A Self-Strengthening Epidermis-Like Smart Coating Enabled by Dynamic Iron Sequestration  

作　　者：Xiaodong Qi Lei Yang Ying Hou Jiaqi Zhu Ming Yang Shouhua Feng 

机构地区：[1]Key Laboratory of Microsystems and Micronanostructures Manufacturing,Harbin Institute of Technology,Harbin 150080 [2]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,Jilin University,Changchun 130012

出　　处：《CCS Chemistry》2021年第11期2655-2668,共14页中国化学会会刊（英文）

基　　金：M.Y.thanks the National Natural Science Foundation of China(grant no.22071075)for financial support;S.H.Feng thanks the National Natural Science Foundation of China(grant nos.21831003 and 91959201)for financial support.

摘　　要：Living organisms rely on materials sequestration from the environment to strengthen their bodies.Such constant activity provides necessary supplies for critical biological functions,which is difficult by man-made structures due to the lack of a dynamic sequestration mechanism.In this study,it is shown that an epidermis-like smart coating can respond to changes in salinity to allow a spontaneous and progressive strengthening when supported by steel as a sustained iron source.The self-strengthening is enabled by reaction-coupled diffusion,which makes possible the dynamic sequestration of iron from the in situ rusted steel,partially mimicking the iron accumulation process in a mussel.The emergence of iron-phenolic coordination bonds continuously improves modulus,hardness,and adhesion,achieving a strengthening efficiency comparable to mussel byssus.Interestingly,the bilayer design ensures long-term self-healing performance even during strengthening and a mechanically robust anticorrosion coating with an autonomic protection mechanism and gradually enhanced barrier properties during prolonged service.Our results provide a new venue for the design of stimuli-responsive smart materials characteristic of an open biological system and may serve as the basis for creating highly intelligent devices with sophisticated functionality.

关 键 词：biomimetics SELF-STRENGTHENING selfhealing smart coating epidermis-like 

分 类 号：TB34[一般工业技术—材料科学与工程]