Materials Literature
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A new beamline for macromolecular crystallography has been constructed and is currently under commissioning. Its source is the high-power wiggler at the 2 GeV storage ring ELETTRA. The optics consists of a double-crystal monochromator in nondispersive configuration followed by a toroidal focusing mirror, and is design…
We present a study of the pinning of a contact line on a surface discontinuity lying on the boundary between two surfaces with different wettabilities. We examine here the case of a non-rectilinear boundary which is the most frequent case as has been shown by AFM. The observation of liquid fronts pinned on the frontie…
Phase transformations in the Al70Co15Ni15 decagonal quasicrystal (DQC), induced by 120 keV Ar + ion irradiation at room temperature, have been studied by means of transmission electron microscopy. The transformation behaviour is dependent on the dose, the dose rate and the thickness of the specimen. In the Ar+-ion-aff…
${\mathrm{CaYAlO}}_{4}$ crystals codoped with ${\mathrm{V}}^{4+}$ and ${\mathrm{Mg}}^{2+}$ ions have been grown in an inert atmosphere. EPR measurements reveal that ${\mathrm{V}}^{4+}$ ions in ${\mathrm{CaYAlO}}_{4}$ occupy orthorhombic symmetry sites. The optical-absorption spectrum comprises two intense bands with p…
Development and Application of Accurate Detection and Assay Techniques for Oilfield Scale Inhibitors in Produced Water Samples G.M. Graham; G.M. Graham Heriot-Watt U. Search for other works by this author on: This Site Google Scholar K.S. Sorbie; K.S. Sorbie Heriot-Watt U. Search for other works by this author on: Thi…
Mössbauer, far-infrared, and X-ray photoemission spectroscopy (XPS) studies have been made on doped (SnCl 2 or SnCl 4 ) (PEFl) and polyphenylacetylene (PPA). The nature of the tin as it is incorporated into the polymer is examined. The resistance values of the doped polymers are followed with relative humidity. Result…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Nitrogen Donors with .mu.3-Imidoyl Triosmium Clusters: Dynamics of a Monometallic Site in a Trimetallic ClusterShariff E. Kabir, Edward Rosenberg, Mike Day, Kenneth Hardcastle, Erich Wolf, and Tim McPhillipsCite this: Organometallics 1995, 14, 2, 721–733Publicat…
The influence of Al-deoxidation and various amounts of sulphur on Ca-treated steel has been investigated. The effect of sulphur ar aluminium on the modification of oxide inclusions has been reasoned by theoretical thermodynamic equilibrium analysis. The type inclusion formed depends on the aluminium and sulphur conten…
Alternating current (AC) impedance spectroscopy was applied to measure the degradation of steel coatings previously exposed to corrosive solutions such as tap water and 3% sodium chloride (NaCl). The method used was simple and quick and did not utilize electrochemical (potentiostatic) control. Previously immersed spec…
The reflectance of sintered powders and single crystals of cupric oxide (CuO) has been measured from \ensuremath{\approxeq}50 to 3000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ as a function of temperature, above and below the magnetic-ordering transitions. For the sintered materials, the effect of $^{65}\mathrm{Cu}$…
An in vitro continuous flow system with whole human blood was used to study blood-biomaterial interactions on a base polyurethane and three modified surfaces in the presence and absence of circulating Staphylococcus epidermidis. We hypothesized that the composition of the protein layer adsorbed on the surface of the b…
The Efficiency of a DTPA-Based Solvent in the Dissolution of Barium Sulfate Scale Deposits Andrew Putnis; Andrew Putnis U. of Cambridge Search for other works by this author on: This Site Google Scholar C.V. Putnis; C.V. Putnis U. of Cambridge Search for other works by this author on: This Site Google Scholar J.M. Pau…
The phase transition and the crystal structures of Bi 2 Ti 4 O 11 have been investigated by X-ray diffraction. The compounds possess the following parameters: α-Bi 2 Ti 4 O 11 : monoclinic, space group C2/c, a = 14.5999 (6), b = 3.8063 (2), c = 14.9418 (8) A, β = 93.129(4)°, V = 829.1(1)A 3 , Z = 4, D x = 6.29 g cm −3…
Crimp is generally conceived of as a ribbon, i.e. a planar periodic orientation variation of collagen fibers. This study was carried out to demonstrate that crimps are complex structures with the possibility of being helically arranged. Thick sections, imbibed in glycerol or even in mineral oil and studied under the p…
The syntheses and crystal structures of the following paratungstates-Z with different alkaline cations are reported and discussed: Na 10 [H 2 W 12 O 42 ] · 20H 2 O (I), Na 10 [H 2 W 12 O 42 ] · 27H 2 O (II), Na 10 [H 2 W 12 O 47 ] · 28H 2 O (III), K 10 [H 2 W 12 O 42 ] · 10H 2 O (IV), K 6 Na 4 [H 2 W 12 O 42 ] · 13H 2…
Thin films often exhibit a spontaneous breaking of chiral symmetry. This symmetry breaking can occur on two distinct length scales. On a microscopic scale, nonchiral molecules can pack in a chiral structure. On a macroscopic scale, a striped texture can buckle to form a spiral. Using continuum elastic theory and Monte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structural Characterization of Reduced Ternary Tantalum Oxides in the Tetragonal Tungsten Bronze StructureChristopher R. Feger and R. P. ZiebarthCite this: Chem. Mater. 1995, 7, 2, 373–378Publication Date (Print):February 1, 1995Publication History Published on…
We have quantitatively measured the temperature dependence of the local distortions of PbTiO3, crystals below and above the structural ferroelectric phase transition using X-ray Absorption Fine Structure (XAFS) measurements. Both Pb and Ti edges were measured, providing quantitative determinations of the displacements…
The field-induced spin-density-wave state in (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$, where TMTSF is tetramethyltetraselenafulvalene, develops because the field diminishes the ``antinesting'' terms, ${\mathit{t}}_{\mathit{b}}^{\mathcal{'}}$, to restore the spin-density wave (SDW) that would exist at ${\mathit{t}}_{\mathit…
Abstract The alteration experiments of phlogopite with 0.01 N HCl solution containing 0.1 M NaCl at 50°, 80° and 120°C have been carried out to aid in the understanding of the dissolution process of mica and the formation of secondary phases such as vermiculite and interstratified mica/vermiculite. Twenty milligrams o…