Materials Literature
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Schlanker mit Erfolg! Im Kolloidzustand stabile ultradünne Bi2S3-Nanodrähte (siehe Bild) mit ausgeprägten exzitonischen Eigenschaften, wie sie in Bismutchalkogeniden noch nie beobachtet wurden, und extrem hohen Extinktionskoeffizienten wurden in Gramm-Mengen synthetisiert. Nanostrukturen wie diese haben ein großes Pot…
We investigate the assembly of block copolymer-nanoparticle composite films on chemically nanopatterned substrates and present fully three-dimensional simulations of a coarse grain model for these hybrid systems. The location and distribution of nanoparticles within the ordered block copolymer domains depends on the t…
Quasi-two-dimensional transport is investigated in a system consisting of one ferromagnetic layer placed between two insulating layers. Using the mechanism of skew-scattering to describe the Extraordinary Hall Effect (EHE) and calculating the conductivity tensor, we compare the quasi- two-dimensional Hall resistance w…
Within the idealized scheme of a 1-dimensional Frenkel-Kontorova-like model, a special "quantized" sliding state was found for a solid lubricant confined between two periodic layers [PRL 97, 056101 (2006)]. This state, characterized by a nontrivial geometrically fixed ratio of the mean lubricant drift velocity and the…
Alpha-Ni(OH)(2) nanobelts, nanowires, short nanowires, and beta-Ni(OH)(2) nanoplates have been successfully prepared in high yields and purities by a convenient hydrothermal method under mild conditions from very simple systems composed only of NaOH, NiSO(4), and water. It has been found that the ratio of NaOH to NiSO…
Think thin! Colloidally stable ultrathin Bi2S3 nanowires (see picture), which display strong excitonic features never before seen in bismuth chalcogenides and extremely high extinction coefficients, have been synthesized on a gram-scale. Nanostructures such as this are of very high technological potential for thermoel…
Earlier tests show that the Tao-Perdew-Staroverov-Scuseria (TPSS) nonempirical meta-generalized gradient approximation (meta-GGA) for the exchange-correlation energy yields more accurate surface energies than the local spin density (LSD) approximation for spin-unpolarized jellium. In this study, work functions and sur…
The role of 3He-3He collisions in our diffusion experiment is addressed and shown to not be relevant to the measurement of 3He diffusion against phonons in superfluid helium.
In this paper the new concept of super-bridges, i.e. kilometre-long bridges suspended over carbon nanotube cables, is introduced. The analysis shows that the use of realistic (thus defective) carbon nanotube bundles as suspension cables can enlarge the current limit main span by a factor of 3.
We apply the model introduced in Phys. Rev. B 75, 064202 (2007), cond-mat/0610469, to calculate the anisotropy effect in the interaction of two level systems with phonons in disordered crystals. We particularize our calculations to cubic crystals and compare them with the available experimental data to extract the par…
In this work, electrically conductive polyaniline (PAni) doped with camphorsulfonic acid (CPSA) is blended with poly(L-lactide-co-epsilon-caprolactone) (PLCL), and then electrospun to prepare uniform nanofibers. The CPSA-PAni/PLCL nanofibers show a smooth fiber structure without coarse lumps or beads and consistent fi…
We report on a self-sorting supramolecular fiber formation of photo- and electro-active molecules (p-type oligothiophene and n-type perylene derivatives) toward the development of a photoelectronic conversion system operated by visible light irradiation.
Logical devices based on spin waves offer the potential to avoid dissipation mechanisms that limit devices based on either the charge or spin of mobile electrons. Multiferroic magnetoelectrics, which are materials that combine ferroelectric and magnetic order, allow direct switching of magnetic order and thence of spi…
Abstract This review reports on recent advances in the design of biodegradable polymers built from petroleum and renewable resources using reactive extrusion processing. Reactive extrusion represents a unique tool to manufacture biodegradable polymers upon different types of reactive modification in a cost‐effective w…
One-dimensional structures of nitrogen-rich carbon nitride are synthesized via a thermal evaporation process. The CN atomic rings (s-triazine and/or tri-s-triazine) present in the precursor remain stable during the thermal evaporation and vapor transfer. They act as basic building blocks during the microstructure ass…
The migration of individual Au and Pt atoms in graphene layers (see image) is observed by high-resolution TEM. In situ experiments at 600–700 °C show that two-dimensional diffusion within the plane of the layer and the one-dimensional diffusion along the open edges occurs with activation energies of 2.3–2.5 eV. It is…
We describe the structural, optical, and electrical properties of films of spin-cast, oleate-capped PbSe nanocrystals that are treated thermally or chemically in solutions of hydrazine, methylamine, or pyridine to produce electronically coupled nanocrystal solids. Postdeposition heat treatments trigger nanocrystal sin…
A new method for creating layer-by-layer (LbL) assembled films on any substrate using polymers inspired by the high catechol content of mussel adhesive proteinsis presented. Catechol-derivatized polymers permit LbL assembly on challenging substrates without prior surface preparation. Catechol groups incorporated into…
Manufacturers of clothing articles employ nanosilver (n-Ag) as an antimicrobial agent, but the environmental impacts of n-Ag release from commercial products are unknown. The quantity and form of the nanomaterials released from consumer products should be determined to assess the environmental risks of nanotechnology.…
A newly developed experimental system for measurements of electron emission induced by low energy ions at below low ion flux (10 5 ions s −1 cm −2 ) avoiding the fast emission degradation caused by high ion fluxes (usually applied 10 10 –10 13 ions s −1 cm −2 ) has been established. The method, based on an event-by-ev…