Actuators are very sensitive to changes in the surrounding environment and can convert external stimuli into visible deformations through rapid, reversible, and controllable shape changes, which have been shown in fields such as wearable devices, electronic skins, and microrobots. Huge application potential. In view of the fact that graphene oxide can achieve rapid adsorption and ultra-fast transport of water molecules, in recent years, researchers have continued to use graphene oxide as an active material layer and couple it with another inert material layer for water molecules to prepare humidity-responsive actuators. Under humidity stimulation, the selective adsorption of water molecules will produce stress mismatch at the interface of the double-layer material, causing the overall film to deform. However, in most cases, such double-layer actuators suffer from insufficient interlayer adhesion during frequent deformation, which brings huge obstacles to their practical application.
Recently, the team of Dr. Han Dongdong and Professor Zhang Yonglai of Jilin University and Professor Sun Hongbo of Tsinghua University were inspired by the quantum confinement fluid effect of natural biological organisms. They prepared a graphene oxide film with a one-sided periodic stripe structure and introduced anisotropic Anisotropic quantum confinement fluid channels enable the preparation of humidity-responsive graphene oxide films without coupling other materials. The graphene oxide film has the characteristics of short response time, large deformation and controllable deformation when stimulated by humidity environment. It can be used in the design and preparation of bionic robots, such as centipedes that are stimulated by humidity (Figure 1) and bionics that capture ladybugs. leaves (Fig. 2).
Figure 1. Humidity stimulates the crawling graphene oxide centipede
Figure 2. Humidity stimulates the graphene oxide leaf to capture the ladybug
This article was published in Advanced Materials, the first author is Professor Zhang Yonglai.
Original text (scan or long press the QR code to identify and go directly to the original text page):
Quantum‐Confined‐Superfluidics‐Enabled Moisture Actuation Based on Unilaterally Structured Graphene Oxide Papers
Yong‐Lai Zhang, Yu‐Qing Liu, Dong‐Dong Han, Jia‐Nan Ma, Dan Wang, Xian‐Bin Li, Hong‐Bo Sun
Adv. Mater., 2019, 31, 1901585, DOI: 10.1002/adma.201901585
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