Investigation of CO2 sorption characteristics of imidazolium ionic liquid crystals

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-09-28 DOI:10.1016/j.molliq.2025.128524

Grace E.B. Redwine , Nicholas Strange , Cullen Quine , Noemi Leick , Thomas Gennett

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引用次数: 0

Abstract

This work is focused on advancing of the understanding the carbon dioxide (CO₂) sorption characteristics of imidazolium ionic liquid crystals based on the 1-alkyl-3-methylimidazolium (C_nmim) ionic liquid family. Specifically, the mechanism of sorption across the melting, liquid crystal, and isotropic liquid transitions is investigated for 1-tetradecyl-3-methylimidazolium tetrafluoroborate (BF₄⁻) and hexafluorophosphate (PF₆⁻). A unique reversible CO₂ occlusion was observed in 1-tetradecyl-3-methylimidazolium tetrafluoroborate (C₁₄mim BF₄) under rapid temperature quench from the liquid phases to the solid phase, while complete desorption occurred upon heating above the melting point (40 °C). In situ wide-angle x-ray scattering revealed that the lamellar structure of C₁₄mim BF₄ liquid crystal phases provides a high concentration of dynamically accessible anion and cation interaction sites for CO₂, facilitating CO₂ occlusion upon rapid solidification. The selective occlusion of CO₂ in C₁₄mim BF₄ suggests a new mechanism for CO₂ sorption processes.

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咪唑离子液晶对CO2吸附特性的研究

本文以1-烷基-3-甲基咪唑（Cnmim）离子液体家族为基础，对咪唑离子液晶的CO2吸附特性进行了深入的研究。具体来说，研究了1-十四烷基-3-甲基咪唑四氟硼酸盐（BF4−）和六氟磷酸盐（PF6−）在熔融、液晶和各向同性液体转变中的吸附机理。在1-十四烷基-3-甲基咪唑四氟硼酸盐（C14mim BF4）中，在从液相到固相的快速温度淬火下，观察到独特的可逆CO2遮挡，而在加热到熔点（40°C）以上时发生完全解吸。原位广角x射线散射表明，C14mim BF4液晶相的层状结构为CO2提供了高浓度的动态可及的阴离子和阳离子相互作用位点，促进了CO2在快速凝固过程中的闭塞。C14mim BF4对CO2的选择性阻断提示了CO2吸附过程的新机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.