Fabrication and Characterization of Gecko-inspired Dry Adhesion, Superhydrophobicity and Wet Self-cleaning Surfaces

作     者：Yongchao Zhang Shuxin Qu Xiang Cheng Xueling Gao Xia Guo 

作者机构：Key Lab of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China The Hong Kong Polytechnic University Department of Rehabilitation Sciences Kowloon Hong Kong 999077 China 

出 版 物：《Journal of Bionic Engineering》 (仿生工程学报（英文版）)

年 卷 期：2016年第13卷第1期

页      面：132-142页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0836[工学-生物工程] 0702[理学-物理学] 

基　　金：supported by the National Basic Research Program of China (973 Program) 国家自然科学基金 国家教育部高等学校博士学科点专项科研基金 Construction Program for Innovative Research Team of University in Sichuan Province a research fund from HKRITA 

主　　题：gecko-inspired microfiber polydimethylsiloxane surfaces surface properties counterface superhydrophobicity wet self-cleaning 

摘      要：In this study, gecko-inspired polydimethylsiloxane （PDMS） microfiber surfaces were fabricated by combining Inductively Coupled Plasma （ICP） and micro-mold casting. The effect of roughness and surface energy of counterface on the adhesion of gecko-inspired microflber surfaces and its superhydrophobicity and wet self-cleaning were studied. The adhesion of gecko-inspired microfiber surfaces depended on the roughness of the eounterfaces due to the influences of contact area and interlocking mechanism. SEM images of interfaces between counterfaces with different roughness and gecko-inspired mi- crofiber surfaces revealed the matched and dis-matched contact directly. The gecko-inspired microfiber surface got the larger adhesive force from the higher surface energy counterface, which is consisted with Johnson-Kendall-Roberts （JKR） theory. The smaller dimension and lower duty ratio of microfibers on PDMS resulted in the increasing of Water Contact Angle （WCA） and the decreasing of Sliding Angle （SA） compared to those of smooth PDMS. Particularly, sample P-8-28-20 had the biggest WCA （155°） and SA （7°）, which displayed the superhydrophobicity and the best wet self-cleaning efficiency in all samples. The present studies showed that the roughness and surface energy of counterface both affected the adhesion of gecko-inspired microfiber surfaces. The smaller dimension and lower duty ratio of microfibers on PDMS endowed it with the superhydro- phobicity and the wet self-cleaning abilities.