Antifouling mechanism of natural product-based coatings investigated by digital holographic microscopy  

作　　者：Jiansen Pan Qingmei Peng Guoliang Zhang Qingyi Xie Xiangjun Gong Pei-Yuan Qian Chunfeng Ma Guangzhao Zhang 

机构地区：[1]Faculty of Materials Science and Engineering,South China University of Technology,Guangzhou,510640,China [2]Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou,510640,China [3]Department of Ocean Science and Division of Life Science,Hong Kong University of Science and Technology,Hong Kong,China

出　　处：《Journal of Materials Science & Technology》2021年第25期200-207,共8页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51673074,21973032 and 21637001);the Fundamental Research Funds for the Central Universities(No.2019ZD02);the Fund of the Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province(No.2019B030301003)。

摘　　要：Using natural product-based antifouling coatings has proven to be an effective strategy to combat biofouling.However,their antifouling mechanisms are still unclear.In this study,the antifouling mechanism of natural product-based coatings consisting of bio-sourced poly(lactic acid)-based polyurethane and ecofriendly antifoulant(butenolide)derived from marine bacteria was revealed by observing 3D bacterial motions utilizing a 3D tracking technique-digital holographic microscopy(DHM).As butenolide content increases,the density of planktonic marine bacteria(Pseudomonas sp.)near the surface decreases and thus leads to a reduced adhesion,indicating that butenolide elicits the adaptive response of Pseudomonas sp.to escape from the surface.Meanwhile,among these remained cells,an increased percentage is found to undergo subdiffusive motions compared with the case of smaller dose of butenolide.Further experiments show that butenolide can accelerate their swimming velocity and reduce flick frequency.Antibacterial assay confirms that butenolide-based coating shows high efficacy of antifouling performance against Pseudomonas sp.but without killing them like 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one(DCOIT).

关 键 词：Antifouling coatings Biodegradable polymer Natural antifoulant BUTENOLIDE Digital holographic microscopy 

分 类 号：TQ637[化学工程—精细化工]