Magnesium coated by different transition metals (TM: Ti, Nb, V, Co, Mo, or Ni) with a grain size in the nano-scale formed a core (Mg)–shell (TM) like structure which can catalyse dehydrogenation.
Phosphorus-
and sulfur-codoped graphitic carbon nitride has been
successfully synthesized by in situ thermal copolymerization of hexachlorocyclotriphosphazene
and thiourea. The phosphorus doping, together with the sulfur doping,
would enhance light trapping, surface area, and charge separation,
making it serve as a more efficient photocatalyst than its pure g-C3N4 and single-doped g-C3N4 counterpart for the removal of tetracycline (TC) and methyl orange
(MO). The optimum photocatalytic activities of a P-, S-codoped g-C3N4 sample for the degradation of TC and MO were
about 5.9 times and 7.1 times higher than that of individual g-C3N4, respectively. Furthermore, the optimum TOC
removal reached 70.33% and 55.37% for TC and MO within 120 min, respectively.
The introduction of a P atom and S atom could significantly change
the electronic property of g-C3N4 and suppress
the recombination of photogenerated charges. Moreover, the defects
in the framework of samples caused by the doping of P and S could
serve as centers to trap the photoinduced electrons, thus inhibiting
the charge recombination and improving its photocatalytic performance.
Biocompatible synthetic scaffolds with enhanced osteogenic and angiogenic capacity are of great interest for the repair of large (critical size) bone defects. In this study, we investigated an approach based on the controlled delivery of copper (Cu) ions from borate bioactive glass scaffolds for stimulating angiogenesis and osteogenesis in a rodent calvarial defect model. Borate glass scaffolds (pore size ¼ 200-400 mm) doped with varying amounts of Cu (0-3.0 wt% CuO) were created using a polymer foam replication technique. When immersed in simulated body fluid (SBF) in vitro, the scaffolds released Cu ions into the medium at a rate that was dependent on the amount of Cu in the glass and simultaneously converted to hydroxyapatite (HA). At the concentrations used, the Cu in the glass was not cytotoxic to human bone marrow derived stem cells (hBMSCs) cultured on the scaffolds and the alkaline phosphatase activity of the hBMSCs increased with increasing Cu in the glass. When implanted in rat calvarial defects for 8 weeks, the scaffolds doped with 3 wt% CuO showed a significantly better capacity to stimulate angiogenesis and regenerate bone when compared to the undoped glass scaffolds. Together, these results indicate that the controlled delivery of Cu ions from borate bioactive glass implants is a promising approach in healing bone defects.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.