The Construction Of Bionical Anti-fouling Skin And Anti-fouling Mechanism

Many creatures live in the marine environment for a long time,but their surface will not be subjected by the marine fouling.Inspired by the above phenomenon,this paper designed and prepared a new type of marine antifouling skin.The skin takes the dolphins and corals as bionic prototypes.On the one hand,the silicone rubber RTV-2 was selected as the substrate of the biomimetic antifouling film and the multi-layer graphene was used as the filler to prepare the GP(Grapheme platelet)film which has the features of high elastic dolphin skin.On the other hand,the way sarcophyton trocheliophorum secrete bacteriostatic substances to inhibit bacterial attachment is imitated to prepare the antifouling GP film.The antifouling GP film was prepared by adding the bacteriostatic on the basis of GP flilm.At the same time,some special structure was manufacted on the GP flilm according to the tentacle-like structure on the sarcophyton trocheliophorum surface.This final finished film is called antifouling skin.The micro electronic testing machine is used to test mechanical properties of the pure silica film,the graphene GP film and other three quaternary ammonium content(1%,3% and 6%)of antibacterial GP film.The results of the tensile and compression test show that:The silicone rubber RTV-2 as substrate materials has better mechanical properties,and the addition of graphene can further reduce the tensile and compressive modulus of the material.That is to say that the addition of graphene can make the material produce greater deformation when subjected the same external force.the prepared GP film.It make the prepared GP film more close to the dolphin skin.In addition,the tensile and compressive modulus of the antimicrobial GP film with different contents of quaternary ammonium don't change significantly,indicating that the addition of quaternary ammonium don't have a significant effect on the tensile and compressive modulus of the material.Compared the antibacterial capacity of the pure silica film,the graphene GP film and other three quaternary ammonium content(1%,3% and 6%)of antibacterial GP film in static water environment.Summed up the test results by comparing the changes of the adhered bacteria number and morphology on the film surface:The addition of organosilicon quaternary ammonium can effectively inhibit the growth and adhesion of bacteria,and the greater content of quaternary ammonium salt is not means the better effect.The 3% quaternary ammonium salt content GP film has the best antibacterial through the overall comparison.Compared the effect of four factors,including the distance between the tentacles,the tentacles' length,the arrangement of the tentacles on the antifouling skin surface and the velocity of the water,on the antibacterial effect.By using the comparative analysis of the designed orthogonal test,the primary and secondary relations and the optimal combination of the four factors are obtained.Through the analysis of the antibacterial mechanism found that: The erosion of the adhered surface of bacteria mostly occurs during the decline phase.The bacteria firmly adhere to the attached surface by using its own cell fluid and secretions to erode the attached surface.The anti-fouling skin designed by this article can effectively inhibit the growth of bacteria and extend the time the bacteria need to reach its decline phase.At the same time,the tentacles of the skin surface can effectively hinder the adhesion of bacteria under the dynamic water flow,and can effectively prevent the adhesion and erosion of bacteria through the synergistic effect of the material and structure.