Materials Literature
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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…
Results for the late-time regime of phase ordering in three dimensions are reported, based on numerical integration of the time-dependent Ginzburg-Landau equation with nonconserved order parameter at zero temperature. For very large systems ($700^3$) at late times, $t \ge 150,$ the characteristic length grows as a pow…
Our simulations of polymer crystallization from solutions show that (1) entropic barriers control the selection of the initial lamellar thickness, (2) growth at the crystalline interface is chain adsorption followed by crystallographic registry, and (3) lamellar thickening is a highly cooperative process requiring the…
Systematic changes in the chemistry of evaporated seawater contained in primary fluid inclusions in marine halites indicate that seawater chemistry has fluctuated during the Phanerozoic. The fluctuations are in phase with oscillations in seafloor spreading rates, volcanism, global sea level, and the primary mineralogi…
Abstract A systematic study of the current efficiency (CE) in a laboratory aluminium cell with SnO 2 -based inert anodes was carried out by measuring the overall amount of oxygen relieved at the anode, using two different methods. Inert ceramic anodes of 96% SnO 2 , 2% Sb 2 O 3 , 2% CuO in wt% composition were prepare…
The dynamic conduction of bismuth-containing oxide layered ceramics of the composition Sr 2 Bi 2 TiNb 2 O 12 is investigated in a weak alternating field at frequencies of 0.5–500 kHz in the temperature range 300–700 K. It is demonstrated that the high-temperature conduction can be adequately described in terms of theo…