Materials Literature
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Ordnung ist alles: Goldnanostrukturen wie Nanostäbe, -würfel, -polyeder und -bipyramiden bilden beim Verdampfen von Tröpfchen mit einer oder zwei Komponenten geordnete Aggregate, wobei die Anordnung der Nanostrukturen stark von deren Form und Größe abhängt. Anordnungen von Goldnanostäben lumineszieren bei Zweiphotonen…
Raman spectra of single-walled carbon nanotubes (SWNTs) with diameters of 0.6--1.3 nm have been studied under high pressure. A ``plateau'' in the pressure dependence of the $G$-band frequencies was observed in all experiments, both with and without pressure transmission medium. Near the onset of the $G$-band plateau,…
In this paper a novel one-step synthetic pathway that controls both functionality and morphology of functionalized periodic helical mesostructured silicas by the co-condensation of tetraethoxysilane and hydrophobic organoalkoxysilane using achiral surfactants as templates is reported. In contrast to previous methods,…
Shear-mechanical and dielectric measurements on the two monohydroxy (monoalcohol) molecular glass formers 2-ethyl-1-hexanol and 2-butanol close to the glass-transition temperature are presented. The shear-mechanical data are obtained using the piezoelectric shear-modulus gauge method covering frequencies from 1 mHz to…
ZnO and GaN have a type-II band offset. The incorporation of one compound into the other would lead to a reduced bandgap as compared to that of either ZnO or GaN. Our density-functional theory calculation reveals an asymmetric bandgap reduction in this nonisovalent system; i.e., incorporating GaN in a ZnO host results…
Currently, Y2O3–Al2O3 phase diagrams do not show the technologically significant yttrium aluminum garnet (Y3Al5O12,YAG) phase as deviating from the stoichiometric ratio, i.e., YAG is always expressed as a line compound. In this paper, we not only report the synthesis of nonstoichiometric YAG, but also the use of atomi…
An elliptical invisible cloak is proposed using a coordinate transformation in the elliptical-cylindrical coordinate system, which crushes the cloaked object to a line segment instead of a point. The elliptical cloak is reduced to a nearly circular cloak if the elliptical focus becomes very small. The advantage of the…
We demonstrate for the first time the feasibility of all-diamond integrated optic devices over large areas using a combination of photolithography, reactive ion etching (RIE) and focused ion beam (FIB) techniques. We confirm the viability of this scalable process by demonstrating guidance in a two-moded ridge waveguid…
Abstract The variation of the green strength of natural rubber (NR) with the preparation method of the film was studied to elucidate the origin of the stress–strain behavior characteristics of NR in connection with the structure of branch points in NR. A rubber film prepared via casting from NR latex showed the highes…
We report the design, fabrication, and measurement of a terahertz metamaterial composed of single geometry electric field coupled resonators that has two closely spaced electric resonances near 1.0 and 1.5THz. Due to the mutual coupling between the different resonances in the particle, the lower frequency resonance of…
Oligostilbenoids are polyphenols that are widely distributed in nature with multifaceted biological activities. To achieve biomimetic synthesis of unnatural derivatives, we subjected three resveratrol analogues to oligomerization by means of one-electron oxidants. Upon varying the metal oxidant (AgOAc, CuBr(2), FeCl(3…
Hydroxyapatite/silk biocompatible composites with unprecedented mechanical strength and toughness areproduced in a new process with theintegrated mineralization of macroporous silk fibroin scaffolds. Thebiomimetic bone-like composites areabsorbable and load-bearing with compressive strength, modulus, andtoughness comp…
Optical absorption spectroscopy of a single metal nanoparticle is used to characterize its properties and to obtain quantitative information on its local environment. Experiments were performed using the spatial modulation spectroscopy (SMS) technique on 16 nm mean diameter gold nanoparticles embedded in different med…
Abstract The degradation of polycaprolactone (PCL) in a solution of lipase and phosphate buffer has been characterized using a combination of differential scanning calorimetry (DSC) and electron microscopy. The molecular weight of the polymer initially appeared to determine the degradation rate while the degree of cry…
A stable radical: The title compound 1 has been synthesized as the first example of a meso-free variant and characterized as a strongly aromatic macrocycle with a spectacles-like planar conformation. The incorporation of free meso positions is promising for the exploration of novel structural and electronic properties.
Recently, scanning tunneling microscopy on Bi-2212 cuprate superconductor has revealed a spatial variation of the energy gap that is directly correlated with a modulation of the apical oxygen position. We identify two mechanisms by which out-of-plane oxygens can modulate the pairing interaction within the CuO_2 layer:…
Abstract Functional perovskite materials gain increasing significance due to their wide spectrum of attractive properties, including ferroelectric, ferromagnetic, conducting and multiferroic properties. Due to the developments of recent years, materials of this type can conveniently be grown, mainly by pulsed laser de…
Abstract A facile approach of solvent‐evaporation‐induced coating and self‐assembly is demonstrated for the mass preparation of ordered mesoporous carbon‐silica composite monoliths by using a polyether polyol‐based polyurethane (PU) foam as a sacrificial scaffold. The preparation is carried out using resol as a carbon…
We present a systematic angle-resolved photoemission spectroscopic study of the high-$Tc$ superconductor class ${(\text{Sr}/\text{Ba})}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}$. By utilizing a photon-energy-modulation contrast and scattering geometry we report the Fermi surface and the momentum…
Abstract The T g depression and kinetic behavior of stacked polystyrene ultrathin films is investigated by differential scanning calorimetry (DSC) and compared with the behavior of bulk polystyrene. The fictive temperature ( T f ) was measured as a function of cooling rate and as a function of aging time for aging tem…