Materials Literature
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Friedel-Crafts acylation of nickel meso-tetraarylporphyrins with aryl anhydrides, followed by air oxidation in the presence of pyridine, DMAP, and excess anhydride, produced corroles in 8-21% yields. Other products include a porphyrinic ketone, an additional corrole whose bridge has been retained as an acyl group atta…
Abstract Summary: In this work, a novel method using water as a pre‐dispersant of pristine sodium montmorillonite (Na + ‐MMT) and ε ‐caprolactam (CL) monomer was developed for the preparation of exfoliated monomer casting polyamide 6 (MCPA6)/MMT nanocomposites via in situ anionic ring opening polymerization. The dispe…
Generalized planar fault energy (GPFE) curves have been used to predict partial-dislocation-mediated processes in nanocrystalline materials, but their validity has not been evaluated experimentally. We report experimental observations of a large quantity of both stacking faults and twins in nc Ni deformed at relativel…
Block copolymer inverse micelles from polystyrene-block-poly-2-vinylpyridine (PS-b-P2VP) deposited as monolayer films onto surfaces show responsive behavior and are reversibly switchable between two states of different topography and surface chemistry. The as-coated films are in the form of arrays of nanoscale bumps,…
The amorphous-to-crystal transition has been studied by in-situ resistance measurements for Ge 2 Sb 2 Te 5 (GST) thin films doped with silicon (Si) or nitrogen (N). It was found that the electrical properties and thermal stability of GST films can be improved by doping small amount of Si in the GST film. In comparison…
A new class of degradable polymers is obtained from a diene monomer and molecular oxygen as the starting materials via a highly controlled radical copolymerization process. We now report the regiospecific copolymerization of a tetrasubstituted ethylene monomer with oxygen. Theoretical calculations support the highly s…
Abstract A series of poly(dimethylsiloxane‐urethane) elastomers based on hexamethylenediisocyanate, toluenediisocyanate, or 4,4′‐methylenediphenyldiisocyanate hard segment and polydimethylsiloxane (PDMS) soft segment were synthesized. In this study, a new type of soft‐segmented PDMS crosslinker was synthesized by hydr…
The present study demonstrates a novel application of polyelectrolyte microcapsules as microcontainers with electrochemically reversible flux of redox active materials into and out of the capsule volume. Incorporation of the capsules inside the conducting polymer (polypyrrole) film results in a new composite electrode…
Bull's-eye! ZnS nanostructures consisting of three intersecting ribbons in the form of a dart-shaped tricrystal were prepared by the thermal evaporation of ZnS powder. The ZnS ribbons have lengths of several tens of micrometers, a growth direction of [2], and a width of 0.5–1 μm (see SEM image). The nanostructure is f…
Polymers are known to exhibit strong rate-dependent mechanical behavior. In different temperature and/or frequency regimes, the rate sensitivities of polymers change as various primary (α) and secondary (β) molecular mobility mechanisms are accessed. The incorporation of nanoparticles into the polymer matrix can poten…
The plasma exposed components in existing and future fusion devices are strongly affected by the plasma material interaction processes. These mechanisms have a strong influence on the plasma performance; in addition they have major impact on the lifetime of the plasma facing armour and the joining interface between th…
Choose your favorite shape: A facile, visible-light-assisted, solution-phase approach yields various selenium micromaterials, including tubes, rods, shuttles (see picture), and an urchin-like assembly of Se nanorods. The shape of the products is determined by the intensity of the light and the ratio of SeO2 and poly(v…
Nanoscale ZnO grains and rods having various aspect ratios were selectively synthesized through acidic and basic routes, respectively, in an aqueous system at 60 °C. Equiaxial nanograins were obtained by the addition of NaOH into an acidic solution of ZnSO 4 (acidic route). On the other hand, nanorods with an aspect r…
In view of increasing interest in light-emitting materials, we have investigated the light-emitting characteristics and occurrence of conjugation between arms of star-shaped rigid molecules that comprise a 1,3,5-triethynylbenzene core and methoxy group-substituted oligo(p-phenylethynylene) arms. Consequently, we achie…
Copper nanocrystals are obtained by chemical reduction of copper ions in mixed reverse micelles. A large excess of reducing agent favors producing a new generation of shaped copper nanocrystals as nanodisks, elongated nanocrystals, and cubes. By using UV-Visible spectroscopy and numerical optical simulations we demons…
We have synthesized the solid solution ${\mathrm{Sr}}_{2}{\mathrm{Fe}}_{1+x}{\mathrm{Mo}}_{1\ensuremath{-}x}{\mathrm{O}}_{6}$ with $\ensuremath{-}1\ensuremath{\leqslant}x\ensuremath{\leqslant}0.25$, the composition $x=0$ corresponding to the well-known double-perovskite system ${\mathrm{Sr}}_{2}\mathrm{Fe}\mathrm{Mo}{…
This paper examines the mechanism of pore formation in anodic films on aluminium. For this purpose, the dimensional changes of specimens during growth of porous films on aluminium in phosphoric and sulphuric acid electrolytes are examined using transmission and scanning electron microscopies. Further, the compositions…
Abstract A biodegradable aliphatic thermoplastic polyurethane based on L ‐lysine diisocyanate and 1,4‐butanediol hard block segments, and 2000 g/mol poly(ε‐caprolactone) diol soft block segments was synthesized. The resulting polymer was a tough thermoplastic with ultimate tensile strength of 33 MPa and elongation of…
The photoluminescence of Ce 3+ and Tb 3+ ions in zinc metaphosphate glasses is investigated. The blue and green emissions of Tb 3+ ions are enhanced upon UV excitation through energy transfer from Ce 3+ to Tb 3+ ions. The efficiency of such an energy transfer was estimated based on spectroscopic data and resulted in b…
A 2-mm-diameter glass sphere of ferroelectric BaTi 2 O 5 was fabricated from melt using containerless processing. The glass structure was analyzed by high-energy X-ray diffraction using an incident photon energy of 113.5 keV, indicating that distorted Ti−O polyhedra, with average coordination number ( N Ti - O ) of ap…