Volume 60, Issue 16 pp. 8948-8959
Research Article

A Superstrong and Reversible Ionic Crystal-Based Adhesive Inspired by Ice Adhesion

Lili Liu

Lili Liu

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

These authors contributed equally to this work.

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Ziyang Liu

Ziyang Liu

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

These authors contributed equally to this work.

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Yongyuan Ren

Yongyuan Ren

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

These authors contributed equally to this work.

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Xiuyang Zou

Xiuyang Zou

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

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Wansu Peng

Wansu Peng

School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Weizheng Li

Weizheng Li

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

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Yiqing Wu

Yiqing Wu

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

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Sijie Zheng

Sijie Zheng

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

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Prof. Dr. Xiaoliang Wang

Corresponding Author

Prof. Dr. Xiaoliang Wang

School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 China

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Prof. Dr. Feng Yan

Corresponding Author

Prof. Dr. Feng Yan

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 China

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First published: 02 February 2021
Citations: 124

Graphical Abstract

Inspired by reversible ice adhesion, a reversible ionic crystal (IC) based gel adhesive was prepared, which showed superstrong and reversible adhesion due to the phase transition of ICs. In addition, the reversible adhesion can be adjusted by heating and light, and be effectively monitored by resistance and capacitance.

Abstract

In this study, we developed a superstrong and reversible adhesive, which can possess a high bonding strength in the “adhesive” state and detach with the application of heating. An ionic crystal (IC) gel, in which an IC was immobilized within a soft-polymer matrix, were synthesized via in situ photo-crosslinking of a precursor solution composed of N, N-dimethyl acrylamide (DMAA) and a melted IC. The obtained IC gel is homogenous and transparent at melt point. When cooled to the phase transition temperature of the IC, the gel turns into the adhesive with the adhesion strength of 5.82 MPa (on glasses), due to the excellent wetting of melted gel and a thin layer of crystalline IC with high cohesive strength formed on the substrates. The synergistic effects between IC, polymer networks and substrates were investigated by solid state 1H NMR and molecular dynamics simulation. Such an adhesive layer is reversable and can be detached by heating and subsequent re-adhesion via cooling. This study proposed the new design of removable adhesives, which can be used in dynamic and complex environments.

Conflict of interest

The authors declare no conflict of interest.

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