María Antonieta Sánchez-Farrán, Ali Borhan, Ayusman Sen, Vincent H. Crespi
{"title":"A Chemical Mechanism for the Bistable-to-Oscillatory Transition in Colloidal Aggregates of Silver Phosphate","authors":"María Antonieta Sánchez-Farrán, Ali Borhan, Ayusman Sen, Vincent H. Crespi","doi":"10.1002/syst.202400024","DOIUrl":null,"url":null,"abstract":"<p>We previously reported collective behavior in colloidal aggregates of silver phosphate in H<sub>2</sub>O<sub>2</sub> and under UV light. Diffusiophoretic interactions between aggregates lead to non-linear behavior such as oscillations and synchronization, in which oscillation frequencies increase with H<sub>2</sub>O<sub>2</sub> 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<sup>−</sup> 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 <i>π</i> phase shift.</p>","PeriodicalId":72566,"journal":{"name":"ChemSystemsChem","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/syst.202400024","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ChemSystemsChem","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/syst.202400024","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
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.