An ultimately selective photorelease system of chitosan-nanoparticles is constructed. Only under unique aspects of tumor-hypoxia physiological conditions, the preliminary locked phototrigger is unlocked by biological reduction to enable the release of the caged drug either by visible light or two-photon near-IR (NIR) excitation. This approach provides a highly discriminating photorelease of anticancer drug to hypoxic tumor cells, but not to healthy normal cells.
Co nanoparticles embedded in N-doped carbon nanotube polyhedra are fabricated via a novel low-temperature KCl-assisted thermolysis strategy using MOFs as precursors for boosting ORR and OER performances.
Lead hydroxyl compounds are known as rutile flotation of the traditional activated component, but the optimum pH range for flotation is 2-3 using styryl phosphoric acid (SPA) as collector, without lead hydroxyl compounds in slurry solution. In this study, Bi 3+ ions as a novel activator was investigated. The results revealed that the presence of Bi 3+ ions increased the surface potential, due to the specific adsorption of hydroxyl compounds, which greatly increases the adsorption capacity of SPA on the rutile surface. Bi 3+ ions increased the activation sites through the form of hydroxyl species adsorbing on the rutile surface and occupying the steric position of the original Ca 2+ ions. The proton substitution reaction occurred between the hydroxyl species of Bi 3+ ions (Bi(OH) n +(3−n)) and the hydroxylated rutile surface, producing the compounds of Ti-O-Bi 2+. The micro-flotation tests results suggested that Bi 3+ ions could improve the flotation recovery of rutile from 61% to 90%, and from 61% to 64% for Pb 2+ ions.
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