Structural optimization and characterization of fluoro-based protic ionic liquids for high-temperature and high-salinity conditions

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-05-26 DOI:10.1016/j.molliq.2025.127820

Masooma Nazar, Muhammad Israr, Ahmad Mahboob, Syed Muhammad Shakil Hussain, Muhammad Shahzad Kamal

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引用次数: 0

Abstract

Fluorine-based protic ionic liquids (FILs) have unique chemical and structural properties that make them attractive in applications that involve harsh conditions like high temperature and high salinity. In this study, we synthesized the seven FILs with primary amines having varied alkyl chain lengths. The chemical structure was confirmed by NMR, and FTIR spectroscopy. The thermal stability of the FILs was evaluated by the thermogravimetric analyzer (TGA). Additionally, the surface properties and thermodynamic parameters of the three most important FILs were also examined in this study. The long-term thermal and salt tolerance test was performed for three different types of water with having salinity range from 0 to 241,000 ppm. The results showed that the degradation temperature of all synthesized FILs was higher than the reservoir temperature. The surface-activity findings demonstrated that FILs with the alkyl chain range from (C₆-C₁₂) have excellent surface properties. However shorter chain (C₂-C₄) showed very little surface reduction, and the longer chain (C₁₄-C₁₆) faced solubility issues, which hindered the determination of their surface tension. The salt tolerance results provide stable and transparent solutions after one week of ageing at 90 °C. These findings exhibited the importance of the molecular structure of the FILs with their desired properties for the application at high temperature and high salinity conditions.

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高温高盐度条件下氟基质子离子液体的结构优化与表征

氟基质子离子液体（FILs）具有独特的化学和结构特性，使其在涉及高温和高盐度等恶劣条件的应用中具有吸引力。在这项研究中，我们合成了7个具有不同烷基链长的伯胺的FILs。化学结构经核磁共振、红外光谱确证。用热重分析仪（TGA）评价了FILs的热稳定性。此外，本研究还研究了三种最重要的FILs的表面性质和热力学参数。对三种不同类型的水进行了长期耐温耐盐测试，其盐度范围从0到241,000 ppm。结果表明，所有合成FILs的降解温度均高于储层温度。表面活性结果表明，具有（C6-C12）烷基链的FILs具有优异的表面性能。然而，较短的链（C2-C4）表面还原很小，而较长的链（C14-C16）面临溶解度问题，这阻碍了它们表面张力的测定。耐盐性结果在90°C陈化一周后提供稳定透明的溶液。这些发现显示了FILs的分子结构及其在高温和高盐度条件下的应用所期望的性能的重要性。

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.