Preparation And Bacteriostatic Property Of Biomimetic Materials Based On Microstructure Of Insect Wing Surface

Insect is the only flying invertebrate.The insect wings display the most complicated surfaces in nature.Due to the special properties such as superhydrophobicity,rapid thermal conductivity and fluorescence,the insect wing is attracting more and more attention of the researchers from all over the world.The studies on the surface structure of insect wing and the bionic application have been developing rapidly,and have yielded remarkable achievements.In this paper,we selected the wings of Bombus terrestris,Cryptotympana atrata and Pantala flavescens as the study materials.The microstructure of the wing surface was observed.The contact angle of the wing surface was measured.The chemical composition of the wing was analyzed.The antibacterial properties of the biomimetic polymer films were studied with the insect wings as templates.The results show that the insect wings are composed mainly of natural hydrophobic materials including proteins,lipids,etc.The wing surfaces possess multi-dimensional micro/nano structure.The high hydrophobicity(water contact angle 106.3~150.6°)of wing surface result from the cooperation of structural element and chemical composition.The prepared biomimetic PDMS films have the hierarchical rough structure copying the wing surface and good antibacterial effect.The average bacteriostatic rings of the biomimetic films mimicking the three species insect's wing are 6.0 mm(24 h cultivation)and 6.5 mm(48 h cultivation),respectively.The largest bacteriostatic rings(7.0 mm for 24 h cultivation,8.0 mm for 48 h cultivation)are found on the biomimetic films mimicking the reverse side of Cryptotympana atrata's hind wing.The antibacterial property of the biomimetic films results from both physical effect and chemical effect.The results may provide theoretical evidence and experimental methodology for the design of bionic functional materials and the study of antibacterial properties of biomimetic materials.