Materials Literature
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The use of conjugated polymers for sensor applications continues to be the subject of intense research. In addition to their use as electronic conductors, they have been exploited as active sensing elements by coupling ligands to the backbone. In this approach, binding of an analyte results in physical distortions or…
The production of silica core-silver shell nanoparticles (silver nanoshells) by three different chemical methods is described. Each method produces a silver outer layer with a unique morphology, ranging from smooth and uniform, to rough on the 2−5 nm length scale, to spiky with extremely sharp, needlelike protrusions…
We show that a relatively simple approach for controlling the colloidal synthesis of anisotropic cadmium selenide semiconductor nanorods can be extended to the size-controlled preparation of magnetic cobalt nanorods as well as spherically shaped nanocrystals. This approach helps define a minimum feature set needed to…
Hollow tubular structures of molecular dimensions perform diverse biological functions in nature. Examples include scaffolding and packaging roles played by cytoskeletal microtubules and viral coat proteins, respectively, as well as the chemical transport and screening activities of membrane channels. In the preparati…
A series of zinc(II) and magnesium(II) alkoxides based upon a beta-diiminate ligand framework has been prepared. [(BDI-1)ZnO(i)Pr](2) [(BDI-1) = 2-((2,6-diisopropylphenyl)amido)-4-((2,6-diisopropylphenyl)imino)-2-pentene] exhibited the highest activity and stereoselectivity of the zinc complexes studied for the polyme…
Highly monodisperse CdSe nanocrystals were prepared in a three-component hexadecylamine-trioctylphosphine oxide-trioctylphosphine (HDA-TOPO-TOP) mixture. This modification of the conventional organometallic synthesis of CdSe nanocrystals in TOPO-TOP provides much better control over growth dynamics, resulting in the a…
Temperature dependence of resistivity in quasi-two-dimensional purple bronzes AMo6O17 (A=Na, K, and Tl) has been comparatively studied between 2 and 300 K at different magnetic fields. Huge positive magnetoresistance (MR) behavior below the Peierls transition temperature TP∼110 K was found in both K/Tl purple bronzes…
Peculiarities of the absorption saturation in doping superlattices with n-i-p-i crystal type structure are established. Calculations are performed in the k-selection rule model taking into account the screening of the electrostatic potential by current carriers and the density state tails.
Magnetoresistance of an insulating quasicrystalline AlPdRe film in large magnetic fields, Ralph Rosenbaum, Alexander Milner, Roland Haberkern, Peter Häussler, Eric Palm, Tim Murphy, Scott Hannahs, Bruce Brandt
Model polyurethane ionomer solution studies revealed that the critical parameters determining the solution behavior of ionomers are solvent polarity, solvent−backbone interactions, and ionic content of the ionomer. The three parameters are used to develop a novel ionomer solution diagram which provides a framework for…
We calculate the cyclization rate k(t) of a single polymer chain with charged end groups, where cyclization takes place with probability of one when the ends approach each other at a distance smaller than the reaction radius R. Using Monte Carlo simulations in a kink-jump model we show that the long-time asymptotic va…
Ferroelectric SrBi2Ta2O9 thin films on Pt/Ti/SiO2/Si were successfully synthesized by the modified polymeric precursor method. The films were deposited by spin coating and crystallized by rapid thermal annealing in a halogen lamp furnace, followed by postannealing at temperatures ranging from 700 °C to 800 °C in an ox…
A series of complexes of the type [TpRe(CO)(L D )(η 2 -ethylene)] has been synthesized, where L D is t BuNC, PMe 3, pyridine, 1-methylimidazole, or NH 3 (increasing in electron-donating ability of L D ). The rates of the propeller-like rotation of ethylene about the ethylene−rhenium bond have been determined using spi…
Transparent conducting In2O3 films were deposited on glass substrates by an oxygen ion assisted deposition. Microstructure, chemical composition, electrical, and optical properties of the deposited films were investigated as a function of arrival ratio and ion energy. At 60 eV oxygen ion bombardment, the microstructur…
In the title complex, [Zn(C(36)H(20)N(4)S(4))], the Zn(II) ion occupies a special position on an inversion centre with four-coordinate geometry. The porphyrin ring shows a wave-like conformation, with the closest interporphyrin plane separation being 3.60 (6) A. The two disordered thienyl groups are inclined with resp…
We present a simple sp 3 s* tight-binding model for use in calculating the band structures of single-walled carbon nanotubes. The 2s, 2p x , 2p y , 2p z , and s* orbitals of each carbon atom are used as the basis set for expressing the tight-binding model, and the interatom interaction between neighbouring sites is fu…
Abstract This paper is devoted to a numerical method able to help the determination of the bifurcation threshold in non‐linear time‐independent continuum mechanic problems. First, some theoretical results about uniqueness are recalled. In the framework of the large‐strain assumption, the differences between the classi…
2398-2399
Methods to chemically passivate the surfaces of amorphous-carbon films (a-C) produced by dc magnetron sputtering were studied. The chemical composition of carbon surfaces produced via sputtering are dependent upon the environment to which the carbon is exposed immediately following deposition. When the sputtered film…
We describe in detail a method by which to establish the magnetic anisotropy of thin ferromagnetic films on strongly paramagnetic substrates that are slightly anisotropic. The film that we consider is composed of the much studied manganite La0.7Ca0.3MnO3 and the substrate is NdGaO3, a good lattice match. Below a Curie…