Materials Literature
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Die gebündelten Vorteile von Doppelhydroxid-Katalysatoren mit Schichtstruktur und Seltenerdmetallverbindungen vereinen die schichtförmigen Seltenerdmetallhydroxide (LRHs), [R4(OH)10(H2O)4]2+n (R=Y, Dy, Ho, Yb). Diese kristallinen Materialien schließen starre organische Anionen zwischen den LRH-Schichten ein (siehe Bil…
Nanometer-sized mixed metal oxide (MMO) particles (Zn1-xMgxO) with very precise stoichiometry are prepared employing a polymer-based method. The precursor is formed by loading a polyacrylate with metal ions followed by purification of the polymer metal ion complex via repeated precipitation/redissolution cycles. Calci…
The variation of anisotropic charge dynamics in the course of a filling-control insulator-metal transition (IMT) in La(1-x)Sr(x)VO3 has been investigated by measurements of optical conductivity spectra with the focus on the role of the t(2g)-orbital degree of freedom. The orbitally induced anisotropic feature of the M…
BaY2Si3O10, barium diyttrium trisilicate, is a new silicate grown from a molybdate-based flux. The structure is based on zigzag chains, parallel to [010], of edge-sharing distorted YO6 octahedra, linked by horseshoe-shaped trisilicate groups and Ba atoms in irregular eight-coordination. The layered character of the s…
A SWAXS (small- and wide-angle X-ray scattering) instrument was recently installed at the wiggler beamline BL17B3 of the National Synchrotron Radiation Research Center (NSRRC), Taiwan. The instrument, which is designed for studies of static and dynamic nanostructures and correlations between the nano (or meso ) struct…
A class of extended 2,5-disubstituted-1,3,4-oxadiazoles R1-C6H4-{OC2N2}-C6H4-R2 (R1 = R2 = C10H21O 1 a, p-C10H21O-C6H4-C[triple bond]C 3 a, p-CH3O-C6H4-C[triple bond]C 3 b; R1 = C10H21O, R2 = CH3O 1 b, (CH3)2N 1 c; F 1 d; R1 = C10H21O-C6H4-C[triple bond]C, R2 = C10H21O 2 a, CH3O 2 b, (CH3)2N 2 c, F 2 d) were prepared,…
Synthesis of a dendritic (soluble) hexanaphthylbenzene derivative is described in which the six naphthyl groups are connected to the central benzene ring in a propeller-shaped arrangement. Observation of multiple oxidation waves in its cyclic voltammogram as well as an intense charge-resonance transition (extending be…
The synthesis of carbon nanotubes (CNTs) has been proved to be greatly promoted by vapor metal catalysts, but the fast reaction feature and the required high-temperature environment involved in CNT evolution usually make it difficult for an insight into the evolution mechanism. Here, we successfully freeze the synthet…
A series of rigid linear and star-shaped pi-conjugated 2,2':6',2"-terpyridine derivatives with the C-C single-, double-, and triple-bond linkages have been developed through the Suzuki, the Sonogashira, and the Wittig reactions. Such large rigid ligands exhibit strong blue emission in dilute solutions. [structure: see…
A convenient nanotechnique is used to place analyte molecules between closely spaced silver-capped Si nanowires for investigating surface-enhanced Raman scattering (SERS). It is revealed that the SERS intensity (or sensitivity) is closely related to the etching time used to prepare the Si nanowires from wafer. As the…
The single life: The UV/Vis spectra together with the strong fluorescence emission of trifluoroethoxy-substituted zinc phthalocyanines conjugated with deoxyribonucleosides (see picture) suggest that these compounds prefer monomeric forms over aggregation. Their unique photosensitivity can be controlled by the addition…
A phosphorus-containing hybrid porphyrin was successfully prepared via the BF3-promoted dehydrative condensation between sigma4-phosphatripyrrane and 2,5-bis[hydroxy(phenyl)methyl]thiophene. The NMR and UV-vis absorption spectra, electrochemical measurements, and DFT calculations revealed that the sigma3-P,N2,S-hybrid…
Abstract The conducting polymer PEDOT is tested as a carbon substitute material for the DMFC anode. Electrochemical experiments are carried out in a three‐electrode half‐cell at room temperature. The first part of this paper focuses on the characterization of PEDOT and PEDOT‐PSS as a diffusion layer material. PEDOT/C…
α/β‐Si 3 N 4 composites with various α/β phase ratios were prepared by hot pressing at 1600°–1650°C with MgSiN 2 as sintering additives. An excellent combination of mechanical properties (Vickers indentation hardness of 23.1 GPa, fracture strength of about 1000MPa, and toughness of 6.3 MPa·m 1/2 ) could be obtained. C…
The response of carbon nanotubes to femtosecond laser pulses is studied with a nonadiabatic simulation technique, which accounts for the evolution of electronic and ionic degrees of freedom, and for the coupling with the external electromagnetic field. As a direct result of electronic excitation, three coherent breath…
The amazing water repellency of many biological surfaces, exemplified by lotus leaves, has recently received a great deal of interest. These surfaces, called superhydrophobic surfaces, exhibit water contact angles larger than 150 degrees and a low contact angle hysteresis because of both their low surface energy and h…
OBJECTIVES: Cell tracking using ultrasmall iron particles is well established in magnetic resonance imaging (MRI). However, in experimental models, intrinsic iron signals derived from erythrocytes mask the labeled cells. Therefore, we evaluated Gadofluorine M with other gadolinium chelates for a T1-weighted positive e…
The mechanisms of photoinduced charge transfer in composites of TiO 2 nanorods with a conjugated polymer (poly(2-methoxy-5-(2 -ethyl)(hexyloxy) 1,4-phenylenevinylene) (MEH-PPV) have been investigated by steady-state, time-resolved photoluminescence (PL) spectroscopy and photoluminescence excitation (PLE) spectroscopy.…
A cross-linked polyethyleneimine polymer containing the [ZnWZn2(H2O)2(ZnW9O34)2]12- polyoxometalate was prepared from branched polyethyleneimine (Mw = 600), the polyoxometalate, and a n-octylamine-epichlorohydrin cross-linking reagent. This catalytic assembly was active for the selective oxidation of 2-alkanols to 2-a…
The thermal decomposition mechanism of synthetic Al(OH) 3 (gibbsite) was studied in situ by neutron thermodiffractometry in an ambient atmosphere from room temperature to 600°C with 50°C steps. Gibbsite decomposed to yield AlO·(OH) (boehmite) and then poorly crystallized χ‐Al 2 O 3 . Rietveld analysis was used to refi…