Bioinspired H-Bonding Connected Gradient Nanostructure Actuators Based on Cellulose Nano?brils and Graphene
作者：Zhangqin Yang, Yuting Wang, Lidan Lan, Yuyan Wang,* and Xinxing Zhang*
關鍵字：cellulose nano?brils, gradient nanostructure, graphene, hygroscopic actu- ators, interlayer H-bonding
論文來源：期刊
發表時間：2024年
The construction of ?exible actuators with ultra-fast actuation and robust
mechanical properties is crucial for soft robotics and smart devices, but still
remains a challenge. Inspired by the unique mechanism of pinecones
dispersing seeds in nature, a hygroscopic actuator with interlayer
network-bonding connected gradient structure is fabricated. Unlike most
conventional bilayer actuator designs, the strategy leverages biobased
polyphenols to construct strong interfacial H-bonding networks between 1D
cellulose nano?bers and 2D graphene oxide, endowing the materials with
high tensile strength (172 MPa) and excellent toughness (6.64 MJ m?3).
Furthermore, the signi?cant di?erence in hydrophilicity between GO and rGO,
along with the dense interlayer H-bonding, enables ultra-fast water exchange
during water absorption and desorption processes. The resulted actuator
exhibits ultra-fast driving speed (154° s?1), excellent pressure-resistant and
cyclic stability. Taking advantages of these bene?ts, the actuator can be
fabricated into smart devices (such as smart grippers, humidity control
switches) with signi?cant potential for practical applications. The presented
approach to constructing interlayer H-bonding in gradient structures is
instructive for achieving high performance and functionalization of biomass
nanomaterials and the complex of 1D/2D nanomaterials.