Photophobic and phototropic movement of a self-oscillating gel

A photosensitive self-oscillating gel that incorporates the Belousov-Zhabotinsky reaction can undergo rhythmic mechanical oscillations. Irving Epstein discusses the dependence of the oscillation frequency on light intensity to generate both photophobic and phototropic movement of the gel under differential illumination

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Image courtesy of interviewee. December 1, 2021

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