Helical-shaped Self-oscillating Gels showing Autonomous and Magnified Mechanical Oscillation
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Self-oscillating gels have become a distinguished class of smart soft materials because they undergo spontaneous and cyclic swelling-deswelling changes without on-off switching of external stimuli. However, their practical applications of them are still limited due to a small change and non-directional actuation by isotropic deformation. Herein, to improve the degree of deformation, we report an unprecedented method to convert an isotropic deformation into anisotropic and unidirectional deformation of gel. As a result of introducing a three-dimensional periodic gradient structure by photopolymerization into the gel network, a helical-shaped gel could be synthesized. The helical-shaped gels exhibited amplified uniaxial winding and unwinding during the Belousov–Zhabotinsky (BZ) reaction. In addition, they showed a significant change in length compared to the conventional rod-shaped gel. This presentation will discuss synthetic strategy, structure analysis, and improved self-oscillation of helical-shaped gels.