Materials Literature
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Higher capacity rechargeable batteries can be constructed by using mesoscale nickel hydroxide tubes as the positive-electrode material. The tubes were prepared by deposition of nickel ions and aqueous ammonia in an anodic alumina membrane as the template. The picture shows a high-resolution TEM image of the tubes.
Höhere Kapazitäten als andere Akkumulatoren zeichnen Batterien aus, deren positive Elektroden mesoskalige Nickelhydroxid-Röhren als Material enthalten. Die Röhren entstehen durch Abscheidung von Ni(OH)2 mit Ammoniaklösung, wobei eine Aluminiumoxidmembran als Templat wirkt. Die Abbildung zeigt eine Hochauflösungs-TEM-A…
In a wide variety of applications, including the modelling of the glassy state of dense matter, non-exponential correlation functions in nuclear magnetic resonance, polymer dynamics, and bone and muscle rheology, Kohlrausch functions have proved to be more appropriate in modelling the associated relaxation and decay p…
A new polymorph of SrS(3) was obtained by a reaction of SrS and S with an atomic ratio of Sr:S = 1:5 under a pressure of 5 GPa at 1200 degrees C. It crystallized in a tetragonal unit cell with a = 6.708(1) A, c = 3.942(1) A, and V = 177.36(6) A(3). It was isotypic with BaS(3), and contained S3(2-) polysulfide ions. Th…
Abstract Magnetite iron oxide (Fe3O4) has been found to be an efficient heterogeneous catalyst for the epoxidation of alkenes by molecular oxygen in the absence of a sacrificial reductant among various transition metal oxides. The reaction probably proceeds via a radical mechanism.
Forces across polymer melts are poorly understood despite their importance for adhesion and fabricating composite materials. Using an atomic force microscope (AFM), this interaction was measured for poly(dimethyl siloxane) (PDMS). The structure of the polymer at the surface changed during the first approximately 10 h.…
The variations with temperature of the viscosity, η, and the relaxation times for various low molecular weight, unentangled polystyrenes (PS) are analyzed. We find that the temperature dependence of η does not directly reflect the behavior of the global chain modes. Depending on molecular weight and temperature, η can…
Hybrid composites of PbS nanoparticles embedded in sulfonated polystyrene matrixes were prepared without other added capping agent in the random ionomer. The nanocomposites were found to exhibit photoluminescence in both the near-infrared and visible regions. The infrared luminescence was tunable in the range 1100−150…
Zeolites collapse under modest pressure or temperature, their microporous structures transforming into glasses of conventional density. Using in situ synchrotron radiation diffraction methods we show how pressure and temperature-induced amorphization are equivalent processes and that these are mirrored by changes in t…
CuO and Cu 2 O powders were reacted by hydrogen to study the reduction mechanism and the ionic states of Cu (Cu 2+ , Cu 1+ and Cu 0 ). The reduction behaviour and the existence of an intermediate state were investigated by using synchrotron-based high-resolution in situ x-ray diffraction (S-XRD) techniques. The result…
Abstract Efficient base-catalysts for low temperature solid-phase imidization of poly(amic acid) (PAA) have been found. Thermal imidization of PAA proceeded smoothly in the presence of 1 wt % of strong bases such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) at 200 °C in a short…
We describe the synthesis of new high affinity and selective A(3)-adenosine receptor (A(3)-AdoR) agonists. Introduction of a methyl group at the N(6)-position of the A(2A)-AdoR selective 2-pyrazolyl-adenosine analogues (Figure 2) brought about a substantial increase in the A(3)-AdoR binding affinity and selectivity. W…
The transformation between martensite and austenite in shape memory alloy is characterized by four transformation temperatures: martensite start temperature ( M s ), martensite finish temperature ( M f ), austenite start temperature ( A s ) and austenite finish temperature ( A f ). In actuator designs that rely on the…
A new lithographic technique has been developed and applied to cell adhesion studies and electro-optical material development. Attachment of 6 nm Au particles, in periodic and non-periodic pattern, onto non-conductive substrates has been achieved. This was performed via a combination of diblock copolymer self-assembly…
The fracture toughness of isotactic polypropylene (iPP)−polyamide 6 (PA6) assemblies, stabilized by diblock copolymers formed in situ during the annealing of the samples, has been investigated as a function of annealing conditions and molecular architecture of the PP part of the copolymer. Comparing the evolutions of…
We report on photoinduced fluorescence enhancement (PFE) in a thin film of CdSe/ZnS core/shell quantum dots (QDs) sandwiched between a glass substrate and a silicon oxide layer and the dependence on the degree of proximity between the QDs. CdSe/ZnS QDs capped with tri- n -octylphosphine oxide (TOPO) were colloid-chemi…
Rigorous evidence of metallicity of a molecular crystal consisting of single-component neutral molecules is disclosed by observing the Fermi surface through magnetic quantum oscillations. Torque magnetometry measurements of de Haas-van Alphen oscillatory signals in a single crystal of [Ni(tmdt)2] molecules (tmdt = tri…
Mixtures of 5-phenylvalerate, octanoate, and 10-undecenoate were fed to a chemostat culture (dilution rate = 0.1 h -1 ) of Pseudomonas putida GPo1 under well-defined dual-(C,N)-nutrient limited growth conditions. Five new, tailor-made copolymers were produced and consisted of poly(3-hydroxy-5-phenylvalerate- co -3-hyd…
An electric field induced sphere-to-cylinder transition in thin films of asymmetric polystyrene- b -poly(methyl methacrylate) diblock copolymers was observed. In the absence of an applied electric field, thin films of the asymmetric diblock copolymer consisted of layers of spherical microdomains with poor in-plane lon…
Gold-capped, protein-modified polypyrrole (Ppy) nanowires were grown electrochemically using porous aluminum oxide as a template. The effects of the conditions of electrochemical synthesis on Ppy growth and protein (avidin or streptavidin) incorporation were studied. Streptavidin-modified nanowires grown at constant p…