Materials Literature
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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…
We have theoretically investigated electromechanical properties of freely suspended carbon nanotubes when a current is injected into the tubes using a scanning tunneling microscope. We show that a shuttle-like electromechanical instability can occur if the bias voltage exceeds a dissipation-dependent threshold value.…
Aluminum-doped zinc oxide (ZnO:Al) films fabricated by chemical bath deposition are characterized using scanning electron microscopy and photoluminescence (PL) spectroscopy. The impact of rapid thermal annealing (RTA) upon the morphology and luminescence characteristics of ZnO:Al layers is studied in an annealing temp…
Metallooctaphyrin complexes: Dimetalation of perfluorinated [36]octaphyrin with copper(II) results in the hydrolytic ring opening of one of the pyrrole rings (see structure), whereas with silver ions perfluorinated [36]octaphyrin and meso-pentafluorophenyl-substituted [36]octaphyrin gave disilver(I) complexes of [34]o…
Chemical sputtering of amorphous hydrogenated carbon layers by nitrogen molecular ions was studied as a function of the ion energy in the range from 30to900eV. The sputtering yield shows only a very weak variation with energy in the range from 900 down to 50eV. For lower energies it decreases significantly. This behav…
We present in this report a new type of particles with micrometer-order sizes, which we called giant graphitic balls (GG balls). The GG balls are produced by CO2 laser ablation of graphite together with single-wall carbon nanohorns. They have graphitic structures whose layers tend to align parallel with the GG-ball su…
<div class="htmlview paragraph">Forthcoming on-highway 2005/2007 European and North American emission regulations will require modern diesel engines to be equipped with Diesel Particulate Filters (DPF) capable of trapping up to 99% of the exhaust particulate matter. Since diesel particulates (soot) accumulate in…
Bioactivity of biomaterials was a new requirement, especially in tissue engineering and drug delivery. As a traditional used biomaterial, polylactide (PLA) had no bioactivity, of course, and it still had few reactive groups to introduce some bioactive molecules in its bulk. Here, we want to introduce carboxyl groups a…
Many solid-state reactions and phase transformations performed under isothermal conditions give rise to asymmetric, sigmoidally shaped conversion-time (x-t) profiles. The mathematical treatment of such curves, as well as their physical interpretation, is often challenging. In this work, the functional form of a Maxwel…
Crystalline 4.6 nm HgTe quantum dots, stabilized by 1-thioglycerol ligands, were synthesized by wet chemical methods. Room-temperature photoluminescence spectra of the dots, both in solution and as solid arrays, exhibited near-infrared emission. Light-emitting devices were fabricated by deposition of quantum dot layer…
We describe the formation and permeability of polyelectrolyte multilayer hollow-shell capsules by photo-cross-linking and controlled-release (fluorescence) studies. The hollow shells were prepared by alternate layer-by-layer (LbL) adsorption of photo-cross-linkable benzophenone modified poly(allylamine hydrochloride)…
The figure of merit for the electron optical performance of carbon-nanotube (CNT) electron sources is presented. This figure is given by the relation between the reduced brightness and the energy spread in the region of stable emission. It is shown experimentally that a CNT electron source exhibits a highly stable emi…
Isotropic nanocomposite magnetic structures were produced via cluster assembly routes with energy products reaching 18 MG Oe. Gas aggregation produces Fe clusters with an average size less than 10 nm with a very narrow size distribution, and these were embedded in a hard magnetic matrix by cosputtering of FePt. Struct…
Further tightened emission legislation and new engine technologies increase the requirements for the exhaust after-treatment system of modern diesel passenger cars. Especially the increasing raw emissions of HC and CO as well as the low temperature of the exhaust gas for a long period during cold start of the New Euro…
The temperature behavior of the secondary relaxation in tri-propylene glycol under isobaric pressure up to $1.7\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ was studied in detail. We show that dynamics of the secondary process is changed during crossing glass temperature ${T}_{g}$, and secondary relaxation time show minimu…
We show that near-surface defects produced by mechanical treatments and electron irradiation can significantly enhance the intensity of luminescence due to the decay of self-trapped excitons (STEs) in single-crystal calcium fluoride during 157- and 193-nm irradiation. For example, polishing can double the intensity of…
Abstract A large independent operator in Mobile Bay, Gulf of Mexico was experiencing a buildup of common and exotic scales where the produced waters are commingled. The scale species encountered included barium sulfate, zinc sulfide, and lead sulfide. Traditionally, scale inhibitor chemistries have not been used in th…
In Part I we reported experimental results obtained from isothermal stress relaxation tests of electroplated Cu thin films with and without a passivation layer and deduced grain-boundary and interface diffusivities based on a kinetic model. Here in Part II we describe the detail of the model, which is based on couplin…
The addition of Ga to bcc α-Fe increases the magnetostriction of Fe in the [100] direction (a factor of 12 for Fe81Ga19). The effect of annealing highly textured polycrystalline Fe81.6Ga18.4 rods under compressive stresses of −100 and −150MPa for 10–100min at temperatures between 625°C and 635°C was examined. After an…