Materials Literature
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Abstract Block copolymers were synthesized by ring‐opening polymerization of L ‐lactide or D ‐lactide in the presence of mono‐ or dihydroxyl poly(ethylene glycol), using zinc metal as catalyst. The resulting copolymers were characterized by various techniques, namely 1 H NMR spectroscopy, differential scanning calorim…
In this, the last of a series of three papers, we discuss a method of forming iron phosphate ceramics by a reduction process. We report the formation of iron oxide ceramics by reducing hematite with iron in a phosphoric acid solution. The reaction results in a rapid‐setting ceramic (at room temperature) with a compres…
Abstract: Impact tensile properties of three different wrought magnesium alloys (AZ31B‐F, AZ61A‐F and ZK60A‐T5) are evaluated using the split Hopkinson bar. Reliable tensile stress–strain data up to fracture in the extrusion direction at strain rates of nearly 1000 s −1 are presented and compared with those at quasi‐s…
Phase transitions in Ti-6Al-4V were studied by means of high temperature X-ray diffraction using a resistance heated furnace in high vacuum and Cu Kα radiation. The α and β phases could be observed conveniently using the (10.0), (00.2) and (10.1) peaks of the α structure and the (110) peak of the β. The phase composit…
Four species of biraphid pennate diatoms (Craticula cuspidata (Kützing) D.G. Mann, Stauroneis phoenicenteron (Nitzsch) Ehrenberg, Nitzschia linearis (Agardh) W. Smith, and Pinnularia viridis (Nitzsch) Ehrenberg) were studied to determine the effect of temperature changes on their motility and adhesion to the substratu…
PURPOSE: To evaluate the imaging potential of ferumoxytol, a new superparamagnetic iron oxide colloidal blood pool contrast agent. MATERIALS AND METHODS: Magnetic resonance (MR) imaging at 1.5 Tesla was performed before and after intravenous injection of ferumoxytol using escalating doses of 0.4, 0.8, 1.2 and 1.6 mg F…
Precise and accurate knowledge of the optical properties of amorphous silica is important because of the increasing application of SiO 2 in optical and electrooptical devices, including photolithography masks for semiconductor fabrication, recently as a potential 157 nm mask substrate. The optical properties in the va…
We have previously reported that L-proline has cryoprotective activity in Saccharomyces cerevisiae. A freeze-tolerant mutant with L-proline accumulation was recently shown to carry an allele of the PRO1 gene encoding gamma-glutamyl kinase, which resulted in a single amino acid substitution (Asp154Asn). Interestingly,…
This is the second of three papers on a dissolution model that describes the formation of chemically bonded phosphate ceramics. In this paper, we discuss the kinetics of formation of aluminum phosphate ceramics between 100° and 150°C. Using basic thermodynamic formulations, we calculated the temperatures of maximum so…
The stability and water exchange dynamics of gadolinium (GdIII) complexes are critical characteristics that determine their effectiveness as contrast agents for magnetic resonance imaging (MRI). A new heteropodal GdIII chelate, [Gd-TREN-bis(6-Me-HOPO)-(TAM-TRI)(H2O)2] (Gd-2), is presented which is based on a hydroxypy…
The synthesis and structural characterization of microporous lanthanide silicates (Na(1.08)K(0.5)Ln(1.14)Si(3)O(8.5).1.78H(2)O, Ln = Eu, Tb, Sm, Ce) are reported. The structure of these solids is closely related with the structure of hydrated calcium silicate minerals known as tobermorites and was solved by powder X-r…
Species based diatom investigations are an essential component of the four new periphyton based methods developed for river quality assessment in Austria since 1993. The monitoring methods based on all Austria data allow (A) a first approach to assess ecological quality based on all algae including diatoms by means of…
Bifunctionalized poly(amidoamine) dendrimers having both quaternary ammonium groups and primary amines on their periphery were prepared. Pd and Pt nanoparticles were encapsulated within these dendrimers by extraction of the metal ions into their interior, followed by chemical reduction. The high positive charge on the…
A hydrolyzed silane ((C 2 H 5 O) 3 Si−(CH 2 ) 3 −NH 2 ) was anchored on the surface of silica nanoparticles, forming silica-immobilized silane. After calcination, the silane-modified silica (M-silica) can attract heteropoly acid (HPA) efficiently. It has been shown that the presence of water in the atmosphere is neces…
Abstract In this work, the behaviour of biocomposites obtained by the addition of flax cellulose pulp to Mater‐Bi®, a commercial thermoplastic matrix based on starch, has been studied in comparison with traditional glass fibre composites. The composites were produced by compounding with a twin‐screw extruder. Dependin…
Abstract Delphi Corporation and the BMW Group are developing Solid Oxide Fuel Cell (SOFC) technology for application in the automotive industry as an on‐board Auxiliary Power Unit (APU). Delphi is part of the US‐DOE SECA initiative and is working with Battelle to develop SOFC for multiple applications including the au…
This paper elucidates the effects of cell density on the volume expansion behavior of polypropylene (PP) foams blown with butane in extrusion. The cell density was controlled by varying the talc content, and foam expansion was observed at a fixed blowing agent content while varying the melt and die temperatures. As ob…
Solvent exchange caused reversible variations in color, magnetic properties, and the Faraday spectra of Co(II)(1.5)[Cr(III)(CN)(6)].7.5H2O (1) prepared in water. Compound 1 turned from peach to deep blue, which was due to a change in the coordination geometry on Co(II) ion from six-coordinate pseudo-octahedral (OhCo(I…
Currently most developments in the area of natural fibre reinforced composites have focused on random discontinuous fibre composite systems. The development of continuous fibre reinforced composites is, however, essential for manufacturing materials, which can be used in load-bearing/structural applications. The main…
Reaction of A-alpha-PW(9)O(34)(9)(-) with YCl(3) in an aqueous Na(2)CO(3) solution produces a dianion-encapsulated A-type sandwich polyoxometalate, (YOH(2))(3)(CO(3))(A-alpha-PW(9)O(34))(2)(11)(-). The X-ray structure of this complex reveals that three Y(III) ions are sandwiched between two A-alpha-PW(9)O(34)(9)(-) mo…