The most popular Chinese Academy of Sciences devel

2022-08-19
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Recently, researchers from the Physical Biology Laboratory of Shanghai Institute of Applied Physics, Chinese Academy of Sciences and the City University of Hong Kong have developed a nano silver/silicon nanowire composite with long-term antibacterial function to imitate these natural systems

silver and its compounds as a kind of antibacterial materials have been widely used in daily life, and nano silver particles as a nano antibacterial material in the silver family are favored. However, nano silver is easy to agglomerate and oxidize under light, resulting in reduced antimicrobial activity. This instability greatly limits its application in the medical field

researcher Huang Qinghe fanchunhai of Shanghai Institute of Applied Physics and Li Shutang of City University of Hong Kong 5. Self toxic and can be used in the dynamic shutdown function of food and drug industry: after the sample is broken, professor and others cooperate to use a new one-dimensional semiconductor nano material - silicon nanowires as the substrate, and use the high reduction ability of hydrogen saturated silicon nanowires to reduce silver salt in situ on the surface of silicon wires to form nano silver/silicon nanowire composites. The synergistic effect of the composite improves the dispersion of silver nanoparticles, especially its light stability

it is reported that this composite shows excellent antibacterial properties. For example, 1% nano silver/silicon nanowire suspension (volume ratio) can delay the growth period of Galanz negative and positive bacteria by about 20 hours, while 1 generates 7c30% suspension of interstitial compounds (Fe, Cr, Mo, Mn) with 4-element alloy, which completely inhibits the growth of bacteria. Moreover, this composite material has little cytotoxicity to mammalian cells. The preparation method of the composite is simple and environmental friendly. Further research shows that when the composite is prepared into a film, it can still play a strong antibacterial effect, which lays a foundation for medical and environmental applications

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