Materials Literature
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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…
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…
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…
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 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.
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 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…
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…
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…
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…
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…
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.
Acrylic resins have been used in many different applications in dentistry, especially in the fabrication of provisional fixed partial dentures. Ideally, a provisional crown and bridge material should be easy to handle and should protect teeth against physical, chemical, and thermal injuries. Some of the problems assoc…
A series of eighteen new ‘push–pull’ molecules obtained by self-assembly of salicylideniminophenols and various phenylboronic acids is reported. Electric field-induced second-harmonic measurements of the nonlinear optical response reveal that the nature of the phenylboron moieties has a modest influence on the molecul…
Two composite systems, “Ag” and “Ag–S” nanoparticles in silica films, were approached by using two different synthesis routes, namely sol–gel and ion implantation. Silica composites containing embedded nanosized silver- and silver sulfide-crystallites were obtained by the sol–gel process. The formation of silver nanog…
We report a novel method for the preparation of well-defined metallic nanoparticles, which is illustrated with the technologically important example of palladium nanoparticles dispersed in gamma-alumina.
Transmission electron microscopy (TEM) was used to examine Zircaloy fuel ladding, either discharged from several PWRs and a BWR after irradiation to fluence levels of 3.3 to 8.6 × 1021 n cm-2 (E > 1 MeV) or hydrogen-charged and heat-treated under stress to produce radial hydrides; the goal was to determine the…
Self-diffusion along dislocations in ultra high purity iron containing 0.5–1.2 mass ppm carbon, 0.1–1.0 mass ppm nitrogen and 1.8–4.0 mass ppm oxygen has been studied by the radioactive tracer method with the sputter-microsectioning technique. Below 700 K, the self-diffusion coefficient along dislocations has been det…
Using the Mitsunobu reaction as a key step, a general and efficient method for the synthesis of EDOT monomers has been developed. Novel substituted EDOTs and the first chiral derivatives were generated in high yields.
Abstract We describe various molecular switching processes occurring in several types of inorganic solids: spin cross-over (SC) compounds, photomagnetic Prussian blue analogs (PBAs), and valence-tautomeric system. Their thermo-, photo-, piezo-, and magneto-chromic properties are illustrated by recent examples. A commo…