A Chemical Mechanism for the Bistable-to-Oscillatory Transition in Colloidal Aggregates of Silver Phosphate

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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Abstract

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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磷酸银胶体聚集体从双稳态到振荡转变的化学机制
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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