Sweat-Resistant Silk Fibroin-Based Double Network Hydrogel Adhesives

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Wearable Technology

Background:

• Stable adhesion of epidermal sensors is crucial for reliable functionality.
• Achieving durable skin adhesion for electronic devices, especially in humid or sweaty environments, remains a significant challenge.

Purpose of the Study:

• To develop a novel hydrogel adhesive with enhanced biocompatibility and adhesion properties for epidermal sensors.
• To investigate the potential of a silk fibroin-polyacrylamide (SF-PAAm) double network (DN) hydrogel for robust skin attachment.

Main Methods:

• Fabrication of a silk fibroin-polyacrylamide (SF-PAAm) double network (DN) hydrogel.
• Evaluation of the hydrogel's biocompatibility, adhesion strength, and durability on wet skin surfaces.
• Integration of the hydrogel adhesive with epidermal sensor arrays for on-body testing.

Main Results:

• The SF-PAAm DN hydrogel exhibits excellent biocompatibility and strong, durable adhesion on wet skin.
• The hydrogel's tunable properties and improved water retention ensure consistent adhesion across varying humidity levels.
• Successful integration with sensor arrays demonstrated effective real-time on-body sweat sensing.

Conclusions:

• The SF-PAAm DN hydrogel adhesive offers a promising solution for reliable epidermal sensor attachment.
• This material demonstrates significant potential for applications in epidermal healthcare sensors and medical adhesives.