Materials Literature
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Transition metals are well known as optically active dopants in crystalline hosts because they fluoresce broadly in the near-IR; examples include Ti<SUP>3+</SUP>:sapphire (Al<SUB>2</SUB>O<SUB>3</SUB>) and Cr<SUP>4+</SUP>:forsterite (Mg<SUB>2</SUB>SiO<SUB>4</SUB>). Because transition element ions yield stronger optical…
A synthetic unsymmetrical 1-galactosamide bolaamphiphile self-assembles in methanol to form a multilayer structure comprising unsymmetrical monolayer lipid membranes linked via a sugar-carboxylic acid H-bonding interface.
The synthesis and characterization of a copper(I) complex containing two-coordinated chelating verdazyl radicals are described. The structure (shown) consists of a distorted tetrahedral geometry at the copper ion; the angle between the planes defined by the two verdazyl rings is nearly 116°. Variable-temperature magne…
The interactions between organic matter and clay minerals are among the most widespread reactions in nature. The adsorption of organic material by clay miner als has been widely investigated during the last decade and has been extensively reviewed (see, e.g., Weiss, 1969; Mortland, 1970; Theng, 1974, 1979; Yariv and…
We study the recently observed orbital excitations, orbitons, and treat electron-electron correlations and lattice dynamics on an equal footing. It is shown that the orbiton energy and dispersion are determined by both correlations and lattice vibrations. The electron-phonon coupling causes satellite structures in the…
Biodegradable scaffolds serve a central role in many strategies for engineering tissue replacements or in guiding tissue regeneration. Typically, these scaffolds function to create and maintain a space and to provide a support for cell adhesion. However, these scaffolds also can serve as vehicles for the delivery of b…
By considering the catalytic mechanisms underlying the formation of various nanocarbon deposits on catalytic metal surfaces, we conclude that the majority of these mechanisms include some common steps. The most important of these is the nucleation of the carbon deposit on the metal surface. On the basis of experimenta…
High-temperature atomic force microscopy (AFM) was used for in-situ monitoring of melt−crystallization of poly(ethylene terephthalate) (PET) at 233 °C. The observed evolution of the lamellar structure allowed identification of the stack thickening process at the secondary crystallization stage. This finding explains t…
With the number of cerium doped radiation resistant glasses available to the designer of space optics rapidly decreasing, it is critical to identify and characterize all potential sources of radiation resistant glasses and crystals. Unfortunately much of the data on radiation testing of glasses is quite old and often…
We describe the synthesis, characterization, and properties of polystyrene- block -poly(ethylene- alt -propylene)- block -polyethylene (PS- b -PEP- b -PE) and polystyrene- block -poly(ethylene- alt -propylene)- block -polystyrene (PS- b -PEP- b -PS) triblock copolymers. Morphological investigations using TEM, SEM, and…
In-situ deposited thin films of the conducting polymer poly-3,4-ethylenedioxythiophene (PEDOT) have been prepared on hydrophilic and hydrophobic substrates and characterized by UV-Vis spectroscopy, atomic force microscopy and resistivity measurements.
The oligomerization of lysozyme in aqueous solution was investigated by Monte Carlo simulations as a function of protein concentration, pH, and electrolyte screening. Lysozyme was modeled as a hard sphere with embedded pH-dependent discrete charges and with an attractive 1/ r 6 -potential representing nonspecific shor…
Reaction of the diferric sandwich-type polyoxometalate (NaOH(2))(2)Fe(III)(2)(P(2)W(15)O(56))(2)(16-)(1) with excess aqueous Cu(II) or Co(II) yields a new type of d-electron-metal substituted polyoxometalate, [TM(II)Fe(III)(2)(P(2)W(15)O(56)) (P(2)TM(II)(2)W(13)O(52))](16-), TM = Cu (2), Co (3), respectively. The stru…
We have measured high-energy-resolution Fe $2p$ photoelectron spectra for $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}/\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}(0001)$ grown by oxygen-plasma-assisted molecular-beam epitaxy at emission angles chosen to enhance bulk and su…
We report a systematic study of 〈100〉 epitaxial films of magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$ of thickness 300--2000 \AA{}, grown on single-crystal substrates (MgO, ${\mathrm{MgAl}}_{2}{\mathrm{O}}_{4},$ and ${\mathrm{SrTiO}}_{3}$) using pulsed laser deposition. The magnetic state was explored by measuring…
Investigations into replacing Me2Cd as a common precursor for the synthesis of CdSe nanoparticles by pyrolysis in a hot coordinating solvent have proven that more stable, less volatile or even crystalline organometallic cadmium compounds can be used instead of Me2Cd. Dineopentylcadmium, bis(3-diethylaminopropyl)cadmiu…
The modification of bundled single-walled and multiwalled carbon nanotubes is examined using a combination of computational and experimental methods. The computational approach is classical molecular dynamics simulations using the many-body reactive empirical bond-order potential parametrized by Brenner. The simulatio…
We present a comprehensive theoretical investigation of the electron-phonon contribution to the lifetime broadening of the surface states on Cu(111) and Ag(111), in comparison with high-resolution photoemission results. The calculations, including electron and phonon states of the bulk and the surface, resolve the rel…
The valence band structure of the layered transition metal dichalcogenide ${\mathrm{WS}}_{2}$ has been determined experimentally by angle resolved photoelectron spectroscopy and theoretically by augmented spherical wave band structure calculations as based on density functional theory. Good agreement between experimen…
We investigate the indirect generation of the partial width of the $ω(782)$ meson with respect to the reaction $ω(782) \to ρ(770) π\toπ^+π^-π^0$ within the context of a ``Unitary Effective Resonance Model'' (UERM), which has previously been applied to resonant fermionic field operators, here extended to scalar, pseudo…