Anti-Swelling Antibacterial Hydrogels Based on Electrostatic Repulsion and Hydrophobic Interactions for Human Motion...

Area of Science:

• Materials Science
• Bioelectronics
• Polymer Chemistry

Background:

• Conductive hydrogels are crucial for bioelectronic sensors due to their flexibility.
• Traditional hydrogels face limitations like excessive swelling and poor antibacterial activity.
• Developing advanced sensing materials is key for progress in bioelectronics.

Purpose of the Study:

• To engineer anti-swelling, antibacterial, and ionically conductive hydrogels.
• To overcome the limitations of conventional conductive hydrogels for biomedical applications.
• To create a flexible material suitable for wearable sensors and physiological monitoring.

Main Methods:

• Free radical polymerization was employed to synthesize the hydrogels.
• A monomer mixture including acrylic acid (AA), [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA), and lauryl methacrylate (LMA) was used.
• The anti-swelling mechanism involves electrostatic repulsion from protonated SBMA and hydrophobic LMA.

Main Results:

• The hydrogel demonstrated excellent anti-swelling properties (59.36% swelling ratio after 120h).
• Achieved good mechanical performance: 158 kPa tensile strength, 176% elongation at break, 0.37 MPa compressive strength.
• Exhibited superior strain sensing with a gauge factor of 1.315, 330 ms response, and 177 ms recovery times.
• Successfully monitored human motion and physiological signals.

Conclusions:

• The developed hydrogel offers a promising solution for anti-swelling and antibacterial requirements in bioelectronics.
• Its enhanced mechanical and sensing properties make it ideal for wearable sensors and biomedical monitoring.
• This material advancement contributes to the development of next-generation bioelectronic devices.