Materials Literature
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The solubility of benzoic acid in water−ethanol and water− n -propanol mixtures at temperatures between (303.5 and 333.7) K has been measured by using an apparatus in our laboratory. Experiments were carried out employing different concentrations of alcohol. Addition of alcohol in water results in a large increase in…
Chirale Löcher: Die Titelverbindung mit helicalen dreidimensionalen Kanälen ist aus {GeS4}-Tetraedern und trigonalen ψ-{SbS4}-Bipyramiden aufgebaut. Die Struktur enthält Dimethylammoniumionen, die leicht gegen Alkalimetallkationen aus wässrigen Lösungen ausgetauscht werden können. Die Verbindung hat eine hohe Ionenaus…
We report the fabrication and investigations of organic light-emitting diodes (OLEDs) using a composite made by mixing poly[2-methoxy-5(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with CdSe/ZnS core/shell quantum dots (QDs). The electroluminescence efficiency of the studied devices was found to be improved as c…
To determine the effect of isothermal structural change on the configurational and vibrational parts, the real component of the complex specific heat ${C}_{p}^{\ensuremath{'}}$ of poly(styrene) at 3.33 mHz frequency was measured in its vitrification range during very slow cooling, heating, and during the isothermal an…
Using scanning tunneling microscopy (STM) and density functional theory simulations, we have studied the diffusion of alkoxy species formed by the dissociation of alcohols on bridge-bonded oxygen (BBO) vacancies (BBO(V)'s) on TiO2(110). At elevated temperatures (>or=400 K) the sequential isothermal STM images show tha…
The electrocrystallization of diiodo- and dibromo-ethylenedithiotetrathiafuvalene (EDT-TTFI2 and EDT-TTFBr2) in the presence of the polymeric 1D [Et4N][Cd(SCN)3] as an electrolyte affords two different salts, formulated as [EDT-TTF-I2]4[Cd3(NCS)8] x CH3CN x H2O (1) and [EDT-TTF-Br2]10[Cd5(SCN)14] x 2 TCE (2), characte…
Replacement of the tricyanofuran (TCF) acceptor by its stronger analogue CF 3-TCF results in decreased second-order optical nonlinearities in merocyanines bearing a proaromatic 1,3-dithiole donor. The TCF-containing derivatives display exceptionally high mu beta values up to 31,000 x 10(-48) esu, unprecedented for 1,3…
Multifunctional polyelectrolyte (or layer-by-layer, LbL) multilayers consisting of a set of nanocompartments separated by impermeable ultrathin barriers, whereby the thickness of the compartments is tuned in the range 1-10 nm, are synthesized. Each compartment contains a different dye, introduced by co-adsorption duri…
A large number of AgI-based fast-ion-conducting glasses have been investigated by K-iodine extended x-ray absorption fine structure spectroscopy (EXAFS) measurements at liquid nitrogen temperature. A general correlation between the I-Ag distance measured by EXAFS and the glass activation energy for dc ionic conductivi…
The electron spin flip relaxation dynamics in type II CdSe/CdTe nanorod heterostructures are investigated by an ultrafast polarization transient grating technique. Photoexcited charge separation in the heterostructures suppresses the electron-hole exchange interaction and their recombination, which reduces the electro…
Despite extensive experimental and theoretical studies, the detailed catalytic mechanism of orotidine 5'-monophosphate decarboxylase (ODCase) remains controversial. In particular simulation studies using high level quantum mechanics have failed to reproduce experimental activation free energy. One common feature of ma…
In this work, we functionalized TiO 2 nanorods with dopamine-functionalized diblock copolymers. After functionalization, they are well dispersible in organic solvents. Light scattering proves that the nanorods are dispersed as single objects, and we could use AFM (tapping mode) to visualize the homogeneous polymer she…
We report on stress−strain and swelling results for polydimethylsiloxane bimodal networks, studied both experimentally and via Monte Carlo simulations. These end-linked networks were formed with negligible extent of soluble fractions, and reasonable agreement is found between experimental results and simulation data.…
Kinetics of hydrogen peroxide decomposition over Pd/SiO 2 catalyst was investigated as part of a larger project to determine the overall kinetics of hydrogen peroxide formation by Pd/SiO 2 catalyzed direct combination of hydrogen and oxygen. A Pd oxidative/reductive cycle mechanism for the decomposition of H 2 O 2 ove…
Structure sensitivity is one of the key parameters that needs to be controlled to obtain atomistic design of catalysts. By means of density functional theory we have analyzed the synthesis of vinyl acetate from acetic acid, ethylene, and oxygen in several local configurations of Pd dimers on two gold surfaces (111) an…
Silver/organic−inorganic hybrid poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) coaxial nanocables were prepared by a facile method that involves two steps: the synthesis of silver nanowires through a soft, self-seeding, polyol process followed by adhesion of the PZS nanoparticles on the surface of silver nan…
The high-temperature superconductor $\text{SmFeAs}({\text{O}}_{1\ensuremath{-}x}{\text{F}}_{x})$ shows a clear nematic transition where the square lattice of Fe ions has a rectangular distortion. Similar nematic ordering has also been observed in the cuprate superconductors. We provide a detailed theory of experimenta…
A laser damage competition was held at the 2008 Boulder Damage Symposium in order to determine the current status of thin film laser resistance within the private, academic, and government sectors. This damage competition allows a direct comparison of the current state-of-the-art of high laser resistance coatings sinc…
The first four transitions (upper and lower branches of ${E}_{11}^{M}$ and ${E}_{22}^{M}$) for a broad diameter range (0.7--4 nm) of metallic single-walled carbon nanotubes are studied in the 1.26--2.71 eV energy range using resonance Raman spectroscopy of their radial breathing modes (RBMs). A scaling-law analysis of…
Die vielen Facetten von Gold: Trisoktaedrische Goldnanokristalle wurden erstmals in hoher Ausbeute synthetisiert. Elektronenbeugung und Elektronenmikroskopie belegen, dass die Nanokristalle durch 24 hoch induzierte Flächen wie die {221}-Ebenen (siehe SEM-Bild (links) und Modell (rechts)) begrenzt werden.