Alumina ceramics for ballistic protection. Part 1
High-alumina and alumina-zirconia ceramics have been successfully used as armor material for personnel and vehicular ballistic protection.
Materials Literature
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Polyelectrolyte multilayer films modulate cytoskeletal organization in chondrosarcoma cells
The aim of this study was to evaluate polyelectrolyte multilayer films as interfaces for implants. Polyelectrolyte multilayers were built up with different terminating layers by alternate deposition of oppositely charged polyelectrolytes on which chondrosarcoma (HCS-2/8) cells were grown in the presence of serum. Film…
Performance of Solid Oxide Fuel Cells with LSGM-LSM Composite Cathodes
Anode-supported cells comprising zirconia (YSZ) anode, thin YSZ electrolyte, and composite cathodes containing a mixture of (LSM) and (LSGM) were fabricated. The relative proportions of LSGM and LSM were varied between 30 wt % % LSM and 70 wt % % LSM, while the firing temperature was varied between 1000 and 1200°C. Th…
Ni Catalyst for Hydrogen Conversion in Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells
A gadolinia-doped ceria (CG4) is considered as anode material for solid oxide fuel cells with an yttria-stabilized zirconia electrolyte. Symmetrical cells are mounted in a novel setup geometry with auxiliary electrodes to avoid concentration polarization outside the electrode structure. The polarization resistance in…
Study of the formation of mesoporous titania via a template approach and of subsequent Li insertion
Mesostructured titania was prepared according to Rao et al. using dodecylamine as the amine template. X-Ray absorption spectroscopy was used to study changes in the Ti local coordination environment during formation of the mesoporous material—starting from the alkoxide precursor, followed by hydrolysis and condensatio…
Synthesis, Spectra and Photophysics of some Free Base Tetrafluoroalkyl and Tetrafluoroaryl Porphyrins with Potential Applications in Imaging¶
The synthesis, characterization and photophysical properties of two perfluoroalkyl (5,10,15,20-tetrakis-[trifluoromethyl]- and [heptafluoropropyl]-porphyrin) and two perfluoroaryl (5,10,15,20-tetrakis-[2,6-difluorophenyl]- and [pentafluorophenyl]-porphyrin) are described, with reference to their potential in both phot…
Porphyrins in 1,3-Dipolar Cycloaddition Reactions: Synthesis of a Novel Pyrazoline-fused Chlorin and a Pyrazole-fused Porphyrin
β-Nitro-meso-tetraphenylporphyrin reacts with diazomethane to give a pyrazoline-fused chlorin as the main product. This compound was converted into the corresponding pyrazole-fused porphyrin, by treatment with DBU, and into a methanochlorin by refluxing in toluene.
Biofilm architecture of Phanerozoic cryptic carbonate marine veneers
Research Article| January 01, 2002 Biofilm architecture of Phanerozoic cryptic carbonate marine veneers Robert Riding Robert Riding 1Department of Earth Sciences, Cardiff University, Cardiff CF10 3YE, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Robert Riding 1Departme…
Carbon dioxide extraction of residual chloroform from biodegradable polymers
Biodegradable polymeric devices for drug delivery and tissue engineering are often fabricated with the use of organic solvents and may still contain significant amounts of solvent (> 1 wt%) even after aggressive vacuum drying. This excess solvent can interfere with tissue response and the mechanical properties of the…
Signature of the Meyer–Neldel rule on the correlated barrier-hopping model
In this study, a modified model for bipolaron correlated barrier hopping (CBH) is proposed, since the usual bipolaron CBH model has been found to be inconsistent with experimental data for ac conductivity for chalcogenide glasses at high temperatures. The present model is based on the existence of a focal point when t…
Influence of Zirconium Alloy Chemical Composition on Microstructure Formation and Irradiation Induced Growth
The studies of the dislocation structure, phase, and microchemical compositions of alloy Zr-1Nb-1.2Sn-0.35Fe (E635) and its modifications containing Fe from 0.15 to 0.65% were carried out before and after research reactor irradiation at ∼350°C to maximal fluence of ∼1027 m-2 (E > 0.1 MeV) and at ∼60°C. The size…
Thermal conductivity measurements of epoxy systems at low temperature
We have developed a specific thermal conductivity measurement facility for solid materials at low temperature (LHe and LN2). At present, the Measurement of Thermal Conductivity of Insulators (MECTI) facility performs measurements on epoxy resin, as well as on bulk materials such as aluminum alloy and on insulators dev…
Oxygen Permeability and Ionic Conductivity of Perovskite-Related La[sub 0.3]Sr[sub 0.7]Fe(Ga)O[sub 3−δ]
Oxygen Permeability and Ionic Conductivity of Perovskite-Related La0.3Sr0.7Fe ( Ga ) O 3 − δ , Kharton, V. V., Yaremchenko, A. A., Viskup, A. P., Patrakeev, M. V., Leonidov, I. A., Kozhevnikov, V. L., Figueiredo, F. M., Shaulo, A. L., Naumovich, E. N., Marques, F. M. B.
The Effect of pH and Surfactant on the Aggregation Behavior of Chlorin p6: A Fluorescence Spectroscopic Study¶
Steady state and time-resolved fluorescence properties of chlorin P6, a potential drug for photodynamic therapy, have been investigated as functions of pH. A decrease in pH of the medium has been shown to cause protonation of the ionizable carboxylic acid side chain, leading to an increase in hydrophobicity and conseq…
High-Strain-Rate Superplasticity in an AZ91 Magnesium Alloy Processed by Ingot Metallurgy Route
High-strain-rate superplastic magnesium alloy, AZ91, was processed through the ingot metallurgy route. The relationship between working temperature and resulting grain size indicated that the grain size tends to decrease with decreasing working temperature in AZ91. Based on this preliminary result, the ingot was hot e…
Oil resistant thermoplastic elastomers of nitrile rubber and high density polyethylene blends
Abstract Different grades of oil resistant thermoplastic elastomers (TPE) based on blends of nitrile rubber (NBR) and high density polyethylene (HDPE) have been developed. Chemical treatment of HDPE to evolve compatibility with NBR and dynamic vulcanization with different curatives have been studied. Determination of…
Trialkylphosphine oxide/amine stabilised silver nanocrystals—the importance of steric factors and Lewis basicity in capping agents
The preparation of specifically passivated silver quantum dots is reported. Investigations into the surface-capping agents have highlighted the importance of both the chain length and bonding strength of the individual ligands. Capping agents traditionally utilised to stabilise semiconductor quantum dots cannot always…
Magnets in medicine
As permanent magnet materials have developed, attempts have been made to take advantage of their improved properties in medical applications. Uses of magnets in medical applications range from their simple use for retention, through orthopaedics and fracture healing, to magnetomotive artificial hearts and pioneering b…
The release of diazepam from poly(hydroxybutyrate-hydroxyvalerate) microspheres
Microspheres based on a poly(hydroxybutyrate-hydroxyvalerate) copolymer (PHBV) (Mw = 630kD, 21% mol HV) were loaded with diazepam using different emulsion-solvent evaporation processes. Gelatin was used as a strategy to alter the release profile of the incorporated drug. The mean diameter of microspheres was from 30-4…
Bis(rylenedicarboximide)-a,d-1,5-diaminoanthraquinones as unique infrared absorbing dyes
A hitherto unknown class of dyestuff compounds exhibiting three key characteristics, namely absorption in the near infrared (NIR) region, high photostability and good processability, is described.