Materials Literature
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A tetra(thiafulvalene-crown-ether) phthalocyanine self-assembles into helical tapes nanometers wide and micrometers long. Formation of these scrolled molecular architectures is a first for phthalocyanine fibres and shows potential as a novel conducting material.
Abstract Computer simulations of atomic scale processes in solids are often associated with the issue of spurious reflection of elastic waves at the boundaries of a molecular dynamics domain. In this paper, we propose an approach to emulate non‐reflecting boundary conditions in atomistic simulations of crystalline sol…
The spinning of spider silk requires a combination of aqueous environment and stretching, and the aim of this work was to explore the role of stretching silk fibers in an aqueous environment and its effect on the tensile properties of spider silk. In particular, the sensitivity of the spider silk tensile behaviour to…
We describe a novel tunable approach for the synthesis of carbon nanotube-silica nanobead composites. The control of nanotube morphology and bead size coupled with the versatility of silica chemistry makes these structures an excellent platform for the development of biosensors, or for optical, magnetic and catalytic…
After the atmospheric pressure plasma treatment of polypropylene (PP) film surface, we measured the contact angle of the surface by using polar solvent (water) and nonpolar solvent (diiodomethane). We also calculated the surface free energy of PP film by using the measured values of contact angles. And then we analyze…
Rote Emission mit λem=614 nm zeigt der Europium(III)-Komplex [Eu(tta)3dpbt] (1), wenn er durch Zweiphotonenanregung sensibilisiert wird. Der große Zweiphotonenabsorptionsquerschnitt und die hohe Lumineszenzeffizienz führen zu einem wirksamen Anregungsprozess.
Red emission (λem=614 nm) from EuIII, sensitized by two-photon absorption, has been demonstrated for the europium(III) complex [Eu(tta)3dpbt] (1). A large two-photon-absorption cross section and a high luminescence efficiency of the europium complex ensure a high efficiency of two-photon sensitization.
Through the reduction of micrometer-sized silver phosphate crystals with a perfect rhombododecahedral shape by a reaction/diffusion process to hierarchical, rhombododecahedral silver cages (see picture): The controlled self-assembly of silver particles around the precursor crystal surfaces leads to the formation of mo…
The Early Eocene Fur Formation is a clayey diatomite interbedded with layers of volcanic ash. The diatomite is non-calcareous, laminated or structureless, and thin sections show that the proportion of clay-sized particles to diatom frustules varies between laminae. The clay mineral phase has been isolated and its chem…
Optical spectra are calculated in semiconducting carbon nanotubes in the presence of magnetic flux and strain within a k · p scheme. The exciton absorption energies show an extra logarithmic dependence on the diameter after being scaled by the inverse diameter, coming from that of the enhancement of the band gaps. The…
The effect of Al-substitution on the physical, IR spectra and magnetic properties of Mn Ni Zn Al Fe O (x=0 to x=0.15, with step= 0.025) ferrites, prepared by conventional ceramic method, 0.5 0.1 0.4 x 2-x 4 has been studied. The analysis of IR spectrum indicated the distribution of Al-ions between both A and B-sites.…
Phosphorus ions were implanted in ZnO single crystals with energies of 50–380keV having total doses of 4.2×1013–4.2×1015cm−2. Positron annihilation measurements reveal the introduction of vacancy clusters after implantation. These vacancy clusters grow to a larger size after annealing at a temperature of 600°C. Upon f…
The crystallization of well-defined poly( l -lactide)- b -poly(ε-caprolactone) diblock copolymers, PLLA- b -PCL, was investigated by time-resolved X-ray techniques, polarized optical microscopy (POM), and differential scanning calorimetry (DSC). Two compositions were studied that contained 44 and 60 wt % poly( l -lact…
Silicatein is an enzyme isolated from the biosilica produced by the marine demosponge, Tethya aurantia. Once isolated from the sponge, silicatein can be used in vitro to catalyze the hydrolysis and direct polycondensation of a wide variety of alkoxide, ionic, and organometallic precursors to the corresponding chalcoge…
Abstract The relationship between the shape memory properties and thermomechanical cyclic conditions was investigated with a type of shape memory polyurethane (SMPU). The thermal and dynamic mechanical properties of the polyurethane were examined by using differential scanning calorimetry (DSC) and dynamic mechanical…
A tip for surface scientists: Tip-enhanced Raman spectroscopy (TERS) was used to record surface Raman spectra of benzenethiol and pyridine-4-thiol adsorbed on Au and Pt single-crystal surfaces (see picture). The benzenethiol spectra on the two surfaces are distinctly different. This result illustrates the power of TER…
The magnetic properties of the ferromagnetic semiconductor In0.98Mn0.02As were characterized by x-ray absorption spectroscopy and x-ray magnetic circular dichroism. The Mn exhibits an atomic-like L2,3 absorption spectrum that indicates that the 3d states are highly localized. In addition, a large dichroism at the Mn L…
The spin-chain compounds, Ca3CuIrO6 and Ca3CuRhO6, crystallizing in a K4CdCl6-derived monoclinic structure, are investigated by ac and dc magnetization, isothermal remnant magnetization as well as heat capacity measurements. The results reveal the existence of a magnetic ordering in the vicinity of 15 K for both the c…
The elastic properties of the $B_1$-structured transition-metal nitrides and their carbide counterparts are studied using the {\it ab initio\} density functional perturbation theory. The linear response results of elastic constants are in excellent agreement with those obtained from numerical derivative methods, and a…
We report the dielectric response of La1.5Sr0.5NiO4, a system that experiences charge ordering above room temperature (TCO=480K) and a rearrangement of its charge-order pattern in the temperature region 160–200K. A careful analysis of the role of the electrical contacts used, sample thickness, and grain size on the ex…