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This enhancement was hypothesized to arise from convection that results from a localized increase in current density. Here, we use time-resolved microscopy to track gold microstructures migrating toward the triple point and to elucidate how electrolyte identity and concentration influence electrolysis-induced convection around a fluid insulating droplet fouling an electrode. By fitting a logistic model on the microscopy data, the maximum particle assembly rate (\u03b1) and saturation level (K) were estimated from aqueous samples that contained HAuCl4\u2013Na2SO4, HAuCl4\u2013K2SO4, and HAuCl4\u2013CH3COONa. The \u03b1 and K values were comparable in samples that were electrolyzed in 75\u2013300 mM Na2SO4. However, the particle assembly parameters generally decreased in 600 mM Na2SO4 due to a less dispersed electric double layer and higher bulk solution viscosity. In terms of the effect of the electrolyte species, both \u03b1 and K were remarkably lower in the acetate-containing samples than in the sulfate-containing samples. This phenomenon could be explained by pH effect, capping effect, and, more importantly, specific ion effects represented by the Hofmeister series. In the series, CH3COO\u2013 lies at the borderline of chaotropicity. For this reason, it tends to destabilize the growth or agglomeration of gold particles. The findings in this manuscript are useful for micropatterning in various devices and the emerging field of electrolyte engineering.<\/jats:p>","DOI":"10.1021\/cbmi.5c00287","type":"journal-article","created":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T02:08:20Z","timestamp":1774922900000},"page":"2032-2040","source":"Crossref","is-referenced-by-count":0,"title":["Vortex-Force-Driven\nParticle Assembly around Electrode-Fouling\nInsulating Oil Droplets Is Influenced by Electrolyte Composition"],"prefix":"10.1021","volume":"4","author":[{"given":"Harry Morris","family":"Rodriguez","sequence":"first","affiliation":[{"name":"Curtin University , , , ,","place":["Bentley, Western Australia, Australia, 6102"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8272-8454","authenticated-orcid":true,"given":"Simone","family":"Ciampi","sequence":"additional","affiliation":[{"name":"Curtin University , , , ,","place":["Bentley, Western Australia, Australia, 6102"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,3,30]]},"reference":[{"issue":"1","key":"2026092808071285500_cit1","doi-asserted-by":"publisher","DOI":"10.1002\/celc.202101088","article-title":"A Systematic Study of the Influence\nof Electrolyte Ions on the Electrode Activity","volume":"9","author":"Ding","year":"2022","journal-title":"ChemElectroChem"},{"issue":"7","key":"2026092808071285500_cit2","doi-asserted-by":"publisher","DOI":"10.1002\/smsc.202400042","article-title":"The Electrocatalytic\nActivity of Au Electrodes Changes Significantly in Various Na+\/K+\nSupporting Electrolyte Mixtures","volume":"4","author":"Sarpey","year":"2024","journal-title":"Small Sci."},{"issue":"1","key":"2026092808071285500_cit3","doi-asserted-by":"publisher","first-page":"14","DOI":"10.1039\/D1SC04775B","article-title":"Improving the intrinsic\nactivity of electrocatalysts for sustainable energy conversion: where\nare we and where can we go?","volume":"13","author":"Govindarajan","year":"2021","journal-title":"Chem. 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