Materials Literature
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Abstract Treatment of acute burn wounds with silver sulfadiazine has raised concern of potential silver toxicity. As the wound heals, a barrier forms between the silver sulfadiazine and the blood, but this membrane is not impenetrable, and so silver absorption is still possible. In this work, we have modeled chemical…
Hydrotalcite-like compounds (HTLCs) having low (<5%) carbonate content and high (XAl > 0.33) layer charge can be synthesized under ambient pressure and atmosphere. This new approach uses terephthalate anions and manipulation of suspension pH to increase the substitution of Al for Mg in the octahedral sheet. Unit-cell…
Abstract Smectite and mixed-layer illite/smectite (I/S) in Triassic heulandite-rich bentonite from Kaka Point, New Zealand, have been investigated by scanning electron microscopy (SEM), transmission electron microscopy/analytical electron microscopy (TEM/AEM) and X-raydiffraction (XRD) for comparison with matrix phyll…
The photo-oxidation of germanium (Ge) nanostructures deposited by the cluster-beam evaporation technique is systematically studied. The significant photo-oxidation is found in the Ge-liquid nitrogen temperature (LNT) film, which was deposited on substrates whose temperature was kept at liquid nitrogen temperature duri…
peer reviewed
Growing cultures of Fibrobacter succinogenes S85 digested cellulose at a rapid rate, but nongrowing cells and cell extracts did not have detectable crystalline cellulase activity. Cells that had been growing exponentially on cellobiose initiated cellulose digestion and succinate production immediately, and cellulose-d…
A well-controlled, reproducible alignment with or without a pretilt angle is a basic need for the development of any kind of liquid crystal display. We have built an optical set-up based on the crystal rotation method. With this system we can measure the pretilt angle in nontwisted liquid crystal samples. Presentation…
Polymerization induced phase separation in mixtures of liquid crystals (LCs) and acrylates (Merck TL205/PN393) proceeds by liquid-gel demixing, in most cases of practical interest. At high LC content or low temperature of polymerization liquid-liquid separation cannot be excluded. Depending on the elasticity and homog…
A novel chirped distributed Bragg reflector (CDBR) structure was grown by metal-organic chemical vapor deposition (MOCVD) on a GaAs substrate where the optical thickness of each pair decreases monotonically from the bottom of the structure to the top surface. It was found that the fabricated CDBR structure can reflect…
By a numerical relaxation scheme we have simulated the plastic deformation of a quasicrystal. Shear stress was applied to a quasiperiodic icosahedral atomic configuration of Lennard-Jones particles, and nucleation of dislocation dipoles was observed which move in a slip plane. We also found climb motion and dissociati…
Abstract The effects of reaction time (2 to 72 h) and NH 4 + /A1 3+ molar ratio (1.6, 2.4 and 3.2) on the hydrothermal synthesis of ammonium-saponites are investigated. The gels are obtained by mixing powders, resulting in a stoichiometric composition, Mg 3 Si 34 Al 0.6 O 10 (OH) 2 , with aqueous ammonium solutions, w…
We report the first success in the preparation of transparent TS-1 zeolite film on a micro slide glass using nanosized TS-1 zeolite crystals (<100 nm). The nanosized TS-1 zeolite was crystallized at 80 °C and 1 atm. We intentionally controlled the zeolite particle size by using mild synthetic conditions and particle m…
Prior investigations have shown that polypyrrole has low gas-transport selectivity. This has been attributed to the microporous morphology obtained when thin films of this polymer are prepared by conventional synthetic methods. In this paper we show that polypyrrole with a dense (as opposed to microporous) morphology…
Quantum chemical ab initio calculations for two ternary thioferrate crystals, Na5FeS4 and Na3FeS3, have been performed. Using a cluster model approach with 250 optimized point charges for the single well-isolated complexes [FeS4]5− and [Fe2S6]6−, the electronic and magnetic properties are investigated. In particular,…
Samples with one or both ends of monodisperse poly(ethylene oxide) (PEO) functionalized with perfluorodecanoyl groups (PEO F or PEO 2F ) were synthesized and blends of these end-capped PEOs with PEOs of the same molecular weight ( M n ∼2000 to ∼16 000 K) were prepared as cast films. As-cast and annealed samples were a…
Thin, c-\ensuremath{\rightarrow}-axis oriented films of the magnetic perovskite ${\mathrm{Pr}}_{0.5}$${\mathrm{Sr}}_{0.5}$${\mathrm{MnO}}_{3}$ were prepared by dc-magnetron sputtering, structurally characterized by x-ray diffraction and their physical properties investigated by magnetization and electrical transport m…
In‐situ crack‐propagation experiments, in conjunction with thermochemical experiments, have been used to examine the role of discontinuous interphases on the fracture behavior of solid‐state diffusion‐bonded Cu/α‐Al 2 O 3 couples. Clean, interphase‐free interfaces exhibit crack extension by brittle decohesion at the c…
Semifluorinated n -alkanes, F 3 C(CF 2 ) m -1 (CH 2 ) n -1 CH 3 (for short, F m H n ) are short-chain diblock copolymers that show interesting properties when dissolved in nonaqueous media. Due to the high incompatibility between fluorocarbons and hydrocarbons that produces strong immiscibility between fluorocarbons a…
Abstract Processing and compatibilization effects on the phase morphology and the tensile behavior of blends of polystyrene and high‐density polyethylene (PS/HDPE) were investigated. As predicted by theory, high shear rates encountered during extrusion blending led to efficient minor phase emulsification in immiscible…
A study of the Raman spectra of BaTiO 3 -SrTiO 3 solid solutions has yielded information on the dependence of phonon mode frequencies on component concentration. The contribution to the dependences by the change in lattice volume through the Grüneisen coefficients, and the term connected directly with the solid soluti…