Reversibly Sticking Metals and Graphite to Hydrogels and Tissues

Wenhao Xu ¹, Faraz A Burni ², Srinivasa R Raghavan ^1,2

⁰Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States.

Acs Central Science +

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April 1, 2024

View abstract on PubMed

Summary

Scientists discovered hard-soft electroadhesion (EA[HS]), a method to bond electrical conductors to soft materials using a low electric field. This novel adhesion technique creates durable bonds without adhesives, opening new possibilities for material science.

Area Of Science

Materials Science
Electrochemistry
Polymer Science

Background

Traditional adhesives face limitations with soft, aqueous materials like hydrogels and biological tissues.
Developing novel bonding methods is crucial for advanced material applications.

Purpose Of The Study

To introduce and characterize a new adhesion phenomenon: hard-soft electroadhesion (EA[HS]).
To demonstrate the mechanism and potential applications of EA[HS].

Main Methods

Applying a low DC electric field to adhere hard electrical conductors (metals, graphite) to soft aqueous materials (hydrogels, fruit, tissue).
Investigating adhesion at anode/cathode, reversibility, and electrochemical series dependence.
Analyzing the electrochemical reactions responsible for bond formation.

Main Results

A strong, enduring adhesion (EA[HS]) is formed between conductors and soft materials using a DC electric field.
Adhesion occurs at specific electrodes (anode, cathode, or both) and can be reversed by polarity change.
EA[HS] formation is linked to electrochemical reactions creating chemical bonds, following specific electrochemical series.
Successful adhesion was demonstrated even underwater.

Conclusions

Hard-soft electroadhesion (EA[HS]) provides a novel, adhesive-free method for bonding dissimilar materials.
EA[HS] relies on electrochemically induced chemical bonding, offering tunable and reversible adhesion.
This technique has significant potential for creating hybrid materials in robotics, energy storage, and biomedical fields.