Low-viscosity oils could potentially act as self-healing barrier coatings because they can readily fow and reconnect to heal minor damage.For the same reason,however,they typically do not form stable coatings on metal...Low-viscosity oils could potentially act as self-healing barrier coatings because they can readily fow and reconnect to heal minor damage.For the same reason,however,they typically do not form stable coatings on metal surfaces.Increasing viscosity helps to stabilize the oil coating,but it also slows down the healing process.Here,we report a strategy for creating highly stable oil coatings on metal surfaces without sacrifcing their remarkable self-healing properties.Low-viscosity oil flms can be immobilized on metal surfaces using lightweight microcapsules as thickeners,which form a dynamic network to prevent the creep of the coating.When the coating is scratched,oil around the opening can rapidly fow to cover the exposed area,reconnecting the particle network.Use of these coatings as anticorrosion barriers is demonstrated.Te coatings can be easily applied on metal surfaces,including those with complex geometries,both in air or under water,and remain stable even in turbulent water.Tey can protect metal in corrosive environments for extended periods of time and can self-heal repeatedly when scratched at the same spot.Such a strategy may ofer efective mitigation of the dangerous localized corrosion aggravated by minor imperfections or damage in protective coatings,which are typically hard to prevent or detect,but can drastically degrade metal properties.展开更多
基金The work was supported by the Ofce of Naval Research(ONR N000141612838)Jiaxing Huang thanks the support and research freedom ofered by a JITRI International Research Fellow Award and the Humboldt Research Award.Alane Tarianna O.Lim thanks the National Science Foundation for a Graduate Research Fellowship.Hee Dong Jang was supported by the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources,funded by the Ministry of Science,ICT and Future Planning.We thank Dr.J.Wu for help with TEM and C.Luo,P.He,R.H.Jhang,and Professor C.H.Chen for their assistance and helpful discussions in electrochemical tests.
文摘Low-viscosity oils could potentially act as self-healing barrier coatings because they can readily fow and reconnect to heal minor damage.For the same reason,however,they typically do not form stable coatings on metal surfaces.Increasing viscosity helps to stabilize the oil coating,but it also slows down the healing process.Here,we report a strategy for creating highly stable oil coatings on metal surfaces without sacrifcing their remarkable self-healing properties.Low-viscosity oil flms can be immobilized on metal surfaces using lightweight microcapsules as thickeners,which form a dynamic network to prevent the creep of the coating.When the coating is scratched,oil around the opening can rapidly fow to cover the exposed area,reconnecting the particle network.Use of these coatings as anticorrosion barriers is demonstrated.Te coatings can be easily applied on metal surfaces,including those with complex geometries,both in air or under water,and remain stable even in turbulent water.Tey can protect metal in corrosive environments for extended periods of time and can self-heal repeatedly when scratched at the same spot.Such a strategy may ofer efective mitigation of the dangerous localized corrosion aggravated by minor imperfections or damage in protective coatings,which are typically hard to prevent or detect,but can drastically degrade metal properties.
