Quasiperiodic packings of two-shell decagonal clusters
We present some mathematical results concerning the strip projection method and a computer program for generating quasiperiodic packings of decagonal two shell-clusters.
Materials Literature
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Single ion scattering contributions to the thermal conductivity of LiHoF_4 and LiY_{96%}Ho_{4%}F_4
We have performed extensive zero-field thermal conductivity measurements on single crystal samples of \LiHoF and \LiYHoF below $2.3 K$. By comparing these data to a single ion scattering model, we have shown that the thermal conductivity of \LiYHoF is dominated by simple single-ion scattering while that of \LiHoF show…
Role of CDW fluctuations on the spectral function in a metallic CDW system
Angle-resolved photoemission spectroscopy of ZrTe3 has been performed from room temperature(T) down to 6 K (across Tcdw = 63K) to study the charge-density-wave (CDW) fluctuation effects in a metallic CDW compound having Fermi surface (FS) sheets with differing dimensionality. While spectra on the 3-dimensional(D) FS s…
Quantum Tunneling of Magnetization in Lanthanide Single‐Molecule Magnets: Bis(phthalocyaninato)terbium and Bis(phthalocyaninato)dysprosium Anions
Staircase-like structures in the hysteresis loops at 0.04 K (see picture) are shown by doped single crystals of TBA[(Pc)2]− (Pc=phthalocyaninato, TBA=tetrabutylammonium), the first lanthanide single-molecule magnet. They are assigned to resonant quantum tunneling of magnetization between entangled states of the electr…
Diffraction-induced coherence levels
We examined the influence of complex diffraction effects on low-coherence fringes created for high-aspect depth-to-width ratio structures called trenches. The coherence function was analyzed for these micrometer-wide trenches and was registered with a white-light interference microscope. For some types of surface stru…
Shape Transition of Nanostructures created on Si(100) surfaces after MeV Implantation
We have studied the modification in the Surface morphology of the Si(100) surfaces after 1.5 MeV Sb implantation. Scanning Probe Microscopy has been utilized to investigate the ion implanted surfaces. We observe the formation of nano-sized defect features on the Si surfaces for various fluences. These nanostructures a…
Theoretical Study of the Suicide Inhibition Mechanism of the Enzyme Pyruvate Formate Lyase by Methacrylate
The determination of pyruvate formate lyase crystallographic structure brought new insights to its mechanism of reaction and presented the possibility of a direct attack to the substrate from cysteine 418 as opposed to the previously expected cysteine 419. An inhibition study performed by Knappe and co-workers, using…
Iron Nanoparticles Derived from Iron-Complexed Polymethylglutarimide To Produce High-Quality Lithographically Defined Single-Walled Carbon Nanotubes
A polymer, PMGI, serves as a template to generate uniformly distributed iron nanoparticles with controlled size. These nanoparticles have proven to be excellent catalysts for generating carbon nanotubes (CNTs). The catalyst locations can be defined by a single photolithography step for spatially selective growth of CN…
Organization of Rigid Wedge−Flexible Coil Block Copolymers into Liquid Crystalline Assembly
The synthesis and characterization of wedge−coil block molecules with a poly(ethylene oxide) coil of 77 ( 1a ), 91 ( 1b ), 114 ( 1c ), and 182 ( 1d ) ethylene oxide units are described. The self-assembling behavior of these block polymers in the melt state was investigated by optical polarized microscopy, differential…
Cu–Pd/β-Zeolites as Highly Selective Catalysts for the Hydrogenation of Nitrate with Hydrogen to Harmless Products
Abstract Cu–Pd/β-zeolites (BEA) are excellent catalysts for the selective hydrogenation of NO3− with H2 to harmless products. 1.2 wt % Cu–1.0 wt % Pd/BEA shows a high selectivity for N2 + N2O (14 and 80% at 278 K, respectively), while suppressing NH3 production (6%, 3 ppm from 200 ppm of NO3−). By coupling the catalys…
Characterization of the Electronic Excited-State Energetics and Solution Structure of Lanthanide(III) Complexes with the Polypyridine Ligand 6,6‘-Bis[bis(2-pyridylmethyl)aminomethyl]-2,2‘-bipyridine
Absorption, emission, and excitation spectra for solid-state and solution of Tb(III), Dy(III), and Gd(III) complexes with the polypyridine ligand 6,6'-bis[bis(2-pyridylmethyl)-aminomethyl]-2,2'-bipyridine (C36H34N8) are presented. Measurements of excited-state lifetimes and quantum yields in various solvents at room t…
Controlled Confinement and Release of Gases in Single-Walled Carbon Nanotube Bundles
A simple procedure is described that locks small quantities of SF6, CO2, and 13CO2 into opened single-walled carbon nanotube (SWNT) bundles and keeps the gas in the SWNTs above the desorption temperature of these molecules. The technique involves opening the SWNTs with ozonolysis at 300 K followed by vacuum-annealing…
Natural Rubber/In Situ Silica Nanocomposite of a High Silica Content
Abstract By using n-hexylamine as a catalyst of sol–gel reaction of tetraethoxysilane in uncured natural rubber matrix, spherical silica particles of ca. 46 nm were homogeneously generated in situ at a high content, i.e., 71 parts per one hundred rubbers by weight. The mechanical properties of this soft nanocomposite…
Photochromism of Spiropyran Nanocrystals Embedded in Sol−Gel Matrices
Spectroscopic and kinetic properties of a new photochromic medium, consisting of nanocrystals of spyropyran molecules (1,3-dihydro-1,3,3,5',6',pentamethyl-spiro[2H-indole-2,2'-[2H]pyrano [3,2-b]pyridinium] iodide) embedded in an organo-silicate sol-gel film, are presented and compared to microcrystals obtained by slow…
Design and Synthesis of New Polymeric Materials for Organic Nonvolatile Electrical Bistable Storage Devices: Poly(biphenylmethylene)s
The synthesis of new polymers, poly(biphenylmethylene)s, derived from bistriflates of bisphenol-type monomers, by Ni(0)-mediated polymerization has been presented. These polymers are interesting because of the nature of the polymer backbone that contains biphenyl units separated by substituted methylene units. The sol…
Characterization of Mo Deposited on a TiO2(110) Surface by Scanning Tunneling Microscopy and Auger Electron Spectroscopy
The properties of Mo ultrathin films deposited on a TiO2(110) surface were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS), as well as by Auger electron spectroscopy (AES). The substrate exhibited mainly large (1 x 1) terraces decorated by additional [001] rows (missing or added 1D structure…
Morphology of Adsorbed Polymers and Solid Surface Wettability
The adsorption of a polyacrylamide (MW 14600) and two polysaccharides (MW 9260 and 706 x 10(3)) onto model silica surfaces of different hydrophobicities was investigated. In all cases, adsorption adhered to the Freundlich isotherm, reflecting the heterogeneous character of the solid substrates. The latter strongly inf…
Investigation of Crystallization in a Jet Y-Mixer by a Hybrid Computational Fluid Dynamics and Process Simulation Approach
A hybrid approach incorporating a computational fluid dynamics (CFD) package and process simulation tool was employed to simulate the steady-state crystallization of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) in a Y-mixer crystallizer. Mixing effect was intensively investigated through the three-dimensiona…
Peculiar Magnetic Transition Behaviour Around 208 K in One-dimensional Nickel(III) Chain Complex [1-(4′-Vinylbenzyl)pyridinium][Ni(mnt)2] (mnt2− = Maleonitriledithiolate)
Abstract A new ion-pair complex, [VBzPy][Ni(mnt)2], where [VBzPy]+ = 1-(4′-vinylbenzyl)pyridinium and mnt2− = maleonitriledithiolate, has been synthesized. The cations and anions stack into completely separated columns and Ni(III) ions form a uniformly spaced one-dimensional (1-D) zigzag chain within a [Ni(mnt)2]− col…
Self-directed Assembly of Photoactive Perylenediimide-Bridged Silsesquioxane into a Superlong Tubular Structure
Introduction of photoactive perylenediimides into the self-directed supramolecular silsesquioxane systems gives superlong tubular structure with length of several hundred micrometers and diameters ranging from 1 to 9 μm as determined by FE-SEM. XRD demonstrated that the wall of the tubes arranged in lamellar structure…