Materials Literature
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New photochromic chromenes annulated with a furan ring have been synthesized. Thus, suitable heterocyclic phenols react with different propargylic alcohols in acidic medium to give the corresponding ethers, which cyclize into benzopyrans by thermal Claisen rearrangement. This synthetic approach was found to lead to a…
Neutron diffraction and inelastic neutron scattering were used to investigate three-dimensional (3D) antiferromagnetic ordering and magnetic excitations in ${\mathrm{Pr}}_{2}$BaNi${\mathrm{O}}_{5}$, a quasi-1D mixed-spin antiferromagnet. Three distinct features of the magnetic excitation spectrum were observed above t…
Liquid crystal microlenses are prepared using various liquid crystals and dependence of the optical properties on device and material parameters is investigated experimentally. Numerical apertures of the liquid crystal microlenses for different combinations of the structure parameters and the material parameters are m…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Paula M. Wood‐Adams, John M. Dealy; Use of rheological measurements to estimate the molecular wei…
We have synthesized a new form of vanadium dioxide using the hydrothermal reaction of vanadium pentoxide and lithium hydroxide in the presence of an organic templating cation. The hydrated lithium vanadium oxide formed has the simplest layered structure of any vanadium oxide, containing only VO 5 square pyramids whose…
Abstract An evaluation on the effects of pulp and paper mill combined boiler ashes on growth and nutrient uptake by oat ( Avena sativa L., var. 501) and bean ( Phaseolus vulgaris L., var. blue pole) was conducted in a greenhouse. Ash with a calcium carbonate equivalent of 29.1% and a pH of 12.1 was applied at the rate…
Corn, tapioca, wheat, rice, and potato starches were extruded with 30% polystyrene and 5% magnesium silicate or 1% polycarbonate or 0.5% azodicarbonamide in a single screw C. W. Brabender laboratory extruder at 140°C barrel temperature, 140 rpm screw speed, and 16% starch moisture content on dry weight basis. The foam…
The recrystallisation behaviour and its effect on the crystallographic texture during solution heat treatment of thick aluminium alloy 7010 plates has been studied both on commercially hot rolled plates and on laboratory specimens deformed in plane strain compression. In addition to X-ray macrotexture analysis, indivi…
Room-temperature single-crystal X-ray structure determinations of the title compounds, namely, [(ONO2)3Lu(N,N'-bidentate)2], N,N'-bidentate = 'bpy' = 2,2'-bipyridine or 'phen' = 1,10-phenan-throline, are recorded. The complexes are isomorphous with their previously studied lanthanum analogues, being orthorhombic, Pbcn…
Phosphorus-containing flame retardants include red phosphorus, inorganic phosphates, organophosphorus compounds and chlorophosphorus compounds. These are reviewed showing chemical structure and major applica tions. U.S., Western Europe and Japanese producers are given along with their trade names. Intumescent phosphor…
The effects of thermocycle frequency, aging temperature and post-cure conditions on weight loss, microhardness and crack formation of PMR-15 neat resins were investigated. Crack formation was monitored by metallography. The molecular level changes, occurring under the same conditions, were monitored by microscopic FT-…
X-ray diffraction methods are used routinely to identify detrital and authigenic minerals in bulk powders of marine sediment. Semiquantitative bulk XRD analysis, however, is difficult. We employed a mathematical technique using matrix singular value decomposition to solve for reliable normalization factors, thereby al…
Highly oriented Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN50) thin films have been prepared using a sol‐gel method. A homogeneous and stable strontium barium niobate (Sr 1‐x Ba x Nb 2 O 6 , SBN) precursor solution could be prepared via the reaction control of metal alkoxides. The SBN precursor was stabilized by the coordination of t…
Hybrid bimetallic–TTF materials in which the organic layer adopts an unprecedented dimerized structure and the inorganic layer is formed by the first ferromagnetic Cr III –Mn II –Cr III complex are reported. These materials provide valuable information on the magnetic interactions between these metal ions which should…
In the present work we describe an investigation of the influence of low-energy ion irradiation (1-keV ${\mathrm{Ar}}^{+}$) on the surface structure of polycrystalline diamond and amorphous carbon films with various degrees of graphitization. Photoelectron spectroscopy (PES) with excitation energies in the ultraviolet…
The donor and acceptor charge-transfer transitions in YAl${\mathrm{O}}_{3}$:${\mathrm{Ti}}^{3+}$/${\mathrm{Ti}}^{4+}$ were investigated through absorption, emission, excitation, one-photon and two-photon photoconductivities, excited-state absorption, and thermoluminescence. The results are contrasted to similar studie…
Abstract In the present study the idea of five‐fold coordinated aluminium in Al 2 O 3 ‐rich aluminiumsilicate gels and glasses with compositions near to that of mullite (≈72 wt.% Al 2 O 3 , 28 wt.% SiO 2 ) is re‐aximated. Analyses of 27 AlMAS NMR spectroscopy and pair correlation functions on the basis of X‐ray diffra…
Abstract Drying of polymeric coatings often occurs under conditions where the relaxation time of polymer molecules is significant with respect to the processing time scales. The nonequilibrium thermodynamic theory of Durning and Tabor (1986) is applied to model 1‐D drying of viscoelastic solutions with concentration‐d…
An implant system that undergoes a gradual, time-dependent, nontoxic degradation process may offer an efficacious, safe, and desirable alternative to metallic materials used in the treatment of various musculoskeletal conditions. Such a scaffold may also be a suitable vehicle for growing cells and tissue in the labora…
Glasses from the RO.La 2 O 3 .B 2 O 3 (R = Mg, Ca, and Ba) systems have been examined. Glass formation is centered along the metaborate tie line, from La(BO 2 ) 3 to R(BO 2 ) 2 . Glasses generally have transition temperatures >60°C and expansion coefficients between 60 × 10 ‐7 /°C and 100 × 10 ‐7 /°C. Raman and sol…