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排序方式: 共有238条查询结果,搜索用时 15 毫秒
91.
The synthesis of RbKLiAlF6 via a sol‐gel route is described. The crystal structure has been determined using Rietveld‐refinement. It is shown that the compound crystallizes in the hexagonal 12L‐structure of the Cs2NaCrF6‐type (space‐group ) with a = 5.7195Å, c = 27.8655(4) Å and therefore belongs to the family of hexagonal elpasolites being the first example for an Al‐elpasolite with three different alkali metals. Further insights regarding structural details could be gained using 87Rb MAS NMR spectroscopy. 相似文献
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The structure of ammonium gallium cryolite (NH(4))(3)GaF(6) was investigated by (19)F and (69,71)Ga magic-angle spinning (MAS) NMR in comparison with X-ray powder diffraction followed by Rietveld refinement. In agreement with previous thermodynamic measurements, NMR experiments on (NH(4))(3)GaF(6) support the model of rigid GaF(6) octahedra. At high spinning speeds (30 kHz), the scalar coupling between the six equivalent (19)F nuclei and (69,71)Ga can be directly observed in the powder spectra. The coupling constants are J(19)F(69)Ga = 197 Hz and J(19)F(71)Ga = 264 Hz. To explain the (71)Ga spectra recorded at 3 kHz a small distribution of quadrupolar frequencies has to be included. The spread of the spinning sidebands hints to a largest nu(Q) value of 28 kHz for (71)Ga. This can be explained by the occurrence of highly symmetric GaF(6) octahedra, which are tilted against the surrounding atoms. In addition, the incomplete motional excitation does not average out the quadrupolar effects. NMR findings are in discrepancy to those of Rietveld refinement. As result it appears that X-ray diffraction is not sensitive enough to deliver proper results. 相似文献
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Akhilesh K. Gaharwar Patrick J. Schexnailder Avinash Dundigalla James D. White Cristina R. Matos‐Prez Joshua L. Cloud Soenke Seifert Jonathan J. Wilker Gudrun Schmidt 《Macromolecular rapid communications》2011,32(1):50-57
Here, we show that a poly(ethylene oxide) polymer can be physically cross‐linked with silicate nanoparticles (Laponite) to yield highly extensible, bio‐nanocomposite fibers that, upon pulling, stretch to extreme lengths and crystallize polymer chains. We find that both, nanometer structures and mechanical properties of the fibers respond to mechanical deformation by exhibiting strain‐induced crystallization and high elongation. We explore the structural characteristics using X‐ray scattering and the mechanical properties of the dried fibers made from hydrogels in order to determine feasibility for eventual biomedical use and to map out directions for further materials development.
96.
Ruri Agung Wahyuono Dr. Guobin Jia Dr. Jonathan Plentz Andrea Dellith Jan Dellith Felix Herrmann-Westendorf Dr. Martin Seyring Dr. Martin Presselt Dr. Gudrun Andrä Prof. Dr. Markus Rettenmayr Prof. Dr. Benjamin Dietzek 《Chemphyschem》2019,20(24):3336-3345
We describe the preparation and properties of bilayers of graphene- and multi-walled carbon nanotubes (MWCNTs) as an alternative to conventionally used platinum-based counter electrode for dye-sensitized solar cells (DSSC). The counter electrodes were prepared by a simple and easy-to-implement double self-assembly process. The preparation allows for controlling the surface roughness of electrode in a layer-by-layer deposition. Annealing under N2 atmosphere improves the electrode's conductivity and the catalytic activity of graphene and MWCNTs to reduce the I3− species within the electrolyte of the DSSC. The performance of different counter-electrodes is compared for ZnO photoanode-based DSSCs. Bilayer electrodes show higher power conversion efficiencies than monolayer graphene electrodes or monolayer MWCNTs electrodes. The bilayer graphene (bottom)/MWCNTs (top) counter electrode-based DSSC exhibits a maximum power conversion efficiency of 4.1 % exceeding the efficiency of a reference DSSC with a thin film platinum counter electrode (efficiency of 3.4 %). In addition, the double self-assembled counter electrodes are mechanically stable, which enables their recycling for DSSCs fabrication without significant loss of the solar cell performance. 相似文献
97.
The leaving group of the initial RAFT agent is one key factor during the initialization period of the RAFT polymerization. Benzyl-, Phenylethyl- and Cumyl Dithiobenzoate RAFT mediated bulk polymerization of styrene at 120 °C was investigated by direct measurement of the concentration of the RAFT agent and determination of the molecular weight in the initial phase of the RAFT polymerization using Size Exclusion Chromatography (SEC). The initialization period can be described by means of two transfer coefficients that are determined by the stability of the free-radical leaving group. By means of a Monte Carlo simulation the RAFT initialization process was characterized and the transfer coefficients from the experimental data were determined. 相似文献
98.
We investigate the phase transition behavior and dissolution resistant properties of thermo‐sensitive nanocomposite hydrogels made from PEO‐PPO‐PEO triblock copolymer (Pluronic F127) and Laponite silicate nanoparticles. The rapid dissolution properties of F127 copolymer hydrogels usually limit their use as sustained release drug carriers. We overcome this limitation by synergistic combination of nanoparticle gelation characteristics with polymer thermo‐sensitivity. We present a proof of concept that the temperature‐dependent phase transitions can be shifted as a function of hydrogel composition and that the dissolution of the polymer hydrogels as well as the release of a model drug, albumin, can be significantly slowed down by addition of nanoparticles. The dissolution resistant properties generated will prove useful in the future formulation, processing and application of our polymer hydrogels for sustained release drug delivery carriers.
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