Materials Literature
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Carboxylic acids, particularly fatty acids, are by far the most important surface modification systems for inorganic fillers used in the plastics and rubber industries. However, relatively little is understood regarding factors that affect their adsorption behaviour, including the interplay between acid molecular stru…
A facile synthesis of an optically active di-isocyanate containing alkylene groups and a preformed imide structure is described. Polycondensation reactions of the prepared di-isocyanate with pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, and hexafluoroisopropylidene diphthalic anhydride resulted i…
Anhydrous theophylline was prepared by heating theophylline monohydrate at temperatures between 60 degrees C and 140 degrees C. The effects of dehydration temperatures on the moisture absorption and dissolution behavior of anhydrous theophylline were investigated in this study. The hydration rate of anhydrous theophyl…
A series of bis(4-thio-1,8-naphthalic anhydride)s and the corresponding bis(N-amino naphthalimide) derivatives were synthesized from readily available compounds in high yield. A series of novel poly(thioether-naphthalimide)s, which utilized hydrazine as the diamine, were synthesized by a one-step polymerization reacti…
The objective of this study was designed to elucidate the importance of adding pluronics to PCL microparticles for the delivery of proteins. The influences of the type and the amount of pluronic on the surface morphology and release properties of protein-loaded PCL microparticles were evaluated. Microparticles were pr…
We review our recent X-ray scattering studies of charge and orbital order in doped manganites, with specific emphasis on the role of orbital correlations in Pr1-xCaxMnO3. For x=0.25, we find an orbital structure indistinguishable from the undoped structure and long-range orbital order at low temperatures. For dopings…
Replacement of divalent Sr 2 + ions by monovalent K + ions in La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 ( LSGM ) decreases the electrical conductivity of LSGM and increases the activation energy to 1.42 eV. Substitution of La by substantial amounts of up to 50 atom % of Pr in LSGM yields new mixed oxide ion and electronic co…
The processing response of a 70% silicon nitride–30% barium aluminum silicate (70%‐Si 3 N 4 –30%‐BAS) ceramic‐matrix composite was studied using pressureless sintering, at temperatures ranging from 1740°C, which is below the melting point of BAS, to 1950°C. The relationship between the processing parameters and the mi…
Barium ferrite (BaFe12O19), lithium ferrite (Li0.5Fe2.5O4) and magnesium zinc ferrite (Mg0.5Zn0.5Fe2O4) have been prepared by self-propagating high-temperature synthesis (SHS) reactions from iron, iron(III) oxide and metal oxides and peroxides. The driving force for the reactions is the oxidation of iron powder. React…
The modeling of magnetic components for use in electrical circuit simulation requires that the core material be accurately characterized. This paper investigates a method of extracting parameters to model the hysteresis behavior of magnetic core materials and optimizing them to achieve accurate results during circuit…
The syntheses of three new salen ligands that are tethered to a p-acylthio(phenylacetylene)n linker are described. The two key steps in the syntheses are coupling of the p-acylthio(phenylacetylene)n linker (n = 0–2) with a 5-iodosalicylaldehyde and the subsequent condensation of the aldehyde moiety of the formed adduc…
Two novel chiral (bola)amphiphilic oligo(p-phenylenevinylene)s (OPVs) have been synthesised and fully characterised. Decoration of the hydrophobic OPV backbone with a hydrophilic tris[tetra(ethylene oxide)]benzene wedge on one side and a hydrophobic tris(alkoxy)benzene wedge on the other side, resulted in amphiphilic…
The interaction of the noble metals Pd and Pt with the {111} and {011} surfaces of cubic-ZrO2 was examined by employing pseudo-potential plane-wave calculations within two Hamiltonians: the LDA and Perdew–Wang91 (GGA). The most favourable adsorption sites, adsorption energies, density of states and electron-charge den…
We create polymer liquid crystals (PLCs) on a computer and subject them to constant-force tensile deformations. Molecular dynamics simulation procedure is used and graphical models and animations of crack formation and propagation as a function of time are generated. Special attention is given to realistic rigid LC is…
Contact-angle measurements, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS or ESCA) were used to characterize flame-treated biaxially oriented polypropylene (PP) films. While the surface of PP treated in a fuel-lean flame is highly oxidized, no watersoluble low-molecular-weight oxidized mater…
The appearance of self-organized structures on elastomer surfaces owing to the combined treatment of ionizing radiation and mechanical strain is described. For example, ion bombardment of stretched elastomer surfaces after subsequent relaxation of the polymer results in a self-organized, undulating surface topology, w…
A cerium dioxide (CeO2) film with characteristic cubic lattice and optical band gap energy has been deposited chemically onto a non-conductive glass substrate at 333 K by simple immersion into an aqueous solution containing hydrous cerium(III) nitrate and dimethylamineborane (DMAB).
A new series of sodium/potassium salts of sandwich-type [Mn+3(H2O)x(BiW9O33)2](18 − 3n)− heteropolyanions (Mn+ = (VO)II, x = 0 (1) and Mn+ = CrIII (2), MnII (3), FeIII (4), CoII (5), NiII (6), CuII (7), x = 3) were synthesized and characterized by means of elemental analyses, thermogravimetry, FT-IR, UV-VIS, EPR and H…
This volume reviews the metal and ammonium formate solubility data published up to 1995. So far as the editors are aware, all the solubility data published during this period have been reviewed. Preference has been given to data published in numerical form. Data that appeared only in graphical form may not appear in t…
The influence of different hosts, processing conditions and conducting fillers on the percolation threshold (Φc) of the resulting conducting blends was investigated. Results indicate that microscopic properties, such as the dipole moments of the side-groups, and distribution of these groups on the host polymer backbon…