Recent years have seen rapid development in bio-inspired materials for adhesion. However, it remains challenging to realize robust adhesion on rough aquatic surfaces. An inspiring natural model is the remora fish, which has evolved to retain powerful adhesion to hosts using a dorsal suction disc. We find that the remora suction disc has a unique fibrous architecture of vertically oriented collagen fibers that enable anisotropic mechanical properties and enhanced adhesion performance. In the engineered prototype, vertically oriented nylon fibers are embedded into the soft silicone matrix using electrostatic flocking. The anisotropic mechanical properties are validated in both natural and biomimetic suction discs. Furthermore, the biomimetic suction disc demonstrates an enhanced adhesion function with a maximum 62.5% increase in pull-off force and a 340% increase in attachment time compared with the silicone control. This work can shed light on natural adhesion mechanisms and inspire novel designs for aquatic soft adhesives and actuators.

近年来，生物启发性粘附材料的发展迅速。然而，在粗糙的水生表面上实现牢固的粘附仍然是挑战。令人振奋的自然模型是natural鱼，它已经进化为使用背吸盘对宿主保持强大的附着力。我们发现，Remora吸盘具有垂直定向胶原纤维的独特纤维结构，可实现各向异性的机械性能并增强粘合性能。在该工程原型中，使用静电植绒将垂直取向的尼龙纤维嵌入到柔软的有机硅基质中。天然和仿生吸盘均已验证了各向异性的机械性能。此外，仿生吸盘具有最高62的粘合功能。与硅胶对照组相比，拉拔力增加了5％，附着时间增加了340％。这项工作可以揭示自然的粘合机制，并激发出新颖的水生软粘合剂和促动器设计。