Materials Literature
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1,4-Dioxan-2-one (DOXA) was polymerized by means of Zn L-lactate (ZnLac2) as catalyst in bulk. Upon systematic variation of the temperature, the reaction time and the monomer/catalyst (M/C) mole ratio the highest molecular weights were obtained at 100°C and M/C ratios between 2 000 and 4 000. However, long reaction ti…
The cobalt(III) complex of a Schiff base diquinone ligand CoIII(Cat-N-BQ)(Cat-N-SQ) undergoes an entropy-driven valence tautomeric equilibrium in solution yielding the CoII(Cat-N-BQ)2 species. This suggestion is supported by variable temperature electronic and 1H NMR spectra, as well as by solution magnetic susceptibi…
The cathodoluminescence of ZnO films deposited on Si substrates by reactive dc sputtering is investigated. Apart from the characteristic green emission band (522 nm) of ZnO, an ultraviolet (392 nm) band and a blue (430-460 nm) band have been observed. The x-ray diffraction and cathodoluminescent spectra reveal the dep…
Abstract This paper reviews recent studies on the mechanism of corona treatment of polyolefin films, specifically the chemical and physical changes of this process and the self‐adhesion mechanism. Corona discharge of polymeric films introduces polar groups into the surfaces, which increases the surface energy and, as…
A mathematical model has been developed to describe the dynamic heat and moisture transport behavior of clothing and its interaction with the human thermoregulation system under transient wear conditions. A modification of Gagge's two-node model is used to simulate the human physiological regulatory responses. In clot…
The growth of large (up to 0.5 cm3). single-grain R-Mg-Zn quasicrystals (R = Y, Er, Ho, Dy and Tb) from a ternary melt is described in detail. The quasicrystals grown by this technique have a composition R8.7Mg34.6Zn56.8, are thermodynamically stable and have a dodecahedral morphology with clearly visible pentagonal f…
Magnetic anisotropy of La0.7Sr0.3MnO3 thin films and single crystals has been measured using vibrating sample and torque magnetometry. The magnetic anisotropy of thin films is dominated by strain anisotropy due to the lattice mismatch between the film and SrTiO3 substrate. The two and fourfold symmetries in the (110)…
Compounds with the general formula [MM‘(C 3 H 2 O 4 ) 2 (H 2 O) 4 ] (M = Ba, Sr; M‘ = Cu, Mn; C 3 H 2 O 4 = malonate) have been synthesized and characterized. Single-crystal X-ray diffraction study on the [SrCu(C 3 H 2 O 4 ) 2 (H 2 O) 4 ] compound indicates that it crystallizes in the orthorhombic space group, Pccn, Z…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHyperbranched Poly(ε-caprolactone) Derived from Intrinsically Branched AB2 MacromonomersMikael Trollsås and James L. HedrickView Author Information NSF Center for Polymeric Interfaces and Macromolecular Assemblies (CPIMA), IBM Resea…
We have produced MnZn ferrites via high-energy ball milling (HEBM) of elemental oxides MnO, ZnO, and Fe2O3. X-ray diffraction (XRD) indicates a pure phase spinel forms after 21 h of HEBM. Extended x-ray absorption fine structure (EXAFS) analysis shows a nonequilibrium cation distribution, with an unusually high popula…
Magnesia‐phosphate cement mortars, based on magnesia and ammonium dihydrogen orthophosphate, were prepared with water contents (measured as a weight fraction of the dry material) in the range 5% to 12%. It was shown by XRD that the major reaction product was magnesium ammonium phosphate hexahydrate (MgNH 4 PO 4 6H 2 O…
Using a first-principles approach, we study the vibrational properties of vitreous ${\mathrm{SiO}}_{2}$ which are measured in neutron-scattering experiments. We adopt a model structure consisting of corner-sharing tetrahedra, which was previously generated using first-principles molecular dynamics. We calculate the dy…
Diatom analysis discriminates between the impacts on river water quality of treated urban wastewaters and diffuse nutrient sources from farmland. Evaluation of organic pollution and trophic levels in the Grand River, Ontario, using two diatom indices shows a clear differentiation among 10 sampling sites over a distanc…
Sintered Sm2(Co,Fe,Cu,Zr)17 magnets with improved high temperature performance have been obtained by reducing the iron content in the magnet alloys. A record intrinsic coercive force, HCI, of 8.3 kOe at 400 °C was obtained when the iron content was decreased to 7 wt%. At 400–600 °C, 2:17 magnets with low iron content…
Methylobacterium sp. ZP24, isolated from a local pond, is able to grow in a medium containing 12 g l-1 lactose as a sole source of carbon, giving 5.25 g l-1 biomass yield and poly-3-hydroxybutyrate (PHB) up to 59% of its dry weight in 40 h. The isolate was also able to utilize cheese whey and produce 1.1 g l-1 PHB. Ad…
The isotope effect $E\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\left({D}_{\ensuremath{\alpha}}/{D}_{\ensuremath{\beta}}\ensuremath{-}1\right)/(\sqrt{{m}_{\ensuremath{\beta}}/{m}_{\ensuremath{\alpha}}}\ensuremath{-}1)$ of cobalt diffusion in the deeply supercooled melt of the metallic alloy ${\mathrm{Zr}}_{46.…
Abstract The hydroxyl deformation modes of kaolins have been studied by Fourier transform (FT) Raman spectroscopy. Kaolinites showed well-resolved bands at 959, 938 and 915 cm −1 and an additional band at 923 cm −1 . For dickites, well-resolved bands were observed at 955, 936.5, 915 and 903 cm −1 . Halloysites showed…
A series of aliphatic poly(ester amide)s derived from 1,6-hexanediol, glycine, and diacids with a variable number of methylenes (from 2 to 8) have been synthesized and characterized. Infrared spectroscopy shows that the studied polymers present a unique kind of hydrogen bond that is established between their amide gro…
Abstract Adsorption of neutral organic molecules and the monovalent organic cations methylene blue (MB) and crystal violet (CV) to sepiolite was determined experimentally and investigated by an adsorption model. The largest amounts of MB and CV adsorbed were about 4-fold of the cation exchange capacity (CEC) of sepiol…
Due to its strong tendency to crystallize, the glass properties of mannitol cannot be measured directly. However, because mannitol can exist in a fully or partially amorphous state in drug formulations, it is important to determine the glass properties of mannitol. We obtained the glass properties of mannitol by intro…