Summary: An attenuated total reflection FT‐IR spectroscopic study of the hydrogen bonding, molecular orientation, and crystalline phase transitions in polyamide 6 (PA6)/clay nanocomposite (PA6CN) fibers is proposed. The nanoscale dispersed clay layers lowered the degree of order of hydrogen bonding, affected little the hydrogen bonding strength, and increased the degree of orientation of both γ crystalline and overall domains. A partial γ to α phase transition appeared with time.
Schematic representation of the attenuated total reflection FT‐IR dichroism measurements. 相似文献
The construction of hybrid architectures for electrode materials has been demonstrated as an efficient strategy to boost sodium-storage properties because of the synergetic effect of each component. However, the fabrication of hybrid nanostructures with a rational structure and desired composition for effective sodium storage is still challenging. In this study, an integrated nanostructure composed of copper-substituted CoS2@CuxS double-shelled nanoboxes (denoted as Cu-CoS2@CuxS DSNBs) was synthesized through a rational metal–organic framework (MOF)-based templating strategy. The unique shell configuration and complex composition endow the Cu-CoS2@CuxS DSNBs with enhanced electrochemical performance in terms of superior rate capability and stable cyclability. 相似文献
Developing noble-metal-free bifunctional oxygen electrocatalysts is of great significance for energy conversion and storage systems. Herein, we have developed a transformation method for growing NiMn-based bimetal–organic framework (NiMn-MOF) nanosheets on multi-channel carbon fibers (MCCF) as a bifunctional oxygen electrocatalyst. Owing to the desired components and architecture, the MCCF/NiMn-MOFs manifest comparable electrocatalytic performance towards oxygen reduction reaction (ORR) with the commercial Pt/C electrocatalyst and superior performance towards oxygen evolution reaction (OER) to the benchmark RuO2 electrocatalyst. X-ray absorption fine structure (XAFS) spectroscopy and density functional theory (DFT) calculations reveal that the strong synergetic effect of adjacent Ni and Mn nodes within MCCF/NiMn-MOFs effectively promotes the thermodynamic formation of key *O and *OOH intermediates over active NiO6 centers towards fast ORR and OER kinetics. 相似文献
Hydroxyapatite (HAp) nanorods possess vast potential applications in various fields, and here HAp nanorods with high aspect ratio were synthesized via a convenient two‐stage precipitation‐hydrolysis process at 60°C under atmospheric pressure. The precursor of CaHPO4 at precipitation stage is well crystallized as nubby morphology with CTAB as surfactant, while CaHPO4 was dissolved and CTA+ stabilized the HAp nuclei during the hydrolysis stage. OH? ions were absorbed onto the active crystal surface, where Ca2+ and PO43+ reacted with OH? to make the nuclei grow into larger crystals, and highly crystalline HAp nanorods were obtained by Ostwald ripening. The loaded drug of IBU on the HAp crystals can be 100% released in 24 h. PVP modified HAp nanorods can increase the drug‐loading capacity and release drug faster than pure HAp nanorods. The results indicate that HAp nanorods modified with suitable surfactants are of great use in drug delivery system. 相似文献
We describe an experiment transforming large collections of L
a
TEX documents to more machine-understandable representations. Concretely, we are translating the collection of scientific publications
of the Cornell e-Print Archive (arχiv) using LaTeXML, a L
a
TEX to XML converter currently under development. While the long-term goal is a large body of scientific documents available
for semantic analysis, search indexing and other experimentation, the immediate goals are tools for creating such corpora.
The first task of our arXMLiv project is to develop LaTeXML bindings for the (thousands of) L
a
TEX classes and packages used in the arχiv collection, as well as methods for coping with the eccentricities that TEX encourages. We have created a distributed build system that runs LaTeXML over the collection, in part or entirely, while collecting statistics about missing bindings and other errors. This guides
debugging and development efforts, leading to iterative improvements in both the tools and the quality of the converted corpus.
The build system thus serves as both a production conversion engine and software test harness. We have now processed the complete
arχiv collection through 2006 consisting of more than 400,000 documents (a complete run is a processor-year-size undertaking),
continuously improving our success rate. We are now able to convert more than 90% of these documents to XHTML+MathML. We consider
over 60% to be successes, converted with no or minor warnings. While the remaining 30% can also be converted, their quality
is doubtful, due to unsupported macros or conversion errors. 相似文献