Intrinsically reversible superglues via shape adaptation inspired by snail epiphragm

被引:158
作者
Cho, Hyesung [1 ,2 ]
Wu, Gaoxiang [1 ]
Jolly, Jason Christopher [1 ]
Fortoul, Nicole [3 ,4 ]
He, Zhenping [3 ,4 ]
Gao, Yuchong [1 ]
Jagota, Anand [3 ,4 ]
Yang, Shu [1 ]
机构
[1] Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USA
[2] Korea Inst Sci & Technol, Mat & Life Sci Res Div, Seoul 02792, South Korea
[3] Lehigh Univ, Dept Chem & Biomol Engn, Bethlehem, PA 18105 USA
[4] Lehigh Univ, Dept Bioengn, Bethlehem, PA 18105 USA
基金
新加坡国家研究基金会;
关键词
polymer gels; superstrong adhesion; shape adaptation; intrinsically reversible; snail epiphragm; DRY ADHESIVES; ENHANCED ADHESION; HYDROGELS; SURFACES; ARRAYS;
D O I
10.1073/pnas.1818534116
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];
摘要
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., pressure-sensitive 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 superglue-like 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 similar 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 near-surface structure, providing reversibility and ease of scaling up for practical applications.
引用
收藏
页码:13774 / 13779
页数:6
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