2017
DOI: 10.1002/chem.201700725
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Photo‐Controlled Waves and Active Locomotion

Abstract: Waves of chemical concentration, created by the interaction between reaction and diffusion, occur in a number of chemical systems far from equilibrium. In appropriately chosen polymer gels, these waves generate mechanical forces, which can result in locomotion. When a component of the system is photosensitive, light can be used to modulate and control these waves. In this Concept article, we examine various forms of photo-control of such systems, focusing particularly on the Belousov-Zhabotinsky oscillating ch… Show more

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Cited by 7 publications
(4 citation statements)
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“…With minor modifications, our model might be applicable to other systems. We highlight photosensitive self-oscillating gels where the swelling is regulated by an embedded, lightsensitive chemical reaction [52][53][54][55]. Applying appropriate illumination pattern generates directed waves of a regulator which lead to oscillatory motion of the gel with [52] and without [54] net motion.…”
Section: Discussionmentioning
confidence: 99%
“…With minor modifications, our model might be applicable to other systems. We highlight photosensitive self-oscillating gels where the swelling is regulated by an embedded, lightsensitive chemical reaction [52][53][54][55]. Applying appropriate illumination pattern generates directed waves of a regulator which lead to oscillatory motion of the gel with [52] and without [54] net motion.…”
Section: Discussionmentioning
confidence: 99%
“…61 A colloidal wave, on the other hand, occurs at an intermediated scale with discrete, visible entities. Moreover, most studies of manipulating BZ patterns have focused on their propagation in space, 49,51,62 whereas we have achieved both spatial and temporal control of colloidal waves by taking advantage of their response to switching the light off.…”
Section: Discussionmentioning
confidence: 99%
“…Pioneering studies of the spatiotemporal control of BZ waves offer inspiration for controlling colloidal waves. Examples include the use of spatial confinement, programmed chemical gradients, electrical potential, , temperature gradient, audible sound, and light. Among these strategies to regulate waves, light confers advantages of spatiotemporal tunability and flexibility. For example, the Showalter group reported a light-controlled feedback method to produce complex wave trajectories in a photosensitive BZ system.…”
mentioning
confidence: 99%
“…Different modes of motion driven by periodic deformation waves are not restricted to Physarum MP, but are also found in rather general mathematical models [25] and in the locomotion of a wide variety of limbless and legged animals [26]. More recently, different modes have also been found in the Belousov-Zhabotinsky reaction in a light-driven photosensitive gel [2730]; Epstein and coworkers have classified the modes using the terms retrograde and direct wave locomotion [28] and also report on a form of oscillatory migration without net displacement of the average position [29].…”
Section: Introductionmentioning
confidence: 99%