PP) nanocomposites with multi‐walled carbon nanotubes (CNT) were produced by a small‐scale masterbatch melt dilution technique using five PP differing in melt flow index (MFI) and degree of maleination. PP used in a masterbatch has MFI = 12 (PP 12 ), the others used PP which have MFI = 2 or MFI…
Adiabatic shuttling of single impurity bound electrons to gate induced surface states in semiconductors has attracted much attention in recent times, mostly in the context of solid-state quantum computer architecture. A recent transport spectroscopy experiment for the first time was able to probe the Stark shifted spe…
We introduce an alternative approach to the first-principles calculation of NMR shielding tensors. These are obtained from the derivative of the orbital magnetization with respect to the application of a microscopic, localized magnetic dipole. The approach is simple, general, and can be applied to either isolated or p…
We studied optical absorption of single-walled carbon nanotubes by varying the dielectric environment. For the two different components of the broad UV-absorption feature conventionally referred to as the $\ensuremath{\pi}$ plasmon, we find that the component at 5.0--5.3 eV exhibits remarkable spectral changes, which…
In double spin filter (SF) tunnel junctions, the spin information is generated and analyzed purely from the SF effect with nonmagnetic electrodes. In this article we numerically evaluate the bias dependence of magnetoresistance in such tunnel junctions (nonmagnetic metal / SF / nonmagnetic insulator / SF / nonmagnetic…
We investigate the atomic hydrogen adsorption on Mg(0001) by using density-functional theory within the generalized gradient approximation and a supercell approach. The coverage dependence of the adsorption structures and energetics is systematically studied for a wide range of coverage and adsorption sites. In the co…
Several SrTiO3 (STO) thin films without electrodes processed by pulsed laser deposition, of thicknesses down to 40 nm, were studied using infrared transmission and reflection spectroscopy. The complex dielectric responses of polar phonon modes, particularly ferroelectric soft mode, in the films were determined quantit…
Experimental studies of FeCoB/MgO/FeCoB tunnel junctions indicate that boron diffuses into MgO during rf-sputtering and forms polycrystalline Mg-B-O regions. These tunnel junctions provide high tunneling magnetoresistance values and low RA products. However the crystal structure of the Mg-B-O region remains unknown. U…
The group IB impurities (Cu, Ag, and Au) incorporated into II-VI zinc blende hosts of ZnTe and CdTe exhibit well resolved excitation lines followed by a photoionization continuum in their infrared absorption spectra. They are associated with transitions from a "1s-like" ground state to various "p-like" excited state c…
We compare femtosecond pump-probe experiments in Ni and micromagnetic modelling based on the Landau-Lifshitz-Bloch equation coupled to a two-temperature model, revealing a predominant thermal ultrafast demagnetization mechanism. We show that both spin (femtosecond demagnetization) and electron-phonon (magnetization re…
According to Moore law, the silicon semiconductor transistor based information system is facing its physical limitations due to fluctuations of random charge and leakage current. Molecular electronics is becoming more and more attractive owing to the advantages of easy molecular structure variability, flexibility, low…
In the context of glass fiber manufacturing the onset of lubrication by a C18 double-chained cationic surfactant has been investigated at high normal contact pressures. Comparison with adsorption kinetics demonstrates that lubrication is not directly connected to the surfactant surface excess but originates from the t…
We report on a comprehensive study of the transport, specific heat, magnetic susceptibility, and optical spectroscopy on single crystal of ${\text{Fe}}_{1.05}\text{Te}$, which undergoes a first-order phase transition near 65 K. We show that its physical properties are considerably different from other parent compounds…
A combined study of Raman scattering, IR absorption, photoluminescence, and photoconductivity was performed in ZnO. Two shallow donors---hydrogen at the bond-centered lattice site, ${\text{H}}_{\text{BC}}$, and hydrogen bound in an oxygen vacancy, ${\text{H}}_{\text{O}}$---were identified. Donor ${\text{H}}_{\text{BC}…
The general conditions are determined for stable multiple orbits of non-relativistic charged particles in a race-track-shaped optical system.These conditions are then considered in the context of an electrostatic storage ring consisting of two 180 • hemispherical deflector analysers connected by two separate sets of c…
Treatment of 4,5-bis(4-methoxycarbonylphenoxy)phthalonitrile with Zn(OAc)2˙2H2O and 1,8-diazabicyclo[5.4.0]undec-7-ene in octan-1-ol or dodecan-1-ol led to base-promoted cyclotetramerization. Under these conditions, transesterification also occurred to give the corresponding zinc(II) octakis(4-alkoxycarbonylphenoxyph…
Introduction Composite materials are those that contain two or more distinct constituent materials or phases, on a microscopic or macroscopic size scale larger than the atomic scale, and in which physical properties are significantly altered in comparison with those of a homogeneous material. In this vein, fiberglass…
The aim of this study is to evaluate potential application of an intumescent coating in order to fire retard polypropylene composites. Using intumescent coatings and specific surface treatments such as cold plasma treatment prior to making the deposit, PP composites presenting a UL94 V-0 classification at low thicknes…
Abstract Cone calorimetry studies showed that various metal‐exchanged clays and zeolites containing only 3–4% of Cu(II), Cu(I), Zn(II), or Al(III) were effective smoke suppressants and fire retardants for plasticized poly(vinyl chloride). Copper(II)‐Zn(II) and Cu(II)‐Al(III) synergism for smoke and heat reduction was…