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Here, we introduce smart, injectable soft materials based on CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2011triggered hydrogels integrated with tailored deep eutectic solvents (DESs) to boost sequestration. The hydrogel forms upon CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2011triggered protonation of erucamine (a C\n                    <jats:sub>22<\/jats:sub>\n                    \u2011tailed tertiary amine) within its aqueous dispersion, which promotes electrostatic interactions and hydrophobic self\u2011assembly. The DESs (choline chloride\/polyethylene glycol\u2011200\/boric acid) further enhance system functionality. In situ gelation and flow behavior of these soft materials is validated via visualization and rheology under simulated reservoir conditions (45\u00b0C, 10\u00a0MPa, 4500 mg\u00b7L\n                    <jats:sup>\u22121<\/jats:sup>\n                    NaCl). Sequestration assays reveal that a 3.0 wt% erucamine\u2010based hydrogel increases CO\n                    <jats:sub>2<\/jats:sub>\n                    storage by 31.8% relative to brine; incorporation of 5.0\u00a0wt% DESs to form a hybrid hydrogel further elevates storage to 52.9%. Notably, the hydrogel retains structural integrity with no detectable CO\n                    <jats:sub>2<\/jats:sub>\n                    leakage throughout a 146\u2011day monitoring period at 45\u00a0\u00b0C. The improved CO\n                    <jats:sub>2<\/jats:sub>\n                    sequestration stems from three synergistic mechanisms: erucamine\u2010CO\n                    <jats:sub>2<\/jats:sub>\n                    reaction, hydrogel physical entrapment, and DESs\u2010promoted solubility. This work establishes a quantifiable and scalable soft material platform that offers a transformative route for advancing CO\n                    <jats:sub>2<\/jats:sub>\n                    sequestration in saline aquifers.\n                  <\/jats:p>","DOI":"10.1002\/advs.77958","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T18:00:31Z","timestamp":1790532031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["In Situ CO\n                    <sub>2<\/sub>\n                    \u2010Induced Hydrogels for Enhancing Carbon Sequestration in Saline Aquifers"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4170-0006","authenticated-orcid":false,"given":"Fuchuan","family":"Liu","sequence":"first","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5015-8760","authenticated-orcid":false,"given":"Xinjie","family":"Luo","sequence":"additional","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8755-373X","authenticated-orcid":false,"given":"Dianguo","family":"Wu","sequence":"additional","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-4968-9103","authenticated-orcid":false,"given":"Xuezhi","family":"Zhao","sequence":"additional","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-8406-8023","authenticated-orcid":false,"given":"Yan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5046-6085","authenticated-orcid":false,"given":"Yujun","family":"Feng","sequence":"additional","affiliation":[{"name":"Polymer Research Institute, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,27]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gsf.2025.102177"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41558\u2010024\u201002104\u20100"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tej.2021.107004"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijggc.2021.103318"},{"key":"e_1_2_9_6_1","unstructured":"IEA (2024) It Is Time for CCUS to Deliver Paris https:\/\/www.iea.org\/commentaries\/it\u2010is\u2010time\u2010for\u2010ccus\u2010to\u2010deliver Licence: CC BY 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