Intrinsically reversible superglues via shape adaptation inspired by snail epiphragm
- Intrinsically reversible superglues via shape adaptation inspired by snail epiphragm
- 조혜성; Gaoxiang Wu; Jason Christopher Jolly; Nicole Fortoul; Zhenping He; Yuchong Gao; Anand Jagota; Shu Yang
- Issue Date
- Proceedings of the National Academy of Sciences of the United States of America
- VOL 116, NO 28-13779
- Adhesives are ubiquitous in daily life and industrial applications. They usually fall into one of two classes: strong but irreversible (e.g., superglues) or reversible/reusable but weak (e.g., pressuresensitive adhesives and biological and biomimetic surfaces). Achieving both superstrong adhesion and reversibility has been challenging. This task is particularly difficult for hydrogels that, because their major constituent is liquid water, typically do not adhere strongly to any material. Here, we report a snail epiphragm-inspired adhesion mechanism where a polymer gel system demonstrates supergluelike adhesion strength (up to 892 N·cm− 2) that is also reversible. It is applicable to both flat and rough target surfaces. In its hydrated state, the softened gel conformally adapts to the target surface by low-energy deformation, which is locked upon drying as the elastic modulus is raised from hundreds of kilopascals to ∼2.3 GPa, analogous to the action of the epiphragm of snails. We show that in this system adhesion strength is based on the material’s intrinsic, especially near-surface, properties and not on any nearsurface structure, providing reversibility and ease of scaling up for practical applications.
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