Carbon Fiber Superelastic Hydrogel

Microwave-Healable & Visual

With dynamic adaptive reorientation of carbon fibers, this hydrogel maintains superelasticity while greatly enhancing strength and toughness, and uses microwaves for non-contact rapid self-healing with in-situ optical indication when healing is complete.

Song, Liu · Shanshan, Liu · Song, Weidong · Xiao, Lijun · Meng, Yuquan · Li, Yongcun

Chemical Engineering Journal 2026

Specifications

Tensile strength improvement

{'zh': '300', 'en': '300'} %

Toughness improvement

{'zh': '500', 'en': '500'} %

Impact force absorption increase

{'zh': '45', 'en': '45'} %

Healing efficiency

{'zh': '~100', 'en': '~100'} %

Advantages

Simultaneous strength and toughness jump

Short carbon fibers dynamically reorient under load, boosting tensile strength by ~300% and toughness by ~500% while preserving superelasticity and structural recoverability after large deformations.

Microwave non-contact rapid healing

Leveraging the polarization coupling effect between carbon fibers and microwaves, damaged regions are healed intelligently and rapidly; efficiency remains near 100% even after multiple damage-healing cycles, extending service life.

In-situ healing indicator

Upon completion of crack healing, a spark discharge triggered by a localized supercritical electric field serves as an in-situ optical indicator, enabling precise termination of the healing process and preventing over-healing.

Uniform high-loading carbon fiber dispersion

A two-step aqueous dispersion-gel composite strategy uniformly incorporates high-content short carbon fibers into the PVA gel network, overcoming the challenge of uniform dispersion at high loading.

Applications

• Flexible Electronics：As a self-healing flexible circuit substrate that repairs via microwave and self-indicates completion, reducing replacement cost.
• Soft Robotics：As a structural layer for soft robots, combining high strength, impact resistance, and fast self-healing after damage for extended lifetime.
• Wearable Devices：As durable components in wearables that withstand stretching, impacts, and minor damage can be microwave-healed on demand.
• Electronic Skin：As an electronic skin substrate that is flexible, damage-tolerant, self-healing, and provides visual feedback via spark indication during healing.
• Smart Hydrogels：Carbon fibers endow hydrogels with multiple smart functions: mechanical reinforcement, microwave responsiveness, and self-healing indication.