Preparation Of Inorganic Nanometer Antibacteria Agent And Their Antibacterial Mechanism In The Natural Fabric

With the widespread application of the inorganic nanometer materials in our life, there have been many phenomenons which the traditional inorganic antibacterial mechanism can not explain. And the study of the inorganic nanomaterials antibacterial process presents the characteristics of multiple disciplines such as Materials science, Catalytic chemistry and Microbiology, So the researches are faced with severe challenges in this field.In the paper, we discussed the antibacterial process of inorganic nanometer antibacterial materials on the basis of the Synthetize of nano-ZnO, nano-TiO₂ and nano-AgI, and put forward a new antibacterial theory. The ZnO nanoparticles were prepared by liquid phase deposition, Nano-TiO₂ was synthesized through sol-gel technique and nano AgI were prepared by micro-emulsion. XRD,TG-DSC,SEM and TEM were used to characterize the properties of the as-synthesized samples. Further more, we use the disperison technique to make the nanopowders into antibacterial finishing. Then the fabrics were treated separately by nano-ZnO, nano-TiO₂, nano-AgI antibacterial liquid through the conventional finishing process. And the antibacterial property of the treated fabrics were tesed and the results were discussed. We point out the limitation of the antibacterial mechanism and establish a new hole antibacterial model.The main research work and results are as follows:(1) The ZnO nanoparticles were synthesized by using zinc nitrate and ammonia as the raw materials in liquid phase, the average size is about 20nm; The precursor of nanometer TiO₂ was synthesized with sol-gel method. The anatase nano-TiO₂ and the rutile nano- TiO₂ were got separately under the temperature of 600 and 700,which the average sizes are about 15nm and 20nm; nano-AgI is synthesized by microemulsion method using paraffin as emulsifier, the average size is about 30nm.(2) We make the nanopowders into antibacterial finishing, and use conventional finishing process to get antibacterial textiles.(3) The treated silk and cotton fabric via ZnO nanofluids possess durable anti-bacterial effect, and the experiments show that the treated frabrics still have very good antibacterial time permanence; The treated fabric via TiO₂ nanofluids also have an excellent antibacterial property. And the antibacterial of anatase nano-TiO₂ is better than the rutile nano-TiO₂; The treated fabric via AgI nanofluids also have an excellent antibacterial effect.(4) The limitation of the metal ions dissloution antibacterial mechanism was analyzed through the pH of the antibacterial environment, antibacterial durability and the antibacterial testing of nano- AgI; For light catalyzing mechanism, we design the antibacterial experiments of the treated fabric with light and without light; The experiments show that the treated fabrics have an excellent antibacterial effect without light. And according to the results of our experiments, we prove the photocatalytic antimicrobial exist certain limitations.(5)we put forward a new hole antibacterial mechanism and establish a new hole antibacterial model. Namely, the holes of the inorganic nanomaterials react with water and oxygen to produce antibacterial factors. The strong oxidability of the antibacterial factors can damage microbial cell proliferation, eventually lead to inhibit or kill bacteria.