Design and preparation of nanoporous Ag–Cu alloys by dealloying Mg–(Ag,Cu)–Y metallic glasses for antibacterial applications
| Autor: | Wang Xiao, R. C. Xiao, Zi-An Li, Xiaobo Chen, Ran Li, Tao Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Amorphous metal
Aqueous solution Materials science Nanoporous Alloy Biomedical Engineering 02 engineering and technology General Chemistry General Medicine engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Specific surface area Phase (matter) engineering General Materials Science Atomic ratio 0210 nano-technology Solid solution Nuclear chemistry |
| Zdroj: | Journal of Materials Chemistry B. 7:4169-4176 |
| ISSN: | 2050-7518 2050-750X |
| Popis: | Three-dimensional nanoporous Ag–Cu alloys with an atomic ratio of Ag to Cu varying from 0 to 1.0 were fabricated by dealloying Mg–(Ag,Cu)–Y metallic glass precursors in 0.04 M H2SO4 aqueous solution. Supersaturated Ag(Cu) solid solution in the nanoporous structure was obtained with a high Cu concentration (up to 47.4%) in the fcc Ag phase after the dealloying treatment. The nanoporous alloys with an ultrafine ligament size (down to 20 nm), a large specific surface area (up to 11.18 m2 g−1) and high oxidation resistance in air atmosphere were employed for inhibiting the growth of Gram-negative E. coli and Gram-positive S. aureus. In vitro characterization reveals that the nanoporous alloy with an Ag/Cu ratio of 1 : 1 exhibited the best antibacterial activities in terms of both ultralow minimal inhibitory concentration (MIC) (down to 3 and 2.5 mg L−1 for S. aureus and E. coli) and long-term inhibition on bacterial growth in the group of the tested materials. A highly efficient and sustainable release of Cu ions from the nanoporous Ag–Cu alloy could be responsible for such excellent antibacterial activities. |
| Databáze: | OpenAIRE |
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