Liquid-based encapsulation for implantable bioelectronics across broad pH environments.

Area of Science:

• Biomedical Engineering
• Materials Science
• Implantable Devices

Background:

• Wearable and implantable bioelectronics require robust encapsulation for long-term function.
• Existing materials fail in extreme pH environments, limiting applications.
• Encapsulation must balance barrier properties with flexibility and biocompatibility.

Purpose of the Study:

• To develop a novel liquid-based encapsulation for bioelectronics.
• To enable device operation across a wide pH range (acidic to alkaline).
• To ensure flexibility, transparency, and biocompatibility for in vivo applications.

Main Methods:

• A liquid-based encapsulation approach was developed.
• The material's optical transparency, stretchability, and mechanical durability were assessed.
• Encapsulated wireless optoelectronic devices were tested for water resistance in vitro across pH 1.5-9.
• In vivo biocompatibility and long-term device operation were evaluated in mice.

Main Results:

• The liquid-based encapsulation demonstrated high optical transparency, stretchability, and durability.
• Outstanding in vitro water resistance was achieved in extreme acidic (pH 1.5, 4.5) and alkaline (pH 9) conditions.
• The encapsulation proved biocompatible in vivo.
• Encapsulated devices maintained robust operation for 3 months in freely moving mice.

Conclusions:

• The developed liquid-based encapsulation effectively protects bioelectronic devices in extreme pH environments.
• This strategy offers a promising solution for implantable bioelectronics in diverse research and clinical settings.
• The material's properties support extended device functionality and biocompatibility for long-term implantation.