Materials Literature
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Nachgeahmt: Ein supramolekulares Hydrogel als Strukturkomponente künstlicher Enzyme eröffnet einen Zugang zu biomimetischen Katalysatoren. In Toluol erreicht Häminchlorid, das in ein solches Hydrogel eingeschlossen ist, etwa 60 % der katalytischen Anfangsaktivität von Meerrettichperoxidase. Zudem ist seine Aktivität i…
Despite the industrial importance of the process, the detailed chemistry of the high-temperature oxidation of titanium tetrachloride (TiCl4) to produce titania (TiO2) nanoparticles remains unknown, partly due to a lack of thermochemical data. This work presents the thermochemistry of many of the intermediates in the e…
Abstract 1‐Carboxy‐ N , N ‐dimethyl‐ N ‐(2′‐methacryloyloxyethyl)methanaminium inner salt (CMB) was polymerized by ATRP initiated with a disulfide difunctionalized by 2‐bromoisobutyryl groups. The disulfide‐carrying carboxybetaine polymer (DT‐PCMB) was used for the preparation of PCMB‐protected gold nanoparticles (PCM…
Extracellular matrixes such as bone, skin, cornea, and tendon have ordered structures comprised for the most part of collagen, an elongated protein of well-defined dimensions and composition. Here we show how the cooperative ordering of collagen triple helices in the dense fluid state is exploited to produce dense ord…
Insulated wires: Light harvesting was demonstrated from a macrocyclic “tube” to covalently bound π-conjugated polymers encapsulated within (see picture). The multichromophoric polymer core allows accumulation of excitation energy. The high intramolecular mobility of these excitations leads to a dependence of the emiss…
Thin films were produced by the reactive thermal evaporation of pure silver oxide (AgO) in a background of molecular oxygen. The effects of the deposition rate and oxygen partial pressure on the structural, chemical, electrical and optical properties of the films were investigated. The films were characterized using x…
Pi-conjugated polymers and oligomers show charge transfer (CT) absorption bands when mixed with electron acceptors in chloroform solution. This is attributed to the formation of (ground state) donor-acceptor complexes in solution. By varying the concentration of the donor and acceptor, the extinction coefficient for t…
Bringt Farbe rein: Selbstorganisation eines amphiphilen, stark verzweigten Poly(amidoamins) auf einem festen Substrat liefert Filme mit Honigwabenmuster. Über die Konzentration der Polymerlösung lässt sich die Filmdicke im Bereich von Nano- bis Mikrometern einstellen. In unterschiedlichen Farben lumineszierende Filme…
La-substituted BiFeO3 (BFO) thin films were formed by depositing sol?gel solutions on Pt/Ti/SiO2/Si (1?0?0) structures. No secondary phase was observed by La-atom-substitution up to 20% in BFO thin films. The micro-structures of the films were changed with an increase in La concentration, which influenced the ferroele…
A film to dye for: Honeycomb-patterned films have been fabricated by the self-assembly of amphiphilic hyperbranched poly(amidoamine) on solid substrates. The film thickness can be varied from the nanometer to micrometer scale simply by changing the concentration of the polymer solution. Luminescent films of different…
The polarized photoluminescence excitation spectra of twenty-five single-walled carbon nanotube species are reported. For light polarized along the nanotube axis, the main absorption resonance at E22 shows sidebands attributed to phonon assisted absorption. Sidebands to E11 have a diameter dependent energy and are ass…
We report the discovery of superconductivity below 1.65(6) K in Sr-intercalated graphite SrC6, by susceptibility and specific heat (Cp) measurements. In comparison with CaC6, we found that the anisotropy of the upper critical fields for SrC6 is much reduced. The Cp anomaly at Tc is smaller than the BCS prediction indi…
The electronic structure of the quasi-lowdimensional vanadium sulfide \bavs3 is investigated for the different phases above the magnetic ordering temperature. By means of density functional theory and its combination with dynamical-mean field theory, we follow the evolution of the relevant low-energy electronic states…
We investigate the dimerization and fusion of C60 molecules to form various C60 dimers when pushed against each other at several inter-molecular distances. We study the stability of this dimerized C60 molecule based on its binding strength provided by intramolecular interactions. Tersoff potential, which is considered…
Remarkably big increase of the substrate temperature during the low-temperature MBE growth of GaMnAs layers is observed by means of band gap spectroscopy. It is explained and simulated in terms of changes in the absorption/emission characteristics of the growing layer. Options for the temperature variation damping are…
Ferromagnetic Resonance Force Microscopy (FMRFM) offers a means of performing local ferromagnetic resonance. We have studied the evolution of the FMRFM force spectra in a continuous 50 nm thick permalloy film as a function of probe-film distance and performed numerical simulations of the intensity of the FMRFM probe-f…
Room temperature ferromagnetism is observed in undoped TiO2 films deposited on Si substrates using pulsed laser deposition (PLD). The ferromagnetic properties of the samples depend on the oxygen partial pressure during the PLD synthesis. The appearance of higher binding energy component (HBEC) in the oxygen 1s core pe…
Topological changes of the Fermi surface under pressure may cause anomalies in the low-temperature elastic properties. Our density functional calculations for elemental Osmium evidence that this metal undergoes three such Lifshitz transitions in the pressure range between 70 GPa and 130 GPa. The related elastic anomal…
Nanoimprint lithography and physical vapor deposition were combined to fabricate large-area homogeneously patterned SERS-active substrates with tunable surface plasmon resonances. The plasmon shift observed was connected to the surface nanotopography since (a) the SERS-active nanoparticles on all the substrates invest…
A reduction of polarization in ultra-thin ferroelectric films appears to be fundamental to ferroelectricity at the nanoscale. For the model system PbTiO3 on SrTiO3, we report observation of the polarization vs. thickness relation. Distinct periodicity changes of ferroelectric domains obtained from x-ray diffraction an…