Research Of Bio-inspired Slippery Surface And Application On Microbiologically Induced Corrosion And Biofouling

Marine biofouling and marine microbiologically induced corrosion are great challenges for people, which is a serious obstacle to make full use of marine resources. It is of great importance to restrain the initial adhesion, and on the other hand, the adhesion has a great interaction with the wettability of the material surfaces. In this thesis, bio-inspired superhydrophobic surfaces and bio-inspired slippery liquid infused porous surfaces(SLIPS) were constructed to evaluate the antibiofouling power by etching methods and some technologies such as scanning electron microscopy(SEM), fluorescence microscope, electrochemical impendance spectroscopy(EIS) and so on were used. The main conclusions are as follows:(1) The bio-inspired SLIPS were prepared on Al substrate by three steps: etched by electrochemical method, modified with low surface energy materials and then infused with lubricant. The SLIPS have great performance in the inhibition of biofouling in simulated static and dynamic state of marine environment. This mainly depends on the presence of lubricant on Al that SRB can’t adhere. And also the SLIPS can prevent sulphate-reducing bacteria(SRB) induced corrosion. This is mainly because the lubrication infused in the porous surfaces isolates the substrate from the corrosive medium in the sea water.(2) The bio-inspired superhydrophobic surfaces were prepared on glass substrate by chemical etching and modifying method. The structure of glass surfaces after etching is rough and porous. The contact angle of the superhydrophobic surfaces is 158±3°with a small rolling angle. The transmittance of the etched glasses is 99.3%, which is higher than the blank glass(91.2%). The chemical etching mechanism may be the replacement of the modified ions such as K+, Na+ in the glass by OH- and the reconstruction of silicon oxygen tetrahedron.(3) The bio-inspired SLIPS were prepared on glass substrate by three steps: etched by chemical method, modified with low surface energy materials and then infused with lubricant. The transmittance of SLIPS is 97.6%. Then three different wettability surfaces were compared in the microbial adhesion experiment(SRB and green alga): the bare glass, the superhydrophobic surfaces and the SLIPS. The last two surfaces have great performance in the inhibition of biofouling, but the SLIPS can keep for longer time of antifouling because of the oil layer and selfhealing ability. The SLIPS can keep a steady transmittance in the inhibition of biofouling.