Materials Literature
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The class of the Generalized Coherent Potential Approximations (GCPA) to the Density Functional Theory (DFT) is introduced within the Multiple Scattering Theory formalism for dealing with, ordered or disordered, metallic alloys. All GCPA theories are based on a common ansatz for the kinetic part of the Hohenberg-Kohn…
The effects of inserting impurity $δ$-layers of various elements into a Co/IrMn exchange biased bilayer, at both the interface, and at given points within the IrMn layer a distance from the interface, has been investigated. Depending on the chemical species of dopant, and its position, we found that the exchange biasi…
The alpha-beta magneto-structural phase transition in MnAs/GaAs(111) epilayers is investigated by elastic neutron scattering. The in-plane parameter of MnAs remains almost constant with temperature from 100 K to 420 K, following the thermal evolution of the GaAs substrate. This induces a temperature dependent biaxial…
Abstract The potential use of the liquid product obtained from the pyrolysis of polystyrene as a raw material for the reproduction of the polymer was investigated in this study. Catalytic and non‐catalytic pyrolysis experiments were carried out in a fixed bed reactor using either model polymer or commercial waste prod…
We report a chemical vapor deposition (CVD) synthesis of hyperbranched single-crystal nanowires of both PbS and PbSe using PbCl2 and S/Se as precursors under hydrogen flow. Multiple generations of nanowires grow perpendicularly from the previous generation of nanowires in an epitaxial fashion to produce dense clusters…
A dual-excitation method for resonant-frequency tracking in scanning probe microscopy based on amplitude detection is developed. This method allows the cantilever to be operated at or near resonance for techniques where standard phase locked loops are not possible. This includes techniques with non-acoustic driving wh…
A novel Stochastic Event-Driven Molecular Dynamics (SEDMD) algorithm is developed for the simulation of polymer chains suspended in a solvent. The polymers are represented as chains of hard spheres tethered by square wells and interact with the solvent particles with hard core potentials. The algorithm uses Event-Driv…
Aggregation löscht Fluoreszenz: Mit 11-Mercaptoundecansäure (11-MUA) geschützte Goldnanopartikel (11-MUA-AuNPs) sind deutlich beständiger und fluoreszieren viel stärker als die nichtmodifizierten AuNPs. Nach der Zugabe von 2,6-Pyridindicarbonsäure binden die 11-MUA-AuNPs hoch empfindlich und selektiv an HgII-Ionen, di…
One failure mechanism of thermal barrier coatings composed of yttria‐stabilized zirconia (YSZ) has been proposed to be caused, in part, by the transformation of the tetragonal phase of YSZ into its monoclinic phase. Normally, studies of phase evolution are performed by X‐ray diffraction (XRD) and by evaluating the int…
Biomimetic superhydrophobic surfaces successfully fabricated on high-density polyethylene surfaces by simple heat- and pressure-driven imprinting methods using patterned anodic aluminum oxides as replication templates are reported. On measuring the water contact angle (see figure), it is clearly observed that the nano…
Gold threads modified with superhydrophobic or normal hydrophobic coatings are used as a model system in the study of the contribution of the superhydrophobic coating of a water strider to its floating and movement on the water surface. After depositing Pt aggregates on one of its ends (see figure), the gold threads a…
Abstract Films of high Young's modulus and low density are of interest for application as loudspeaker membranes. In the present study nanocomposite films were prepared from microfibrillated cellulose (MFC) and from MFC in combination with melamine formaldehyde (MF). The prepared materials were studied with respect to…
Abstract Robust ultrathin multilayer films of silk fibroin were fabricated by spin coating and spin‐assisted layer‐by‐layer assembly and their mechanical properties were studied both in tensile and compression modes for the first time. The ultrathin films were characterized by a high elastic modulus of 6–8 GPa (after…
We present a simple strategy for the fabrication of porous carbon nanofibers (see figure). This procedure produces thin webs by electrospinning a polymer solution containing different concentrations of zinc chloride and subsequently thermally treating the system. Their resulting surface area and good electrical conduc…
Quenching upon aggregation: 11-Mercaptoundecanoic acid (11-MUA)-protected Au nanoparticles (11-MUA-AuNPs) are much more stable and fluoresce much more strongly than the corresponding unmodified AuNPs. After addition of 2,6-pyridinedicarboxylic acid, the 11-MUA-AuNPs bind to HgII with both high sensitivity and selectiv…
The antifogging properties of mosquito compound eyes (see figure) result from their elaborate superhydrophobic surface structure, which consists of hexagonally non-close-packed nipples at the nanoscale and hexagonally close-packed hemispheres at the microscale. A soft-lithography approach is adopted to fabricate artif…
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
Extract Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
Air-core superconducting transformers incorporate the function of shunt reactors, thus they can be used in high-voltage high-capacity applications. They result lighter than their traditional counterpart while requiring heavy metallic shields. However they may represent an effective alternative to traditional transform…
PDF | An investigation into the influence of low copper contents on the hot ductility of C-Mn-Al steels has been carried out in order better the understanding on the problem of “hot shortness”. Previous work has suggested that this problem results from the segregation of Cu that occurs at the surface of the steel as a…