Materials Literature
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Spectroscopic properties of optical fibers with a bismuth-doped silicate glass core are explained on the basis of molecular orbital theory and a solution of the Schrödinger equation, which takes into account the exchange, the spin-orbital, and the glass field potential interactions of s, p, and d electron shells of bi…
The properties of four finite-length bent and straight intramolecular junctions (IMJs) connecting two armchair and zigzag single-walled carbon nanotube segments, viz. (3,3)-(6,0) and (4,4)-(8,0), were investigated. Their structures were calculated using the density functional theory (DFT) methods at the B3LYP/6-31G(d)…
We have investigated the volume collapse occurring in ${\text{LaMnO}}_{3}$ unit cell using the anisotropic Potts model modified by two types of anisotropic interactions which has been used to study the behavior of the orbital-ordering configurations with temperature. The bond lengths are related to the occupation of t…
No AccessNano- and Micromechanics of Polymer Blends and CompositesMay 2009Creep and Fatigue Behavior of Polymer NanocompositesA. PegorettiA. PegorettiSearch for more papers by this authorhttps://doi.org/10.3139/9783446430129.009SectionsAboutPDF ToolsAdd to FavoritesDownload CitationTrack CitationsCopy LTI LinkPDF key…
Abstract New trinuclear mixed‐valent Co III ‐Co II ‐Co III complexes with salen‐type ligands have been synthesized and characterized both in the solid state and in solution. These complexescomprise a central CoCl 2 unit connecting two [RCo(4,4′,7,7′tmsalen)] fragments with chlorides acting as bridging ligands between…
The pressure-induced phase transition in amorphous germanium disulfide $(a{\text{-GeS}}_{2})$ is studied using an ab initio constant-pressure technique. With the application of hydrostatic pressure, $a{\text{-GeS}}_{2}$ undergoes a gradual phase transition from a semiconducting low-density amorphous state to a metalli…
We have performed a spectroscopic study of ErxY1-x[(p-CF3-C6F4)2PO2]3 aimed at understanding nonradiative de-excitation mechanisms. These fluorinated compounds have a long lifetime for the erbium 4I13/2-->4I15/2 emission at lambda approximately 1540 nm, but the lifetime increases with decreasing x. We have studied the…
Abstract The time‐dependent bending recovery of human hair fibers was investigated for a variety of relative humidities and aging times. The data were analyzed on the basis of a viscoelastic filament/matrix model and the Denby‐equation, containing the parameter K as the ratio of the elastic bending rigidities of the m…
Ti-Au surface alloy oxidation is used to form nanocrystals of TiO(2) on Au(111). In situ scanning tunneling microscopy (STM) studies show that the approach yields arrays of 8-11 nm wide crystals with relatively narrow size dispersion and uniform crystallography. STM imaging shows that their crystallographic form is ru…
The influence of transition metals (TMs) on the hydriding/dedydriding critical point of NaAlH 4 has been studied using the chemical potential method. The theoretical results predict that, if the reaction system reaches equilibrium, most of the TM additives significantly increase its hydriding/dedydriding critical poin…
We report the formation and characterization of [Fe(CN) 6 ] 3− intercalated Ni II /Fe III layered double hydroxides (LDHs) to form exchange coupled oxides and single crystalline monodisperse spinel ferrite in the absence of organic surfactant. The presence of excess divalent Ni ions can act as an inorganic surfactant…
We measured the far-infrared vibrational properties of bulk and nanoscale ${\text{MoS}}_{2}$ in order to investigate finite length scale effects and chemical bonding in these materials. From an analysis of frequencies, oscillator strengths, and high-frequency dielectric constants, we extract Born and local effective c…
On the basis of the structure of electrochemically prepared hexacyanometallate compounds, which was determined very recently and unexpectedly to be an insoluble structure ( Bueno, P. R.; et al. J. Phys. Chem. C 2008, 112, 13264), a more detailed picture of the electrochromic switching mechanism in this kind of compoun…
Electron transfer can occur from the TTF units to the substituted quinone unit in a new TTF-quinone-TTF triad 1 containing the N,N-dialkylaniline-substituted quinone unit flanked by two TTF units, in the presence of metal ions (Pb(2+), Zn(2+), and Sc(3+)). Simultaneously, the corresponding charge transfer within the s…
In this paper, we present the synthesis of PbS cubes with a hierarchical pyramidal pit on each face by a facile template-free solvothermal approach in the presence of cetyltrimethyl ammonium bromide (CTAB). In addition to anisotropic PbS cubes, we obtained an amount of PbS tapes. The growth mechanism of the cubes with…
Different strategies for functionalization of the core region and periphery of core−shell type hyperbranched polymers (HBP) using the “click” reaction have been explored. For achieving peripheral functionalization, an AB 2 + A−R 1 + A−R 2 type copolymerization approach was used, where A−R 1 is heptaethylene glycol mon…
Abstract Aus drei Bausteinen entstehen auf der Grundlage eines Cyclodextrin‐Adamantan‐Erkennungssystems supramolekulare Nanopartikel (SNPs) variabler Größe (30–450 nm). Die Bioverteilung und Lymphknotendrainage der SNPs in Mäusen wurde mit Positronenemissionstomographie untersucht. Die Größen der SNPs beeinflussen ihr…
Abstract Finding textile applications for a new or underused fiber is always very attractive, especially when the fiber is natural and indigenous. Leafiran fiber is derived form the leaves of a plant called Typha australis, which belongs to the family Typhaceae. The fiber was obtained by chemical retting. Some propert…
Abstract Dynamically cured blends of polypropylene (PP) and ethylene octene copolymer (EOC) with coagent‐assisted peroxide curative system were prepared by melt‐mixing method. It was well established that PP exhibits β‐chain scission in the presence of peroxide. Principally, incorporation of a coagent increases the cr…
Single-walled carbon nanotubes below 1.5 μm in length are effectively rigid rod-like polymers, but polymer solubility theory has not yet been applied to their solution phase dispersion despite its success in modeling other polymer systems. In this work, we experimentally determine the solubility of arc discharge singl…