Materials Literature
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Here, we demonstrate that by coalescing double-walled carbon nanotubes (DWNTs), a novel and stable structure consisting of flattened tubules containing two single-walled tubes (SWNTs) is created. The process occurs due to the coalescence and reconstruction of the outer shells of DWNTs, leaving the inner cylinders almo…
In this paper we will present recent results obtained for hydrogen adsorbed on metal oxide surfaces using helium-atom scattering (HAS). The hydrogen adlayers were prepared by exposing clean and well defined metal oxide surfaces to either molecular or atomic hydrogen. The HAS measurements were complemented by LEED and…
The nature and dynamics of the lowest excited states of fac-[Re(I)(L)(CO)(3)(phen)](+) and fac-[Re(I)(L)(CO)(3)(5-NO(2)-phen)](+) [L = Cl(-), 4-ethyl-pyridine (4-Etpy), imidazole (imH); phen = 1,10-phenanthroline] have been investigated by picosecond visible and IR transient absorption spectroscopy in aqueous (L = imH…
X-ray diffraction, magnetization, electrical resistivity and thermal expansion measurements were done on a series of Heusler alloys of the form Ni2MnGa1-xInx 0 < x < 0.25. X-ray diffraction patterns indicate that the samples possess a highly ordered Heusler alloy L21 type structure. Due to the larger radii of the In i…
The influence of poly(acrylic acid) (PAA) on the morphological evolution of calcite crystals depended on the concentration and molecular weight of the polyelectrolyte in an aqueous solution. A low-molecular-weight PAA (Mw 2000) weakly suppressed the regular crystal growth and miniaturized calcite grains as a suppressa…
Crystal and magnetic structure of the Ca3Mn2O7 Ruddlesden–Popper phase: neutron and synchrotron x-ray diffraction study, Maxim V Lobanov, Martha Greenblatt, El’ad N Caspi, James D Jorgensen, Denis V Sheptyakov, Brian H Toby, Cristian E Botez, Peter W Stephens
CoFe 2 O 4 nanocrystallites have been synthesized by alkalide reduction of Co 2+ and Fe 3+ to form nanoscale CoFe 2, followed by oxidation with aerated water at room-temperature resulting in the nanocrystalline ferrite. As produced, the material consists of 2−4 nm nanocrystals that are superparamagnetic with an averag…
The anaerobic degradability of natural and synthetic polyesters is investigated applying microbial consortia (3 sludges, 1 sediment) as well as individual strains isolated for this purpose. In contrast to aerobic conditions, the natural homopolyester polyhydroxybutyrate (PHB) degrades faster than the copolyester poly(…
Date of Conference: 2-5 October 2003
Two gadolinium(III) chelates, GdNP-DO3A (1-methlyene-(p-NitroPhenol)-1,4,7,10-tetraazacycloDOdecane-4,7,10-triAcetate) and GdNP-DO3AM (1-methlyene(p-NitroPhenol)-1,4,7,10-tetraazacycloDOdecane-4,7,10-triacetAMide), containing a single nitrophenolic pendant arm plus either three acetate or three amide pendant arms were…
Giant and stable worm micelles formed from poly(ethylene glycol) (PEG)-based diblock copolymer amphiphiles have the potential advantage compared to smaller assemblies for delivery of a large quantity of hydrophobic drugs or dyes per carrier. Here we show that worm micelles can be targeted to cells with internalization…
The one-pot synthesis of monolayer-protected metal nanoparticles derived from sodium S-dodecylthiosulfate (Bunte salt) in aqueous solution is described. Silver nanoparticles, which were produced by the borohydride reduction of silver nitrate in H2O, were stabilized by the adsorption of S-dodecylthiosulfate followed by…
The design of catalysts with desired chemical and thermal properties is viewed as a grand challenge for scientists and engineers. For operation at high temperatures, stability against structural transformations is a key requirement. Although doping has been found to impede degradation, the lack of atomistic understand…
The magnetic and transport properties of (Pr 1/3 Sm 2/3 ) 2/3 A 1/3 MnO 3 (A = Ca, Sr and Ba) compounds, prepared by the citrate-gel route, have been investigated. These compounds are found to crystallize in the orthorhombic structure. Charge ordering transport behaviour is indicated only in the Ca-substituted compoun…
Catalytic performance of Co catalysts supported on different supports (MgO, Al 2 O 3, SiO 2, and TiO 2 ) for the formation of carbon nanofibers through methane decomposition was investigated. Catalytic activity and the life of supported Co catalysts for methane decomposition at 773 K strongly depended on the type of c…
Vapor phase polymerization is a versatile technique that can be used to obtain highly conducting coatings of conjugated polymer on both conducting and nonconducting substrates. This is demonstrated here by preparation of polypyrrole, polybithiopene, and polyterthiopene, coatings that otherwise must be prepared electro…
The etching of the more active component from a homogeneous alloy is important in corrosion reactions and has been exploited in the synthesis of high surface area nanoporous materials. In this paper we show that nanoporous films can be obtained by selective electrochemical etching of the more noble component in a syst…
Block copolypeptides, which combine the self-assembly of block copolymers and the highly ordered 3D structures of proteins, are potential candidates for novel supramolecular structures and biotech applications, such as biosensors, tissue engineering, and selective drug delivery. The synthesis of model block copolypept…
The galvanic replacement reaction between silver and chloroauric acid has been exploited as a powerful means for preparing metal nanostructures with hollow interiors. Here, the utility of this approach is further extended to produce complex core/shell nanostructures made of metals by combining the replacement reaction…
The cavities are inherent shortcomings of XLPE insulation used in electrical cables. Their effects are to tamper the dielectric properties of the insulating material. Indeed partial discharges occur in these cavities for relatively weak electric fields. The purpose of this work is to determine by simulation, the disto…