Materials Literature
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The effect of plasma oscillations on acoustic wave amplification by carrier drift in semiconductors is discussed. A continuum theory is developed on the basis of hydrodynamical equations for the conduction electrons, the equations for the elastic vibrations of the crystal, and the Poisson equation. It is shown that if…
Restoring force acts on the electronic cloud of the outer electrons of a neutral or charged impurity atom when it is shifted relative to the inner charged core. Because of this the dipole oscillation arises, which influences considerably the dispersion law of the plasma oscillation in bulk donor semiconductors. Assumi…
X-ray reflectivity studies reveal atomic-level surface-segregation at the free surface of the eutectic Au71Sn29 liquid alloy. The surface-segregation extends up to three layers, in which the top layer is almost a pure monolayer of Sn, the second layer is almost a pure monolayer of Au and the third layer appears to be…
The behavior of quantum fluids (4He and H2) within nanopores is explored in various regimes, using several different methods. A focus is the evolution of each fluid's behavior as pore radius R is increased. Results are derived with the path integral Monte Carlo method for the finite temperature (T) behavior of quasi-o…
This study demonstrates that the transport properties of alkali metals are determined principally by the repulsive wall of the pair interaction potential function. The (hard-wall) Lennard-Jones(15-6) effective pair potential function is used to calculate transport collision integrals. Accordingly, reduced collision in…
Piezoresponse Force Spectroscopy (PFS) has emerged as a powerful tool for probing polarization dynamics on the nanoscale. Application of a dc bias to a nanoscale probe in contact with a ferroelectric surface results in the nucleation and growth of a ferroelectric domain below the probe apex. The latter affects local e…
Hexagonal boron nitride (h-BN) nanostructures were grown on Ru(0001), and are very similar to those previously reported on Rh(111). They show a highly regular 12 x 12 superstructure, comprising 2 nm wide apertures with a depth of about 0.1 nm. Valence band photoemission reveals two distinctly bonded h-BN species, and…
We have studied the optical transition energies of single-wall carbon nanotubes over broad diameter (0.7-2.3 nm) and energy (1.26-2.71 eV) ranges, using their radial breathing mode Raman spectra. We establish the diameter and chiral angle dependence of the poorly studied third and fourth optical transitions in semicon…
We review recent work on the preparation, characterization and application of “smart” microgel particles. A general feature of all systems under consideration here is their ability to react to external stimuli as e.g. the pH or the temperature in the system. Special emphasis is laid on our recent research work on the…
Most of the current techniques for detection of dopamine exploit its ease of oxidation. However, the oxidative approaches suffer from a common problem. The products of dopamine oxidation can react with ascorbic acid present in samples and regenerate dopamine again, which severely limits the accuracy of detection. In t…
Elastomers and rubberlike materials form a critical component in diverse applications that range from tyres to biomimetics and are used in chemical, biomedical, mechanical and electrical engineering. This updated and expanded edition provides an elementary introduction to the physical and molecular concepts governing…
In this work we study the electronic conductivity of reduced Gd-doped ceria in single-crystals by impedance spectroscopy in the near-room temperature regime (25-110{degree sign}C). The extent of non-stoichiometry in the as-prepared reduced samples is determined by thermogravimetry and the integral enthalpy of re-oxida…
A numerical model was developed to simulate the plasma electrolytic oxidizing of aluminium and magnesium alloys in direct current galvanostatic mode. The model based on the analysis of acoustic emission assumes that during plasma oxidizing the dielectric breakdown is due to the increase of electric field appearing at…
The kinetics of growth of the oxide film on platinum has been studied in alkaline solutions as a function of pH. The experimental data confirm the existence of steady states in the current and thickness. Diagnostic criteria for the dependence of the steady state current and thickness on applied potential and pH are de…
Containerless liquid‐phase processing methods were used to synthesize two glasses, both containing alumina (A), yttria (Y), and lanthana (L), and one containing ∼20 mole% silica (S) as well. In both materials, denoted AYL and AYLS, alumina is the dominant component (>50 mole%), and the lanthana:yttria ratio is ∼2:1…
Abstract Three models, two of them relying on free volume—the Cohen–Turnbull–Fujita (CTF) model and the Vrentas–Duda (VD) model, and the third being empirical using an exponential concentration dependence of the diffusivity, were applied to desorption data for a series of alkane penetrants (2,2‐dimethylbutane, cyclohe…
Wann wird was linear? Die Synthese der ersten Polycyanidverbindungen eines 5f-Elements (siehe Bild, U grün, N blau, C weiß) stützt die Vorstellung, dass die Geometrie von Metallocenen sowohl von der Metalloxidationsstufe als auch von der Größe und Form der äquatorialen Liganden abhängt. Theoretische Studien ergaben, d…
The kinetics of the methane decomposition at NdNi 5 catalyst powder has been studied by means of the thermogravimetry in the temperature range from 475 to 525 °C. The catalytic reaction yields the dusting of the catalyst particles, the size of which is in the domain of microns, in nanocrystals, which are encapsulated…
Based on the formalisms of Langmuir and Fowler, theoretical adsorption isotherms are calculated for different bundle geometries of single wall carbon nanotubes in a triangular lattice. The authors show the dependence of the adsorption properties on the nanotube diameter and on the specific morphology of the bundles th…
Low-temperature interaction of nitrogen base ligands with layered Co(TTP)(NO) (TTP = meso-tetratolylporphyrinato dianion) as well as its toluene solution leads to the formation of the first six-coordinate species of the general formula (B)Co(TTP)(NO) (where B = piperidine and pyridine). The nu(NO) stretching bands of…