Core–Shell Nanostructured Assemblies Enable Ultrarobust, Notch-Resistant and Self-Healing Materials
作者：Changchun Li, Xin Yang, Yuyan Wang, Jize Liu,* and Xinxing Zhang*
關鍵字：ore–shell nanostructure, dynamic supramolecular interface, notch-resistant, self-healing, soft actuator
論文來源：期刊
發表時間：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.