Chinese Academy Of Sciences Develops Long Term Antibacterial Composite Materials

Increased lighting stability can expand application area.

Recently, researchers at the Institute of physical biology, Shanghai Institute of Applied Physics, City University Hong Kong and the Chinese Academy of sciences have developed a nano silver / silicon nanowire composite material with long-acting antibacterial function.

Silver and its compounds have been widely used in daily life as a kind of antibacterial materials. Nano silver particles as a nano antibacterial material in the silver family are very popular. However, nano silver is easy to reunite and easy to oxidize under light. This instability greatly limits its application in medicine.

Huang Qinghe and Fan Chunhai, a researcher at Shanghai Institute of Applied Physics, and Professor Li Shutang, City University Hong Kong, have used a new type of one-dimensional semiconductor nanomaterial silicon. Nanowires As substrate, the silver nanosilicon composite material was formed by in-situ reduction of silver salt on the silicon wire surface by the high reduction ability of hydrogen saturated silicon nanowires. The synergistic effect of the composite improved the dispersion of silver nanoparticles, especially the stability of light.

According to introduction, this kind of Compound material It shows excellent antibacterial properties. For example, 1% of the nano silver / silicon nanowire suspension (volume ratio) can delay the growth period of Galanz negative bacteria and positive bacteria for about 20 hours, while 10% of the suspension completely inhibits bacterial growth. Moreover, this composite material has little cytotoxicity on mammalian cells. The preparation method of the composite is simple. environmental protection 。 Further studies show that when the composite is prepared into film, it can still play a strong bacteriostatic effect, which lays the foundation for medical and environmental applications.