Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract A pentadentate phenol‐containing ligand (H 3 L) with N 2 O 3 donor atoms yields Ni II 2 ( 1 ), Ni II 4 ( 2 ), Cu II 2 ( 3 ) and Cu II 4 ( 4 ) complexes, which have been structurally characterized by X‐ray diffraction. Complex 1 contains a single‐atom O ‐bridged urea. The compounds were characterized by IR, UV…
Mimicking the texture and anisotropy of the template, birefringent conducting polymer films (see picture) have been obtained by electropolymerization of 3,4-ethyldioxythiophene (EDOT) within a hexagonal lyotropic liquid crystal. Using a self-assembled template to control molecular orientation in conducting polymers co…
Not π stacking but CH⋅⋅⋅π-ring center interactions lead to the fluorescence emission observed for the first time from a heteromolecular excimer complex. In single crystals a toluene molecule is located perpendicular to a Ph2P(S)-disubstituted anthracene chromophore. This toluene complex fluoresces (see picture) but t…
Because of their potential to reduce the environmental impact and geopolitical consequences of the use of fossil fuels, fuel cells have emerged as tantalizing alternatives to combustion engines. Like a combustion engine, a fuel cell uses some sort of chemical fuel as its energy source but, like a battery, the chemical…
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…