Materials Literature
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A novel spin-polarization mechanism involving the intramolecular ion pair *A.−-D.+-R, which competes with a spin–orbit intersystem crossing, is proposed for the formation of the uniquely spin-polarized quartet photoexcited state observed for 1, which consists of a bodipy acceptor (A), a phenylanthracene donor (D), and…
UV-Licht bewirkt die reversible Bildung und Rückbildung von helicalen Nanofasern durch Photodimerisierung bzw. Photodissoziation des Thyminrestes in dem 1,ω-Thymidylsäure-Bolaamphiphil 1. Durch 1H-NMR-Spektroskopie wurde nachgewiesen, dass die UV-Bestrahlung von selbstorganisierten Nanofasern von 1 durch die Bildung e…
Abstract Natural fiber‐thermoplastic composite materials, based on their cost‐effectiveness and environmental friendliness, have attracted much interest both scientifically and technologically in recent years. Other advantages of natural fibers are good specific strength, less abrasion, and less irritation upon inhala…
Abstract Wood particles were modified in a reactive extrusion process with maleated polyethylene (MAPE) and maleated polypropylene (MAPP) compounds. Contents of MAPE were varied to study the effect of material composition on grafting efficiency during reactive extrusion, while extruder barrel temperatures and rotation…
In this paper we report the self-assembling nature of fluorescent hexaazatriphenylenes (HATs) 6a-d with six alkyl/alkoxy-chain-containing biphenyl groups and their application to light-harvesting antennae. In a nonpolar solvent and the film state, the HAT derivatives form one-dimensional aggregates with an H-type para…
Alles Essig: Die selektive Oxidation von Ethanol zu Essigsäure gelingt in wässriger Lösung mit dem Oxidans Luft an einem Gold-Heterogenkatalysator (siehe Bild). Bei 423 K und einem O2-Druck von 0.6 MPa verläuft diese Reaktion glatt in saurer wässriger Lösung in Ausbeuten um 90 %. CO2 ist das einzige Nebenprodukt, das…
Abstract Nanospheres were produced by molecular assembly between tannin and gelatin because of the synergistic interaction of the hydrophobic effect and hydrogen bonding. The factors that influenced the production of nanospheres, such as sample concentration, mass ratio between tannin and gelatin, reaction temperature…
Two sets of reaction kinetics based upon the experimental data independently obtained for NH 3 -SCR and urea decomposition reactions over CuZSM5 catalyst have been deduced to design the urea-SCR process for application to heavy-duty diesel engines. They were finally employed simultaneously to simulate the commercial p…
We investigate the nanostructure and the linear rheological properties of polybutylacrylate (PBA) filled with Stöber silica particles grafted with PBA chains. The silica volume fractions range from 1.8 to 4.7%. The nanostructure of these suspensions is investigated by small-angle neutron scattering (SANS), and we dete…
Eine hohe Anisotropiebarriere von 25 K, sehr langsame Nullfeldrelaxation und ein großes Koerzitivfeld von 15 kOe – typische Eigenschaften eines Einzelmolekülmagneten – zeichnen einen neunkernigen DyIIICuII-Schiff-Base-Komplex aus. Das Bild zeigt den DyCuO-Clusterkern (dunkelgrün Dy, hellgrün Cu, rot O) und Magnetisier…
Light twisting and untwisting: UV light was found to drive reversible helical-nanofiber formation based on the photodimerization and photodissociation of the thymine residue in the 1,ω-thymidylic acid appended bolaamphiphile. 1H NMR spectroscopy revealed that UV irradiation of the self-assembled nanofibers induces a h…
A Ag/SiO2 multilayer imaging structure is shown to have subwavelength performance. Loss is the major limitation, and selection of low-loss materials and suitable operating wavelengths has a significant impact on performance. The influence of the variables is presented, and vortices are shown to exist.
The orb web is a spectacular evolutionary innovation that enables spiders to catch flying prey. This elegant, geometric structure is woven with silk fibers that are renowned for their superior mechanical properties. We used silk gland expression libraries to address a long-standing controversy concerning the evolution…
Kinetic analysis on the nanocrystal solid-solution formation was performed by heat treating CdSe/ZnSe core/shell nanocrystals, synthesized via a typical TOP/TOPO approach, at different temperatures for different time periods. X-ray diffraction (XRD) peak shifts in Cd1-xZnxSe cores according to the solid-solution treat…
Abstract In this article, we propose a model of phase separation in a binary mixture confined to a bounded region which may be contained within porous walls. The boundary conditions are derived from a mass conservation law and variational methods. Employing classical methods, that is, fixed point theorems and standard…
A facile direct synthesis has been developed to prepare colloidal Mn 3 O 4 nanoparticles with diameters of about 5−10 nm at normal temperature and pressure by an ultrasonic-assisted method in the absence of any additional nucleation and surfactant. High-resolution transmission electron microscopy observations revealed…
The orb web is a spectacular evolutionary innovation that enables spiders to catch flying prey. This elegant, geometric structure is woven with silk fibers that are renowned for their superior mechanical properties. We used silk gland expression libraries to address a long-standing controversy concerning the evolution…
Chloroperoxidase (CPO) is a heme-thiolate enzyme that catalyzes hydrogen peroxide-dependent halogenation reactions. Structural data on substrate binding have not been available so far. CPO was therefore crystallized in the presence of iodide or bromide. One halide binding site was identified at the surface near a narr…
Metal photocathodes are commonly used in high-field rf guns because they are robust, straightforward to implement, and tolerate relatively poor vacuum compared to semiconductor cathodes. However, these cathodes have low quantum efficiency (QE) even at UV wavelengths, and still require some form of cleaning after insta…
Hooking up: Self-assembly of a porphyrin amidine and fulleropyrrolidine carboxylic acid based on a two-point amidinium–carboxylate motif leads to supramolecular dyads of high stability (Ka≈107 M−1 in toluene/acetonitrile (9:1)). The synergy of the hydrogen bonds and electrostatic interactions has been shown to be part…