Materials Literature
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We study the response of an adsorbed monolayer under a driving force as a model of sliding friction phenomena between two crystalline surfaces with a boundary lubrication layer. Using Langevin-dynamics simulation, we determine the nonlinear response in the direction transverse to a high symmetry direction along which…
Effects of induced biaxial strain on the electrical transport and magnetic properties of epitaxial thin films of SrRuO3 and La0.67Sr0.33MnO3 by structural transitions of ferroelectric BaTiO3 substrates have been studied. Large jumps of electrical resistivity (∼5% in SrRuO3 and ∼12% in La0.67Sr0.33MnO3) and low field m…
We report an experimental system based on rigid, monodisperse, microparticles with tunable surface properties for the study of topological defects that form about dispersed solid phases in anisotropic media. We clearly observe equatorial Saturn-ring defects to form a distance (0.09+/-0.01)R from the surface of isolate…
The well-defined geometry and extreme structural anisotropy of a multiwalled carbon nanotube can bring qualitatively new features to its nanometer-scale tribology. Efficient cancellation of registration-dependent interactions in incommensurate tubes (and also, surprisingly, certain axial commensurate tubes) can induce…
A tricomponent system composed of resorcinol, hexamethylene tetramine (HMT), and hydrated silica was used as an adhesion promoter with a nitrile rubber (NBR) mix. The resorcinol was replaced by o-aminophenol, m-aminophenol, p-aminophenol, or m-phenylene diamine. The rubber–textile cord samples were subjected to aging…
A number of diverse bulk properties of the zincblende and wurtzite III-V nitrides AlN, GaN, and InN, are predicted from first principles within density functional theory using the plane-wave ultrasoft pseudopotential method, within both the LDA (local density) and GGA (generalized gradient) approximations to the excha…
The existing interpretation and models of electroluminescence (EL) in poly(ethylene-2, 6-naphthalate) (PEN) suggest a mechanism triggered by the impact excitation and/or ionization of the luminescent centres by hot electrons. Excitation by bipolar charge recombination has not been considered extensively because of the…
The enzyme magnesium protoporphyrin chelatase catalyses the insertion of magnesium into protoporphyrin, the first committed step in chlorophyll biosynthesis. Magnesium chelatase from the cyanobacterium Synechocystis PCC6803 has been reconstituted in a highly active state as a result of purifying the constituent protei…
Authors' address: Ludwig-Maximilians-Universitat Munchen, Zoological Institute, Department of Ecology, Karlstr. 25, D-80333 Munchen Germany.
Single-walled carbon nanotubes are ideal systems for investigating fundamental properties and applications of one-dimensional electronic systems. The interaction of magnetic impurities with electrons confined in one dimension has been studied by spatially resolving the local electronic density of states of small cobal…
We have studied the ordering dynamics of the striped patterns of a single layer of cylindrical block copolymer microdomains in a thin film. By tracking disclinations during annealing with time-lapse atomic force microscopy, we observe a dominant mechanism of disclination annihilation involving three or four disclinati…
Modulation doping of a semiconducting single-walled carbon nanotube along its length leads to an intramolecular wire electronic device. The nanotube is doped n-type for half of its length and p-type for the other half. Electrostatic gating can tune the system into p-n junctions, causing it to exhibit rectifying charac…
Aromatic amino acid aminotransferase is active toward both aromatic and dicarboxylic amino acids, and the mechanism for this dual substrate recognition has been an issue in the enzymology of this enzyme. Here we show that, in the reactions with aromatic and dicarboxylic ligands, the pK(a) of the Schiff base formed bet…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTInterfacial Tension Measurement of a Reactive Polymer Blend by the Neumann Triangle MethodJin Kon Kim, Woon-Yong Jeong, Jeong-Man Son, and Hyun Kyoung JeonView Author Information Department of Chemical Engineering and Polymer Research I…
The steady-state diffusion-controlled current of polyaniline-coated polystyrene latex particles suspended in water contained a periodic wave with a typical frequency of 14 Hz. The latex particles were monodispersed spheres, 2.6 μm in diameter. They were composed of cores of polystyrene on which a 0.4 μm thick redox ac…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTGe2ZrO6F2·(H2DAB)H2O:1 A 4-Connected Microporous Material with "Bow Tie" Building Units and an Exceptional Proportion of 3-RingsHailian Li, Mohamed Eddaoudi, Jacques Plévert, M. O'Keeffe, and O. M. YaghiView Author Information Materials Design and Discovery Group Depar…
Helical fibers of porous manganese oxide have been prepared from colloidal solutions. Such fibers have diameters ranging from several mm to the micrometer range. These helices are formed, starting from a well-mixed colloidal precursor and applying no external forcing other than its confinement in a capillary or beaker…
Recombinant Escherichia coli strains harboring a plasmid containing a novel artificial polyhydroxyalkanoate (PHA) operon consisting of the Aeromonas PHA biosynthesis related genes and Ralstonia eutropha reductase gene were developed for the production of poly(3-hydroxybutyrate-co-hydroxyhexanoate) [P(3HB-co-3HHx)] fro…
We have synthesized methylated mono- and di(ethylene glycol)-functionalized polymers of L-serine and L-cysteine that adopt beta-sheet conformations in the solid state: poly(O-(2-(2-methoxyethoxy)ethyl)-L-serine), poly(1); poly(O-(2-(methoxy)ethyl)-L-serine), poly(2); and poly(S-(2-(2-methoxyethoxy)ethoxy)carbonyl-L-cy…
A poly(styrene- block -isoprene- block -styrene) (SIS) triblock copolymer with a polystyrene (PS) cylinder morphology was processed via roll-casting to produce a near single-crystal texture. Deformation experiments normal to the cylinder axis were carried out using synchrotron small-angle X-ray scattering (SAXS) with…