作者：Changchun Li, Xin Yang, Yuyan Wang, Jize Liu,* and Xinxing Zhang*
关键字：ore–shell nanostructure, dynamic supramolecular interface, notch-resistant, self-healing, soft actuator
论文来源：期刊
发表时间：2024年

Actuators based on stimulus-responsive soft materials have attracted

widespread attention due to their signi?cant advantages in ?exibility and

structural adaptability over traditional rigid actuators. However, the

development of fast-actuating, mechanical robust and self-healing actuators

without compromising ?exibility remains an ongoing challenge. Here, this

study presents a photo-responsive ?exible actuator by incorporating

core–shell liquid metal nano-assemblies into a polyurethane matrix to

construct a dynamic supramolecular interface. The nano-assemblies are

endowed with adaptive characteristics to external loading, being expected to

dissipate energy via the reversible reconstruction of hydrogen bonding and

deformation of nano-assemblies. The obtained composites exhibit excellent

mechanical strength (31 MPa), low modulus (2.02 MPa), high stretchability

(1563.95%), autonomous self-healing (92.5%), and NIR-responsive actuation

properties. Furthermore, the combination of high cohesive energy but ?uxible

nano-liquid metal core, and strong dynamic interface not only achieves the

balance of high tensile strength and high ?exibility but also endows the

actuators with outstanding notch-resistant performance (fracture

energy≈58.8 kJ m?2)through multiphase energy dissipation. This work

provides a promising strategy for developing soft yet tough self-healing

materials in the ?elds of ?exible robotics and arti?cial muscles.