Design of a comb-type self-oscillating gel.

Here we show a comb-type self-oscillating gel that exhibits spontaneous swelling-deswelling oscillation without on-off switching of external stimuli. The redox oscillation of the polymerized catalyst of the BZ reaction is converted to mechanical oscillation of the polymer. By introducing grafted polymer chains, self-oscillation with faster and larger swelling-deswelling changes was achieved.