Slippery liquid-infused porous surface (SLIPS) has garnered significant attention in marine anticorrosion and antifouling applications due to their slippery attributes. Nevertheless, it remains challenging to fulfill the protection requirements by relying exclusively on the barrier and anti-adhesion mechanisms of surface lubricating layer. In this work, a dual-functional slippery organogel coating was meticulously synthesized by introducing Ag(Ӏ)-imine coordination bonds into organosilicon networks, thereby endowing the coating with self-healing and antibacterial properties. A surface scratch with a width of 50 μm can be effectively repaired within 6 h at 60 °C, and the repair efficiency exceeds 85 %. In addition, the coating exhibits a dual antibacterial mechanism, which functions through both sterilization via the release of Ag + and antiadhesion due to its slippery properties. Following a 7-day cocultivation period with PAO1 bacteria, the coating retained 100 % bactericidal activity and 99.8 % resistance to bacterial adhesion. Moreover, the antialgal efficacy of the AP-TA 0.2 -Ag 1 @Oil coating against Chlorella and P. tricornutum increased by 99.9 % and 99.7 %, respectively. Furthermore, the combination of Ag(Ӏ)-imine coordination bonds and silicone oil effectively preserves the corrosion resistance of the coating. The EIS results demonstrated that the | Z | 0.01 Hz value of the slippery organogel coating was maintained at 1.07 × 10 7 Ω·cm 2 after immersion in 3.5 wt% NaCl solution for 14 days, suggesting excellent anticorrosion performance of the coating. This study provides a novel perspective for the development of marine protective coatings that possess antifouling, self-healing, and anticorrosive properties.
Xuejun Chen,Na Xu,Nan Li,Lican Lu,Yuanli Cai,Ying Zhao,Dujin Wang
We describe the programmable selectivity of intra-/inter-chain coordination in the subcomponent self-assembly of a primary amine based block copolymer. A well-defined poly(6-aminohexylmethacrylamide hydrochloride)-block-poly(N-2-hydroxypropylmethacrylamide) (PHPMA-b-PAHMA) was synthesized via visible light activated aqueous RAFT polymerisation at 25 °C. The conjugation of 2-hydroxy-5-methoxybenzaldehyde (HMBA) in the absence or presence of small fractions of the nickel ion complex was monitored using 1H NMR and UV spectroscopy. Subcomponent self-assembly and the programmable selectivity of intra-/inter-chain coordination were studied using dynamic light scattering and 1H NMR. The results demonstrated that the coordinated HMBA was much more reactive than the free HMBA, which promoted the collapse and hydrophobic association of polymer chains and thus brought about the autocatalysis of imine formation inside the collapsed “hot spots”. The polymer chains progressively assembled into narrowly-distributed nanoparticles on adding small fractions of NiII(HMBA)2 rather than autopoietically splitting into smaller ones, as observed on adding pure HMBA. More importantly, the diversity of subcomponent self-assembly and solubility of aggregates originated from the programmable selectivity of intra-/inter-chain coordination.
危险品化学品经营许可证（带存储）