Materials Literature
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Within an intense research study concerning the theme “organization and reorganization of solution grown polyethylene single crystals”, the present part is focused on the nucleation and growth behavior of such crystals. Beside the well-known crystallization behavior, several novel features have been observed. Growth r…
Flüssigkristalle aus großen Graphitsegmenten: Diskotische Verbindungen, basierend auf substituierten Superphenalenen, wurden auf einfachem Weg hergestellt und in ungewöhnlicher Weise zu weichen und sehr gut löslichen columnaren flüssigkristallinen Phasen weiterverarbeitet. Die regiospezifische Synthese führt zu einer…
A class of silicon carbide cage clusters with two carbon atoms inside the silicon cage and with high stabilities are presented. The theoretical formalism used is Hartree-Fock theory followed by second-order many-body perturbation theory to account for correlation effects, and geometry optimizations at the second-order…
The interfacial tension σ between two polyisobutylenes (PIB) of dissimilar polydispersity and two polydisperse samples of poly(dimethylsiloxane) (PDMS) was measured as a function of time by means of a pendent drop apparatus at different temperatures ranging from 30 to 110 °C. In addition to three of the four possible…
The electromechanical performance characteristics of electrostrictive 0.9 Pb(Mg1/3Nb2/3)O3–0.1 PbTiO3 and piezoelectric 0.7 Pb(Mg1/3Nb2/3)O3–0.3 PbTiO3 ceramics have been investigated under uniaxial stress (σ). The results demonstrate that the large-signal electromechanical properties of electrostrictive ceramics are…
Pinning down flavoproteins: A designed β-hairpin peptide binds flavin mononucleotide (FMN) in water through noncovalent interactions involving Trp and Lys residues on one face of the β hairpin (see model). Reduction of FMN is disfavored in the complex as a result of favorable π–π stacking interactions between Trp side…
We investigate the role of axial ligands on the near-IR-optical and paramagnetic NMR spectra of the complex [YbL](+3) where L is the stereodefined enantiopure chiral macrocycle (L = hexaazapentacyclo[25.3.1.1(12,24).0(4,9).0(19,24)]dotriaconta-1(31),2,10,12,14,16(32),17,25,27,29-decaene). The conformation in solution…
Abstract Steady shear viscosities of blends of poly(butyl acrylate) and cholesteryl oleyl carbonate were studied under a cone and plate fixture. Unique shear behavior was observed for the polymer/low molar mass liquid crystal mixture. The viscosity of the liquid crystal‐rich phase increases with polymer content until…
The thermoelectric properties, including electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) on binary icosahedral Cd-Yb quasicrystals and Cd6Yb are investigated. The Cd-Yb quasicrystals have a room-temperature (RT) resistivity value of about 200 (μΩ cm), however, the temperature-dependen…
We produced single bubbles in water using a visible pulsed laser and studied the characteristics of the light emitted during the bubble collapse time as a function of the water temperature for different water purity values. The water temperature ranged from freezing point (0 °C) to near boiling. We measured the lumine…
The diameter distribution of the nanotubes produced by electric-arc discharge are measured using Raman spectroscopy at various wavelengths. These measurements agree with the results provided by two other techniques: high-resolution transmission electron microscopy and x-ray diffraction. The mean tube diameter shifts m…
Abstract The reaction of isophorone diisocyanate (IPDI) with poly(hexane neopentyl adipate glycol) (HNA) and dimethylol propionic acid (DMPA) was researched through an analysis of the contents of the NCO groups of the prepolymers through which water‐borne polyurethanes (PUs) could be formed. The reaction activity of D…
Based on the carbon thermodynamic equilibrium phase diagram, a nanoscaled thermodynamic approach, taking the effect of nanosize-induced additional pressure on Gibbs free energy of diamond critical nuclei and phase transition probability from graphite to diamond into account, was performed to elucidate diamond nucleati…
The catalytic wet oxidation (WO) mechanisms for the salts of organics, particularly carboxylic acids, in highly alkaline solution are of prime importance from the viewpoint of alumina producers because organic contaminants have adverse effects on the alumina refining process. Four organic compounds of interest, which…
Abstract Fluorinated polymers have a set of unique properties, including improved chemical stability and thermal stability and good barrier and membrane parameters, which are mainly defined by their surface properties. This article presents systematic data on the direct fluorination of the polyimide Matrimid® 5218, a…
An investigation on the ferroelectric and dielectric properties of vanadium-doped Sr2Bi4Ti5O18 ceramics was presented. The ferroelectricity of Sr2Bi4−x/3Ti5−xVxO18 samples (x=0, 0.003, 0.0048, 0.018, 0.048, and 0.096) was obviously improved by vanadium doping. The dielectric property measurement indicated that the Cur…
The effects of various lattice defects, such as a single edge dislocation, dislocation configurations, a low-angle grain boundary, and a high-angle grain boundary, on martensite nucleation and growth were investigated by performing molecular dynamics simulations, using EAM interatomic potentials for Ni–Al alloy. Stres…
The absolute value of the efficiency of electron injection from an excited coumarin dye (NKX-2311) into a nanocrystalline ZnO film was estimated as 0.8 ± 0.1 through transient absorption measurements. This value was obtained by using the molar absorption coefficient of the oxidized form of NKX-2311 determined in solut…
Abstract Polyaniline (PANI) films doped with hydrochloric acid have been electrochemically deposited on mirrorlike platinum electrode surfaces by a cyclic voltammogram method. The Raman spectra of doped PANI films were investigated by excitation with a 633‐ or 785‐nm laser beam. It was found that the overall features…
Abstract To improve the physicomechanical properties of jute yarn, grafting with 1,6‐hexanediol diacrylate (HDDA) monomer was performed by a UV radiation technique. A series of HDDA solutions of various concentrations in methanol were prepared. A small quantity of photoinitiator (Darocur‐1664) was also added to HDDA s…