Luminescence properties of self-activated Ca Mg Zn(VO ) and Ca Mg Zn(VO ) :xEu phosphors.

Self-activated Ca Mg Zn(VO ) and Ca Mg Zn(VO ) :xEu phosphors were synthesized via a high-temperature solid-state reaction route. The crystalline structure and luminescence properties of the phosphors were analyzed using an X-ray diffractometer and a photoluminescence spectrometer. The explored results indicated that by varying calcination temperature and the raw material ratio of Ca /Mg /Zn , the phosphors could be developed with different phases, crystallinity, and various fluorescence performances.

The preparation of a difunctional porous β-tricalcium phosphate scaffold with excellent compressive strength and antibacterial properties.

Porous β-tricalcium phosphate (β-Ca(PO), β-TCP) scaffolds are widely applied in the field of bone tissue engineering due to their nontoxicity, degradability, biocompatibility, and osteoinductivity. However, poor compressive strength and a lack of antibacterial properties have hindered their clinical application. In order to address these disadvantages, graphene (G) and silver nanoparticles were introduced into β-TCP through a two-step method.

Cu-supported nitrogen-doped carbon nanofibers with hierarchical three-dimensional net structure as binder-free anodes for enhanced lithium-ion batteries.

Cu-supported nitrogen-doped carbon nanofibers (NCNFs) were fabricated via electrospinning and subsequent activation treatment with poly vinylpyrrolidone as both carbon and nitrogen sources. The NCNFs are firmly adhered to Cu foil without any additional binder and form a hierarchical three-dimensional net structure, which could effectively shorten the diffusion paths for electrons and lithium ions, thus resulting in lower impedance and superior electrochemical properties. Additionally, NCNFs feature a amorphous carbon structure, N-rich carbon lattice and wide pore distribution, not only ensuring fast ions/electrons transport, but also giving rise to the higher energy density.

Preparation and properties of calcium citrate nanosheets for bone graft substitute.

A convenient and effective soft chemical method is presented for the synthesis of nano-scaled calcium citrate sheets. The preparation involved the precipitation of nano-calcium citrate by adding ethanol to reach the super saturation state of a solution containing calcium and citrate salts. The obtained nano-calcium citrate formed nanosheets, with the following dimensions: width of about 50∼500 nm and thickness of about 8∼30 nm.

Synthesis of cobalt nanowires in aqueous solution under an external magnetic field.

In contrast to the majority of related experiments, which are carried out in organic solvents at high temperatures and pressures, cobalt nanowires were synthesized by chemical reduction in aqueous solution with the assistance of polyvinylpyrrolidone (PVP) as surfactant under moderate conditions for the first time, while an external magnetic field of 40 mT was applied. Uniform linear cobalt nanowires with relatively smooth surfaces and firm structure were obtained and possessed an average diameter of about 100 nm with a coating layer of PVP. By comparison, the external magnetic field and PVP were proven to have a crucial influence on the morphology and the size of the synthesized cobalt nanowires.

Self-assembly mechanism of Ni nanowires prepared with an external magnetic field.

Nickel nanowires with a mean diameter of about 95 nm and lengths of up to 26 μm were prepared by a chemical reduction method in aqueous solution under an external magnetic field. The self-assembly mechanism was investigated in detail. The results indicate that the self-assembly process of Ni nanowires consists of three stages: nucleation and growth, ordered alignment and self-assembly, and deposition on the surface and gaps between the nickel particles.

[Review on progress of research on drug releasing mechanism of chitosan microspheres].

Variety of drugs-loaded chitosan microspheres have been used as sustained release carrier in recent years, which has shown a good prospect in biomedical field. Therefore, chitosan microspheres have been one of the research hotspots in controlled release drug delivery system. Nowadays the research in releasing mechanism of drug-loaded chitosan microspheres lags obviously behind the research in preparation and application.