Investigating the phase diagram-ionic conductivity isotherms relationship in aqueous solutions of strong bases: Lithium, sodium and potassium hydroxides

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2025-03-15 Epub Date: 2025-02-18 DOI:10.1016/j.molliq.2025.127179

Hilal Al-Salih, Yaser Abu-Lebdeh

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Abstract

This study investigates the intricate link between solid–liquid phase diagram features and ionic conductivity in aqueous solutions over a wide concentration range, with a focus on aqueous solutions of strong bases. We examined the ionic conductivity (κ) as influenced by molar fraction (χ) and temperature (T) in three base/water solutions: lithium hydroxide (LiOH), sodium hydroxide (NaOH), and potassium hydroxide (KOH), including analysis of their binary phase diagrams. We established an outstanding connection between phase diagram key features and ionic conductivity isotherms trends particularly at the eutectic mole fraction composition, similar to what has been shown with non-aqueous electrolyte solutions and aqueous solutions of nitrates and acids. Data on ionic conductivity at various temperatures were sourced from existing literature and analyzed using a semi-empirical equation (κ = f (χ, T)) recently proposed by our research group. This research not only demonstrates the correlation between phase diagram features and conductivity isotherms but also indicates the potential for wider applicability of our semi-empirical model. Our findings contribute to a deeper understanding of the complex relationship between structural properties and ionic transport in a range of acidic aqueous solutions.

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研究强碱水溶液中的相图-离子导电等温线关系：锂、钠和钾氢氧化物

本研究探讨了广泛浓度范围内水溶液中固液相图特征与离子电导率之间的复杂联系，重点研究了强碱水溶液。我们研究了氢氧化锂（LiOH）、氢氧化钠（NaOH）和氢氧化钾（KOH）三种碱/水溶液中离子电导率（κ）受摩尔分数（χ）和温度(T)的影响，并分析了它们的二元相图。我们在相图关键特征和离子电导率等温线趋势之间建立了一个突出的联系，特别是在共晶摩尔分数组成中，类似于非水电解质溶液和硝酸盐和酸的水溶液。不同温度下离子电导率的数据来源于现有文献，并使用我们研究小组最近提出的半经验方程（κ = f (χ， T)）进行分析。这项研究不仅证明了相图特征与电导率等温线之间的相关性，而且表明了我们的半经验模型具有更广泛适用性的潜力。我们的发现有助于更深入地理解一系列酸性水溶液中结构性质和离子传输之间的复杂关系。

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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.