Materials Literature
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Three unusual compounds based on polyoxometalate building blocks, [(H2O)5Na2(C6NO2H4)(C6NO2H5)3Ag2][Ag2IMo6O24(H2O)4] x 6.25H2O (1), [(H2O)4Na2(C6NO2H5)6Ag3][IMo6O24] x 6H2O (2), and (C6NO2H6)2[(C6NO2H5)2Ag][Cr(OH)6Mo6O18] x 4H2O (3), have been synthesized and characterized by elemental analysis; IR, XPS, and ESR spec…
We present results of numerical calculations of electronic states of an exciton and a trion in a CdTe quantum well at magnetic fields up to 150T. The exciton state and the trion states were computed using a variational procedure. We estimated the binding energy of the trion in a singlet state with the z-component of a…
We present a study of spin transport in charge and spin inhomogeneous semiconductor systems. In particular, we investigate the propagation of spin-polarized electrons through a boundary between two semiconductor regions with different doping concentrations. We use a theoretical and numerical method, presented in this…
We report tunneling spectroscopy measurements of the Zeeman spin splitting in InAs few-electron quantum dots. The dots are formed between two InP barriers in InAs nanowires with a wurtzite crystal structure grown by chemical beam epitaxy. The values of the electron g-factors of the first few electrons entering the dot…
Presently, the main methods for describing a non-equilibrium charge-transporting steady state are based on time-evolving it from the initial zero-current situation. An alternative class of theories would give the statistical non-equilibrium density operator from principles of statistical mechanics, in a spirit close t…
The excellent properties of transistors, wires, and sensors made from single-walled carbon nanotubes (SWNTs) make them promising candidates for use in advanced nanoelectronic systems. Gas-phase growth procedures such as the high pressure decomposition of carbon monoxide (HiPCO) method yield large quantities of small d…
By simply supporting carbon nanotubes with a metal substrate of a redox potential lower than that of the metal ions to be reduced into nanoparticles, we have developed a facile yet versatile and effective substrate-enhanced electroless deposition (SEED) method for functionalizing nanotubes with a large variety of meta…
Simulations of electron diffraction patterns for each of the known perovskite tilt systems have been performed. The conditions for the appearance of superlattice reflections arising from rotations of the octahedra are modified to take into account the effects of different tilt systems for kinematical diffraction. The…
Many structural materials (metal alloys, polymers, minerals, etc.) are formed by quenching liquids into crystalline solids. This highly nonequilibrium process often leads to polycrystalline growth patterns that are broadly termed "spherulites" because of their large-scale average spherical shape. Despite the prevalenc…
We have investigated the spin dynamics of the quasi-two-dimensional bilayer manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$, which shows colossal magnetoresistance (CMR) behavior, by inelastic neutron scattering. We have taken advantage of the recently developed multiplexing techniq…
The $^{1}\mathrm{H}$ NMR average effective spin-lattice relaxation rate $1∕{T}_{1}$ has been measured as a function of magnetic field $(4.5--15.6\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ at $T=1$ and $0.3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and as a function of temperature $(0.07--1\phantom{\rule{0.3em}{0ex}}\mathrm{…
We report a method of depositing individual 'templated carbon nanotubes' (T-CNTs) on opposing electrodes so that they are suspended across 100 µm deep trenches, and in separate experiments across low profile (70 nm thick) opposing electrodes. The geometry of the electrodes with deep trenches was chosen to be essential…
PURPOSE: To compare the signal characteristics and bolus dynamics of 1.0 M gadobutrol and 0.5 M Gd-DTPA for time-resolved, three-dimensional, contrast-enhanced (CE) MRA of the upper torso. MATERIALS AND METHODS: Ten healthy volunteers were examined with time-resolved three-dimensional CE-MRA (scan time per three-dimen…
Abstract Summary: A simple route to an ordered array of metal/semiconductor oxide composite nanodots is presented. Micellar monolayer films of polystyrene‐ block ‐poly(2‐vinyl pyridine) (PS‐ b ‐P2VP) loaded with HAuCl 4 in the P2VP nanodomains are used as templates. TiO 2 is generated selectively within the polar P2VP…
We report a detailed $^{1}\mathrm{H}$ NMR study on the spin dynamics of single molecule magnets as a function of temperature and external magnetic field. A gradual loss of the $^{1}\mathrm{H}$ NMR signal intensity (wipeout effect) is observed on decreasing the temperature for all the investigated ferromagnetic cluster…
We developed a two fluid atomizer to spray mammalian cells suspended in phosphate buffered saline (PBS)-Pluronic F-127 polymer solutions. We used the device to spray suspensions of bovine articular chondrocytes and porcine tracheal epithelial cells, in either PBS or the polymer solutions, and studied their viability a…
In an attempt to mimic the bamboo's architecture, bamboo-like polymer/silicon nanocomposites were synthesized by filling silicon nanopores with two conjugated polymers, namely poly( p -phenylene vinylene) (PPV) and its derivative poly(2-methoxy-5-(2'-ethylhexyloxy)- p -phenylene vinylene) (MEHPPV). The microstructure,…
Microporous polyvinyl chloride (PVC) with pore size of 0.2–2 µm has been obtained by the foaming of PVC powders using a solution of 2,2'-azo-bis-iso-butyronitrile in a co-solvent of butanone and cyclohexanone. The PVC/CaCO3 hybrid powders deposited with CaCO3 nanoparticles have been synthesized using the microporous P…
We applied a simple yet accurate self-consistent method using the density-functional formalism to study the field-emission properties of nanographite ribbons. We found some properties that are unique to nanostructure arrays, including the field-emission current being dominated by the contribution from off-zone-center…
Liquid anhydrous sulfuric acid forms a partly ordered structure in the presence of single-walled carbon nanotubes (SWNTs). X-ray scattering from aligned fibers immersed in acid shows the formation of molecular shells wrapped around SWNTs. Differential scanning calorimetry of SWNT-acid suspensions exhibits concentratio…