The transition from pH waves to iodine waves in the iodate/sulfite/thiosulfate reaction-diffusion system
The transition from pH waves to iodine waves in the iodate/sulfite/thiosulfate reaction-diffusion system
复制标题
碘酸盐/亚硫酸盐/硫代硫酸盐反应扩散体系中pH波到碘波的转变
DOI：
10.1002/cphc.200800002
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发表时间：
2008-06-02
期刊：
影响因子：
2.9
通讯作者：
Xie, Rongyong
中科院分区：
文献类型：
--
作者：
Gao, Qingyu;Xie, Rongyong
在搅拌和空间扩展介质中研究了碘酸盐/硫代硫酸盐/亚硫酸盐反应的非线性时空行为。根据均匀介质中的时间动态，传播前沿和目标图案都在空间延伸的介质中实现。随着碘酸盐浓度的增加，系统从显示传播前沿演变为圆形波，然后显示目标图案，最后显示碘波。系统研究了亚硫酸盐、硫代硫酸盐和酸的浓度对反应动力学和模式形成的影响，并通过调节这三种物质的浓度实现从pH波到碘波的转变。 pH 波和碘波矿石的传播速度分别通过质子和碘化物的二次和三次自催化来了解。
Nonlinear spatial temporal behavior of the iodate/thiosulfate/sulfite reaction is investigated both in a stirred and spatially extended media. In accord with the temporal dynamics in the homogeneous media, both propagating fronts and target patterns ore achieved in the spatially extended medium. On increasing the iodate concentration the system evolves from exhibiting propagating fronts to circular waves and then shows target patterns and finally the iodine waves. Influences of concentrations of sulfite, thiosulfate and acid on the reaction kinetics and pattern formation are also investigated systematically, and transitions from pH waves to iodine waves con be achieved via adjusting the concentration of the three species. The propagation velocities of pH and iodine waves ore understood with the quadratic and cubic autocatalysis of proton and iodide respectively.