Materials Literature
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In face-centered-cubic (fcc) Al, stacking fault energy (SFE) is high at ca. $150\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}∕{\mathrm{m}}^{2}$, inhibiting stacking fault (SF) formation and dislocation motion. Yet Ag-rich hcp precipitates form rapidly in Al-rich fcc Al-Ag, even as the energy difference $\ensuremath{\Delta}{E…
The carbon concentration in catalytic metal particles during the initial stages of single-walled carbon nanotube (SWNT) nucleation is studied by thermodynamics modelling and molecular dynamics simulation. Highly supersaturated carbon concentrations are necessary for nucleating the initial small carbon structures (e.g.…
Goldene Gürtel: Einkristalline Gold-Nanogürtel (siehe REM-Bild) wurden durch Ultraschallbehandlung einer wässrigen Lösung von HAuCl4 in Gegenwart von α-D-Glucose als dirigierendem Reagens synthetisiert. Die Nanogürtel sind typischerweise 30 bis 50 nm breit und mehrere Mikrometer lang. Die Methode ist einfach, schnell…
Using time-resolved small angle neutron scattering, we have measured the wave-number-dependent structure factor S(q) of monodisperse nanoemulsions that aggregate and gel after we suddenly turn on a strong, short-range, slippery attraction between the droplets. At high q, peaks in S(q) appear as dense clusters of dropl…
The nature of the proteins which comprise the in vitro excretory/secretory products (ES) of the fourth-stage larva (L4) and adult Teladorsagia circumcincta are largely undefined, despite the fact that this nematode induces profound changes, in part related to parasite ES, in the cellular architecture of the glands lin…
Carbon nanotubes (CNTs) coated with MoS 2 were produced by hydrothermal reaction using Na 2 MoO 4 as the Mo source and CS(NH 2 ) 2 as the reducing agent and S source, with CNTs present. The product was characterized by high resolution transmission electron microscopy, energy-dispersive spectroscopy, Raman and x-ray di…
The effect of different conditions on the susceptibility of nitinol to localized corrosion was examined using the cyclic potentiodynamic polarization technique. Tests were performed on mechanically polished (MP) and electropolished (EP) nitinol wire in 0.9 wt % NaCl and phosphate-buffered saline (PBS). A polarization…
A series of Pd and Pt chloride complexes with pyridine (py), 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen), of general formulae trans-/cis-[M(py)2Cl2], [M(py)4]Cl2, trans-/cis-[M(py)2Cl4], [M(bpy)Cl2], [M(bpy)Cl4], [M(phen)Cl2], [M(phen)Cl4], where M = Pd, Pt, was studied by 1H, 195Pt, and 15N NMR. The 90-140 p…
Es bleibt in der Familie: Eine Eintopfkondensation mit einem Borsäuretemplat ermöglicht die Synthese von Subporphinbor(III)-Komplexen (siehe Beispiel; B grün, O rot, N blau, C türkis, H weiß), ringverengten Artverwandten der Porphyrine. Der einfache Austausch axialer Liganden liefert alkoxy- und carboxykoordinierte Su…
A simple and low-cost soft route has been developed to the direct large-scale production of highly oriented ZnO nanowire arrays at 60 °C. It has been found that the growth of well-aligned ZnO nanowire arrays is dependent on several parameters, such as the reaction time and the concentration of ammonium ions. The envir…
Dynamic covalent iminofluorene-based oligomers and polymers have been generated. They undergo constitutional recomposition under the effect of two parameters, acidity and ZnII metal ions. As a result, marked changes in physical properties take place. The results illustrate the response of such a dynamic system to chem…
We present a first-principles computational study of the nature and origin of ferromagnetism in Co-doped $\mathrm{Ti}{\mathrm{O}}_{2}$. We calculate the magnetic ordering and electronic properties as a function of the concentration and distribution of Co dopants and oxygen vacancies. We find that Co atoms prefer to su…
We present a novel approach to the in situ deposition of size-controlled platinum nanoparticles on the exterior walls of carbon nanotubes (CNTs). The reduction of metal ions in ethylene glycol (EG), by the addition of a salt such as sodium dodecyl sulfate (SDS), p-CH3C6H4SO3Na, LiCF3SO3, or LiClO4, results in high dis…
Silver nanowire arrays with high aspect ratios have been prepared using potentiostatic electrodeposition within the confined nanochannels of a commercial porous anodic aluminium oxide template. The nucleation and growth processes are intensively studied by current versus time transients. Scanning electron microscopy r…
The purpose of this study is to elucidate the interaction between the cell and the surface of poly(L-lactide) (PLLA) samples, which were modified using a low-temperature plasma treatment apparatus at atmospheric pressure. The plasma treatments were carried out in the atmospheres of air, carbon dioxide (CO2), and perfl…
We investigate the phenomenon of multilayer formation via layer-by-layer deposition of alternating charge polyelectrolytes. Using mean-field theory, we find that a strong short-range attraction between the two types of polymer chains is essential for the formation of multilayers. The dependence of the required short-r…
Circular or columnar orientations of mesoporous silica can be selectively prepared by tuning the silica-to-surfactant ratio and the humidity during the synthesis of the mesoporous material within the regular larger channels of anodic alumina membranes. The transmission electron microscopy image shows the circular orie…
OBJECTIVE: Assess effects of body mass index (BMI) on trial of labor after previous cesarean delivery and determine whether morbidly obese women have greater maternal and perinatal morbidity with trial of labor compared with elective repeat cesarean delivery. METHODS: Secondary analysis from a prospective observationa…
Recent experiments involving CdTe films grown on Si(111) substrates by hot wall epitaxy revealed features not previously observed [S. O. Ferreira \textit{et al.}, J. Appl. Phys. \textbf{93}, 1195 (2003)]. This system, which follows the Volmer-Weber growth mode with nucleation of isolated 3D islands for less than one m…
We have used in-field neutron and x-ray single-crystal diffraction to measure the incommensurability $\ensuremath{\delta}$ of the crystal and magnetic structures of multiferroic ${\mathrm{TbMnO}}_{3}$. We show that the flop in the electric polarization at the critical field ${H}_{C}$, for field $H$ along the $a$ and $…