{"title":"Liquid structure of quaternary-ammonium ionic liquids-propanol mixtures as CO2 absorber: Role of fluctuation","authors":"Fumiya Nemoto , Shusei Maruyama , Kazutaka Ikeda , Hidetoshi Ohshita , Toshiya Otomo , Hiroshi Abe","doi":"10.1016/j.cplett.2025.142047","DOIUrl":null,"url":null,"abstract":"<div><div>In the mixtures of ionic liquids, consisting of R-N,N,N-trimethylammonium (R <span><math><mo>=</mo></math></span> N- propyl, N-butyl, N-hexyl) or N, N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cations and bis(trifluoromethanesulfonyl)imide (TFSI) anions with 1/2-propanol, N-butyltrimethylammonium TFSI - 2-Propanol mixture can store up to 25% CO<sub>2</sub> by mole fraction under ambient conditions. In this study, the liquid structure of these systems was analyzed using small- and wide-angle X-ray scattering and neutron diffraction measurements in both air and CO<sub>2</sub> environment. As a result, the local structures rarely changed, while the size of concentration fluctuation and the free volume, which can store CO<sub>2</sub>, grew near the critical points.</div></div>","PeriodicalId":273,"journal":{"name":"Chemical Physics Letters","volume":"868 ","pages":"Article 142047"},"PeriodicalIF":3.1000,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Physics Letters","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0009261425001873","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/28 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In the mixtures of ionic liquids, consisting of R-N,N,N-trimethylammonium (R N- propyl, N-butyl, N-hexyl) or N, N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium cations and bis(trifluoromethanesulfonyl)imide (TFSI) anions with 1/2-propanol, N-butyltrimethylammonium TFSI - 2-Propanol mixture can store up to 25% CO2 by mole fraction under ambient conditions. In this study, the liquid structure of these systems was analyzed using small- and wide-angle X-ray scattering and neutron diffraction measurements in both air and CO2 environment. As a result, the local structures rarely changed, while the size of concentration fluctuation and the free volume, which can store CO2, grew near the critical points.
期刊介绍：
Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage.
Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.
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