Materials Literature
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Pergularia daemia (Forsk.) Chiov. (Asclepiadaceae), a wild plant of the arid zone of Rajasthan, hasdemonstrated significant antiinflammatory, antipyretic and analgesic activities including the release of prostaglandin. © 1998 John Wiley & Sons, Ltd.
Direct reactions of nickelocene and manganocene with molten pyrazoles in an inert atmosphere or under vacuum have led to the isolation of the following metal pyrazolate compounds: [Ni(4-Xpz) 2 ] x (where X = H, Cl and pz = pyrazolate); [M(4-Xdmpz) 2 ] x (where X = H, CH 3 , Cl, Br and M = Ni, Mn anddmpz = 3,5-dimethyl…
Surface-enhanced Raman imaging (SERI) has recently been developed as a surface imaging technique that is chemically selective, has monolayer sensitivity and can be used under ambient pressure conditions. At present, the resolution is 1–2 μm. A particularly interesting application is to image patterned self-assembled m…
Abstract Whereas pultrusion with thermoset resins has been widely analyzed, there is a scarcity of knowledge about pultrusion with thermoplastic resins. The aims of this work were to strive towards deeper knowledge of temperature distribution and degree of crystallinity in the composite during processing, to develop a…
In order to reveal the effect of grain boundaries (GBs) on cyclic deformation, the cyclically saturated dislocation patterns within grains and in the vicinity of GBs in a copper bicrystal with a large-angle GB and a copper multicrystal containing small-angle GBs have been observed by the electron channelling contrast…
Abstract One-photon excitation of one of the two porphyrins within porphyrin-tetracyanoanthraquinodimethane-porphyrin triad with picosecond laser pulse leads to single reduction of the acceptor by intramolecular electron transfer, while an additional delayed excitation of the non-excited porphyrin results in double re…
The isothermal problem of a mode I fracture of a shape memory alloy (SMA) plate is considered. Although the plate material is in the austenitic phase at a reference temperature, the martensitic transformation is triggered by high effective stresses at the tip of the crack. The phase transformation is accompanied by a…
Abstract A method is presented for assessment of lifetime of polyethylene pipes undergoing thermal oxidation (Stage III failure) based on oxidation induction time ( OIT ) data obtained by DSC. The method requires pressure testing for limited time periods, sampling from unexposed and exposed pipes, the establishment of…
The structures formed after the implantation of carbon in thermal SiO2 and annealing presented visible photoluminescence (PL) bands at room temperature. The peak and intensity of PL bands depended strongly on the temperature of annealing. In addition, very weak PL bands were observed after the implantation of argon in…
The new quaternary compounds Cs2AgVS4, K2AgVSe4, Rb2AgVSe4, Rb2AgNbS4, and Cs2AgNbSe4 were prepared using the reactive flux method. In this structure type infinite chains of edge-sharing AgQ4- and MVQ4-tetrahedra are running parallel to the crystallographic a-axis. The chains are separated by alkali cations. A linear…
The molten‐salt method has been used for low‐temperature synthesis of ceramic compounds. It has been used in the present work to determine the phase diagram of the TiO 2 ‐SnO 2 system down to 400°C, which is not possible by the conventional solid‐state annealing method. LiCl‐KCl eutectic has been used as the molten sa…
A new family of multi-block copolymers having the structure of poly(ester-carbonate)s was obtained by a chain-extension reaction involving poly(lactic-glycolic acid) oligomers (PLGA) and oligomeric α,ω-bishydroxy-terminated poly(ϵ-caprolactone)s (PCDT). The latter were first transformed into α,ω-bis(chloroformate)s, w…
A new isocyanate monomer was synthesized which contains an azobenzene dye connected to the isocyanate group via a chiral spacer. Copolymers with the achiral hexyl isocyanate were prepared by anionic polymerization with NaCN. CD measurements in solution show that the chiral center in the spacer induces a shift in the e…
Rietveld phase analysis of X‐ray powder diffraction patterns and chemical analysis by X‐ray fluorescence spectroscopy have been used to characterize a series of red and yellow ochre samples from Aboriginal ochre deposits in South and Western Australia. The ochres were found to have diverse mineralogy, being mixtures o…
Amorphous BC2N powders were prepared by mechanical milling with hexagonal boron nitride and graphite as starting materials. A bulk amorphous BC2N compound was produced by sintering the as-milled amorphous BC2N powders in a vacuum of 10−5 Torr at a temperature of 1470 K. The conductivity measurement for the bulk amorph…
Rossmanite is a new tourmaline species from near Rožná, western Moravia, Czech Republic. It forms pale pink columnar crystals about 25 mm long and 5 mm thick, elongaten along c with striations parallel to c on the prism faces. It is brittle, H= 7, D meas = 3.00 g/cm 3 , D calc = 3.06 g/cm 3 . In plane-polarized light,…
Abstract Hisingerite, first described in 1810, has been variously regarded as noncrystalline, as a septechlorite, as ferric allophane, as ferric halloysite and as poorly crystalline nontronite. Hisingerite from the original localities of Gillinge and Riddarhyttan in Sweden has a composition close to Fe 2 O 3 ·2SiO 2 2…
The crystal structures of the two polymorphic forms of the argyrodite Ag 7 PSe 6 compound are analysed by means of single-crystal X-ray diffraction. Above the phase transition at 453 K leading to the ionic conducting phase, γ-Ag 7 PSe 6 crystallizes in cubic symmetry, space group F 4¯3 m , with a = 10.838 (3) Å, V = 1…
The catalytic behavior of activated oxygen on Pd/CeO 2 - x /Al 2 O 3 catalyst as well as the synergistic effect between Pd and nonstoichiometric cerium oxide has been revealed through methane oxidation by comparison with Pd catalysts such as Pd/CeO 2 /Al 2 O 3, Pd/CeO 2 /SiO 2, Pd/Al 2 O 3, and Pd/SiO 2 catalysts. The…
Surface-enhanced Raman scattering (SERS) at an extremely high enhancement level opens up interesting and new spectroscopic possibilities. The effect combines the sensitivity of fluorescence spectroscopy with the high structural information content of Raman spectroscopy, and can be used for single molecule detection an…