Linking dynamics and structure in highly asymmetric ionic liquids

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Abstract
We explore an idealized theoretical model for ion transport within highly asymmetric ionic liquid mixtures. A primitive model-inspired system serves as a representative for asymmetric ionic materials (such as liquid crystalline salts) which quench to form disordered, partially arrested phases. Self-consistent generalized Langevin equation theory is applied to understand the connection between the size ratio of charge-matched salts and their average mobility. Within this model, we identify novel glassy states where one of the two charged species (without loss of generality, either the macro-cation or the micro-anion) is arrested, while the other retains liquid-like mobility. We discuss how this result is useful in the development of novel single-ion conducting phases in ionic liquid-based materials, for instance, conductors operating at low temperature or the technology associated with ionic liquid crystals.
Funding Information
  • Consejo Nacional de Humanidades, Ciencias y Tecnologías (IxM No. 1631)
  • Consejo Nacional de Humanidades, Ciencias y Tecnologías (CF-2023-I-1013)
  • Consejo Nacional de Humanidades, Ciencias y Tecnologías (IxM No. 7119)

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