Materials Literature
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Part 1 Fibre, whisker and particulate-reinforced ceramic composites: Fibrous monolithic ceramics Whisker reinforced silicon nitride ceramics Fibre reinforced glass/glass-ceramic matrix composites Particulate composites. Part 2 Graded and layered composites: Functionally-graded ceramic composites SiAlON based functiona…
The influence of shear flow on the temperature evolution of the specific volume and the crystalline morphology of two iPP's, differing in weight-averaged molar mass M̄ w, was investigated at nonisothermal conditions and elevated pressures, using a custom-designed dilatometer. These conditions are typically in the rang…
Abstract The sorption of carbon dioxide in poly(lactic acid) (PLA) was studied by quartz crystal microbalance at high pressures. To address the effect of the D isomer present in the polymer on the gas sorption, measurements were performed in PLA with two different L:D contents, 80:20 and 98:2. New data for the solubil…
Abstract Summary: Multifunctional hyperbranched polyether polyols bearing protective poly(ethylene glycol) (PEG) chains with or without the folate targeting ligand at their end have been prepared. Solubilization in these polymers of a fluorescent probe, pyrene, and an anticancer drug, tamoxifen, was physicochemically…
A series of hybrid organic/inorganic triblock copolymers of polystyrene−butadiene−polystyrene (SBS) grafted with polyhedral oligomeric silsesquioxane (POSS) molecules with different chemical constituents were synthesized by a hydrosilation method. Four POSS macromers, R‘R 7 Si 8 O 12, were designed to contain a single…
Hydrogen-terminated diamond can exhibit a pronounced two-dimensional hole conductivity when it is exposed to appropriate adsorbates. This phenomenon was first encountered in the form of the so-called hydrogen-induced surface conductivity but is meanwhile understood as a novel kind of doping mechanism by which the surf…
FeCo-codoped ZnO nanowires were synthesized by in situ doping with iron and cobalt using a chemical vapor deposition method. Structure and compositional analysis indicated that the as-prepared nanowires were single- crystalline and FeCo codoped. No FeCo clusters and other secondary phases were found in the nanowires.…
To obtain organic nanowire sensors with high sensitivity and rapid response times, based on the inducement effect of surfactants during in situ polymerization, nanostructured polyaniline composites are obtained by using a chemical oxidation method by adding a small amount of surfactant. A casting method is employed on…
Natural biominerals often have exquisite morphologies, where the cells exercise a high degree of crystallographic control through secretion of biological macromolecules and regulation of ion transport. One important example is the sea urchin spine. It has recently been shown to be formed through deposition of a transi…
Optical absorption and emission spectra were performed for Dy 3+ ions doped alkali tellurofluorophosphate glasses. The intensity parameters from the measured oscillator strengths were evaluated using the Judd–Ofelt (J–O) theory. The observed and calculated oscillator strengths ( f ) are found to be in reasonable agree…
We have performed molecular dynamics simulations of 0% and 90% acetylated fifth-generation (G5) polyamidoamine (PAMAM) dendrimers in water and methanol and obtained radii of gyration of 2.51-2.57 and 2.11-2.33 nm, respectively, similar to those measured experimentally in methanol by Prosa et al. (J. Polym. Sci. 1997,…
In the present work, starting from elemental bismuth, antimony and tellurium powders, p-type 25%Bi 2 Te 3 –75%Sb 2 Te 3 thermoelectric materials with high density were prepared by mechanical alloying (MA) and plasma activated sintering (PAS). The single phase 25%Bi 2 Te 3 –75%Sb 2 Te 3 alloys were obtained after MA fo…
Two new iron(III) oxalatophosphates, Cs2Fe(C2O4)(0.5)(HPO4)2 (1) and CsFe(C2O4)(0.5)(H2PO4)(HPO4) (2), have been synthesized by using a low melting point eutectic mixture of choline chloride and malonic acid as a solvent and characterized by single-crystal X-ray diffraction and magnetic susceptibility. Crystal data ar…
Abstract Spider silk is considered as the basis of a new family of high performance fibers that would reproduce the excellent mechanical properties of the silk, in particular its extreme toughness. However, it has been observed that the mechanical properties of spider silk are severely influenced by humid environments…
The uptake of polyelectrolyte multilayer coated colloids into cells, subsequent defoliation and plasmid delivery was studied by means of confocal microscopy and flow cytometry. Silica particles coated layer-wise with protamine and dextran sulfate were given to HEK 293T cells. Optimum uptake was found with protamine as…
CoxMg3-x/Al hydrotalcite-like compounds (where x=0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0) were synthesized by the coprecipitation method and characterized by the XRD and TGA techniques. Incorporation of Co for x=0.0-3.0 gradually decreased the transformation temperature of the hydrotalcites to the corresponding oxides from…
Five new polyoxometalate compounds built on lacunary Wells-Dawson anions and trivalent lanthanide cations, KNa3[Nd2(H2O)10(alpha2-P2W17O61)].11H2O (1), (H3O)[Nd3(H2O)17(alpha2-P2W17O61)].6.75H2O (2), (H2bpy)2[Nd2(H2O)9 (alpha2-P2W17O61)].4.5H2O (3), (H2bpy)2[La2(H2O)9(alpha2-P2W17O61)].4.5H2O (4), and (H2bpy)2[Eu2(H2O…
Conducting polymers are suitable as electrode materials for high performance supercapacitors because of their high specific capacitance and high dc conductivity in the charged state. Ion beam (energy >1 MeV) irradiation of materials is a novel technique to modify their properties. Polyaniline conducting polymer thin f…
Kinetics of the formation of large-scale supramolecular structure and its long-time stability were investigated in detail in solutions of electrolytes, nonelectrolytes, and mixtures of liquids. This structure comprises submicron-sized domains (large clusters) with higher solute concentration than in the rest of soluti…
Oxidative polymerization studies of N-functionalized dithieno[3,2- b:2‘,3‘- d ]pyrroles (where substituent = hexyl, octyl, decyl, octadecyl, tert -butyl, 2-ethylhexyl, or p -hexylphenyl) via both chemical oxidation and electropolymerization are presented. While electropolymerized samples are insoluble, it is possible…