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UMR 5672

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You are here: Home / Seminars / Experimental physics and modelling / Interfacial structure of a long chain ionic liquid

Interfacial structure of a long chain ionic liquid

Audrey Steinberger (CNRS, LPENSL)
When Sep 19, 2023
from 11:00 to 12:00
Where Salle des conseils
Attendees Audrey Steinberger
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Ionic liquids are molten salts at ambient temperature. They display a wide variety of physico-chemical properties, depending on their ionic composition. They have found numerous applications as solvents, as lubricants, and as electrolytes. The structure adopted by the ionic liquid at the interface with a solid substrate has a large impact on the performance of many processes and devices. However, it is still poorly understood. One part of the challenge comes from the fact that the interactions between the ions, and between the ions and the substrate, often go beyond Coulombian and steric interactions. For example, ions functionalized with a long alkyl chain display an amphiphilic behaviour that leads to a bulk nanostructuration into polar and apolar domains. What becomes that nanostructuration close to a solid substrate?

We have studied the interfacial structure of an ionic liquid with a long-chain imidazolium cation by combining atomic force microscopy experiments and molecular dynamics simulations. In this talk, after introducing the scientific context in more detail, I will explain our methods and discuss our results.