Materials Literature
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Two layered vanadyl selenites with the compositions, [DABCOH2]0.5[(VIVO)(HSeO3)(SeO3)].H2O,I, and [enH2][(VivO)2-(VVO)O2(SeO3)3]-.1.25H2O, II, have been prepared by the reaction of NaVO3 with SeO2 or H2SeO4 under hydrothermal conditions in the presence of organic amines. Crystal data: I, orthorhombic, space group Pbcn…
Using a quasi-Monte Carlo scheme, we search the potential energy surface of crystalline pentacene to sample its local minima, which represent the “inherent” structures, i.e., the possible configurations of mechanical equilibrium. The system is described in terms of rigid molecules interacting through a standard atom–a…
Remanent polarizations (Pr) of 200-nm-thick epitaxial Pb(Zr0.35,Ti0.65)O3 (PZT) thin films deposited on (001), (110), and (111) SrTiO3 (STO) substrates coated with SrRuO3 (SRO) were compared to the domain configurations that were precisely and quantitatively characterized by high-resolution x-ray diffraction reciproca…
High-purity boron nitride (BN) nanofibers with diameters ranging from 30 to 100 nm were synthesized. Electron energy loss spectroscopy revealed that they have stoichiometric BN composition. The hydrogen uptake capacity measurements showed that the fibers could adsorb 2.9 wt % hydrogen under ∼10 MPa at room temperature…
The electron transport properties of three-terminal carbon-nanotube junctions are investigated within the Landauer theory of quantum conductance. Using a realistic tight-binding Hamiltonian, we demonstrate that the experimentally observed rectifying behavior is not an intrinsic property of the junction, but rather of…
Numerical simulation models to analyze the expansion behavior of the interconnector and the resulting stresses under the cell operating conditions were proposed. This model calculation was the first precise analysis including most phenomena which should be considered in terms of stress and mechanical reliability of th…
Measurement of optical properties such as the refractive index and thickness of nanocrystalline or smooth diamond films is carried out by the prism coupling technique. The films observed to be absorbing for a standard operating wavelength of 633 nm and higher wavelengths, i.e., 830 and 1300 nm, were used to obtain sha…
We use an instanton approximation to the continuous-time spin coherent-state path integral to obtain the tunnel splitting of classically degenerate ground states. We show that provided the fluctuation determinant is carefully evaluated, the path integral expression is accurate to order O(1/j). We apply the method to t…
Polymer architecture plays an important role in the solution, rheological, mechanical and processing behavior. In this series of two papers, we explore the role of branching, especially branch density, on the conformation and rheology of homopolymers. A series of model star-core hyperbranched polystyrenes (HBPS) with…
The two-electron reduction/oxidation reactions of manganese oxide in alkaline electrolytes have been investigated in the presence and absence of bismuth oxide by both galvanostatic discharge/charge and linear sweep voltammetry followed by examining the products with X-ray diffraction. Although the presence of bismuth…
Thermal properties and mechanical strength of ceramic fuel-cell components are critical in allowing for rapid start-up and operational stability at high temperatures of solid oxide fuel cell (SOFC) systems. Tubular SOFC electrolytes were prepared using a plastic extrusion technique from a dough containing the electrol…
We demonstrate the functionalization of single-walled carbon nanotubes (SWNTs) using a glow discharge for generating atomic or molecular radicals. A 30-s exposure to a cold plasma of H2 results in near-saturation coverage of SWNT with atomic hydrogen. Functionalization of SWNTs with atomic hydrogen is confirmed by an…
In this work, evidence of copper diffusion paths is shown with fine scanning electron microscopy failure analysis after electromigration failures in single damascene interconnect structures. For the polycrystalline grain structures, it is established that grain-boundary diffusion occurred, although experimental electr…
The (R)-specific enoyl coenzyme A hydratase ((R)-hydratase) from Aeromonas caviae catalyzes the addition of a water molecule to trans-2-enoyl coenzyme A (CoA), with a chain-length of 4-6 carbons, to produce the corresponding (R)-3-hydroxyacyl-CoA. It forms a dimer of identical subunits with a molecular weight of about…
The increase in industrial interest in the incorporation of alkoxysilanes in organic polymer coatings arises from their ability to form self-cross-linkable films at room temperature. In the past few years, many patents were published, offering solutions for avoiding premature cross-linking of alkoxysilane-containing l…
A model-based comparison of thermal and plasma chemical vapor deposition (CVD) techniques for the growth of carbon nanotubes (CNTs) from methane feedstock is presented. In thermal CVD, the feedstock does not dissociate in the gas phase at temperatures commonly used for single- and multiwalled CNT growth (⩽900 °C) and…
Ceramic samples of Tb3+ and Ce3+ singly doped and co-doped CaAl2O4 with 0.1 and 1 at. % doping concentrations have been prepared. The emission of the Ce3+ singly doped sample is at 413 nm. The persistence time of its afterglow is longer than 10 h. The strongest emission of the Tb3+ singly doped sample is at 543 nm and…
Photoluminescence (PL) measurements were performed on a series of hydrogenated amorphous silicon oxynitride and silicon nitride films with different nitrogen contents deposited by plasma-enhanced chemical-vapor deposition. From the PL and PL excitation spectra, the Urbach energy of the sample is found to be proportion…
A new differential scanning calorimeter (DSC) sample cell has allowed for the analysis of lithium-ion battery electrolytes at high temperatures. These welded stainless-steel sample tubes contain any decomposition gases that typically leak from conventional hermetically sealed DSC sample pans. Electrolytes of in ethyle…
In this Account, I will describe the discoveries of a series of stable quasicrystals in which I participated during the past 15 years. These discoveries led to a paradigm shift in the field of quasicrystals. The story started when I was a graduate student, has continued into the present, and may continue into the futu…