Ultrarobust Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene-Based Soft Actuators <i>via</i> Bamboo-Inspired Mesoscale Assembly of Hybrid Nanostructures.
basic_science · Level V
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- Record sourced from PubMed, PMID 32441915.
- Also identified by DOI 10.1021/acsnano.0c01779.
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Abstract
Soft actuation materials are highly desirable in flexible electronics, soft robotics, <i>etc</i>. However, traditional bilayered actuators usually suffer from poor mechanical properties as well as deteriorated performance reliability. Here, inspired by the delicate architecture of natural bamboo, we present a hierarchical gradient structured soft actuator <i>via</i> mesoscale assembly of micro-nano-scaled two-dimentional MXenes and one-dimentional cellulose nanofibers with molecular-scaled strong hydrogen bonding. The resultant actuator integrates high tensile strength (237.1 MPa), high Young's modulus (8.5 GPa), superior toughness (10.9 MJ/m<sup>3</sup>), and direct and fast hygroscopic actuation within a single body, which is difficult to achieve by traditional bilayered actuators. The proof-of-concept prototype robot is demonstrated to emphasize its high mechanical robustness even after bending 100 000 times, kneading, or being trampled by an adult (7 500 000 times heavier than a crawling robot). This bioinspired mesoscale assembly strategy provides an approach for soft materials to the application of next-generation robust robotics.