Inspired by geckos, fibrillar microstructures hold great promise as controllable and reversible adhesives in the engineering field. However, enhancing the adhesion strength and stability of gecko-inspired adhesives (GIAs) under complex real-world contact conditions, such as rough surfaces and varying force fields, is crucial for its commercialization, yet further research is lacking. Here, we propose a hierarchically designed GIA, which features a silicone foam (SF) backing layer and a film-terminated fibrillar microstructure under a subtle multiscale design. This structure has been proven to have a “multiscale synergistic effect”, allowing the material to maintain strong and stable adhesion to surfaces with changing normal pressures and roughness. Specifically, under a high load, the adhesive strength is 2 times more than that of conventional GIA, and it is 1.5 times stronger on rough surfaces compared to conventional GIA. Under high pressure and high surface roughness simultaneously, the adhesive strength is 3.3 times higher compared to conventional GIA. Our research demonstrates that the synergistic effect of multiscale biomimetic adhesion structures is highly effective in enhancing the adhesive strength of GIA under some harsh contact conditions.

中文翻译：

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受壁虎启发的多尺度协同粘合剂，可在不同的预紧力和表面粗糙度下实现稳定的粘合

受壁虎的启发，纤维状微结构作为工程领域的可控和可逆粘合剂具有广阔的前景。然而，提高壁虎粘合剂（GIA）在复杂的现实接触条件（例如粗糙表面和变化的力场）下的粘合强度和稳定性对于其商业化至关重要，但仍缺乏进一步的研究。在这里，我们提出了一种分层设计的 GIA，其特征是在微妙的多尺度设计下具有硅泡沫 (SF) 背衬层和薄膜端接的纤维微结构。这种结构已被证明具有“多尺度协同效应”，使材料能够在法向压力和粗糙度变化的情况下保持对表面的强大而稳定的附着力。具体来说，在高负载下，粘合强度是传统GIA的2倍，在粗糙表面上的粘合强度是传统GIA的1.5倍。同时在高压和高表面粗糙度的情况下，粘合强度比传统 GIA 高 3.3 倍。我们的研究表明，多尺度仿生粘附结构的协同效应对于增强 GIA 在某些恶劣接触条件下的粘附强度非常有效。