Materials Literature
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Electron excitation and relaxation in chromium are probed with 20-fs time resolution using an ultrafast optical technique. We obtain good fits to the data for the transient reflectivity and transmittivity changes in a thin film using a simple model of electron relaxation, suggesting the existence of an efficient elect…
The response field of a half-space anisotropic superconductor is evaluated for an arbitrary weak external field source. Example sources of a point magnetic moment and a circular current are considered in detail. For the penetration depth $\ensuremath{\lambda}\ensuremath{\ll}L$ with L being any other relevant distance…
Novel molecular energy and electron transfer assemblies in vesicular form, which are made of self-organized amphiphilic porphyrins bearing phospholipid-like substituents (lipid-porphyrins), have been photochemically characterized. Tetraphenylporphyrin (TPP) derivatives with four dialkylphosphocholine groups [free-base…
Template-based electrochemical methods for the synthesis of nanostructures on the basis of new redox polymers poly[M(Schiff)] (M = Ni, Pd; Schiff = tetradentate Schiff bases) with nanowire diameters in the range of 20−200 nm were developed. Polymeric nanostructures were characterized by means of electron microscopy, c…
The interactions of Stöber silica nanospheres having diameters of ca. 40, 100, and 200 nm were studied at the water−air interface with a Wilhelmy film balance. The particle sizes and size distribution functions were determined from TEM measurements. According to in situ Brewster angle microscopy investigations and the…
Abstract Recently a method that uses water droplets at the air–solution interface as an ordered template was reported for the preparation of ordered micrometer‐size honeycomb structures. Here we show that the method can also be used for formation of honeycomb‐like porous films from random copolymers with certain hydro…
The electron-phonon interaction is calculated for electrons states in single wall carbon nanotubes. Explicit results are presented for armchair and zig-zag tubes. The scattering by acoustical phonons confirm earlier results, while the scattering by optical phonons is new.
Abstract The electronic and structural properties of LiB 3 O 5 (LBO) surfaces have been studied by X‐ray photoemission spectroscopy (XPS) and reflectance high‐energy electron diffraction (RHEED). The as‐grown (110) crystal face and mechanically polished (001) surfaces have been investigated comparatively. Electronic s…
The same Bragg reflection in TiO2 from 12 different (CBED) patterns (from different crystals, orientations, and thicknesses) are analyzed quantitatively to evaluate the consistency of the quantitative CBED method for bond-charge mapping. The standard deviation in the resulting distribution of derived X-ray structure f…
Accurate low-order structure factors for copper metal have been measured by quantitative convergent beam electron diffraction (QCBED). The standard deviation of the measured structure factors is equal to or smaller than the most accurate measurement by any other method, including X-ray single crystal Pendellösung, Bra…
Abstract A novel aromatic amine organo‐modifier synthesized in our previous work was used to treat montmorillonite (MMT) and the organo‐modified MMT was used to prepare poly(etherimide) (PEI)/MMT nanocomposites by a melt intercalation method. MMT treated by this amine exhibited large layer‐to‐layer spacing and a high…
We study light transport in a honeycomb structure as the simplest two-dimensional model foam. We apply geometrical optics to set up a persistent random walk for the photons. For three special injection angles of 30 degrees, 60 degrees, and 90 degrees relative to a hexagon's edge, we are able to demonstrate by analytic…
The kinetics of the disorder−order transition (ODT) in a triblock of polystyrene (PS) and poly(ethylene- co -butylene) (PEB), in mineral oil, a selective solvent for the middle PEB block, was followed by time-resolved SAXS using both temperature ramp and rapid temperature quench techniques. Data analysis, using the Pe…
A series of segmented polyurethanes obtained from perfluoropolyether (PFPE) and isophorone diisocyanate (IPDI) were studied by using quantitative thermal analysis. The glass transition behavior of the segregated phases of the segmented copolymers, compared to the corresponding amorphous homopolymers, was characterized…
The thermal chemistry of 2-propanol and 2-propyl iodide on clean and oxygen-pretreated Ni(100) single-crystal surfaces was studied by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and reflection−absorption infrared spectroscopy (RAIRS). 2-Propyl iodide was used as a precursor for the…
Abstract Various non‐oxide (CuI, AgI, AgCl, PbS, CuS and ZnS) and oxide (ZnO, TiO 2 , SnO 2 , CeO 2 and ZrO 2 ) powders were prepared under hydrothermal conditions to investigate the effects of temperature, pH and precursors on the particle size of powders. It was found that the particle sizes of PbS, CuS and ZnS powd…
Abstract Electrochemical oxidative polymerization of pyrrole on platinum electrode in acid medium was carried out. Different reaction parameters were investigated such as current density, acid concentration, monomer concentration, and temperature with duration of time. The orders of the electropolymerization reaction…
A simple approach is presented for using bond-stretching and bond-bending modes to describe the static deformations of carbon nanotubes and related actuation effects. This approach allows us to analyze various phenomena in a unified way and to clarify their relationships. We discuss gap energy modulation by external s…
Abstract Large single crystals of polar Li 2 SeO 4 ·H 2 O were grown at 343 K from aqueous solution. Temperature dependent thermal expansion coefficients of Li 2 SeO 4 ·H 2 O and Li 2 SO 4 ·H 2 O were determined within the temperature range 133 K–313 K and coefficients of the pyroelectric effect within the temperature…
The Dynamic Electrochemical Impedance Spectroscopy has been applied for stress corrosion cracking (SCC) investigations. The effect of applied potential and tensile stresses on the stress corrosion cracking behaviour of type 304L stainless steel (SS) immersed in 0.5 M NaCl solution of room temperature has been examined…