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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spatiotemporal dynamics of mixed landolt systems in open gel reactors: Effect of diffusive feed
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Spatiotemporal dynamics of mixed landolt systems in open gel reactors: Effect of diffusive feed

机译:开式凝胶反应器中混合Landolt系统的时空动力学:扩散进料的影响

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In this report we present an experimental study on the spatiotemporal dynamics of the iodate-sulfite-ferrocyanide and the iodate-sulfite-thiourea systems. Both systems are capable of producing nontrivial reaction-diffusion patterns when they are operated in a one-side-fed open spatial reactor. An important parameter of these types of reactors is the time scale of the diffusive feed, which is determined by the "thickness" of the gel and diffusion coefficients of the chemicals. A conical shape gel is used to study the effect of the thickness gradient on the dynamics. We show that spatiotemporal oscillations stop below a critical thickness. It is demonstrated that the period of the oscillations is determined by the time scale of the inhibitory kinetics and the time scale of the diffusive feed together. In the case of the iodate-sulfite-thiourea system we observed the appearance of a stationary iodine front in the presence of the oscillating pH front. An experimentally supported kinetic explanation is given to account this phenomena.
机译:在这份报告中,我们提出了碘酸盐-亚硫酸盐-亚铁氰化物和碘酸盐-亚硫酸盐-硫脲体系时空动力学的实验研究。当在单侧开放式空间反应器中运行时,这两种系统都能够产生非平凡的反应扩散模式。这些类型的反应器的重要参数是扩散进料的时间标度,该时间标度由凝胶的“厚度”和化学品的扩散系数确定。圆锥形凝胶用于研究厚度梯度对动力学的影响。我们表明时空振荡停止低于临界厚度。已经证明,振荡的周期由抑制动力学的时间尺度和扩散进料的时间尺度共同决定。在碘酸盐-亚硫酸盐-硫脲系统的情况下,我们观察到在振荡的pH峰存在下固定的碘峰的出现。实验支持的动力学解释可以解释这种现象。

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