Materials Literature
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A characteristic change in the dielectric properties with A-site substitution is known in complex perovskite compounds, (Ba, Sr)(B', B")O 3 , which are expected to be applied to dielectric resonators. Recently, a phase transformation upon tilting of oxygen octahedra has been found in some of the compounds. However the…
CdS and CdSe nanoparticles were prepared in organic solvents in the presence of poly(N-vinyl-2-pyrrolidone) (PVP). PVP plays an essential role in preventing the flocculation of concentrated nanoparticles (stabilizing effect), and in controlling the particle size under the influence of the solvent used. FT-IR measureme…
Abstract Interfacial polycondensation is an important polymerization technique that encapsulates a variety of active principles. Mechanisms governing the reaction and interplay of physical and chemical rate processes need to be understood for both rational design of reaction equipment and the process control to produc…
Ferroelectric domain structures of as-grown KTiOP${\mathrm{O}}_{4}$ crystals are observed on polished polar surfaces by the scanning secondary-electron microscopy (SEM) method. The results demonstrate a different contrast origin for domain boundaries and domains themselves. It is shown that the electron-beam irradiati…
As a continued effort to improve the performance of low energy scanning electron probe systems for application in microscopy, lithography, metrology, etc., miniaturized electron beam columns, approximately 3 mm in length, demonstrating a probe size of 10 nm with a beam current of ≥1 nA at 1 keV, have been successfully…
The optical textures exhibited by the mesophases of three compounds, all of which are reported to show the biaxial nematic phase, have been examined. The textures are of the usual nematic schlieren type, except that they consist entirely of disclinations of strength |s| = 1/2. It is suggested that the absence of discl…
A 3.2-kbp PstI fragment of DNA encoding formamidase from the methylotrophic bacterium Methylophilus methylotrophus which had previously been cloned (pNW3) [Wyborn, N.R., Scherr, D.J. & Jones, C.W. (1994) Microbiology 140, 191-195], was subcloned as a 2.3 kbp HindIII fragment (pNW323). Nucleotide sequencing showed that…
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…