Materials Literature
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Abstract In this paper, several drug carriers were fabricated to release the hydrophilic 5‐fluorouracil (5‐Fu), such as blend of polylactide (PLA) with different molecular weights and blends of PLA with polycaprolactone (PCL) or poly(ethylene glycol) (PEG). The controlled release devices were processed into tablets co…
General Electric has developed SiC fiber-reinforced SiC-Si matrix composites produced by silicon melt infiltration for use in gas turbine engine applications. High temperature, high-pressure combustion rig testing, and engine testing has been performed on combustor liners and turbine shrouds made from such MI composit…
The environments for oxygen sites in crystalline V(2)O(5) and in layered vanadia gels produced via sol-gel synthesis have been investigated using (17)O MAS and 3QMAS NMR. For crystalline V(2)O(5), three structural oxygen sites were observed: V=O (vanadyl), V(2)O (doubly coordinated), and V(3)O (triply coordinated). Li…
Abstract In an earlier publication we showed that the optical haze properties of blown and cast polyethylene (PE) films were adversely affected (i.e., haze increased) as a result of enhanced surface roughness caused by the formation of distinct optically anisotropic “spherulitic‐like” superstructures. In this report w…
Differential absorption spectroscopy shows a characteristic dependence on the density of 1s excitons in ${\mathrm{Cu}}_{2}\mathrm{O}$ at low temperature. The relation between absorption change and 1s exciton density is established and calibrated using one- and two-photon excitation. The calibrated density evaluation i…
We present exact diagonalization results on a modified Peierls-Hubbard model for the neutral-ionic phase transition. The ground state potential energy surface and the infrared intensity of the Peierls mode point to a strong, nonlinear electron-phonon coupling, with effects that are dominated by the proximity to the el…
The emergence of fuel cell systems and hybrid fuel cell systems requires the evolution of analysis strategies for evaluating thermodynamic performance and directing design and development. A description and application of the recently developed tool for analyzing tubular SOFC based systems is presented. The capabiliti…
Tetralkylammonium and sodium decatungstates have been heterogenized on silica. The so-obtained materials have been characterized by UV−vis and Fourier transform infrared spectroscopies, N 2 adsorption experiments, and measurements of surface polarity. Both the anion W 10 O 32 4- and the countercations are anchored on…
The LaFe 11.5 Si 1.5 H 1.3 interstitial compound has been prepared. Its Curie temperature T C (288 K) has been adjusted to around room temperature and the maximal magnetic entropy change (|Δ S |~17.0 J·kg -1 ·K -1 at T C ) is larger than that of Gd (|Δ S |~9.8 J·kg -1 ·K -1 at T C =293 K) by ~73.5% under a magnetic ch…
Abstract The effect of energy of corona discharge treatment (CDT) on the physico‐chemistry of the surface of a polyester film was investigated systematically using a number of complementary surface analytical techniques: contact angle analysis, x‐ray photoelectron spectroscopy, time‐of‐flight secondary ion mass spectr…
The Me3SiX-induced Mukaiyama aldol reaction proceeds through each catalytic cycle under the influence of X-: the silyl group of Me3SiNTf2 does not release from -NTf2 and that of silyl enol ether intermolecularly transfers to the product, while the silyl group of Me3SiOTf remains in the product and that of the silyl en…
Abstract The accumulation of adventitious carbon on Al and Au–Al alloy surfaces has been studied using XPS across a wide range of water vapour and air exposures. Carbon growth undergoes several discrete changes with the increase of exposure dose. X‐ray irradiation effects on carbon growth were also investigated. Under…
Abstract Blends of polypropylene homopolymer (PP) and metallocene produced ethylene‐octene copolymer (EOR) with a bimodal particle size distribution were investigated. The aim of the work was to study the influences of EOR characteristics and its concentration on the tensile and impact properties of the blends. The ma…
The hexagonal (H1) lyotropic liquid crystalline phases of C16EO8 (octaethyleneglycol monohexadecyl ether) and Brij® 56 non-ionic surfactants have been used to template the electrochemical deposition of nanostructured palladium films. The resulting H1-e palladium films were characterised by SEM, TEM and X-ray. The film…
We have studied an anionic ligand effect in iron porphyrin complex-catalyzed competitive epoxidations of cis- and trans-stilbenes by various terminal oxidants and found that the ratios of cis- to trans-stilbene oxide products formed in competitive epoxidations were markedly dependent on the ligating nature of the anio…
Magnetic properties of (Ga,Mn)As/GaAs superlattices are investigated. The structures contain magnetic (Ga,Mn)As layers, separated by thin layers of non-magnetic GaAs spacer. The short period Ga$_{0.93}$Mn$_{0.07}$As/GaAs superlattices exhibit a paramagnetic-to-ferromagnetic phase transition close to 60K, for thickness…
We present the results of low temperature (LT) annealing studies of Ga1-xMnxAs epilayers grown by low temperature molecular beam epitaxy in a wide range of Mn concentrations (0.01
We report a new fabrication method of a thin polymer film with regular array of micropores (honeycomb film). A honeycomb film was fabricated by depositing a dilute solution of an amphiphilic polymer on water surface. The honeycomb film transferred onto a solid substrate was characterized by atomic force microscopy. By…
Nanocrystalline ceria (CeO2) particles have been successfully prepared via sonochemical and microwave assisted heating routes from aqueous solutions containing (NH4)2Ce(NO3)6, hexamethylenetetramine and poly (ethylene glycol)-19000 (PEG). The products were characterized by techniques such as powder X-ray diffraction,…
Nanocrystal up-conversion phosphors (UCP), ytterbium- and erbium-codoped lanthanum molybdate (La 2 (MoO 4 ) 3:Yb,Er), were prepared for the first time for potential uses in bioassays especially in biochip-based analysis. The La 2 (MoO 4 ) 3:Yb,Er nanocrystals, with an average diameter of 50 nm, were prepared via a hyd…