Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
University of Chinese Academy of Sciences, Beijing 100039, China.
ACS Appl Bio Mater. 2021 Aug 16;4(8):6056-6064. doi: 10.1021/acsabm.1c00357. Epub 2021 Jul 9.
Microbiologically influenced corrosion (MIC) accelerates the corrosion and degradation of metal materials due to the settlement of microorganisms on the surface. However, environmentally friendly and efficient methods to fabricate antifouling and anticorrosion surfaces are still lacking. Inspired by , a slippery liquid-infused porous surface (SLIPS) has been proven to be an efficient way to inhibit settlement of microorganisms on the metal surface and the following MIC due to the existence of a mobile defect-free lubricant layer. However, the stability of the lubricant layer and substrate of the SLIPS prevented its long-term antifouling and anticorrosion application. Herein, a highly stable slippery organogel was fabricated by depositing a homogeneous mixture of PDMS (base and curing agent), silicone oil, triethoxyvinylsilane, and SiO on Q235 and curing in an oven. Triethoxyvinylsilane was not only able to cross-link with the curing agent of PDMS through hydrosilylation but also able to interlink the organogel and Q235 through condensation between the -OH of the metal surface and hydrolyzed siloxane. As a result, the adhesion force between the organogel without triethoxyvinylsilane and the substrate (0.45 MPa) increased to 1.50 MPa for the organogel with triethoxyvinylsilane and SiO. Also, the tensile strength of the organogel without SiO (0.97 MPa) increased to 3.88 MPa for the organogel with 2 wt % SiO because of the high elastic modulus of SiO, which was important to improving its stability under external force. In addition, the organogel showed stable oil distribution and slippery performance after spinning at 4000 rpm for 30 s. Then, the bacterial settlement demonstrated that the organogel could effectively inhibit sp. settlement on the substrate under both static and dynamic conditions. Finally, an electrochemical test indicated that the MIC could be effectively mitigated by the organogel. This study provides an efficient method to fabricate a highly stable slippery surface on a metal surface for its potential application in mitigating MIC.
微生物影响腐蚀（MIC）会加速金属材料的腐蚀和降解，这是由于微生物在表面上的沉降造成的。然而，制造防污和防腐表面的环保且高效的方法仍然缺乏。受启发，已证明滑液注入多孔表面（SLIPS）是一种有效的方法，可以抑制金属表面上微生物的沉降以及随后的 MIC，这是因为存在无缺陷的可移动润滑剂层。然而，SLIPS 的润滑剂层和基底的稳定性阻止了其在长期防污和防腐方面的应用。在此，通过在 Q235 上沉积均匀混合物 PDMS（基础和固化剂）、硅油、三乙氧基乙烯基硅烷和 SiO，并在烘箱中固化，制备了一种高度稳定的滑液有机凝胶。三乙氧基乙烯基硅烷不仅能够通过硅氢化反应与 PDMS 的固化剂交联，而且能够通过金属表面的-OH 与水解硅氧烷之间的缩合反应将有机凝胶与 Q235 交联。结果，无三乙氧基乙烯基硅烷的有机凝胶与基底之间的附着力（0.45 MPa）增加到有三乙氧基乙烯基硅烷和 SiO 的有机凝胶的 1.50 MPa。此外，由于 SiO 的高弹性模量，无 SiO 的有机凝胶的拉伸强度（0.97 MPa）增加到 3.88 MPa，这对于提高其在外部力作用下的稳定性很重要。此外，有机凝胶在以 4000 rpm 旋转 30 s 后显示出稳定的油分布和滑溜性能。然后，细菌沉降表明，在静态和动态条件下，有机凝胶可以有效地抑制 sp. 在基底上的沉降。最后，电化学测试表明，有机凝胶可以有效减轻 MIC。本研究为在金属表面上制造高度稳定的滑溜表面提供了一种有效的方法，可用于减轻 MIC。
