Materials Literature
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Metallooctaphyrin-Komplexe: Zweifache Metallierung eines perfluorierten [36]Octaphyrins mit Kupfer(II) führt zur hydrolytischen Öffnung eines Pyrrolrings (siehe Struktur) . Mit Silberionen lieferten das perfluorierte [36]Octaphyrin und ein meso-Pentafluorphenyl-substituiertes [36]Octaphyrin dagegen Disilber(I)-Komplex…
Abstract Scale control is conventionally achieved by the use of chemical inhibitors, introduced to the production system either by squeeze treatment into the reservoir or continual injection into the well. However, as new field developments encounter more challenging production environments or when the associated econ…
The resultant thermoelectric power factors P of three types of Cu∕Bi∕Cu,Ni∕Bi∕Ni, and Cu∕Bi∕Ni composite materials welded with Bi were measured at 298 K as a function of relative thickness of Bi and compared with P values calculated by treating these devices as an electrical and thermal circuit. It was first demonstra…
Nanoscale heat conduction across tunnel junctions prepared through natural oxidation of metal electrodes is experimentally studied. The thermal resistance of AlOx tunnel barriers increases linearly with barrier thickness, which is consistent with the prevailing theory of heat conduction in highly disordered materials.…
Single-walled carbon nanotubes (SWNTs) have been chemically attached with high density onto a patterned substrate. To form the SWNT pattern, the substrate was treated with acid-labile group protected amine, and an amine prepattern was formed using a photolithographic process with a novel polymeric photoacid generator…
Imaging thermography in the 3–5μm wavelength range is applied to the analysis of thermal properties of high-power diode lasers. We investigate these devices by inspecting their front facets as well as their active regions along the resonator. The latter is done through top windows within the substrate. Raw data are fo…
Real (epsilon') and imaginary (epsilon") parts of the complex dielectric permittivity (epsilon*) of the liquid crystal (LC) 4-n-decyl-4'-cyanobiphenyl (10CB) embedded in Anopore membranes and Vycor porous glass, as well as dispersed with hydrophilic aerosils, have been studied by means of broadband dielectric spectros…
The syntheses, crystal structures, and magnetic properties of three novel cyano-bridged bimetallic assemblies, [Ni(bpm)(2)](3)[Co(CN)(6)](2)x3.5H(2)O (1), [Co(bpm)(2)][Fe(CN)(5)NO]x2H(2)O (2), and [Co(bpm)(2)][Ni(CN)(4)] (3) (bpm = bis(1-pyrazolyl)methane), are reported. Complex 1 crystallizes in the tetragonal space…
ZnO nanowires with a diameter distribution from 20 to 100 nm were fabricated by a simple thermal evaporation process. Two different types of nanowire (circular versus hexagonal cross section) were obtained by controlling the growth conditions. The size-dependent electronic structures of both types of samples were inve…
We have studied the evolution of anisotropic epitaxial strains in ⟨110⟩-oriented (Ba0.60Sr0.40)TiO3 paraelectric (m3m) thin films grown on orthorhombic (mm2) ⟨100⟩-oriented NdGaO3 by high-resolution x-ray diffractometry. All the six independent components of the three-dimensional strain tensor were measured in films w…
Bulk protein crystallization, unlike small molecule crystallization, has found very limited use in biopharmaceutical manufacture. Most work in this area targets obtaining single large crystals for molecular structure determination by crystallography. Design and optimization of bulk crystallization for protein recovery…
Abstract Mineral scale formation and deposition on downhole and surface equipment is a major source of cost and reduced production to the oil industry. This paper describes a novel semi-quantitative kinetic approach to predicting the location of barium sulfate formation and deposition. The key conclusions of this work…
Abstract In many production fluids encountered in the oil and gas industry, the formation of mineral scales such as BaSO4 and CaCO3 causes major problems with respect to flow assurance. It has recently become apparent that in order to fully understand a scaling system both an appreciation of the bulk precipitation and…
Monte Carlo simulations of the vacancy and phosphorus (P) atom diffusion in body centred cubic (bcc) iron are presented. The input parameters for the calculations, namely the activation energies of atomic jumps, have been obtained using a potential set developed recently for a dilute Fe–P alloy using ab initio data. T…
Abstract Transportation of hydrocarbons and water in long subsea flowlines from satellite fields to a platform or to shore results in new challenges to control hydrates, corrosion and scale. As the fluids cool down, water will condense and gas hydrates will form unless an inhibitor such as mono ethylene glycol (MEG) i…
We study theoretically the lamellar-disorder-lamellar phase transitions of AB diblock and tetrablock copolymers confined in symmetric slitlike pores where the planar surface discriminatingly adsorbs A segments but repels B segments, mimicking the hydrophobic/hydrophilic effects that have been recently utilized for the…
Homogeneous and transparent sodium aluminum fluoride phosphate gels and glasses were prepared by a novel single-step sol−gel route using aqueous solutions of di-sodium fluorophosphate (Na 2 PO 3 F) and aluminum lactate (Al(lact) 3 ) as precursors. The structural evolution from the solution to the gel and the final gla…
The basic physical mechanisms by which different kinds of ionizing radiation interact with matter are described. Understanding of these processes, coupled with detailed knowledge of atomic structure, provides much of the foundation for the theory and practice of radiological health protection today.
Abstract Scale deposition is often controlled using chemical scale inhibitors. However, for high scale severity, sulphate reduction in the injected seawater may provide a more attractive economic solution to the problem. This study uses data based on Marlim Leste (Campos Basin, offshore Brazil) reservoir brine composi…
Wie Zeolithe zeigt auch K6Sn[Zn4Sn4S17] (siehe Struktur) Ionenaustauscheigenschaften und bildet in Gegenwart von Cs+- oder Rb+-Ionen CsK5Sn[Zn4Sn4S17] bzw. RbK5Sn[Zn4Sn4S17]. Die bemerkenswert stabilen offenen Gerüste dieser Verbindungen bestehen aus über Sn4+-Zentren verknüpften [Zn4Sn4S17]10−-Clustern. Ein Fünftel d…