Materials Literature
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[reaction: see text] Novel two-dimensional octupoles containing donors at the core and acceptors at the edge of peripheral groups were synthesized by Horner-Wittig reactions. These chromophores show very large first hyperpolarizability and good thermal stability and are attractive candidates for nonlinear optical mate…
In this paper, we present detailed performance analyses of three types of two-stage thermoelectric (TE) coolers, which are supplied with serial, parallel and separate electric currents, respectively, with respect to the ratio n of the TE couple number between the stages. The analyses are all carried out at three optim…
The behavior of the disorder-induced D band in the Raman spectrum of single-wall carbon nanotubes (SWCNT's) was investigated both theoretically and experimentally. The measured maximum position of the D band for SWCNT bundles exhibits an oscillation superimposed on a linear shift, when the laser excitation energy ${E}…
The microscopic mechanism beyond the optical anisotropy of an ionic crystal which occurs for short wavelengths is investigated. The electron-hole, two particle propagator and its analytical behaviour close to the band edge of the one particle continuum plays a major role for the mechanism of this optical anisotropy. E…
We consider low-dimensional dynamical systems exposed to a heat bath and to additional ac fields. The presence of these ac fields may lead to a breaking of certain spatial or temporal symmetries which in turn cause nonzero averages of relevant observables. Nonlinear (non)adiabatic response is employed to explain the e…
We have performed molecular dynamics simulations to study the effect of an external electric field on a macroion in the solution of multivalent Z:1 salt. To obtain plausible hydrodynamics of the medium, we explicitly make the simulation of many neutral particles along with ions. In a weak electric field, the macroion…
We report a new method of synthesis of an Au nanoparticle-conductive polyaniline composite by using H2O2 both for reduction of HAuCl4 and polymerization of aniline in the same aqueous medium: the electrical conductivity of the composite has been measured to be two orders of magnitude higher than the polymer itself.
Abstract Plant fibers are of increasing interest for use in composite materials. They are renewable resources and waste management is easier than with glass fibers. In the present study, longitudinal stiffness and strength as well as morphology of unidirectional sisal–epoxy composites manufactured by resin transfer mo…
The behavior of the Fréedericksz threshold voltage of a planarly oriented sample filled with liquid crystalline azobenzene material possessing a nematic phase is investigated under UV illumination. It is found that the anchoring strength strongly decreases with the UV-exposure time due to the photoisomerization proces…
Molecular-dynamics simulations were used to investigate the storage capacity of hydrogen in single-walled carbon nanotubes (SWNT's) and the strain of nanotube under the interactions between the stored hydrogen molecules and the SWNT. The storage capacities inside SWNT's increase with the increase of tube diameters. Fo…
Photoexcitation of zinc porphyrin−bridge−naphthalenediimide (ZP−B−NI) dyads, 1 and 2, generated the short- and long-distance charge-separated (CS) states, [ZP •+ −B−NI •- ], through the intramolecular electron-transfer from excited ZP to NI in solvents of various polarity. The energy level of [ZP •+ −B−NI •- ] was eit…
ADVERTISEMENT RETURN TO ISSUEPREVCommentInterpretation of Gibbs Equation for the Case of Phase Transition in Adsorption LayersV. B. Fainerman and Reinhard MillerView Author Information International Medical Physicochemical Centre, Donetsk Medical University, Prospekt Ilischa 16, 83003 Donetsk, Ukraine, and Max-Planck-…
The effects of the interactions of metal ions with lipoic acid-capped Ag and Au nanoparticles have been studied by the combined use of electronic absorption spectroscopy and transmission electron microscopy. Three types of effects that are dependent on the metal ion concentration can be distinguished. First, in the di…
A Fréedericksz transition measurement is reported for a liquid crystal cell composed of surfactant-coated substrates. One substrate was locally scribed with the stylus of an atomic force microscope to create a nanoscopic grooved structure. The Fréedericksz threshold voltage was found to be smaller in the scribed regio…
A silver 4-tert-butylthiophenolate complex generated in situ reacted with CS2 in acetone to give an anionic cluster [Ag50S7(SC6H4But-4)40]4-, the core of which consists of fifty silver atoms and forty-seven sulfur atoms, shaped like a discus with a diameter of ca. 2.0 nm.
The radial dynamics of an acoustically driven single bubble, levitated in water, along with the sonoluminescence (SL) signal, were recorded in the absence and in the presence of micromolar quantities of different surfactants and polymers. It was observed that these nonvolatile solutes, in the low concentration range u…
Hydroxylation and dehydroxylation reactions at the surfaces of amorphous silica and Mg(OH) 2 have been studied by ab initio Car-Parrinello molecular dynamics simulations. A particular topological defect on the amorphous silica surface, the two-membered (2M) silicon ring, is shown to react fast with water thus confirmi…
A series of tetrahomodioxacalix[4]arene tetraamides and tetrathioamides with four p-phenyl groups on their upper rim were synthesized. From the (1)H and (13)C NMR and crystal structure, N-butylamido homooxacalix[4]arene (4) was found to be in the 1,3-alternate conformation and has intramolecular hydrogen bonding betwe…
We investigated the possibility of using several sensing parameters from porous silicon in order to improve gas selectivity. By fabricating porous silicon optical microcavities, three independent quantities can be measured, i.e. the electrical conductance, the photoluminescence intensity, and the wavelength of the opt…
We have used scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and X-ray photoelectron spectroscopy (XPS) to investigate the thermal stability of Pd(111) islands and thin films on TiO 2 (110)-(1 × 2). Two new nano-structures were observed to form on the surface of the Pd by annealing to 973…