{"title":"The length-scale dependence of diffusion in a room temperature ionic liquid: insight into the effect of spatial heterogeneity","authors":"Emily D. Simonis, G. J. Blanchard","doi":"10.1007/s10008-025-06253-w","DOIUrl":null,"url":null,"abstract":"<div><p>We have examined the translational diffusion of the polar chromophore Rhodamine B (RB) in the room temperature ionic liquid 1-butyl-3-methylimidazolum bis(trifluoromethylsulfonyl)imide (BMIM TFSI) using fluorescence recovery after photobleaching (FRAP) as a function of the length scale of chromophore diffusional motion. Our data show that the diffusion constants recovered from the measurements appear to depend on the size of the photobleached region, consistent with anomalous super-diffusion in a regime suggestive of quasi-ballistic motion. The functional form of the diffusion constant spot-size dependence can be accounted for in the context of partitioning of a relatively small fraction of the diffusing chromophores into low viscosity domains at any given time, which relies on local compositional heterogeneity in the ionic liquid.</p></div>","PeriodicalId":665,"journal":{"name":"Journal of Solid State Electrochemistry","volume":"29 2024","pages":"2189 - 2194"},"PeriodicalIF":2.6000,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Solid State Electrochemistry","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10008-025-06253-w","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 0
Abstract
We have examined the translational diffusion of the polar chromophore Rhodamine B (RB) in the room temperature ionic liquid 1-butyl-3-methylimidazolum bis(trifluoromethylsulfonyl)imide (BMIM TFSI) using fluorescence recovery after photobleaching (FRAP) as a function of the length scale of chromophore diffusional motion. Our data show that the diffusion constants recovered from the measurements appear to depend on the size of the photobleached region, consistent with anomalous super-diffusion in a regime suggestive of quasi-ballistic motion. The functional form of the diffusion constant spot-size dependence can be accounted for in the context of partitioning of a relatively small fraction of the diffusing chromophores into low viscosity domains at any given time, which relies on local compositional heterogeneity in the ionic liquid.
期刊介绍：
The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry.
The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces.
The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis.
The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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