Materials Literature
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The crystal structure of johachidolite, CaAl[B 3 O 7 ], ( Cmma , a = 9.767(2), b = 11.723(3), c = 4.3718(5) A, V = 408.3(1) A 3 , Z = 4) has been refined ( R 1 = 2.5 %) from a light-green gem-quality crystal from the Mogok gem-mining district in Myanmar. A fragment from the same gem was measured by electron microprobe…
Poly(acrylic acid- co-3-azidopropyl acrylate) and poly(acrylic acid- co-propargyl acrylate) have been alternately fabricated into a multilayer via the click reaction. The layer-by-layer deposition was monitored with a quartz crystal microbalance with dissipation (QCM-D) in real time. The response of the multilayer und…
Back flip: Field-induced transformations between the two homogeneously chiral enantiomers of a bent-core mesogen (see picture) take place by two different mechanisms (A and B). Their combination leads to an unexpected field-induced chirality flipping (C) between the oppositely tilted structures without polarity revers…
Inside knowledge: The true internal structure of a complex concentric circular hexagonal mesostructure has been solved for the first time by using electron tomography. This technique allows the mesostructure containing closed rings to be differentiated from a closed helical mesostructure. The key step is the use of to…
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…