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Integrative studies of ionic liquid interface layers: bridging experiments, theoretical models and simulations
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Number of Authors: 82024 (English)In: Nanoscale Horizons, ISSN 2055-6764, E-ISSN 2055-6756Article, review/survey (Refereed) Epub ahead of print
Abstract [en]

Ionic liquids (ILs) are a class of salts existing in the liquid state below 100 degrees C, possessing low volatility, high thermal stability as well as many highly attractive solvent and electrochemical capabilities, etc., making them highly tunable for a great variety of applications, such as lubricants, electrolytes, and soft functional materials. In many applications, ILs are first either physi- or chemisorbed on a solid surface to successively create more functional materials. The functions of ILs at solid surfaces can differ considerably from those of bulk ILs, mainly due to distinct interfacial layers with tunable structures resulting in new ionic liquid interface layer properties and enhanced performance. Due to an almost infinite number of possible combinations among the cations and anions to form ILs, the diversity of various solid surfaces, as well as different external conditions and stimuli, a detailed molecular-level understanding of their structure-property relationship is of utmost significance for a judicious design of IL-solid interfaces with appropriate properties for task-specific applications. Many experimental techniques, such as atomic force microscopy, surface force apparatus, and so on, have been used for studying the ion structuring of the IL interface layer. Molecular Dynamics simulations have been widely used to investigate the microscopic behavior of the IL interface layer. To interpret and clarify the IL structure and dynamics as well as to predict their properties, it is always beneficial to combine both experiments and simulations as close as possible. In another theoretical model development to bridge the structure and properties of the IL interface layer with performance, thermodynamic prediction & property modeling has been demonstrated as an effective tool to add the properties and function of the studied nanomaterials. Herein, we present recent findings from applying the multiscale triangle experiment-simulation-thermodynamic modeling in the studies of ion structuring of ILs in the vicinity of solid surfaces, as well as how it qualitatively and quantitatively correlates to the overall ILs properties, performance, and function. We introduce the most common techniques behind experiment-simulation-thermodynamic modeling and how they are applied for studying the IL interface layer structuring, and we highlight the possibilities of the IL interface layer structuring in applications such as lubrication and energy storage. Integrative experiment-simulation-thermodynamic modeling is highly demanded for qualitatively and quantitatively correlating the ionic liquids interface layer structuring to the overall properties, performance, and function.

Place, publisher, year, edition, pages
2024.
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Biomaterials Science
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URN: urn:nbn:se:su:diva-226961DOI: 10.1039/d4nh00007bISI: 001162334600001PubMedID: 38356335OAI: oai:DiVA.org:su-226961DiVA, id: diva2:1841646
Available from: 2024-02-29 Created: 2024-02-29 Last updated: 2024-02-29

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Laaksonen, Aatto

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