Ability of PMMA To Improve the PC/PVDF Interfacial Adhesion
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Materials Literature
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Kinetics of Cellulose Digestion by Fibrobacter succinogenes S85
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 technique for measurement of pretilt angles arising from alignment layers
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 III. Morphologies and contrast ratios of polymer dispersed liquid crystals
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…
Chirped GaAs-AlAs distributed Bragg reflectors for high brightness yellow-green light-emitting diodes
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…
Simulation of shear stress in icosahedral quasicrystals
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…
Hydrothermal Crystallization of Ammonium-Saponite at 200 °C and Autogenous Water Pressure
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…
Preparation of Transparent TS-1 Zeolite Film by Using Nanosized TS-1 Particles
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…
Unusual Gas-Transport Selectivity in a Partially Oxidized Form of the Conductive Polymer Polypyrrole
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 of the magnetic interaction in alkalithioferrates(III)
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,…
Adsorption of End-Functionalized Poly(ethylene oxide)s to the Poly(ethylene oxide)−Air Interface
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…
Magnetotransport in epitaxial thin films of the magnetic perovskitePr0.5Sr0.5MnO3
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…
Influence of Cu 2 O and CuAlO 2 Interphases on Crack Propagation at Cu/α‐Al 2 O 3 Interfaces
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…
Structural Study of the Gel Phase of a Semifluorinated Alkane in a Mixed Solvent
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…
Injection and compression molding of polystyrene/high‐density polyethylene blends—phase morphology and tensile behavior
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…
Concentration dependence of phonon mode frequencies and the Grüneisen coefficients in BaxSr1−xTiO3 solid solutions
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…
Nucleation and Crystal Growth of Octacalcium Phosphate on Titanium Oxide Surfaces
The nucleation and growth of octacalcium phosphate (Ca 4 H(PO 4 ) 3 ·2.5H 2 O, OCP) on titanium oxide (TiO 2 ) particles have been investigated using constant composition (CC) methods in aqueous solution at 37 °C. The solid phases during the reaction were examined by X-ray diffraction, scanning electron microscopy (SE…
Na-ion transport in borate and germanate glasses and liquids:A23Na and11B NMR spin-lattice-relaxation study
The temperature dependence of the spin-lattice relaxation times (${\mathrm{T}}_{1}$ ) of $^{23}$ Na and $^{11}$ B nuclides has been studied in a number of Na-borate and -germanate glasses and liquids in order to understand the effects of the type of network, concentration of the modifying cation, and network former-mo…
Effects of fluorination extent and direction of ester group in semiperfluorinated phenyl benzoate FLCs on mesomorphic properties
An achiral semiperfluorinated chain has been introduced into classical phenyl benzoate mesogenic moieties in which the other terminal chain is chiral. The consequences of this modification on the mesomorphic properties are discussed. At a low fluorination extent, the smectic A phase is strongly favoured, while at high…
Use of Ferroelectric Hysteresis Parameters for Evaluation of Niobium Effects in Lead Zirconate Titanate Thin Films
The effects of niobium doping on the hysteresis parameters of sol—gel Pb 1.1−(x/2) (Zr 0.53 Ti 0.47 ) 1−x Nb x O 3 (0, x, 0.05) have been reported for two sets of films with analogous grain size and degree of (111) texture but with different surface microstructures. For both sets, a strong continuous decay of the remn…