Abstract
Films from aqueous gelatin solutions following the addition of several types of ionic liquids were studied. The water was allowed to evaporate until the films reached their final steady condition, while the ionic liquids remained in the matrix structure because of their negligible vapor pressure. Transversal and longitudinal relaxation times and diffusion coefficient were determined with the help of a single-sided mobile nuclear magnetic resonance scanner. Conductivity measurements were performed in addition. The results reveal different dynamics of the ionic liquids under confinement in the gelatin film porous matrix. The films become rigid and opaque using anions containing Fluor, while they are more flexible and semitransparent, when dicyanimide anion is used. The effect of the geometrical restrictions of the gel matrix on the dynamics of the solvent is more pronounced for the case of the flexible films, while the conductivity remains close to the bulk.
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