Materials Literature
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Local fields in the vicinity of $^{111}\text{C}\text{d}(\ensuremath{\leftarrow}^{111}\text{I}\text{n})$ probes in different ZnO samples---0.5 at.% indium-doped and undoped---were measured by means of the time differential perturbed angular correlation method. Prominent aftereffect observed for the 0.5 at.% In-doped Zn…
Formsache: Palladiumkatalysierte Kreuzkupplungen von Borylporphyrinen führten zu einem Dimer und zwei Arten von Trimeren mit β-β-Thienylenverbrückung (siehe Bild; grau C, weiß H, pink Ni, gelb S, blau N). Das leiterförmige Trimer hat einen sehr großen Zweiphotonenabsorptionsquerschnitt (17 300 GM) bei 800 nm, der ents…
Changing direction: Gold electrodes have been linked to CdS nanoparticles through a β-cyclodextrin bridging unit (see scheme). The encapsulation of I3− or N,N′-dioctyl-4,4′-bipyridinium (octyl viologen) in the β-cyclodextrin cavities leads to enhanced photocurrents that are direction-controlled by the nature of the gu…
We carry out a detailed deuterium nuclear magnetic resonance (NMR) study of local nematic ordering in polydomain nematic elastomers. This system has a close analogy to the random-anisotropy spin glass. We find that, in spite of the quadrupolar nematic symmetry in three dimensions requiring a first-order transition, th…
We demonstrate that a metamaterial formed by crossed metallic wires is characterized by an anomalously high index of refraction. Such property does not rely on a resonant response of the inclusions, but rather is a consequence of the ultrahigh density of the wires and of the strong electromagnetic interaction between…
Abstract In this work, the nonisothermal crystallization and subsequent melting behaviors of polypropylene (PP) nucleated with different nucleating agents (NAs) have been studied. α‐phase NA 1,3:2,4‐bis (3,4‐dimethylbenzylidene) sorbitol (DMDBS, Millad 3988), β‐phase NA aryl amides compound (TMB‐5), and their compound…
Abstract The effect of single walled carbon nanotube (SWCNT) fillers on the low temperature thermal properties and curing behavior of SWCNT‐silicone nanocomposite are reported for the first time. The SWCNT‐silicone composites were prepared by different mixing procedures and characterized by differential scanning calor…
The work reported here is concerned with the quantification and correlation drawn on the effect of nanoclay platelets in the lamella orders in the nanocomposites of poly[styrene- b- (ethylene- co -butylene)- b -styrene] triblock copolymer (SEBS) and polar-modified SEBSs by using small-angle X-ray scattering (SAXS) and…
In recent times, there has been a large increase in the number of protein structures deposited in the Protein Data Bank. Structural genomics initiatives have contributed to this expansion through their focus on high-throughput structural determination. This has fuelled advances in many of the techniques in the pipelin…
In Ordnung gebracht: YIII-, EuIII- und ErIII-Tris(ligand)-Komplexe des neuen chiralen Alkoxidliganden tBu2P(O)CH2CH(tBu)OH (HL) entstehen bevorzugt als C3-symmetrische Diastereomere. Somit liefert racemisches HL (RRR)- und (SSS)-[LnL3]-Komplexe, die die stereoselektive Polymerisation von rac-Lactid zu hoch isotaktisch…
The hydrogen storage material of Ti-doped Na alanate has been studied by using both experimental and theoretical Ti K-edge X-ray absorption near edge structure (XANES) analysis. The results suggest the existence of small TiAl x Ti y nanoclusters with not more than 13−35 atoms in NaAlH 4 after the intercalation of Ti a…
Quantum chemical calculations on single molecules were performed to provide insight into the decomposition mechanism of shocked RDX. These calculations complement time-resolved spectroscopy measurements on shock wave compressed RDX crystals (previous paper, this issue). It is proposed that unimolecular decomposition i…
Luminescent yttrium aluminum garnet (Y 3 Al 5 O 12 ) nanoparticles codoped with Ce 3+ and Eu 3+ (YAG:Ce 3+,Eu 3+ ) were continuously synthesized by directly feeding potassium hydroxide solution and a metal salt solution to supercritical water (SCW). The effects of the Ce 3+ -to-Eu 3+ concentration ratio on the photolu…
Sr 2 LnTaO 6 (Ln = lanthanides, Y, and In) ceramics were prepared by a solid-state route, and their vibrational phonon modes were investigated using Raman and infrared (IR) spectroscopic techniques. Lorentzian lines were used to fit the Raman spectra, which showed 24 bands in perfect agreement with theoretical calcula…
A question of shape: Palladium-catalyzed cross-coupling of borylporphyrins has led to the synthesis of a β-to-β thienylene-bridged porphyrin dimer and two types of trimer (see picture; gray C; white H, pink Ni, yellow S, blue N). The ladderlike trimer exhibits a very large two-photon absorption cross-section (17 300 G…
This paper deals with the effect of modification with alkali metals (Li, Na, K) in M x La 1− x Ni 0.3 Al 0.7 O 3− d ( x = 0, 0.2, 0.5, 0.8, and 1.0) mixed-oxide perovskites as catalysts for the dry reforming of methane to produce syngas. The perovskite-type oxides have been synthesized by a sol−gel method using propio…
Near-monodisperse Ni 1− x Cu x ( x = 0.2−0.8) bimetallic nanocrystals were synthesized by a one-pot thermolysis approach in oleylamine/1-octadecene, using metal acetylacetonates as precursors. The nanocrystals form large-area 2D superlattices, and display a catalytic synergistic effect in the hydrolysis of NaBH 4 to g…
Optical anisotropy in single-walled carbon nanotube thin film networks is reported. We obtain the real and imaginary parts of the in-(parallel) and out-of-plane (perpendicular) complex dielectric functions of the single-walled carbon nanotube (SWNT) thin films by combining transmission measurements at several incidenc…
The pH dependence of the structures of {Mo(154-x)} mixed-valence oxomolybdate giant clusters were investigated by synchrotron X-ray diffraction of systematically prepared crystals containing [Mo138O410(OH)20(OH2)46](40-) (1), [Mo138O410(OH)20(OH2)38](40-) (2), [Mo138O406(OH)16(OH2)46](28-) (3), [Mo142O400(OH)52(OH2)38…
Abstract The conversion of cellulose to dialdehyde cellulose (DAC) by treatment with aqueous periodate was studied by the CCOA method, which is a combination of gel permeation chromatography and carbonyl-selective fluorescence labeling. The beta-alkoxy-elimination reaction under alkaline conditions was used as a diagn…