Surface behaviour of 1-alkyl-3-methylimidazolium ionic liquids at the air-water-interface - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Molecular Liquids Année : 2023

Surface behaviour of 1-alkyl-3-methylimidazolium ionic liquids at the air-water-interface

Stephanie Tassler
  • Fonction : Auteur
  • PersonId : 1061198
Tiago Eusebio
  • Fonction : Auteur
Raquel M. Valente
  • Fonction : Auteur
Tomas Rego
  • Fonction : Auteur
  • PersonId : 1061197
Eduardo. J. M. Filipe
  • Fonction : Auteur
  • PersonId : 982036
Michel Goldmann
Philippe Fontaine

Résumé

The ability of 1-alkyl-3-methylimidazolium ionic liquids, [Cnmim][X], to form layers at the air–water interface has been investigated systematically for the first time: five different chain lengths of the cation, n = 12, 14, 16, 18, 20 were studied, combined with three different anions, namely [N(Tf)2]−, [PF6]− and [Cl]−. The results show that only cations with chains longer than n = 16, combined with the [N(Tf)2]− anion form stable monolayers at the air/water interface, allowing measurable surface pressure vs area per molecule (π-A) isotherms immediately after spreading. The films of [C20mim][N(Tf)2] on water have been characterised using Brewster angle microscopy (BAM), Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS), specular X-ray reflectivity (XRR) and grazing incidence X-ray diffraction (GIXD). Additionally, atomistic molecular dynamics simulations were also performed to obtain a molecular level interpretation of the experimental results. The results are compatible with a transition from an expanded monolayer to a trilayer structure, followed by the 3D collapse of the film.

Dates et versions

hal-03958442 , version 1 (26-01-2023)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Stephanie Tassler, Nathalie Bonatout, Tiago Eusebio, Raquel M. Valente, Tomas Rego, et al.. Surface behaviour of 1-alkyl-3-methylimidazolium ionic liquids at the air-water-interface. Journal of Molecular Liquids, 2023, 370, pp.121028. ⟨10.1016/j.molliq.2022.121028⟩. ⟨hal-03958442⟩
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