Materials Literature
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We studied the decay of self-trapped excitons (STE's) in ${\mathrm{BaF}}_{2},$ ${\mathrm{SrF}}_{2},$ and ${\mathrm{CaF}}_{2}$ excited at room temperature by two-photon absorption of femtosecond laser pulses by recording time-resolved triplet-luminescence spectra. For ${\mathrm{BaF}}_{2}$ we detected significant spectr…
Abstract Calcium carbonate is a commonly occurring oilfield scale which proves to be difficult to manage. Carbonate scale prediction can be improved by considering the kinetic chemistry in addition to the conventional thermodynamics based predictive techniques. To improve the performance of a predictive model, a thoro…
Abstract Precipitation of mineral scales causes many problems in oil and gas production operations: formation damage, production losses, increased workovers in both producers and injectors, poor injection water quality, and equipment failures due to under-deposit corrosion. The most common mineral scales are sulfate a…
The metallic state in conjugated polymers and single-walled carbon nanotubes is studied by dielectric spectroscopy (8--600 GHz). We have found an intriguing correlation between scattering time $(\ensuremath{\tau})$ and plasma frequency $({\ensuremath{\omega}}_{p}):\ensuremath{\tau}\ensuremath{\propto}{\ensuremath{\ome…
In the title compound, [Eu(NO3)3(H2O)4]·2H2O, the Eu atom is ten-coordinated by three bidentate nitrates and four water molecules. Furthermore, two water molecules are included in the crystal structure forming a complicated network of hydrogen bonds. [Eu(NO3)3(H2O)4]·2H2O is isostructural with other lanthanide analo…
Abstract Poly(vinyl alcohol) (PVA) is a water‐soluble and biomedical polymer. 2‐Acrylamido‐2‐methyl‐1‐propanesulfonic acid was grafted onto PVA using ammonium persulfate as radical initiator. The influences of synthesis conditions such as temperature, concentrations of initiator, PVA and monomer were investigated. Bot…
Abstract The Veslefrikk field is located in block 30/3 of the Norwegian sector of the North Sea. The field has now been on production for approximately ten years, and can be described as being in the decline phase. The Brent and IDS zones contain different fluid systems, and are produced through several commingled wel…
The structural properties of single crystals of R 0.5 Sr 1.5 MnO 4 (R = La, Pr, and Nd) grown by the floating zone method have been studied using the neutron diffraction technique. In particular, the structure and its correlation with the magnetic properties have been investigated for Nd 0.5 Sr 1.5 MnO 4 by using both…
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Abstract A laboratory study of CaCO3 scaling kinetics has been undertaken to obtain information useful for prediction of CaCO3 scale formation. Thermodynamic carbonate scale prediction models have only a limited use since the rate of CaCO3 precipitation can be very slow at lower temperatures (< 60°C). The induc…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTEmbedding of Noble Metal Nanoclusters into Polymers as a Potential Probe of the Surface Glass TransitionV. Zaporojtchenko, T. Strunskus, J. Erichsen, and F. FaupelView Author Information Lehrstuhl für Materialverbunde, Technische Fakult…
Abstract One of the flow assurance challenges facing the deepwater oil and gas field development and production is mineral scale control. In a deepwater production system, barium sulfate scale deposition may arise from two causes, namely: a) commingling of injected seawater with connate formation water, and b) tempera…
Starting from commercially available Ni(II)octaethylporphyrin (OEP), an efficient approach for the preparation of a series of fluorinated and nonfluorinated benzochlorins with variable lipophicity has been developed. Their spectroscopic properties, preliminary in vitro photosensitizing efficacy, and tumor selectivity…
Abstract One of the major concerns within the oil industry is how to deal with scale formation, whether it is in the wellhead equipment, downhole pipelines or the actual field formation. This is because as the scale forms, it begins to deposit itself on the linings of the pipelines, within the equipment and the pores…
Abstract The effect of solvents on radiation‐induced grafting of styrene onto commercial fluorinated polymer films such as poly(tetrafluoroethylene) (PTFE), poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) (FEP) and poly(tetrafluoroethylene‐ co ‐perfluorovinyl ether) (PFA) was investigated by a simultaneous irradiat…
To design near-infrared (NIR) absorbing polyaromatic dyes, we have theoretically elucidated the electronic transition properties of the extended π-conjugation derivatives of 3,4,9,10-perylenetetracarboxylic dianhydride diimide (PTCAI). Framework extension along the molecular long axis, that is, to terrylene (TTCAI) an…
Memory of chirality in triplet 1,7-diradicals was detected for the first time and to a remarkably high degree in the decarboxylative photocyclization of the proline derivative of N-phthaloyl anthranilic acid 1 into 2 (X=H: 45 % yield, 86 % ee; X=Cl: 50 % yield, 79 % ee).
Involatile OsO4! A tetrasubstituted olefin is immobilized on SiO2 and reacts with OsO4 to form a stable osmate(IV) ester (see scheme), which is a leak-proof heterogeneous catalyst for the cis-dihydroxylation of olefins.
Passivation of the metal surface by dendrons bearing a focal 4-pyridone functionality (the second-generation dendron is shown; C: gray, N: blue, O: red) allows controlled nucleation and growth of gold nanoclusters. The particle size is a direct function of the generation number of the dendritic ligands, with higher ge…
From the acid-catalyzed condensation of aryl aldehyde and pyrrole a new type of fused expanded porphyrins, N-fused pentaphyrins NFP5-Y (24 π, yellow) and NFP5-R (22 π, red) were obtained in total yields of 2–19 %. The two normal-type porphyrins are quantitatively interchanged through a redox reaction (see scheme). DDQ…