活性脉动凝胶：从化学微反应器到聚合物致动器
Active pulsatile gels: from chemical microreactor to polymeric actuator
AI总结：
本文提出两步合成活性BZ水凝胶，优化几何与化学机械性能，发现振荡幅度受溶胀时间限制，实验与理论模型吻合。
摘要：
我们报道了一种活性脉动Belousov-Zhabotinsky（BZ）水凝胶的合成方案、实验表征和理论建模。我们的两步合成技术能够独立优化BZ凝胶的几何、化学和力学性能。我们确定了周围介质化学性质和凝胶半径对BZ凝胶振荡发生的作用，并通过Damkohler数（化学反应与扩散速率之比）进行量化。通过调节BZ凝胶尺寸以最大化其化学机械振荡幅度，我们发现其振荡应变幅度受限于凝胶溶胀时间尺度与化学振荡周期的相对关系。我们的实验结果与Vanag-Epstein BZ化学模型和Tanaka-Fillmore凝胶溶胀动力学理论高度吻合。
英文摘要：
We report on a synthesis protocol, experimental characterization and theoretical modeling of active pulsatile Belousov-Zhabotinsky (BZ) hydrogels. Our two-step synthesis technique allows independent optimization of the geometry, the chemical, and the mechanical properties of BZ gels. We identify the role of the surrounding medium chemistry and gel radius for the occurrence of BZ gel oscillations, quantified by the Damkohler number, ratio of chemical reaction to diffusion rates. Tuning the BZ gel size to maximize its chemomechanical oscillation amplitude, we find that its oscillatory strain amplitude is limited by the timescale of gel swelling relative to the chemical oscillation period. Our experimental findings are in good agreement with a Vanag-Epstein model of BZ chemistry and a Tanaka Fillmore theory of gel swelling dynamics.
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