Materials Literature
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A procedure for surface hydrolysis of poly(glycolic acid) (PGA) meshes was developed to increase cell seeding density and improve attachment of vascular smooth muscle cells. Hydrolysis of PGA in 1N NaOH transformed ester groups on the surface of PGA fibers to carboxylic acid and hydroxyl groups. After hydrolysis, the…
Engineering tissues utilizing biodegradable polymer matrices is a promising approach to the treatment of a number of diseases. However, processing techniques utilized to fabricate these matrices typically involve organic solvents and/or high temperatures. Here we describe a process for fabricating matrices without the…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionSonolytic Decomposition of Ozone in Aqueous Solution: Mass Transfer EffectsLinda K. Weavers and Michael R. HoffmannCite this: Environ. Sci. Technol. 1999, 33, 2, 372Publication Date (Web):December 4, 1998Publication History…
We study the wetting properties by water of composite surfaces constructed from solid micrometer-size magnetic particles anchored at the interface of polymer films, in relation to the structure of the surface determined by atomic force microscopy and confocal microscopy. We measure the advancing and receding contact a…
The new solid-state alkali metal gold thiocadmates Cs2Au2Cd2S4, Rb2Au2Cd2S4, and K2Au4CdS4 photoluminesce brightly. Their interrelated polymeric structures are formed by the linking of the [CdS2]2− and [CdS4]6− anions by gold atoms (see figure).
A star-shaped molecule and a layered structure are displayed by the title compound, where the layers consist of high molecular weight polymers. A core molecule that is functionalized by six hydroxyl groups acts as the initiator for the ring-opening polymerization of ε-caprolactone, leading to a six-arm star polymer. T…
Durch Bestrahlen mit Weißlicht läßt sich die Oberfläche von porösem Silicium mit Alkenen und Alkinen gezielt funktionalisieren (siehe Schema). Die Hydrosilylierung ist sehr einfach durchführbar und führt zur Bildung stabiler strukturierter Oberflächen. Diese Methode eröffnet neue Möglichkeiten zur Verwendung von porös…
Polarization holographic gratings were inscribed in azobenzene side chain polymer films. The polarization gratings were produced using two orthogonally circularly polarized beams and the resulting stable transmission gratings were studied using a low power HeNe laser. The gratings were observed to efficiently separate…
Steric interactions between the anthraquinoid core and the 1,3-dithiole and dicyanomethylene groups play a key role in determining the physical properties of system 1. The intramolecular charge transfer properties of this donor–π-acceptor species have been explored and cyclic voltammetric data, X-ray crystal structure…
Zeitabhängige NMR- und MS-Analysen ergaben, daß bei der Selbstorganisation eines linearen Liganden mit Metallionen mit oktaedrischer Koordinationsgeometrie wie Fe2+ oder Ni2+ zuerst unter kinetischer Kontrolle Dreifachhelicate und anschließend die thermodynamisch stabileren ringförmigen Helicate 1 entstehen. Die Ergeb…
The misfolding process of the amyloidogenic proteins such as prion proteins is mimicked by the α- to β-structural transition of a peptide obtained by introducing adamantanecarbonyl groups at the N-terminals of two linked α-helices. The α- to β-transition (left to right of graph) coincided with the formation of fibrils…
] with an unoccupied Ag position (right in picture)-both hitherto unknown-are found in two new layer-type double salts of AgCN and AgF that display novel types of cyanide coordination modes.
The photophysical properties of wire-type compounds based on a photosensitizing RuII complex linked to an electron-accepting bipyridinium or diazapyrenium group have been studied with the aim of designing light-driven molecular machines based on pseudorotaxanes (shown schematically). As an outcome, the photoinduced de…
A family of smectic liquid-crystalline dendrimers has been synthesized by connecting rodlike cyanobiphenyl mesogens, with various spacer lengths, at the periphery of poly(propylene imine) dendrimers. A combination of differential scanning calorimetry, optical microscopy, and X-ray diffraction suggests that, under the…
Hybrid colloids with new and unusual morphologies (see figure) are formed by precipitation of calcium phosphates in the presence of hydrophobically modified double-hydrophilic block copolymer micelles. The use of interactive polymer templates broadens the toolbox of chemistry required for the construction of complex s…
We have studied the effect of disorder on the radiative properties of semiconductor quantum wires by time-resolved photoluminescence spectroscopy. The dependence of the radiative lifetimes is measured over a temperature range extending from 8 to 150 K. At low temperatures we find that the measured dependence does not…
An ab initio LMTO approach and semi-empirical quantum chemical INDO method have been used for supercell calculations of basic point defects - F-type centers and hole polarons bound to cation vacancy - in partly covalent perovskite KNbO3. We predict the existence of both one-site and two-site (molecular) polarons with…
The effective transport coefficients and figure of merit ZT for anisotropic systems are derived from a macroscopic formalism. The full tensorial structure of the transport coefficients and the effect of the sample boundaries are included. Induced transverse fields develop which can be larger than the applied fields an…
We demonstrate theoretically that the electronic ground state of the potassium-covered Si(111)-B surface is a Mott insulator, explicitly contradicting band theory but in good agreement with recent experiments. We determine the physical structure by standard density-functional methods, and obtain the electronic ground…
The Jahn-Teller effect used semi-theoretically to analyse UV-visible spectra of the diamond like-carbon films on Si substrates. By deconvolution of UV-visible absorption spectra of the typical films, different absorption lines found. For each sample, six lines which were related to $\V^\circ$ by Jahn-Teller effect are…