Materials Literature
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Poly(vinylalkohol), ein inhärent amphiphiles Material, kann nach Abscheidung auf einer Aluminiumoxidmembran in Form von Nanofasern (siehe Bild) als superhydrophobe Oberfläche wirken. Die Anordnung der hydrophoben und hydrophilen funktionellen Gruppen sowohl auf der Oberfläche als auch innerhalb des Materials hat einen…
Abstract Depolymerization of poly(ethylene terephthalate) waste (PETW) was carried out by methanolysis using zinc acetate in the presence of lead acetate as the catalyst at 120–140 °C in a closed batch reactor. The particle size ranging from 50 to 512.5 µm and the reaction time 60 to 150 min required for methanolysis…
The magnetization reversal and dynamics of a spin valve pillar, whose lateral size is 64$\times$64 nm$^2$, are studied by using micromagnetic simulation in the presence of spin transfer torque. Spin torques display both characteristics of magnetic damping (or anti-damping) and of an effective magnetic field. For a ste…
The continuum theory of partially fluidized shear granular flows is tested and calibrated using two dimensional soft particle molecular dynamics simulations. The theory is based on the relaxational dynamics of the order parameter that describes the transition between static and flowing regimes of granular material. We…
We present a theoretical analysis and numerical simulations of lateral current density fronts in bistable resonant-tunneling diodes with Z-shaped current-voltage characteristics. The bistability is due to the charge accumulation in the quantum well of the double-barrier structure. We focus on asymmetric structures in…
Low temperature specific heat $C(T)$ and zero-field muon spin resonance ($μ^+$SR) measurements were performed in Gd(hfac)$_3$NITiPr, a quasi one-dimensional molecular magnet with competing nearest neighbor and next-nearest neighbor intrachain exchange interactions. The specific heat data exhibit a $λ$-peak at $T_0$=2.…
In many situations the process of crystallisation from solution is known to occur via metastable crystalline states (polymorphs or solvates). Here we present what we believe to be a novel example of small molecule crystallisation in which the initial separation of a solute rich liquid phase precedes the crystallisatio…
Metal nanorods and nanowires (see Figure) have been synthesized using multiwalled carbon nanotubes (MWCNTs) as templates and supercritical CO 2 as the reaction medium. This rapid, direct, and clean approach can also be used to fabricate other metal/CNT composites and to coat the CNTs with metal films or nanoparticles.
Several alternative possibilities of how to create an electromagnetic device being able to reconstruct near-field distribution of a source with sub-wavelength resolution (so-called perfect lens) are considered. It is shown that there is a variety of such means not involving double-negative (left-handed, or Veselago) m…
We have examined the electrical transport in disordered molecular solids. It has been found that mobility is a function of electric field and temperature due to hopping conduction. Several theoretical models for charge transport in disordered solids have been debated over the role of spatial and energetic correlation…
Two perovskite-derived materials, CaCu3Mn4O12 and CaCu3Ti4O12, have drawn much recent interest due to their magnetoresistive, dielectric, and magnetoelectronic characteristics. Here we present initial theoretical insights into each of these points, based on first principles, density functional based calculations. Our…
Semiconductor nanoribbons of ZnS have been synthesized on a large scale via hydrogen‐assisted thermal evaporation. The product is characterized by means of electron microscopy and energy‐dispersive X‐ray spectroscopy, which show that the as‐prepared ZnS nanoribbons are single crystals with uniform morphology. A stable…
Spontaneous formation of vesicles in both organic solvents and water is observed for new rod–coil-type diblock copolymers containing thiophene groups. The thiophene groups located in the skin of the aggregates can couple to give polymerized vesicles (see picture and cover picture). The vesicles are capable of includin…
Ionic conductors have always provided a fascinating interdisciplinary field of study ever since their discovery by Faraday at the Royal Institution in London over 200 years ago. More recently, and particularly in the past decade, the pace of research has been rapid, driven by the requirements for new clean energy sour…
Poly(vinyl alcohol), an inherently amphiphilic material, can act as a superhydrophobic surface when deposited as nanofibers on an aluminum oxide membrane (see picture). The arrangement of the hydrophobic and hydrophilic functional groups, both in the surface and within the interior of the material, has a marked effect…
Abstract We present a concise, although admittedly non‐exhaustive, but hopefully didactic review and discussion of some of the central and basic concepts related to the energetics of surfaces and interfaces of solids. This is of particular importance for surfaces and interfaces that involve organic molecules and molec…
We describe theoretically novel excitons in self-assembled quantum dots interacting with a two-dimensional electron gas in the wetting layer. In the presence of the Fermi sea, the optical lines become strongly voltage-dependent. If the electron spin is nonzero, the width of optical lines is given by k_BT_K, where T_K…
Strong effects of optical polarization anisotropy observed previously in the quantum wells subjected to the in-plane magnetic field arrive at complete description within microscopic approach. Theory we develop involves two sources of optical polarization. First source is due to correlations between electron and heavy…
We have investigated carbon products deposited on large catalyst islands during carbon nanotube growth by thermal chemical vapor deposition on a Fe–Ni catalyst film, using cross-sectional analysis by transmission electron microscopy and scanning electron microscopy. It was found that carbon atoms covering on the surfa…
The crystal structures of deuterated glycinium phosphite crystals with various deuterium concentrations x (0.00, 0.25, 0.50, 0.75 and 1.00) in the paraelectric phase were determined using the X-ray imaging plate diffractometer. The hydrogen bond distances increase with increasing deuterium concentration x , especially…