Materials Literature
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Silk fibroin is a simple protein expected to have functional applications in medicine and bioelectronics. The primary structure of this protein is quite simple, and the main secondary structures are β-sheet crystals and amorphous random coils. In the present study, we investigated pulsed laser deposition (PLD) of fibr…
The recently discovered superconductor MgCNi 3 crystallizes in the classical cubic perovskite structure. The electronic structures of the MgCNi 3- x M x (M = Co, Cu; x = 0, 0.5, 1.0) system have been calculated using the self-consistent tight-binding linear muffin-tin orbital method. The calculations showed that the F…
Iron containing diamond-like amorphous carbon (a-C:Fe) films were deposited by filtered cathodic vacuum arc technique. The influences of Fe content and substrate bias on the surface energy of the films were investigated. The surface energy of a-C:Fe films was determined by the contact angle measurement. Atomic force m…
We have simulated the size dependence of domain patterns in a two-dimensional (square shaped) constrained ferroelectric system by means of a time-dependent Ginzburg–Landau model. The theory incorporates elastic strain in the form of an effective long-range nonlocal interaction of the polarization. A nonferroelectric l…
The properties and mechanism of the magnetic phase transition of the perovskite-type Ti oxides, which is driven by the Ti-O-Ti bond angle distortion, are studied theoretically by using the effective spin and pseudospin Hamiltonian with strong Coulomb repulsion. It is shown that the A-type antiferromagnetic (AFM(A)) to…
Abstract The electron emission yields of insulators irradiated with ultra‐short pulsed X‐ray and electron beams differ significantly from those of metals. The main experimental results are reviewed and it is shown that the use of simple models for the transport and for the escape of the generated secondary electrons a…
The dependence of the permittivity of porous alumina on the microstructure was studied. Three different algebraic mixing laws inaccurately predicted the measured effective permittivity of the three-phase material, which was alumina, air, and water. Finite-difference electrostatic simulations of physically realistic mi…
We report on photoinduced second-harmonic generation (SHG) in chalcogenide glasses. Fundamental and second-harmonic waves from a nanosecond pulsed Nd:YAG laser were used to induce second-order nonlinearity in chalcogenide glasses. The magnitude of SHG in 20G?20A?60S glass was 10(4) larger than that of tellurite glass…
A microscopic approach has been developed for the self as well as cross diffusivity of a binary fluid mixture based on the concepts of mode coupling theory. Illustrative numerical results calculated for a Lennard-Jones fluid mixture are presented and are shown to be in good agreement with the available computer simula…
A new ligand (H2LOH) obtained from the Schiff base condensation of 4-(diethylamino)salicylaldehyde with 1,3-diamino-2-propanol is reported, which yields two different copper(II) complexes: CuLOH and Cu2LO(AcO). Crystal data are as follows. CuLOH*EtOH: monoclinic, P2(1)/n, a = 17.810(2) A, b = 8.515(1) A, c = 18.912(2)…
The interplay between quarter-filled and half-filled umklapp scattering has been examined by applying the renormalization group method to a one-dimensional quarter-filled electron system with dimerization, on-site (U) and nearest-neighbor (V) repulsive interactions. The phase diagram on the U-V plane is obtained at ab…
[structure: see text] Heteroannulenes 1 and 3 containing three subunits of isoindole or pyrrole, respectively, three 1,3,4-thiadiazole moieties, and six aza-bridges have been synthesized by reaction of the corresponding diiminoisoindoline or diiminopyrroline with 2,5-diamino-1,3,4-thiadiazole. These conjugated nonarom…
Similarly to the constant loss model used for expressing the electron-induced secondary electron yield from solids, δ, a simple model is used for expressing the x-ray-induced electron emission yield, δX, from uncharged insulators. The two yields involve common mechanisms for the transport and the escape of the seconda…
Nitrogen doped hydrogenated amorphous carbon thin films have been deposited by rf plasma-enhanced chemical vapor deposition using CH4 as the source of carbon and with different nitrogen flow rates (N2/CH4 gas ratios between 0 and 3), at 300 K. The dependence modifications of the optical and the structural properties o…
The effective Hamiltonian for two crossed nanotubes is derived in a k · p scheme and the conductance between them is calculated in the Born approximation. The conductance is found to depend strongly on the crossing angle with large maxima at commensurate stacking of lattices of two nanotubes. In a magnetic field perpe…
Six-layer electrochromic devices of indium tin oxide (ITO)/NiOxHy/WO3/ZrP-electrolyte/WO3/ITO were made by reactive dc magnetron sputtering and lamination. The WO3 layer between the acidic ZrP-based electrolyte and the NiOxHy layer served as optically passive protective layer. The optical inactivity of the protective…
We report measurement of the silicon diffusion coefficient in silicon dioxide films using isotopically enriched Si28 silicon dioxide layers that enable relatively low Si30 concentration measurements to be performed using secondary ion mass spectrometry. Two types of experiments are made. Si30 atoms are introduced in e…
To clarify the thresholdless, hysteresis free V-shaped switching due to frustration between ferro- and antiferroelectricity, we have studied a prototype binary mixture system. The apparent orientational order parameters, $〈{P}_{2}〉$ and $〈{P}_{4}〉$, obtained from polarized Raman scattering in thin homogeneous cells in…
We present the $T=0$ phase diagram of the double-exchange model (ferromagnetic Kondo lattice model) for all values of the carrier concentration n and Hund's couplng J, within dynamical mean field theory. We find that depending on the values of n and J, the ground state is either a ferromagnet, a commensurate antiferro…
Electron paramagnetic resonance (EPR) has now become firmly established as one of the methods of choice for analyzing the carbon network over a range of different volume fraction of the carbon black in the composite, i.e., below and above the respective conduction threshold concentration. In the present article, two t…