Materials Literature
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Many ceramics are resistant to heat, corrosion, and wear, and they are used in applications ranging from coffee mugs to dental implants to protective tiles on the space shuttle. But they also break easily, and the maximum stress they can withstand varies unpredictably from component to component. Promising new approac…
Simple peroxomolybdenum Mimoun complexes become catalytically active in phase-transfer epoxidations with hydrogen peroxide, if the active oxenoid is extracted from the water into the organic phase by surfactant-type ligands OER3 (E = N, P, As; R = long-chain alkyl; see scheme). Mechanistic studies, Raman spectroscopy,…
A novel and efficient method for the production of enantiomerically pure (R)-(-)-hydroxycarboxylic acids by in vivo depolymerization of microbial polyester polyhydroxyalkanoates (PHAs) was developed. Using this method, several model compounds, (R)-(-)-3-hydroxyalkanoic acids, consisting of 4 to 12 carbon atoms, and (R…
Novel perfluorocyclopentene-derived metallic complexes exhibit pronounced photochromic properties that can form the basis of nondestructive read-out models in optical memory devices. The methodology is described, discussed, and illustrated here by a scheme that represents the interconversion between the open form and…
We report a first-principles description of the induced wake potential and density in real solids. The linear-response formalism is used to obtain the potential and density induced by an external charge penetrating through an inhomogeneous periodic system. The linear dynamical response of the system is evaluated in th…
An elegant and flexible synthesis of pyrene-based dyads bearing ruthenium or osmium chromophoric moieties connected through a single C≡C bond or a Pt(C≡C)2 spacer is described (see picture). Photophysical properties reveal that the two Ru-based units enter into reversible triplet energy transfer with the appended pyre…
Diatom cell walls are regarded as a paradigm for controlled production of nanostructured silica, but the mechanisms allowing biosilicification to proceed at ambient temperature at high rates have remained enigmatic. A set of polycationic peptides (called silaffins) isolated from diatom cell walls were shown to generat…
Masses of single-walled carbon nanotubes (SWNTs) with a large mean diameter of about 1.85 nanometers, synthesized by a semicontinuous hydrogen arc discharge method, were employed for hydrogen adsorption experiments in their as-prepared and pretreated states. A hydrogen storage capacity of 4.2 weight percent, or a hydr…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTReversible Cell Aggregation Induced by Specific Ligand−Receptor CouplingWolfgang MeierView Author Information Institut für Physikalische Chemie, Departement Chemie, Universität Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland Cite this: Langmuir 2000, 16, 3, 1457–1459Pu…
Recently, a number of research groups have found that dendrimers are effective templates for the synthesis of inorganic nanomaterials (Sooklal, K.; Hanus, L. H.; Ploehn, H. J.; Murphy, C. J. Adv. Mater . 1998, 10, 1083. Balogh, L.; Tomalia, D. A. J. Am. Chem. Soc. 1998, 120, 7355. Zhao, M.; Sun, L.; Crooks, R. M. J. A…
NMR data have revealed that γ-alumina surfaces do not contain any three-coordinated Al atoms, despite the fact that their presence is expected on the basis of the bulk structure of the material. We report density-functional calculations of γ-alumina (110) surfaces that reveal a massive spontaneous reconstruction of th…
Pathways and generated surface species of adsorption and consequent surface reactions of acetone vapor on characterized silica, alumina, and ∼5 wt % silica−alumina were examined by in-situ infrared (IR) spectroscopy, following degassing at room (RT) and higher temperatures (100−400 °C). For reference and confirmatory…
We report on the synthesis and characterization of rod-shaped PbS nanocrystals dispersed in a polymer film using a functionalized lead(II) salt of the surfactant anion AOT -, Pb(AOT) 2, as the precursor. Essentially all the PbS nanocrystallites prepared using this method have been oriented with their (100) lattice pla…
The continuous random network (CRN) model is an idealized model for perfectly coordinated amorphous semiconductors. The quality of a CRN can be assessed in terms of topological and configurational properties, including coordination, bond-angle distributions and deformation energy. Using a variation on the sillium appr…
The performance of various density functional approaches for the calculation of electron paramagnetic resonance (EPR) hyperfine coupling constants in transition metal complexes has been evaluated critically by comparison with experimental data and high-level coupled-cluster results for 21 systems, representing a large…
A heating treatment strategy for inducing size and shape change of composite nanoparticles in solutions is described. The composite nanoparticles are ∼2 nm gold cores encapsulated with alkanethiolate monolayers. The development of abilities in size and shape controls constitutes the motivation of this work. We demonst…
Epoxy resin is moulded to produce high voltage insulation components. To release the component from the mould, among other techniques, silicon-based release agents are used. The authors demonstrate that release agent is absorbed by resin during casting, and describe the change in reaction to electrical discharge stres…
Micrometer thick coatings of the hydroxides of La and Nd can be electrodeposited on stainless steel substrates by cathodic reduction of aqueous solutions of the corresponding nitrates. The coatings are uniform, adherent, and stable to thermal treatment up to moderate temperatures. At high temperatures (>900 °C), the c…
GRLite and GRTensorJ are first and second generation graphical user interfaces to the computer algebra system GRTensorII. Current development centers on GRTensorJ, which provides fully customizable symbolic procedures that reduce many complex calculations to "elementary functions". Although still in development, GRTen…
Trotz ähnlicher Ringdeformationen in Lösung und im Festkörper weist das synthetische Chloroeisen(III)-Derivat von 2,3,7,8,12,13,17,18-Octaethyl-5,10,15,20-tetraphenylporphyrin (oetpp), [FeCl(oetpp)] (hier schematisch dargestellt), nur eine sehr schwache quantenmechanische Beimischung eines S=3/2-Spinzustands (nur 4–10…