ABSTRACT
Nitric oxide (NO) and reactive oxygen species (ROS) embody excellent potential in cancer therapy. However, as a small molecule, their targeted delivery and precise, controllable release are urgently needed to achieve accurate cancer therapy. In this paper, a novel US-responsive bifunctional molecule (SD) and hyaluronic acid-modified MnO2 nanocarrier was developed, and a US-responsive NO and ROS controlled released nanoplatform was constructed. US can trigger SD to release ROS and NO simultaneously at the tumor site. Thus, SD served as acoustic sensitizer for sonodynamic therapy and NO donor for gas therapy. In the tumor microenvironment, the MnO2 nanocarrier can effectively deplete the highly expressed GSH, and the released Mn2+ can make H2O2 to produce .OH by Fenton-like reaction, which exhibited a strong chemodynamic effect. The high concentration of ROS and NO in cancer cell can induce cancer cell apoptosis ultimately. In addition, toxic ONOO-, which was generated by the reaction of NO and ROS, can effectively cause mitochondrial dysfunction, which induced the apoptosis of tumor cells. The 131I was labeled on the nanoplatform, which exhibited internal radiation therapy for tumor therapy. In -vitro and -vivo experiments showed that the nanoplatform has enhanced biocompatibility, and efficient anti-tumor potential, and it achieves synergistic sonodynamic/NO/chemodynamic/radionuclide therapy for cancer.
ABSTRACT
A facile three-step method is designed for large-scale preparation of a NiCo2O4@MnO2/nickel foam/MnO2 sandwich architecture with robust adhesion as an advanced electrode for high-performance supercapacitors. The synthesis contains the hydrothermal reaction of a cobalt-nickel hydroxide precursor on a nickel foam (NF) support and subsequent thermal conversion into spinel mesoporous NiCo2O4 nanowire arrays, followed by a hydrothermal oxidation reaction to synthesize NiCo2O4@MnO2/nickel foam/MnO2 sandwiches. Moreover, the tactics reported in this study enable easy control of the growth of NiCo2O4 on one side of the NF and MnO2 nanosheets on both sides of the NF to obtain novel NiCo2O4@MnO2/nickel foam/MnO2 sandwiches. Because of the unusual structural and compositional features, the obtained NiCo2O4@MnO2/nickel foam/MnO2 sandwiches manifest excellent performance with high specific capacitance (1.70 C cm-2 at 2 mA cm-2), exceptional rate capability (78.5% retention at 20 mA cm-2) and ultralong cycling stability (91% retention over 30 000 cycles at 20 mA cm-2) as a battery-type electrode material for supercapacitors. When further assembled into an aqueous hybrid supercapacitor, it can deliver an energy density of 53.5 W h kg-1 at a power density of 80 W kg-1 and 20.7 W h kg-1 at 8 kW kg-1. This novel sandwich electrode provides a new idea for improving the electrochemical performance of hybrid supercapacitors.
ABSTRACT
This study reports on single-walled carbon nanotubes (SWCNT) as templates for the preparation of 1D porous organic-inorganic hybrid composites. The in situ deposited SWCNT were sputter coated with Sn metal and thermally oxidized in air to form a SnO2/SWCNT nanowire framework on SiO2/Si substrate. Poly(acrylic acid) (PAA) was coated onto this scaffold through UV light-induced radical polymerization, which resulted in the final formation of hybrid composites. The structures of hybrid composites were investigated by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, and Raman spectroscopy. The results show that PAA was successfully coated and the structural advantage of nanowire was fairly maintained, which indicates that this framework is very stable for organic functionalization in solution. The simplicity of this method for the formation of porous organic-inorganic hybrid composites provides a potential application for nanoelectronic devices.
