磷酸银胶体聚集体从双稳态到振荡转变的化学机制

IF 3.1 Q2 CHEMISTRY, MULTIDISCIPLINARY ChemSystemsChem Pub Date : 2024-06-18 DOI:10.1002/syst.202400024
María Antonieta Sánchez-Farrán, Ali Borhan, Ayusman Sen, Vincent H. Crespi
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引用次数: 0

摘要

我们以前曾报道过磷酸银胶体聚集体在 H2O2 和紫外线照射下的集体行为。聚集体之间的扩散性相互作用导致了振荡和同步等非线性行为,其中振荡频率随 H2O2 浓度的增加而增加。聚集体在游动和分散行为之间过渡,并具有初步的时空相关性。我们确定了一个动力学模型,该模型映射了被认为是胶体聚集体非线性现象基础的化学物种,即吸附氧物种 *OOH- 和 *O。我们研究了最简单情况下的突发动力学,即两个原本双稳态团簇的耦合。我们提出了两种耦合方案,并发现--取决于耦合是兴奋性的还是抑制性的--团簇可能以零或 π 相移的方式振荡。
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A Chemical Mechanism for the Bistable-to-Oscillatory Transition in Colloidal Aggregates of Silver Phosphate

We previously reported collective behavior in colloidal aggregates of silver phosphate in H2O2 and under UV light. Diffusiophoretic interactions between aggregates lead to non-linear behavior such as oscillations and synchronization, in which oscillation frequencies increase with H2O2 concentration. The aggregates transition between schooling and dispersed behaviors with incipient spatiotemporal correlations. We identified a kinetic model that maps the chemical species that are thought to underlie non-linear phenomena in the colloidal aggregates, i. e. adsorbed oxygen species *OOH and *O. We investigate the emergent dynamics for the simplest case, the coupling of two otherwise bistable clusters. Two coupling schemes are proposed and we find that – depending on whether the coupling is excitatory or inhibitory – the clusters may oscillate with zero or π phase shift.

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