High-pressure-driven glass transitions of ionic liquids: 1-alkyl-3-methylimidazolium iodide

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-09-30 DOI:10.1016/j.molliq.2025.128598

Hiroshi Abe , Shusei Maruyama , Yuto Yoshiichi , Akihisa Aimi , Hiroaki Kishimura , Kosuke Kaneko , Tomonori Hanasaki

引用次数: 0

Abstract

High-pressure (HP) glass transitions of ionic liquids (ILs) were examined using Raman spectroscopy and small- and wide-angle X-ray scattering. The ILs were 1-alkyl-3-methylimidazolium iodide [C_nmim]I (n = 6 and 8). At ambient pressure, a distinct prepeak derived from nanoheterogeneity appeared in [C₆mim]I and [C₈mim]I. In [C₆mim]I, the prepeak disappeared during the superpressurized liquid state, and a homogeneous glass was formed under HP. The nanoheterogeneity in [C₈mim]I did not collapse even at the glass transition pressure (∼3 GPa). HP heterogeneous glass was induced in [C₈mim]I, which had a longer alkyl chain. At around 8 GPa, the heterogeneous glass changed to the full homogeneous glass in [C₈mim]I with the change in the local structure.

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高压驱动离子液体的玻璃化转变：1-烷基-3-甲基咪唑碘化

利用拉曼光谱和小角和广角x射线散射研究了离子液体（ILs）的高压玻璃化跃迁。il分别为1-烷基-3-甲基咪唑碘化[Cnmim]I （n = 6和8）。在环境压力下，[C6mim]I和[C8mim]I出现了由纳米非均质性引起的明显的预峰。在[C6mim]I中，预峰在超压液态下消失，在高压下形成均匀玻璃。[C8mim]I中的纳米非均质性即使在玻璃化转变压力（~ 3gpa）下也没有坍塌。在具有较长烷基链的[C8mim]I中诱导出HP非均相玻璃。在8gpa左右，随着局部结构的改变，非均质玻璃在[C8mim]I中变为全均质玻璃。

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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.