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Based on aqueous salt solution droplets, we investigate nanopore\u2010driven ion transport control for tailorable droplet communication\n                    <jats:italic>via<\/jats:italic>\n                    a mesoporous surface. Droplets were placed on a mesoporous silica thin film, separated by a polyelectrolyte (PEL)\u00a0barrier. The PEL\u2010barrier was\u00a0incorporated into the mesoporous matrix by automated direct\u2010laser\u2010writing and a grafting\u2010from SI\u2010PET\u2010RAFT polymerization. Permselective transport\u2010regulated barrier breakthrough times were used to compare aqueous BaCl\n                    <jats:sub>2<\/jats:sub>\n                    , MgSO\n                    <jats:sub>4<\/jats:sub>\n                    , MgCl\n                    <jats:sub>2<\/jats:sub>\n                    , and NaCl solutions. By tuning the barrier widths, the full range of the polyelectrolyte barrier functions from ion\u2010selective flow regulation to complete fluid retention becomes attainable. Ion\u2010specific barrier interactions lead to characteristic imbibition dynamics beyond the barrier, involving advancing imbibition toward a steady state in the case of favored barrier permeation, or hindered and oscillating imbibition in the case of disfavored barrier permeation. The ionic selectivity further allows the emergence of control of chemical events such as precipitation reactions in nanopores by the spatial localization of droplets according to the barrier site. The insights into polyelectrolyte\u2010regulated ion transport during imbibition processes bring new tools for the development of compartmentalized and reconfigurable communication between distant fluid reservoirs through nanostructured coatings.\n                  <\/jats:p>","DOI":"10.1002\/smsc.70352","type":"journal-article","created":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T18:55:19Z","timestamp":1785351319000},"source":"Crossref","is-referenced-by-count":0,"title":["Programmable Inter\u2010Droplet Communication by Polymer\u2010Gated Ion Transport Through Nanopore Lattices"],"prefix":"10.1002","volume":"6","author":[{"given":"Marius","family":"Kirsch","sequence":"first","affiliation":[{"name":"Ernst\u2010Berl Institut f\u00fcr Technische und Makromolekulare Chemie Technische Universit\u00e4t Darmstadt  Darmstadt Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4789-4710","authenticated-orcid":false,"given":"Agustin D.","family":"Pizarro","sequence":"additional","affiliation":[{"name":"Instituto de Nanosistemas Escuela de Bio y Nanotecnolog\u00edas (INS\u2010EByN\u2010UNSAM\u2010CONICET)  San Mart\u00edn Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mart\u00edn G.","family":"Bellino","sequence":"additional","affiliation":[{"name":"Instituto de Nanociencia y Nanotecnolog\u00eda (CNEA\u2010CONICET)  San Mart\u00edn Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9984-3806","authenticated-orcid":false,"given":"Galo J. 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