Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]+[TCM] in Silica Material SBA-15 Using NMR

Lydia Gkoura, Nikolaos Panopoulos, Marina Karagianni, George Romanos, Aris Chatzichristos, George Papavassiliou, Jamal Hassan, Michael Fardis

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid [BMIM]+[TCM] confined in SBA-15 mesoporous silica were examined using 1H NMR spin-lattice (T1) relaxation and diffusion measurements. An extensive temperature range (100 K–400 K) was considered in order to study both the liquid and glassy states. The hydrogen dynamics in the two states and the self-diffusion coefficients of the cation [BMIM]+ above the glass transition temperature were extracted from the experimental data. The results were then compared to the corresponding bulk substance. The effects of confinement on the dynamic properties of the ionic liquid clearly manifest themselves in both temperature regimes. In the high-temperature liquid state, the mobility of the confined cations reduces significantly compared to the bulk; interestingly, confinement drives the ionic liquid to the glassy state at a higher temperature Tg than the bulk ionic liquid, whereas an unusual T1 temperature dependence is observed in the high-temperature regime, assigned to the interaction of the ionic liquid with the silica-OH species.

    Original languageBritish English
    Article number6739
    JournalInternational Journal of Molecular Sciences
    Volume24
    Issue number7
    DOIs
    StatePublished - Apr 2023

    Keywords

    • confined ionic liquids
    • mesoporous silica SBA-15
    • NMR
    • relaxation and diffusion

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