Helical-shaped Self-oscillating Gels showing Autonomous and Magnified Mechanical Oscillation
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내용
Self-oscillating gels have become smart soft materials because they undergo spontaneous swelling-deswelling changes without on-off switching of external stimuli. However, the practical applications of them are still limited due to a small change and non-directional actuation by isotropic deformation. Herein, 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. They 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. When the gel is floated on the water surface, it reciprocated at a constant speed. This presentation will discuss synthetic strategy, structure analysis, and self-oscillation of helical-shaped gels.