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In particular we show that particles carrying strongly anionic surface coatings composed of DNA or phospholipid bilayers display long-range attraction. We further find that the length scale governing the decay of the attractive force can depend on the properties of the interacting particles. This contrasts with the canonical expectation that the screening length governing the interaction of charged particles in solution depends exclusively on the properties of the intervening electrolyte medium. The observations point to significant departures from current thinking, and the likely need for a model of interactions that accounts for the molecular nature of the solvent, its interfacial behaviour, and spatial correlations. Finally, a strong and long-ranged attraction mediated by anionic matter constituting lipid membranes and chromatin could carry far-reaching implications for organization and structure formation in biology.<\/jats:p>","DOI":"10.1088\/1361-6633\/ae3fca","type":"journal-article","created":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T22:50:37Z","timestamp":1769813437000},"page":"028101","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Direct measurement of the attractive electrosolvation force between a pair of colloidal particles"],"prefix":"10.1088","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6069-6765","authenticated-orcid":true,"given":"Sida","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angela","family":"Le","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rowan","family":"Walker-Gibbons","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1274-7155","authenticated-orcid":true,"given":"Madhavi","family":"Krishnan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,2,20]]},"reference":[{"key":"ropae3fcabib1","first-page":"30","type":"journal-article","volume":"14","author":"Derjaguin","year":"1941","journal-title":"Acta Physicochim."},{"key":"ropae3fcabib2","author":"Verwey","year":"1948","type":"book"},{"key":"ropae3fcabib3","doi-asserted-by":"publisher","first-page":"873","DOI":"10.1063\/1.1750183","type":"journal-article","volume":"6","author":"Langmuir","year":"1938","journal-title":"J. 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