Bo Cai,Zihao Liu,Zhijia Zhang,Songsong Zhang,Qiang Wang,Teng Ma,Lin Wang,Xiaoji Liu,Guojun Wang,Hao Wei,Lei Wang
Inspired by the process of poison transport from in vivo to the skin of poison dart frogs, a novel polyurethane marine antifouling coating PU-xA is prepared, in which the antifouling agent N-(2,3,4-trihydroxy-5-acrylamide methylbenzyl)acrylamide (AMTHBA) would enrich at the surface of the coating due to phase separation. The surface morphology and properties of the composite coating are investigated through the transmittance and haze tester, the atomic force microscope (AFM), and the water contact angle. With the addition of AMTHBA, the water contact angle of the coating gradually decreases from 94.1°± 0.5° to 72.6°± 0.5°, and the surface energy increases from 30.8 to 42.1 J m − 2 . After being immersed in seawater for 28 days, the tensile strength and the elongation at break of PU-25A still kept 3.0 MPa and 136.3%, respectively. The antibacterial performance of the coating increases with the increase of storage time, and the antibacterial rate of PU-25A against Escherichia coli increases from 63.3% to 97.2% after 30 days of storage, and the antibacterial rate against Staphylococcus aureus increases from 59% to 80.1% after 30 days of storage. The outstanding resistance of seawater, antibacterial, and anti-algae adhesion of the PU-25A indicate that PU-25A has potential applications in the field of marine antifouling.
Inspired by the poison dart frog skin that secretes functional liquid after being stimulated, a liquid-infused double-layer surface (LDS) is designed by integrating superhydrophobic layer with liquid-infused layer. Both layers generate the wettability gradient to drive tiny condensed droplet into the liquid-infused layer, and the liquid-infused layer would effectively lower the freezing point for nonicing. Especially, the internal wetting transport ability appears between both layers, greatly reducing icing possibility of the surface, i.e., the tiny condensed droplets in the micropores can be transported to liquid-infused layer with nonfrozen properties. Thus, the surface of LDS thereby keeps superhydrophobic property for antiicing and antifrosting in a long term. This design makes LDS achieve excellent antiicing and antifrosting properties against cold environments with high humidity. And it may be significant for such materials to be extended into some realms, e.g., antiicing in aviation and power for long-term durability in cold and high moisture environment.
危险品化学品经营许可证（带存储）