We report a simple and effective carbon-free nanocoating strategy for large-scale synthesis of Mo 2 N nanolayer coated MoO 2 hollow nanostructures. This strategy only involves commercial MoO 3 powders reacted with reduced gas. The carbon-free nanocoating of Mo 2 N is highly effective in improving the electrochemical properties of MoO 2 , promising advanced batteries with high specific capacity up to 815 mA h g À1 , long cycle-life (e.g., >100 cycles) and high rate capability compared with the carbon nanocoating commonly used in electrode materials. The present nitride-nanocoating strategy is facile but effective, and therefore it is very promising for large-scale industrial production. It may be extended to prepare other metal oxides with nitride coating nanolayers to enhance their performances as electrode materials.
Broader contextRechargeable lithium-ion batteries (LIBs) have been recognized as the most promising power source for portable electronic devices and electrical/hybrid vehicles. Anode materials with high reversible capacity, long cycle life, high rate performance, high safety and low cost are urgently required for high performance LIBs. We report a simple and effective carbon-free nanocoating strategy for large-scale synthesis of Mo 2 N nanolayer coated MoO 2 hollow nanostructures. This nitride-nanocoating strategy only involves metal oxide nanomaterials reacted with reduced gas NH 3 . Compared to the commonly used carbon nanocoated or metal oxide coated electrode materials, such novel nitride-nanocoating is facile but highly effective in improving the electrochemical properties of the electrode materials, and it is very promising for large-scale industrial production.
Drug-loaded microneedle arrays for transdermal delivery of a chemotherapeutic drug were fabricated using multi-material microstereolithography (μSL). These arrays consisted of twenty-five poly(propylene fumarate) (PPF) microneedles, which were precisely orientated on the same polymeric substrate. To control the viscosity and improve the mechanical properties of the PPF, diethyl fumarate (DEF) was mixed with the polymer. Dacarbazine, which is widely used for skin cancer, was uniformly blended into the PPF/DEF solution prior to crosslinking. Each microneedle has a cylindrical base with a height of 700 μm and a conical tip with a height of 300 μm. Compression test results and characterization of the elastic moduli of the PPF/DEF (50:50) and PPF/drug mixtures indicated that the failure force was much larger than the theoretical skin insertion force. The release kinetics showed that dacarbazine can be released at a controlled rate for five weeks. The results demonstrated that the PPF-based drug-loaded microneedles are a potential method to treat skin carcinomas. In addition, μSL is an attractive manufacturing technique for biomedical applications, especially for micron-scale manufacturing.
China, pushes forwards novel applications of deep eutectic solvents in electrochemical deposition and controllable synthesis of nanostructured materials. Title: A versatile protocol for the ionothermal synthesis of nanostructured nickel compounds as energy storage materials from a choline chloride-based ionic liquid This novel work proposes a versatile and environmentally-benign ionothermal strategy to synthesize nanostructured nickel compounds as energy storage materials, including nanofl ower-like α-Ni(OH) 2 and NiO, octahedral Ni[NH 3 ] 6 Cl 2 , and porous NiCl 2 , from a choline-based ionic liquid system.
3D printing has enabled the design
of biomaterials into intricate
and customized scaffolds. However, current 3D printed biomaterial
scaffolds have potential drawbacks due to residual monomers, free-radical
initiators, solvents, or printing at elevated temperatures. This work
describes a solvent, initiator, and monomer-free degradable polyester
platform for room temperature 3D printing. Linoleic acid side chains
derived from soybean oil lowers the T
g and prevents packing and entanglement, ensuring that G″ > G′ during room temperature
printing.
Upon printing, cross-linking of pendant functionalized coumarin moieties
fixes the viscous filaments to elastomeric solids. Furthermore, the
modular design of the polyester platform enables conjugation of ligands,
as demonstrated by the conjugation of FITC to surface amines on the
3D printed scaffolds. This low modulus, printable polyester platform
addresses several design challenges in 3D printing of functional biomaterials
and could potentially be useful in many tissue engineering applications.
Na0.33V2O5 nanosheet-graphene hybrids were successfully fabricated for the first time via a two-step route involving a novel hydrothermal method and a freeze-drying technique. Uniform Na0.33V2O5 nanosheets with a thickness of about 30 nm are well-dispersed between graphene layers. The special sandwich-like nanostructures endow the hybrids with high discharge capacity, good cycling stability, and superior rate performance as cathodes for lithium storage. Desirable discharge capacities of 313, 232, 159, and 108 mA·h·g(-1) can be delivered at 0.3, 3, 6, and 9 A·g(-1), respectively. Moreover, the Na0.33V2O5-graphene hybrids can maintain a high discharge capacity of 199 mA·h·g(-1) after 400 cycles even at an extremely high current density of 4.5 A·g(-1), with an average fading rate of 0.03% per cycle.
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