(261g) Hagfish-Inspired Supramolecular Slippery Liquid-Infused Porous Surface (SLIPS) for Smart Marine Antifouling
AIChE Annual Meeting
2023
2023 AIChE Annual Meeting
Materials Engineering and Sciences Division
Bio-inspired Composites
Monday, November 6, 2023 - 2:10pm to 2:25pm
Marine biofoulings always has negative influence on marine industry, doing great harm to marine equipment and increaseing fuel consumption. Slippery liquid-infused porous surface (SLIPS) has been received widespread attention in antifouling field, while the insufficient controllability and durability of surface lubricity restrict the application of SLIPS in real ocean environment.
In this study, inspired by hagfish’s defensive behavior of secreting mucus to escape from predators, lubrication modes responsively switching and self-healing properties are introduced to improve these defects. The lubricity regulation of SLIPS is based on the responsive supramolecular interaction between azobenzene (Azo) and α-cyclodextrin (α-CD). Only trans-Azo can connected with α-CD firmly. Cis-Azo is converted to trans and combined with α-CD by supramolecular interaction under vis-light or heating, driving the shrinkage of polymer chains to squeeze the stored lubricant to surface. There is more lubricating liquid on surface after response, which makes SLIPS have better lubricity and more efficient antifouling performance.
Therefore, this smart SLIPS can adjust the surface lubricity to switch to different antifouling modes to meet different antifouling demands. When biofoulings booming during daytime or hot season, the coating can seep out lubricant and switch to "enhancive" mode. On the contrary, the coating suspends lubricant seepage at night or cold season, switching to "normal" mode and effective enough to fight against the less thriving biofoulings. Unnecessary waste of lubricating fluid is reduced, which has effective advantages in maintaining durability and service life. In addion, disulfide bonds (dynamic covalent bonds) and urea bonds (supramolecular effect of hydrogen bonds) are introduced to enhance the self-healing performance and durability.
Moreover, the “smart†SLIPS marine antifouling coating has lubricant responsive seepage, lubrication modes switching, stability (pH, centrifugation, salinity and dynamic flushing), self-healing (91.73%), self-cleaning, and anti-adhesion (protein, algae, bacteria and simulated barnacle) performance. Furthermore, the antifouling performance has been maintained for 180 days of boom season in real sea. In summary, the study provides an efficient strategy for designing “smartâ€bionic antifouling coatings and promotes the application of SLIPS materials in real neritic sea.
In this study, inspired by hagfish’s defensive behavior of secreting mucus to escape from predators, lubrication modes responsively switching and self-healing properties are introduced to improve these defects. The lubricity regulation of SLIPS is based on the responsive supramolecular interaction between azobenzene (Azo) and α-cyclodextrin (α-CD). Only trans-Azo can connected with α-CD firmly. Cis-Azo is converted to trans and combined with α-CD by supramolecular interaction under vis-light or heating, driving the shrinkage of polymer chains to squeeze the stored lubricant to surface. There is more lubricating liquid on surface after response, which makes SLIPS have better lubricity and more efficient antifouling performance.
Therefore, this smart SLIPS can adjust the surface lubricity to switch to different antifouling modes to meet different antifouling demands. When biofoulings booming during daytime or hot season, the coating can seep out lubricant and switch to "enhancive" mode. On the contrary, the coating suspends lubricant seepage at night or cold season, switching to "normal" mode and effective enough to fight against the less thriving biofoulings. Unnecessary waste of lubricating fluid is reduced, which has effective advantages in maintaining durability and service life. In addion, disulfide bonds (dynamic covalent bonds) and urea bonds (supramolecular effect of hydrogen bonds) are introduced to enhance the self-healing performance and durability.
Moreover, the “smart†SLIPS marine antifouling coating has lubricant responsive seepage, lubrication modes switching, stability (pH, centrifugation, salinity and dynamic flushing), self-healing (91.73%), self-cleaning, and anti-adhesion (protein, algae, bacteria and simulated barnacle) performance. Furthermore, the antifouling performance has been maintained for 180 days of boom season in real sea. In summary, the study provides an efficient strategy for designing “smartâ€bionic antifouling coatings and promotes the application of SLIPS materials in real neritic sea.