# Switching the structural force in ionic liquid-solvent mixtures by varying composition

## TL;DR

This study investigates how the structural forces in ionic liquid-solvent mixtures can be controlled by changing composition, revealing a switch in dominant length scales from solvent molecules to ion pairs at a specific concentration.

## Contribution

It demonstrates a compositional threshold that switches the dominant structural wavelength from solvent size to ion pair size in ionic liquid-solvent mixtures.

## Key findings

- Abrupt increase in wavelength at a threshold ion concentration
- Wavelength determined by solvent size below threshold
- Wavelength determined by ion pair size above threshold

## Abstract

The structure and interactions in electrolytes at high concentration have implications from energy storage to biomolecular interactions. However many experimental observations are yet to be explained in these mixtures, which are far beyond the regime of validity of mean field models. Here, we study the structural forces in a mixture of ionic liquid and solvent that is miscible in all proportions at room temperature. Using the surface force balance to measure the force between macroscopic smooth surfaces across the liquid mixtures, we uncover an abrupt increase in the wavelength above a threshold ion concentration. Below the threshold concentration the wavelength is determined by the size of the solvent molecule, whereas above the threshold it is the diameter of a cation-anion pair that determines the wavelength.